ORCID Profile
0000-0001-6132-527X
Current Organisations
Bahauddin Zakariya University
,
Justus Liebig University Giessen Germany
,
University of Otago
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Publisher: Elsevier BV
Date: 12-2021
Publisher: The Royal Society
Date: 05-2023
Abstract: Detached buoyant kelp can disperse thousands of kilometres at sea and can colonize newly available shores in the wake of disturbances that wipe out competitors. Localized earthquake uplift can cause extirpation of intertidal kelp populations followed by recolonization. Sources of recolonizing kelp can be detectable in genomic structure of contemporary populations. Our field observations combined with LiDAR mapping identified a previously unrecognized zone of uplifted rocky coastline in a region that is slowly subsiding. Intertidal kelp ( Durvillaea antarctica ) on the uplifted section of coast is genetically distinctive from nearby populations, with genomic signatures most similar to that of kelp 300 km to the south. Genetic ergence between these locations suggests reproductive isolation for thousands of years. Combined geological and genetic data suggest that this uplift event occurred during one of four major earthquakes between 6000 and 2000 years ago, with one of the younger events most likely. Extirpation of the pre-existing kelp required sudden uplift of approximately 2 metres, precluding several small incremental uplift events. Our results show the power of integrating biological (genomic) analyses with geological data to understand ancient geological processes and their ecological impacts.
Publisher: Cold Spring Harbor Laboratory
Date: 05-07-2022
DOI: 10.1101/2022.07.04.498769
Abstract: Freshwater fish radiations are often characterized by multiple closely-related species in close proximity, which can lead to introgression and associated discordance of mitochondrial and nuclear characterizations of species ersity. As a case in point, single locus nuclear versus mitochondrial analyses of New Zealand’s stream-resident Galaxias vulgaris complex have yielded conflicting phylogenies. We generate and analyze a genome-wide data set comprising 52,352 SNPs across 187 Galaxias specimens to resolve the phylogeny of this recent fish radiation. We conduct phylogenetic, PCA, STRUCTURE, and ABBA-BABA analyses to evaluate the evolutionary relationships of lineages in the context of natural and anthropogenic river drainage alterations. In addition to the 11 previously recognized stream-resident lineages, genome-wide data reveal a twelfth candidate species ( G . ‘Pomahaka’), apparently obscured by introgressive mitochondrial capture. We identify additional ex les of mito-nuclear discordance and putative mitochondrial capture, likely mediated by geological and anthropogenic modification of drainage boundaries. Our study highlights the need for genome-wide approaches for delimiting freshwater bio ersity. Genetic data also reveal the influence of drainage history on freshwater bio ersity, including the rapid ergence of recently fragmented fish populations, and the conservation genetic risks of anthropogenic translocations events.
Publisher: Wiley
Date: 26-05-2021
DOI: 10.1111/JPY.13179
Abstract: Understanding the forces that shape species distributions is increasingly important in a fast‐changing world. Although major disturbance events can adversely affect natural populations, they can also present new opportunities, for ex le by opening up habitat for colonization by other lineages. Following extensive geographic s ling, we use genomic data to infer a range extension following disturbance for an ecologically important intertidal macroalgal species. Specifically, we genotyped 288 southern bull kelp ( Durvillaea ) plants from 28 localities across central New Zealand. All specimens from the North Island were expected to be D. antarctica , but unexpectedly 10 s les from four sites were identified as D. poha . Extensive s ling from the northern South Island (105 s les at five locations) confirmed the absence of D. poha north of the Kaikōura Peninsula. The North Island specimens of D. poha therefore reveal a biogeographic disjunction, some 150 km northeast of the nearest (South Island) population of this species. Based on strong geographic correspondence between these North Island s les and historic disturbance, we infer that tectonic upheaval, particularly earthquake‐generated landslides, likely extirpated local D. antarctica and created an opportunity for a northward range expansion event by D. poha . Close phylogenomic relationships between this new North Island population and South Island s les support a geologically recent northward expansion, rather than a deeper evolutionary origin. These findings indicate the potential of large‐scale disturbances to facilitate sudden biogeographic range expansions, and they emphasize the ability of genomic analyses with fine‐scale s ling to reveal long‐lasting signatures of past disturbance, dispersal, and colonization.
Publisher: Springer Science and Business Media LLC
Date: 04-01-2018
DOI: 10.1007/S10653-017-0043-2
Abstract: Unfortunately, in the original publication of the article, Prof. Yang Sik Ok's affiliation was incorrectly published. The author's affiliation is as follows.
Publisher: Springer Science and Business Media LLC
Date: 26-06-2017
DOI: 10.1007/S10653-017-9998-2
Abstract: Urban agricultural soils are highly variable, and careful selection of sensitive indicators is needed for the assessment of soil quality. This study is proposed to develop an index based on soil enzyme activities for assessing the quality of urban agricultural soils. Top soils were collected from urban agricultural areas of Korea, and soil chemical properties, texture, microbial fatty acids, and enzyme activities were determined. The soils belonged to five textural classes with the highest frequency of sandy loam. There was no clear correlation between the soil chemical properties and soil microbial properties. Principal component analysis (PCA) and factor analysis were applied to microbial groups for identification of microbial community variation in soils. Two soil groups, namely group 1 (G1) and group 2 (G2), based on microbial community abundance were examined by PCA, and those were more prominent in factor analysis. The G1 soils showed higher microbial community abundance than G2 soils. The canonical discriminant analysis was applied to the enzyme activities of sandy loam soil to develop an index, and the index validation was confirmed using the unused soils and published data. The high-quality soils in published literature assigned the high valued index. Microbial fatty acids and soil enzyme activities can be suitable indicators for soil quality evaluation of urban agricultural soils.
Publisher: Elsevier BV
Date: 07-2020
Start Date: 2019
End Date: 2022
Funder: Marsden Fund
View Funded Activity