ORCID Profile
0000-0002-6757-2949
Current Organisations
CSIRO
,
CSIRO National Collection and Marine Infrastructure
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Publisher: National Institute for Health and Care Research
Date: 02-2020
DOI: 10.3310/PHR08020
Abstract: More men than women in the UK are living with overweight or obesity, but men are less likely to engage with weight loss programmes. Healthy Dads, Healthy Kids is an effective Australian weight management programme that targets fathers, who participate with their primary school-aged children. Behavioural interventions do not always transfer between contexts, so an adaptation of the Healthy Dads, Healthy Kids programme to an ethnically erse UK setting was trialled. To adapt and test the Australian Healthy Dads, Healthy Kids programme for delivery to men in an ethnically erse, socioeconomically disadvantaged UK setting. Phase 1a studied the cultural adaptation of the Healthy Dads, Healthy Kids programme and was informed by qualitative data from fathers and other family members, and a theoretical framework. Phase 1b was an uncontrolled feasibility trial. Phase 2 was a randomised controlled feasibility trial. Two ethnically erse, socioeconomically disadvantaged UK cities. In phase 1a, participants were parents and family members from black and minority ethnic groups and/or socioeconomically deprived localities. In phases 1b and 2, participants were fathers with overweight or obesity and their children aged 4–11 years. The adapted Healthy Dads, Healthy Kids intervention comprised nine sessions that targeted diet and physical activity and incorporated joint father–child physical activity. Healthy Dads, Healthy Kids was delivered in two programmes in phase 1b and four programmes in phase 2. Those in the comparator arm in phase 2 received a family voucher to attend a local sports centre. The following outcomes were measured: recruitment to the trial, retention, intervention fidelity, attendance, feasibility of trial processes and collection of outcome data. Forty-three fathers participated (intervention group, n = 29) in phase 2 (48% of recruitment target), despite multiple recruitment locations. Fathers’ mean body mass index was 30.2 kg/m 2 (standard deviation 5.1 kg/m 2 ) 60.2% were from a minority ethnic group, with a high proportion from disadvantaged localities. Twenty-seven (63%) fathers completed follow-up at 3 months. Identifying sites for delivery at a time that was convenient for the families, with appropriately skilled programme facilitators, proved challenging. Four programmes were delivered in leisure centres and community venues. Of the participants who attended the intervention at least once ( n = 20), 75% completed the programme (attended five or more sessions). Feedback from participants rated the sessions as ‘good’ or ‘very good’ and participants reported behavioural change. Researcher observations of intervention delivery showed that the sessions were delivered with high fidelity. The intervention was well delivered and received, but there were significant challenges in recruiting overweight men, and follow-up rates at 3 and 6 months were low. We do not recommend progression to a definitive trial as it was not feasible to deliver the Healthy Dads, Healthy Kids programme to fathers living with overweight and obesity in ethnically erse, socioeconomically deprived communities in the UK. More work is needed to explore the optimal ways to engage fathers from ethnically erse socioeconomically deprived populations in research. Current Controlled Trials ISRCTN16724454. This project was funded by the National Institute for Health Research (NIHR) Public Health Research programme and will be published in full in Public Health Research Vol. 8, No. 2. See the NIHR Journals Library website for further project information.
Publisher: Wiley
Date: 04-2019
DOI: 10.1002/ECE3.5012
Publisher: Frontiers Media SA
Date: 06-09-2021
DOI: 10.3389/FCOSC.2021.719981
Abstract: The conservation of threatened elasmobranchs in tropical regions is challenging due to high local reliance on aquatic and marine resources. Due primarily to fishing pressure, river sharks ( Glyphis ) and sawfishes (Pristidae) have experienced large population declines in the Indo-Pacific. Papua New Guinea (PNG) may offer a refuge for these species, as human population density is low, and river shark and sawfish populations are thought to persist. However, few data are available on these species in PNG, and risk posed by small-scale fishers is poorly understood. This study observed elasmobranch catches in small-scale fisheries in riverine and coastal environments in the East Sepik (northern region), Gulf, and Western Provinces (southern region) of PNG. Surveys were conducted over a period of weeks to months in each region, during the dry season across seven field trips from 2017 to 2020. We observed a total of 783 elasmobranchs encompassing 38 species from 10 families. River sharks made up 29.4% of observations in the southern region, while sawfishes made up 14.8 and 20.3% in the northern and southern regions, respectively. River sharks were commonly caught by small-scale fishers in lower riverine environments in southern PNG, while sawfishes were generally less common and mainly observed through dried rostra. The primary threat to river shark and sawfish populations is their capture by small-scale fishers targeting teleosts for swim bladder. Persisting populations of river sharks and sawfishes indicate that PNG is the second known nation with viable populations of multiple species in the Indo-Pacific. However, populations are declining or at high risk of decline, and fisheries management and conservation are required to realize the potential of PNG as a long-term refuge.
Publisher: Wiley
Date: 14-10-2020
DOI: 10.1002/EDN3.143
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/MF17209
Abstract: Tropical reefs are highly erse ecosystems, and reliable biomonitoring, through diet metabarcoding, is needed to understand present and future trophic relationships in this changing habitat. Several studies have assessed the reliability and effectiveness of single molecular markers however, a cross-marker validation has rarely been performed. This study identified crucial properties for 12S rDNA, 16S rDNA and COI metabarcoding in tropical-reef piscivores (Plectropomus spp.). In addition, three new versatile primer sets for 16S were designed in silico for metabarcoding of reef fish. Results showed that COI was overall better at recovering true ersity because of a well-supported database. Second, optimal 16S licon sizes ranged between 160 and 440 base pairs for full ersity recovery, with increased species detection for the 270-base pairs region. Finally, blocking of predator-specific COI sequences was not equally effective in all host species, potentially introducing bias when diet compositions are directly compared. In conclusion, this novel study showed that marker success for prey identification is highly dependent on the reference database, taxonomic scope, DNA quality, licon length and sequencing platform. Results suggest that COI, complemented with 16S, yields the best outcome for diet metabarcoding in reef piscivores. Findings in this paper are relevant to other piscivores and other metabarcoding applications.
Publisher: CSIRO
Date: 2021
DOI: 10.25919/D6QD-P002
Publisher: Springer Science and Business Media LLC
Date: 27-07-2021
Publisher: Wiley
Date: 13-07-2020
Publisher: CSIRO Publishing
Date: 2019
DOI: 10.1071/MF18296
Abstract: The silvertip shark (Carcharhinus albimarginatus) is a reef-associated shark, with an intermittent distribution across the Indo-Pacific Ocean. Owing to global declines, the species is listed as Vulnerable under the International Union of Conservation for Nature Red List. S les from 152C. albimarginatus were collected from three locations: Papua New Guinea (PNG), east Australia and Seychelles. S les were analysed using mitochondrial, microsatellite and double-digest restriction-associated DNA (ddRAD) generated single nucleotide polymorphism markers. As expected across a vast oceanic expanse, no gene flow was identified between south-west Pacific locations and Seychelles for any marker (population differentiation measured using ΦST values 0.92–0.98, FST values 0.036–0.059). Mitochondrial DNA indicated significant population structuring between PNG and east Australia (ΦST=0.102), but nuclear markers suggested connectivity between these geographically close regions (FST=0.000–0.001). In combination with known telemetry movements for C. albimarginatus, our results suggest stepping-stone patterns of movement between regions is likely driven by reproductive requirements. The use of three distinct marker types in this study has facilitated a powerful genetic description of the population connectivity of C. albimarginatus between the three s led regions. Importantly, the connectivity described between PNG and east Australia should be used as a guide for managing the south-west Pacific stock of C. albimarginatus.
Publisher: Elsevier BV
Date: 04-2016
DOI: 10.1016/J.MARPOLBUL.2016.03.008
Abstract: DNA efficiently contributes to detect and understand marine invasions. In 2014 the potential biological pollutant pygmy mussel (Xenostrobus securis) was observed for the first time in the Avilés estuary (Asturias, Bay of Biscay). The goal of this study was to assess the stage of invasion, based on demographic and genetic (DNA Barcoding) characteristics, and to develop a molecular tool for surveying the species in environmental DNA. A total of 130 in iduals were analysed for the DNA Barcode cytochrome oxidase I gene in order to determine genetic ersity, population structure, expansion trends, and to inferring introduction hits. Reproduction was evidenced by bimodal size distributions of 1597 mussels. High population genetic variation and genetically distinct clades might suggest multiple introductions from several source populations. Finally, species-specific primers were developed within the DNA barcode for PCR lification from water s les in order to enabling rapid detection of the species in initial expansion stages.
Publisher: Wiley
Date: 25-12-2022
DOI: 10.1111/MEC.16822
Abstract: The blue shark Prionace glauca is a top predator with one of the widest geographical distributions of any shark species. It is classified as Critically Endangered in the Mediterranean Sea, and Near Threatened globally. Previous genetic studies did not reject the null hypothesis of a single global population. The blue shark was proposed as a possible archetype of the “grey zone of population differentiation,” coined to designate cases where population structure may be too recent or too faint to be detected using a limited set of markers. Here, blue shark s les collected throughout its global range were sequenced using a specific RAD method (DArTseq), which recovered 37,655 genome‐wide single nucleotide polymorphisms (SNPs). Two main groups emerged, with Mediterranean Sea and northern Atlantic s les (Northern population) differentiated significantly from the Indo‐west Pacific s les (Southern population). Significant pairwise F ST values indicated further genetic differentiation within the Atlantic Ocean, and between the Atlantic Ocean and the Mediterranean Sea. Reconstruction of recent demographic history suggested ergence between Northern and Southern populations occurred about 500 generations ago and revealed a drastic reduction in effective population size from a large ancestral population. Our results illustrate the power of genome scans to detect population structure and reconstruct demographic history in highly migratory marine species. Given that the management plans of the blue shark (targeted or bycatch) fisheries currently assume panmictic regional stocks, we strongly recommend that the results presented here be considered in future stock assessments and conservation strategies.
Publisher: Elsevier BV
Date: 09-2016
DOI: 10.1016/J.MARPOLBUL.2016.06.072
Abstract: Early detection of dangerous exotic species is crucial for stopping marine invasions. The New Zealand pygmy mussel Xenostrobus securis is a problematic species in coasts of temperate regions in the northern hemisphere. In this study we have controlled a population of this invader that recently expanded in a north Iberian estuary with both a participatory approach involving researchers and citizens, and employing a sensitive eDNA-based tool to monitor the population expansion in the estuary. Results demonstrate successful eradication of pygmy mussels in the outer part of the estuary with citizen science and the practical utility of eDNA for controlling biological invasions.
Publisher: Wiley
Date: 02-2023
DOI: 10.1002/ECE3.9837
Abstract: The Bull Shark ( Carcharhinus leucas ) faces varying levels of exploitation around the world due to its coastal distribution. Information regarding population connectivity is crucial to evaluate its conservation status and local fishing impacts. In this study, we s led 922 putative Bull Sharks from 19 locations in the first global assessment of population structure of this cosmopolitan species. Using a recently developed DNA‐capture approach (DArTcap), s les were genotyped for 3400 nuclear markers. Additionally, full mitochondrial genomes of 384 Indo‐Pacific s les were sequenced. Reproductive isolation was found between and across ocean basins (eastern Pacific, western Atlantic, eastern Atlantic, Indo‐West Pacific) with distinct island populations in Japan and Fiji. Bull Sharks appear to maintain gene flow using shallow coastal waters as dispersal corridors, whereas large oceanic distances and historical land‐bridges act as barriers. Females tend to return to the same area for reproduction, making them more susceptible to local threats and an important focus for management actions. Given these behaviors, the exploitation of Bull Sharks from insular populations, such as Japan and Fiji, may instigate local decline that cannot readily be replenished by immigration, which can in turn affect ecosystem dynamics and functions. These data also supported the development of a genetic panel to ascertain the population of origin, which will be useful in monitoring the trade of fisheries products and assessing population‐level impacts of this harvest.
Publisher: Authorea, Inc.
Date: 13-10-2022
DOI: 10.22541/AU.166565534.40119015/V1
Abstract: Understanding the population structure of a species is important to accurately assess its conservation status and manage the risk of local extinction. The Bull Shark ( Carcharhinus leucas ) faces varying levels of exploitation around the world due to its coastal distribution. Information regarding population connectivity is crucial to evaluate its conservation status and local fishing impacts. In this study, we s led 922 putative Bull Sharks from 19 locations in the first global assessment of population structure of this cosmopolitan species. Using a recently developed DNA-capture approach (DArTcap), s les were genotyped for 3,400 nuclear markers. Additionally, full mitochondrial genomes of 384 Indo-Pacific s les were sequenced. Reproductive isolation was found between and across ocean basins (eastern Pacific, western Atlantic, eastern Atlantic, Indo-West Pacific) with distinct island populations in Japan and Fiji. Bull Sharks appear to maintain reproductive connectivity using shallow coastal waters as dispersal corridors, whereas large oceanic distances and historical land-bridges act as barriers. Females tend to return to the same area for reproduction, making them more susceptible to local threats and an important focus for management actions. Given these behaviours, the exploitation of Bull Sharks from insular populations, such as Japan and Fiji, may instigate local decline that cannot readily be replenished by immigration, which can in turn affect ecosystem dynamics and functions. These data also supported the development of a genetic panel to ascertain the population of origin, which will be useful in monitoring the trade of fisheries products and assessing population-level impacts of this harvest.
Publisher: Wiley
Date: 29-08-2018
DOI: 10.1002/ECE3.4456
Location: Australia
Location: Australia
No related grants have been discovered for Floriaan Devloo-Delva.