ORCID Profile
0000-0003-2081-9120
Current Organisation
James Cook University
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Marine and Estuarine Ecology (incl. Marine Ichthyology) | Environmental Science and Management | Other Biological Sciences | Global Change Biology | Environmental Impact Assessment | Environmental Rehabilitation (excl. Bioremediation) | Natural Resource Management | Land And Parks Management |
Atmospheric composition | Living resources (incl. impacts of fishing on non-target species) | Land and water management | Integrated (ecosystem) assessment and management | Rehabilitation of degraded coastal and estuarine areas
Publisher: Elsevier BV
Date: 2005
DOI: 10.1016/J.MARPOLBUL.2004.10.045
Abstract: Low concentrations of herbicides (up to 70 ng l(-1)), chiefly diuron (up to 50 ng l(-1)) were detected in surface waters associated with inter-tidal seagrass meadows of Zostera muelleri in Hervey Bay, south-east Queensland, Australia. Diuron and atrazine (up to 1.1 ng g(-1) dry weight of sediment) were detected in the sediments of these seagrass meadows. Concentration of the herbicides diuron, simazine and atrazine increased in surface waters associated with seagrass meadows during moderate river flow events indicating herbicides were washed from the catchment to the marine environment. Maximum herbicide concentration (sum of eight herbicides) in the Mary River during a moderate river flow event was 4260 ng l(-1). No photosynthetic stress was detected in seagrass in this study during low river flow. However, with moderate river flow events, nearshore seagrasses are at risk of being exposed to concentrations of herbicides that are known to inhibit photosynthesis.
Publisher: Elsevier BV
Date: 08-2008
Publisher: Elsevier BV
Date: 11-2002
DOI: 10.1016/S0025-326X(02)00221-7
Abstract: A correlation between petroleum hydrocarbon concentrations in sediments and chlorophyll-deficient mutations in mangroves may occur also in Australian mangroves. Earlier reports of such mutations in the Caribbean area were evident in viviparous propagules of the common mangrove genera, Rhizophora, borne on otherwise normal trees. These mutant propagules were termed albinos' since they lacked chlorophyll and normal green coloration, leaving them white, yellow or red. The mutation was considered lethal since newly established albino seedlings appeared unable to survive more than a few months. Our preliminary investigation of mangroves in SE Queensland found a similar mutation in another common mangrove genus, Avicennia, and this was apparently also correlated with oil concentrations in sediments. Although, more evidence is required, an apparently similar relationship shows that whatever caused the mutations may act commonly across a erse range of plant types in quite separate locations. How widespread might this mutation be in mangroves? How many genera and species are affected? Are all occurrences correlated with oil in sediments? Does oil cause the mutation? We discuss these important questions and the potentially serious implications to coastal management where high mutant densities may be indicative of longer term genetic deterioration of mangrove habitat in oil-polluted wetland environments.
Publisher: CSIRO Publishing
Date: 1981
DOI: 10.1071/BT9810135
Abstract: A tropical mangrove species of Diospyros (provisionally identified as D. ferrea var. geminata) possesses well marked growth rings. Their anatomical features are described, and their frequency is compared with rainfall records. Correlation techniques are used to show that the rings are not annual the results suggest that, on average, the tree produces seven rings in 4 years. Regression analysis suggests that the tree produced 0.272 mm2 growth increment per millimetre of rain in the preceding year.
Publisher: Elsevier BV
Date: 11-1990
Publisher: Springer Science and Business Media LLC
Date: 30-05-2023
DOI: 10.1038/S43247-023-00852-Z
Abstract: Mangroves of the wet-dry tropical Gulf of Carpentaria, Australia, survive in a harsh environment. One of the worst recorded mangrove dieback events occurred during the El Niño of 2015 following an extreme, two-year sea level drop, illustrating that enhanced climate variability can exacerbate major stressors for these ecosystems. As well as sea level variability, maximum daily temperatures in the Gulf of Carpentaria are also linked to climate variability and change, and may play an important role in overall mangrove health. Here we address how these two factors: sea level variability and maximum daily temperatures, are projected to change under several future emissions scenarios. Climate projections from the sixth generation of Coupled Model Intercomparison Project indicate an increased occurrence of anomalously low and high sea level events in the coming century. This, alongside enhanced temperature stress, is likely to significantly increase risk to mangrove health in this region. The rate of increase of low and high sea level events, and high temperature events, is scenario-dependent, and is largest for a high-emissions scenario.
Publisher: Elsevier BV
Date: 04-2008
Publisher: Springer Science and Business Media LLC
Date: 10-1990
DOI: 10.1007/BF01314339
Publisher: Public Library of Science (PLoS)
Date: 07-10-2016
Publisher: Springer Science and Business Media LLC
Date: 29-07-2017
Publisher: Springer Science and Business Media LLC
Date: 1995
DOI: 10.1007/BF00029124
Publisher: Springer Science and Business Media LLC
Date: 10-12-2017
Publisher: Wiley
Date: 03-1987
Publisher: Elsevier BV
Date: 2005
DOI: 10.1016/J.MARPOLBUL.2004.10.040
Abstract: Herbicides, particularly diuron, were correlated with severe and widespread dieback of the dominant mangrove, Avicennia marina (Forsk.) Vierh. var. eucalyptifolia (Val.) N.C. Duke (Avicenniaceae), its reduced canopy condition, and declines in seedling health within three neighbouring estuaries in the Mackay region of NE Australia. This unusual species-specific dieback, first observed in the early 1990s, had gotten notably worse by 2002 to affect >30 km(2) of mangroves in at least five adjacent estuaries in the region. Over the past century, agricultural production has responded well to the demands of increasing population with improvements in farm efficiency assisted by significant increases in the use of agricultural chemicals. However, with regular and episodic river flow events, these chemicals have sometimes found their way into estuarine and nearshore water and sediments where their effects on marine habitats have been largely unquantified. Investigations over the last three years in the Mackay region provide compelling evidence of diuron, and possibly other agricultural herbicides, as the most likely cause of the severe and widespread mangrove dieback. The likely consequences of such dieback included declines in coastal water quality with increased turbidity, nutrients and sediment deposition, as well as further dispersal of the toxic chemicals. The implications of such findings are immense since they describe not only the serious deterioration of protected and beneficial mangrove habitat but also the potential for significant direct and indirect effects on other highly-valued estuarine and marine habitats in the region, including seagrass beds and coral reefs of the Great Barrier Reef lagoon. This article reviews all key findings and observations to date and describes the essential correlative and causative evidence.
Publisher: Springer Science and Business Media LLC
Date: 28-04-2022
DOI: 10.1038/S41559-022-01744-9
Abstract: Genomic studies are now poised to explore whole communities of species. The ~70 species of woody plants that anchor the coastal ecosystems of the tropics, collectively referred to as mangroves, are particularly suited to this exploration. In this study, we de novo sequenced the whole genomes of 32 mangroves, which we combined with other sequences of 30 additional species, comprising almost all mangroves globally. These community-wide genomic data will be valuable for ecology, evolution and bio ersity research. While the data revealed 27 independent origins of mangroves, the total phylogeny shows only modest increases in species number, even in coastal areas of active speciation, suggesting that mangrove extinction is common. A possible explanation for common extinction is the frequent sea-level rises and falls (SLRs and SLFs) documented in the geological record. Indeed, near-extinctions of species with extremely small population size (N) often happened during periods of rapid SLR, as revealed by the genome-wide heterozygosity of almost all mangroves. Reduction in N has possibly been further compounded by population fragmentation and the subsequent accumulation of deleterious mutations, thus pushing mangroves even closer to extinction. Crucially, the impact of the next SLR will be exacerbated by human encroachment into these mangrove habitats, potentially altering the ecosystems of tropical coasts irreversibly.
Publisher: Frontiers Media SA
Date: 30-09-2016
Publisher: CSIRO Publishing
Date: 1991
DOI: 10.1071/SB9910299
Abstract: In Australasia (including Australia, New Zealand, New Guinea and other islands in the south-western Pacific) the mangrove genus Avicennia L. consists of five species: A. alba Bl., A. integra N. C. Duke, A. marina (Forsk.) Vierh., A. oficinalis L. and A. rumphiana Hallier f. Based on morphological characters and supported by allele patterns in isozyme studies (reported elsewhere), A. marina is ided into three varieties. Keys, descriptions, brief synonymy, descriptive figures and distribution maps are provided for each of the seven taxa.* Aust. Inst. Marine Sci. Contrib. No. 520.
Publisher: Elsevier BV
Date: 2000
Publisher: Springer Science and Business Media LLC
Date: 10-1987
DOI: 10.1007/BF00427019
Publisher: Springer Science and Business Media LLC
Date: 17-04-2014
Publisher: Elsevier BV
Date: 08-2016
DOI: 10.1016/J.MARPOLBUL.2016.06.082
Abstract: Mangrove tidal wetland habitats are recognised as highly vulnerable to large and chronic oil spills. This review of current literature and public databases covers the last 6 decades, summarising global data on oil spill incidents affecting, or likely to have affected, mangrove habitat. Over this period, there have been at least 238 notable oil spills along mangrove shorelines worldwide. In total, at least 5.5milliontonnes of oil has been released into mangrove-lined, coastal waters, oiling possibly up to around 1.94millionha of mangrove habitat, and killing at least 126,000ha of mangrove vegetation since 1958. However, there were assessment limitations with incomplete and unavailable data, as well as unequal coverage across world regions. To redress the gaps described here in reporting on oil spill impacts on mangroves and their recovery worldwide, a number of recommendations and suggestions are made for refreshing and updating standard operational procedures for responders, managers and researchers alike.
Publisher: Public Library of Science (PLoS)
Date: 08-2022
DOI: 10.1371/JOURNAL.PCLM.0000037
Abstract: Recent ENSO-related, extreme low oscillations in mean sea level, referred to as ‘Taimasa’ in Samoa, have destabilised shoreline mangroves of tropical northern Australia, and possibly elsewhere. In 1982 and 2015, two catastrophic Taimasa each resulted in widespread mass dieback of ~76 km 2 of shoreline mangroves along 2,000 km of Australia’s Gulf of Carpentaria. For the 2015 event, we determined that a temporary drop in sea level of ~0.4 metres for up to six months duration caused upper zone shoreline mangroves across the region to die from severe moisture deficit and desiccation. The two dramatic collapse events revealed a previously unrecognised vulnerability of semi-arid tidal wetland habitats to more extreme ENSO influences on sea level. In addition, we also observed a relationship between annual sea level oscillations and mangrove forest productivity where seasonal oscillations in mean sea level were co-incident with regular annual mangrove leaf growth during months of higher sea levels (March-May), and leaf shedding during lower sea levels (September-November). The combination of these periodic fluctuations in sea level defined a mangrove ‘Goldilocks’ zone of seasonal productivity during median-scale oscillations, bracketed by critical threshold events when sea levels became unusually low, or high. On the two occasions reported here when sea levels were extremely low, upper zone mangrove vegetation died en masse in synchrony across northern Australia. Such extreme pulse impacts combined with localised stressors profoundly threaten the longer-term survival of mangrove ecosystems and their benefits, like minimisation of shoreline erosion with rising sea levels. These new insights into such critical influences of climate and sea level on mangrove forests offer further affirmation of the urgency for implementing well-considered mitigation efforts for the protection of shoreline mangroves at risk, especially given predictions of future re-occurrences of extreme events affecting sea levels, combined with on-going pressure of rapidly rising sea levels.
Publisher: Elsevier BV
Date: 2000
Publisher: Naturalis Biodiversity Center
Date: 29-04-2011
Publisher: Springer Science and Business Media LLC
Date: 07-08-2013
Publisher: Elsevier BV
Date: 10-2016
Publisher: American Geophysical Union (AGU)
Date: 09-05-2008
DOI: 10.1029/2007GB003052
Publisher: Springer Science and Business Media LLC
Date: 07-10-2007
Publisher: Naturalis Biodiversity Center
Date: 2018
Publisher: Springer Science and Business Media LLC
Date: 10-12-2013
Publisher: CSIRO Publishing
Date: 1994
DOI: 10.1071/SB9940521
Abstract: The putative hybrid tree taxon, Sonneratia alba x S. lanceolata, previously reported for two incomplete herbarium specimens from northern Australia and south-east West Irian, has since been observed and collected in mangrove forests of southern Papua New Guinea. It is morphologically uniform and is described as S. xurama. Notes on its floral phenology, distribution and ecology are given, including a key to all major Sonneratia taxa in this region.
Publisher: No publisher found
Date: 2000
Publisher: CSIRO Publishing
Date: 1988
DOI: 10.1071/SB9880177
Abstract: This taxon was recognised in Australian mangrove assemblages as Avicennia oficinalis L., which is commonly found in Indo-Malesia and southern New Guinea. However, it is morphologically distinct, and the major distinguishing character of entire margins for calyx and bracts is unique in the genus. This species, described here as A. integra, occurs only in the Northern Territory of Australia. It therefore has the dual distinction for an Australian mangrove species of not only being endemic, but also being absent from the floristically rich tidal forests of north-eastern Queensland. Notes on its floral phenology, distribution and ecology are also given.* Aust. Inst. Marine Sci. Contrib. No. 417.
Publisher: CSIRO Publishing
Date: 1984
DOI: 10.1071/BT9840087
Abstract: The mangrove forests of north-eastern Australia are both species-rich and well developed but there is very little information available on their vegetative growth or flowering and fruiting behaviour. This account attempts to rectify this situation by presenting the results of at least 4 years of field studies and observations. Previous reports recorded no less than 35 mangrove species occumng along the north-eastern coast and observations of the flowering and fruiting status of all these species were made. The results are supported by some litter fall studies and overall they reflect the ersity of mangrove species by displaying a range of peak activity months. However, there are some common trends and most species flower mainly during the dry hot summer (September-December) prior to the rainy season when they drop their propaguies during the morniks of peak rainfall (around February). Detailed studies of litter fall were camed out in Missionary Bay, Hinchinbrook Island (18° 16̸2S.,146° 13̸2E.), and care was taken to record components of floral development and vegetative growth. The results for five species (Rhizophora apiculata, R. stylosa, R. × lamarckii, Bruguiera gymnorhiza and Ceriops tagal var. tagal) include estimates of mean leaf longevity and also suggest that the floral and vegetative cycles are coordinated.
Publisher: Elsevier
Date: 2002
Publisher: CSIRO Publishing
Date: 2017
DOI: 10.1071/MF16322
Abstract: This study records and documents the most severe and notable instance ever reported of sudden and widespread dieback of mangrove vegetation. Between late 2015 and early 2016, extensive areas of mangrove tidal wetland vegetation died back along 1000km of the shoreline of Australia’s remote Gulf of Carpentaria. The cause is not fully explained, but the timing was coincident with an extreme weather event notably one of high temperatures and low precipitation lacking storm winds. The dieback was severe and widespread, affecting more than 7400ha or 6% of mangrove vegetation in the affected area from Roper River estuary in the Northern Territory, east to Karumba in Queensland. At the time, there was an unusually lengthy period of severe drought conditions, unprecedented high temperatures and a temporary drop in sea level. Although consequential moisture stress appears to have contributed to the cause, this occurrence was further coincidental with heat-stressed coral bleaching. This article describes the effect and diagnostic features of this severe dieback event in the Gulf, and considers potential causal factors.
Publisher: Springer Berlin Heidelberg
Date: 2015
Publisher: Springer Science and Business Media LLC
Date: 10-06-2010
Publisher: CSIRO Publishing
Date: 1990
DOI: 10.1071/SB9900221
Abstract: Morphological variation in flowers, fruit and leaves of five Australasian species of Avicennia was assessed using multivariate techniques. Groupings based on 184 herbarium specimens gathered throughout the region showed no intermediates or potential hybrids between species, A. alba, A. integra, A. rumphiana (= A. lanata), A. marina (= A. eucalyptifolia = A. balanophora) and A. officinalis. The most common and systematically troublesome species, A. marina, was considered further in a regional litter fall survey of 25 Australian sites, and in a detailed field study of eight locations within one estuary. In both studies, morphological variation correlated with environmental factors including air temperature, rainfall, intertidal position and upriver location. Major differences were also observed within in iduals, as shown in sun and shade leaves. These observations suggested that many attributes, especially of leaves, were influenced by environmental factors, demonstrating their unsuitability in earlier systematic treatments. Other attributes reflecting putative subspecific genetic variation, included bark character, extent of pubescence on calyx lobes, and stigma position in relation to anthers. These characterise three groupings of A. marina sites, related to major biogeographic zones within this region: southeastern Australia and New Zealand northern and north-eastern Australia and southern Papua New Guinea and south-western Australia.* Aust. Inst. Marine Sci. Contrib. No. 489.
Publisher: CSIRO Publishing
Date: 1981
DOI: 10.1071/BT9810555
Abstract: Fourier analysis was used to demonstrate distinctive seasonal patterns of leaf litter fall in the mangrove species Rhizophora apiculata, R. stylosa and R. lamarckii. Similar treatment of data for stipule fall was not successful, indicating that this process may be controlled by random events. The fall of leaves and reproductive parts appears to be correlated with climatic factors, notably rainfall, in a fashion that varies with species. Seasonal trends without Fourier analysis are described for Sonneratia alba, Bruguiera gymnorrhiza, B. parviflora, Avicennia sp. and Ceriops tagal in terms of leaves and reproductive parts, and for leaves only in Excoecaria agallocha, Xylocarpus granatum, Heritiera littoralis, Lumnitzera racemosa and L. littorea.
Publisher: Elsevier BV
Date: 2005
DOI: 10.1016/J.MARPOLBUL.2004.10.025
Abstract: Marine plants colonise several interconnected ecosystems in the Great Barrier Reef region including tidal wetlands, seagrass meadows and coral reefs. Water quality in some coastal areas is declining from human activities. Losses of mangrove and other tidal wetland communities are mostly the result of reclamation for coastal development of estuaries, e.g. for residential use, port infrastructure or marina development, and result in river bank destabilisation, deterioration of water clarity and loss of key coastal marine habitat. Coastal seagrass meadows are characterized by small ephemeral species. They are disturbed by increased turbidity after extreme flood events, but generally recover. There is no evidence of an overall seagrass decline or expansion. High nutrient and substrate availability and low grazing pressure on nearshore reefs have lead to changed benthic communities with high macroalgal abundance. Conservation and management of GBR macrophytes and their ecosystems is h ered by scarce ecological knowledge across macrophyte community types.
Publisher: Wiley
Date: 20-04-2016
DOI: 10.1111/JBI.12770
Publisher: Cambridge University Press (CUP)
Date: 22-09-2011
DOI: 10.1017/S0376892911000373
Abstract: Mangroves are an imperilled biome whose protection and restoration through payments for ecosystem services (PES) can contribute to improved livelihoods, climate mitigation and adaptation. Interviews with resource users in three Solomon Islands villages suggest a strong reliance upon mangrove goods for subsistence and cash, particularly for firewood, food and building materials. Village-derived economic data indicates a minimum annual subsistence value from mangroves of US$ 345–1501 per household. Fish and nursery habitat and storm protection were widely recognized and highly valued mangrove ecosystem services. All villagers agreed that mangroves were under threat, with firewood overharvesting considered the primary cause. Multivariate analyses revealed village affiliation and religious denomination as the most important factors determining the use and importance of mangrove goods. These factors, together with gender, affected users’ awareness of ecosystem services. The importance placed on mangrove services did not differ significantly by village, religious denomination, gender, age, income, education or occupation. Mangrove ecosystem surveys are useful as tools for raising community awareness and input prior to design of PES systems. Land tenure and marine property rights, and how this complexity may both complicate and facilitate potential carbon credit programmes in the Pacific, are discussed.
Publisher: Springer Science and Business Media LLC
Date: 2001
Publisher: CSIRO Publishing
Date: 1979
DOI: 10.1071/BT9790657
Abstract: Recent global revisions have failed to resolve difficulties in identification of the Australian Rhizophora. Presented is a field key and detailed specific descriptions of the four species found in the north-east. Classificatory analyses revealed the distinct nature of the entities and some of their associations with each other.
Publisher: Elsevier BV
Date: 08-2016
DOI: 10.1016/J.MARPOLBUL.2016.05.069
Abstract: Climate change with human direct pressures represent significant threats to the resilience of shoreline habitats like mangroves. A rapid, whole-of-system assessment strategy is needed to evaluate such threats, better linking innovative remote sensing with essential on-ground evaluations. Using the Shoreline Video Assessment Method, we surveyed around 190km of the mostly mangrove-fringed (78%) coastline of Kien Giang Province, Vietnam. The aim was to identify anthropogenic drivers of degradation, establishing baseline for specific rehabilitation and protection strategies. Fish traps occupy at least 87% of shoreline mangroves, around which there were abundant human activities - like fishing, crabbing, farming, plus collecting firewood and foliage. Such livelihoods were associated with remnant, fringing mangrove that were largely degraded and threatened by erosion retreat, herbivory, and excessive cutting. Our assessment quantified associated threats to shoreline stability, along with previous rehabilitation intervention measures. The method offers key opportunities for effective conservation and management of vulnerable shoreline habitats.
Publisher: Public Library of Science (PLoS)
Date: 08-04-2010
Publisher: Wiley
Date: 28-11-2017
DOI: 10.1111/GCB.13968
Abstract: The projected increases in sea levels are expected to affect coastal ecosystems. Tropical communities, anchored by mangrove trees and having experienced frequent past sea level changes, appear to be vibrant at present. However, any optimism about the resilience of these ecosystems is premature because the impact of past climate events may not be reflected in the current abundance. To assess the impact of historical sea level changes, we conducted an extensive genetic ersity survey on the Indo‐Malayan coast, a hotspot with a large global mangrove distribution. A survey of 26 populations in six species reveals extremely low genome‐wide nucleotide ersity and hence very small effective population sizes ( N e ) in all populations. Whole‐genome sequencing of three mangrove species further shows the decline in N e to be strongly associated with the speed of past changes in sea level. We also used a recent series of flooding events in Yalong Bay, southern China, to test the robustness of mangroves to sea level changes in relation to their genetic ersity. The events resulted in the death of half of the mangrove trees in this area. Significantly, less genetically erse mangrove species suffered much greater destruction. The dieback was accompanied by a drastic reduction in local invertebrate bio ersity. We thus predict that tropical coastal communities will be seriously endangered as the global sea level rises. Well‐planned coastal development near mangrove forests will be essential to avert this crisis.
Publisher: Oxford University Press (OUP)
Date: 18-04-2011
Abstract: Population genetics of species living in marginal habitats could be particularly informative about the genetics of adaptation, but such analyses have not been readily feasible until recently. Sonneratia alba, a mangrove species widely distributed in the Indo-West Pacific, provides a very suitable system for the study of local adaptation. In this study, we analyzed DNA variation by pooling 71 genes from 85-100 in iduals for DNA sequencing. For each of the two nearby S. alba populations, we obtained ~2,500 × coverage on the Illumina GA platform and for the Sanya population, an additional 5,400 × coverage on the AB SOLiD platform. For the Sanya s le, although each sequencing method called many putative single nucleotide polymorphisms, the two sets of calls did not overlap, suggesting platform-dependent errors. Conventional sequencing corroborated that each population is monomorphic. The two populations differ by 54 bp of 79,000 sites, but 90% of the variants are found in 10% of the genes. Strong local adaptation and high migration may help to explain the extensive monomorphism shared by the two populations in the presence of a small number of highly differentiated loci.
Publisher: Frontiers Media SA
Date: 26-10-2016
Publisher: MDPI AG
Date: 08-12-2020
DOI: 10.3390/RS12244008
Abstract: Around the world, the effects of changing plant phenology are evident in many ways: from earlier and longer growing seasons to altering the relationships between plants and their natural pollinators. Plant phenology is often monitored using satellite images and parametric methods. Parametric methods assume that ecosystems have unimodal phenologies and that the phenology model is invariant through space and time. In evergreen ecosystems such as mangrove forests, these assumptions may not hold true. Here we present a novel, data-driven approach to extract plant phenology from Landsat imagery using Generalized Additive Models (GAMs). Using GAMs, we created models for six different mangrove forests across Australia. In contrast to parametric methods, GAMs let the data define the shape of the phenological curve, hence showing the unique characteristics of each study site. We found that the Enhanced Vegetation Index (EVI) model is related to leaf production rate (from in situ data), leaf gain and net leaf production (from the published literature). We also found that EVI does not respond immediately to leaf gain in most cases, but has a two- to three-month lag. We also identified the start of season and peak growing season dates at our field site. The former occurs between September and October and the latter May and July. The GAMs allowed us to identify dual phenology events in our study sites, indicated by two instances of high EVI and two instances of low EVI values throughout the year. We contribute to a better understanding of mangrove phenology by presenting a data-driven method that allows us to link physical changes of mangrove forests with satellite imagery. In the future, we will use GAMs to (1) relate phenology to environmental variables (e.g., temperature and rainfall) and (2) predict phenological changes.
Publisher: Elsevier BV
Date: 1986
Publisher: Elsevier BV
Date: 09-2006
Publisher: CSIRO Publishing
Date: 1981
DOI: 10.1071/BT9810547
Abstract: Annual totals of the components of litter fall (leaves, reproductive parts, stipules, wood and residual debris) are presented for Rhizophora apiculata, R. lamarckii and R. stylosa as well as for Sonneratia alba, Avicennia sp., Ceriops tagal, Bruguiera gymnorrhiza and B. parviflora from a large number of sites at Hinchinbrook Island (lat. 18°15'S. long. 146°15'E.). Annual total litter fall among all species ranged from 3.8 to 19.6 Mg ha-1. The mean value among the Rhizophora spp., the most extensively s led was 9.6 Mg ha-1 yr-1. Leaves, generally, made up the most important component of all litter materials. The results are compared with records in the literature for tidal as well as non-tidal forests elsewhere in the tropics.
Publisher: CSIRO Publishing
Date: 1988
DOI: 10.1071/BT9880473
Abstract: Litter fall studies were used to assess phenologies and productivity of Sonneratia alba, S. caseolaris and their putative hybrid, S. × Gulngai, in north-eastern Australia. Annual total litter falls (mean ± s.d.) were 2.5 × 0.5, 2.6 × 1.4 and 3.2 g dry weight m-2 day-1, respectively. Litter was partitioned into leaves (47, 61 and 50%), wood (12, 14 and 19%) and reproductive parts (41, 25 and 31%). In addition, monthly reproductive schedules were produced for each taxon. Differences between taxa were pronounced. For S. alba, flowering peaked in December and fruiting in February. For S. caseolaris, flowering peaked in late February and fruiting in June and July. S. × Gulngai was characterised by an apparent combination of events described for the two putative parental forms. This observation, along with a low (a%) fruiting success, provides further support for the hybrid status of this taxon.
Publisher: Naturalis Biodiversity Center
Date: 30-11-2020
DOI: 10.3767/BLUMEA.2020.65.02.04
Abstract: Pelliciera is a genus of mangrove trees with distinct showy flowers with five petals subtended by two large foliaceous bracts. The genus, thought to be monotypic, only containing P. rhizophorae, was classified recently in the small erse family, the Tetrameristaceae . This distinctive genus occurs in a relatively restricted distribution in Central and northern South America in the Atlantic-East Pacific region. In this recent decade, two varietal forms have been reported across its range, of which one appears to be a colour morph referred to much earlier as P. rhizophorae var. benthamii . The taxonomic status of the earlier morph was, however, insufficient to warrant in idual recognition at the time, so the genus remained monotypic with no varietal forms. The aim of this treatment has been to review the systematic history of the genus, to thoroughly re-assess available observations and to re-evaluate the current taxonomic status. In conclusion, the genus is recognised now as having two closely related species, described here as P. benthamii along with a redefined P. rhizophorae . Characters such as leafy bract colour, leaf dentition and petal shape used in their discrimination are provided, along with notes on the ecology, phenology, a diagnostic key, and a revised distribution map that displays the oddly overlapping occurrences.
Publisher: Elsevier BV
Date: 09-2008
Publisher: Elsevier BV
Date: 11-2019
Publisher: Springer Science and Business Media LLC
Date: 11-07-2018
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/MF17116
Abstract: In the present study, we investigated the changes to nekton communities with increasing mangrove forest age and relationships between nekton and the mangrove vegetation, mangrove sediments and environmental variables. The nekton community was assessed as a potential indicator for evaluating habitat functionality of mangrove planting programs. In all, 99 species from 52 families were captured, including crabs, shrimp, squid and fish. The crustacean assemblage was dominated by Portunidae and Penaeidae, whereas the fish assemblage was dominated by Atherinidae, Apogonidae, Hemirh hidae, Tetraodontidae, Congridae, Sphyraenidae, Murraenidae, Ambassidae, Gerreidae, Clupeidae, Platycephalidae, Gobiidae, Mullidae and Plotosidae, with these families accounting for 90% of all in iduals collected. The species composition, abundance and biomass of the nekton community were not significantly correlated with mangrove vegetation and sediment variables, but were significantly associated with environmental variables, particularly proximity to reef and tidal inundation. The lack of correlations suggests that the whole nekton assemblage was not a useful indicator in evaluating the progress of restoring habitat functionality in these planted mangroves. However, a significant interaction with mangrove vegetation was found for non-fish components of the nekton. As such, crustaceans, particularly of the Portunidae and Penaeidae families, were useful indicators for determining the habitat functionality of planted mangroves.
Publisher: Springer Science and Business Media LLC
Date: 1999
Publisher: Wiley
Date: 25-02-2021
DOI: 10.1111/GCB.15539
Abstract: Globally, collapse of ecosystems—potentially irreversible change to ecosystem structure, composition and function—imperils bio ersity, human health and well‐being. We examine the current state and recent trajectories of 19 ecosystems, spanning 58° of latitude across 7.7 M km 2 , from Australia's coral reefs to terrestrial Antarctica. Pressures from global climate change and regional human impacts, occurring as chronic ‘presses’ and/or acute ‘pulses’, drive ecosystem collapse. Ecosystem responses to 5–17 pressures were categorised as four collapse profiles—abrupt, smooth, stepped and fluctuating. The manifestation of widespread ecosystem collapse is a stark warning of the necessity to take action. We present a three‐step assessment and management framework (3As Pathway Awareness , Anticipation and Action ) to aid strategic and effective mitigation to alleviate further degradation to help secure our future.
Publisher: Elsevier BV
Date: 2005
DOI: 10.1016/J.MARPOLBUL.2004.10.051
Abstract: Mangroves are sensitive to the root application of Photosystem II inhibiting herbicides and Avicennia marina is more sensitive than other mangroves tested. Seedlings of four mangrove species, including two salt-excreting species (A. marina and Aegiceras corniculatum) and two salt-excluding species (Rhizophora stylosa and Ceriops australis) were treated with a range of concentrations of the herbicides diuron, ametryn and atrazine. Assessment of responses required the separation of seedlings into two groups: those that had only their roots exposed to the herbicides through the water (A. marina and R. stylosa) and those that had both roots and leaves exposed to herbicides through the water (A. corniculatum and C. australis). Salt-excreting species in each group were more susceptible to all herbicide treatments than salt-excluding species, indicating that root physiology was a major factor in the uptake of toxic pollutants in mangroves. Submergence of leaves appeared to facilitate herbicide uptake, having serious implications for seedling recruitment in the field. Each herbicide was ranked by its toxicity to mangrove seedlings from most damaging to least effective, with diuron>ametryn>atrazine. The relative sensitivity of A. marina found in these pot trials was consistent with the observed sensitivity of this species in the field, notably where severe dieback had specifically affected A. marina in the Mackay region, north eastern Australia.
Publisher: Springer Science and Business Media LLC
Date: 24-11-2001
Publisher: CSIRO Publishing
Date: 2019
DOI: 10.1071/MF18321
Abstract: Mangrove–saltmarsh tidal wetlands are highly dynamic ecosystems, responding and adapting to climate and physical conditions at all spatial and temporal scales. Knowledge of the large-scale ecosystem processes involved and how they might be influenced by climate variables is highly relevant today. For tidal-wetland sites well within the latitudinal range of the mostly tropical mangrove communities, we confirm that average annual rainfall influences vegetative cover, as well as species composition and biomass of tidal wetlands. On the basis of 205 largely unmodified, tropical and subtropical estuaries of northern Australia, a sigmoidal relationship, with a centroid inflection point ~1368mm, was derived between rainfall and the relative amounts of high-biomass mangroves and low-biomass saltmarsh–saltpan vegetation. The presence and probability of observed combinations of these community types were quantified using the wetland cover index, which is the ratio of total mangrove area to that of mangroves plus intertidal saltmarsh and saltpans. Accordingly, periodic changes in rainfall trends are likely manifest as either encroachment or dieback of mangroves along the ecotones separating them from tidal saltmarsh–saltpans. Presented is a new conceptual framework and model that describes how such ecosystem-scale processes take place in tropical and subtropical tidal wetlands.
Publisher: Wiley
Date: 17-08-2010
Publisher: Springer Science and Business Media LLC
Date: 2001
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 05-2013
Publisher: Elsevier BV
Date: 10-1999
Publisher: Cold Spring Harbor Laboratory
Date: 30-04-2019
DOI: 10.1101/622019
Abstract: In the conventional view, species are separate gene pools delineated by reproductive isolation (RI). However, species may also be delineated by merely a small set of “speciation genes” without full RI. It is thus important to know whether “good species” (defined by the “secondary sympatry” test) do continue to exchange genes. Here, we carry out sequencing and de novo high-quality assembly of the genomes of two closely related mangrove species ( Rhizophora mucronata and R. stylosa ). Whole-genome re-sequencing of in iduals across their range on the tropical coasts shows their genomes to be well delineated in allopatry. They became sympatric in northeastern Australia but remain distinct species in contact. Nevertheless, their genomes harbor ∼ 4,000 to 10,000 introgression blocks, each averaging only about 3-4 Kb. These fine-grained introgressions indicate that gene flow has continued long after speciation. Non-introgressable “genomic islets,” averaging only 1.4 Kb, may contribute to speciation as they often harbor erging genes underlying flower development and gamete production. In conclusion, RI needs not be the main criterion of species delineation even though all species would eventually be fully reproductively isolated.
Publisher: Springer Science and Business Media LLC
Date: 18-01-2017
Publisher: Naturalis Biodiversity Center
Date: 10-09-2010
Publisher: Springer Berlin Heidelberg
Date: 2015
Publisher: Elsevier BV
Date: 08-2008
Publisher: Wiley
Date: 23-08-2023
DOI: 10.1002/LOL2.10352
Abstract: The Gulf of Carpentaria and Torres Strait in north‐eastern Australia support globally significant seagrass ecosystems that underpin fishing and cultural heritage of the region. Reliable data on seagrass distribution are critical to understanding how these ecosystems are changing, while managing for resilience. Spatial data on seagrass have been collected since the early 1980s, but the early data were poorly curated. Some was not publicly available, and some already lost. We validated and synthesized historical seagrass spatial data to create a publicly available database. We include a site layer of 48,612 geolocated data points including information on seagrass presence/absence, sediment, collection date, and data custodian. We include a polygon layer with 641 in idual seagrass meadows. Thirteen seagrass species are identified in depths ranging from intertidal to 38 m below mean sea level. Our synthesis includes scientific survey data from 1983 to 2022 and provides an important evidence base for marine resource management.
Start Date: 2003
End Date: 04-2006
Amount: $84,099.00
Funder: Australian Research Council
View Funded ActivityStart Date: 12-2010
End Date: 12-2016
Amount: $120,000.00
Funder: Australian Research Council
View Funded Activity