Tracing the origin of olive ridley turtles entangled in ghost nets in the Maldives: A phylogeographic assessment of populations at risk

Journal article


Stelfox, M., Burian, A., Shanker, Kartik, Rees, Alan F., Jean, Claire, Willson, Maïa S., Manik, Nashwa Ahmed and Sweet, Michael 2020. Tracing the origin of olive ridley turtles entangled in ghost nets in the Maldives: A phylogeographic assessment of populations at risk. Biological Conservation. 245, pp. 1-10. https://doi.org/10.1016/j.biocon.2020.108499
AuthorsStelfox, M., Burian, A., Shanker, Kartik, Rees, Alan F., Jean, Claire, Willson, Maïa S., Manik, Nashwa Ahmed and Sweet, Michael
Abstract

Abandoned, lost or discarded fishing nets, (ghost nets) represent a major threat to marine vertebrates. However, thorough assessments of their impact on threatened species are largely missing. In the Maldives, olive ridley sea turtles (Lepidochelys olivacea) are frequently caught in ghost nets however the archipelago does not support a significant nesting population. Our aim in this study was to determine the origin of olive ridleys entangled in ghost nets found in the Maldives and evaluate potential impacts on respective source populations. Based on a citizen science and conservation program, we recorded 132 olive ridley turtles entangled in ghost nets in just one year. Genetic analyses (mtDNA) of entangled individuals and of potential source populations revealed that most captured olive ridleys originated from Sri Lanka and eastern India. Oman could be excluded as source population, even during the prevalence of the south west monsoon. Based on our results and already available published literature, we were able to estimate that the recorded ghost net entanglements accounted for a relatively small amount (0.48%) of the eastern Indian population. However, the entangled turtles accounted for a much larger percentage (41%) of the Sri Lankan populations. However, it should be noted that our estimates of population-level mortality are linked to substantial uncertainty due to the lack of reliable information on population dynamics. Consequently, any precautionary protection measures applied should be complemented with improved quantification of turtle recruitment and life-stage specific mortalities.

KeywordsEcology, Evolution, Behavior and Systematics; Nature ; Landscape Conservation
Year2020
JournalBiological Conservation
Journal citation245, pp. 1-10
PublisherElsevier BV
ISSN0006-3207
Digital Object Identifier (DOI)https://doi.org/10.1016/j.biocon.2020.108499
Web address (URL)https://www.sciencedirect.com/science/article/abs/pii/S0006320719313874?via%3Dihub
hdl:10545/624685
Output statusPublished
Publication dates07 Apr 2020
Publication process dates
Deposited07 Apr 2020, 15:59
Accepted29 Feb 2020
Rights

© 2020 Elsevier Ltd. All rights reserved.

ContributorsUniversity of Derby, Olive Ridley Project, 11 Dane Close, Bramhall, Stockport, Cheshire, Centre for Ecological Sciences, Indian Institute of Science, Bangalore, India, Dakshin Foundation, Bangalore, India, University of Exeter, Kelonia, 46 rue du General De Gaulle, 97436 Saint Leu, La Reunion, France, Environment Society of Oman, Oman and Environmental Protection Agency, Maldives
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Robinson, Louise, Turner, Ian J. and Sweet, Michael J. 2018. The use of gamification in the teaching of disease epidemics and pandemics. FEMS Microbiology Letters. 365 (11), pp. 1-4. https://doi.org/10.1093/femsle/fny111
Topographic shading influences cryoconite morphodynamics and carbon exchange.
Cook, J. M., Sweet, Michael J., Cavalli, O., Taggart, A. and Edwards, A. 2018. Topographic shading influences cryoconite morphodynamics and carbon exchange. Arctic, Antarctic, and Alpine Research.. https://doi.org/10.1080/15230430.2017.1414463
Maintaining natural spawning timing in Acropora corals following long distance inter-continental transportation.
Craggs, Jamie, Guest, James R., Brett, Aaron, Davis, Michelle and Sweet, Michael J. 2018. Maintaining natural spawning timing in Acropora corals following long distance inter-continental transportation. Journal of zoo and aquarium research. https://doi.org/10.19227/jzar.v6i2.317
First detection of a highly invasive freshwater amphipod (Crangonyx floridanus) in the United Kingdom
Mauvisseau, Q., John Davy-Bowker, David Bryson, Graham R. Souch, Burian, A. and Michael Sweet 2018. First detection of a highly invasive freshwater amphipod (Crangonyx floridanus) in the United Kingdom. Regional Euro-Asian biological Invasions Centre. https://doi.org/10.1101/437301
An Introduction to Molecular Ecology
Rowe, G., Sweet, M. and Trevor Beebee 2017. An Introduction to Molecular Ecology. Oxford University Press.
Symbiotic microbes from marine invertebrates: Driving a new era of natural product drug discovery.
Blockley, Alix, Elliott, D., Roberts, Adam and Sweet, Michael J. 2017. Symbiotic microbes from marine invertebrates: Driving a new era of natural product drug discovery. Diversity. 9 (4), pp. 1-13. https://doi.org/10.3390/d9040049
Designer reefs and coral probiotics; great concepts but are they good practice?
Sweet, M., Ramsey, A. and Bulling, M. 2017. Designer reefs and coral probiotics; great concepts but are they good practice? Biodiversity. https://doi.org/10.1080/14888386.2017.1307786
Inducing broadcast coral spawning ex situ: Closed system mesocosm design and husbandry protocol.
Craggs, Jamie, Guest, James R., Davis, Michelle, Simmons, Jeremy, Dashti, Ehsan and Sweet, Michael J. 2017. Inducing broadcast coral spawning ex situ: Closed system mesocosm design and husbandry protocol. Ecology and Evolution. https://doi.org/10.1002/ece3.3538
Evidence for rapid, tide-related shifts in the microbiome of the coral Coelastrea aspera
Sweet, Michael J., Brown, Barbara E., Dunne, Richard P., Singleton, Ian and Bulling, Mark T. 2017. Evidence for rapid, tide-related shifts in the microbiome of the coral Coelastrea aspera. Coral Reefs. https://doi.org/10.1007/s00338-017-1572-y
The “resort effect”: Can tourist islands act as refuges for coral reef species?
Charlotte Moritz, Frédéric Ducarme, Sweet, M., Michael D. Fox, Brian Zgliczynski, Nizam Ibrahim, Ahmed Basheer, Kathryn A. Furby, Zachary R. Caldwell, Chiara Pisapia, Gabriel Grimsditch and Ameer Abdulla 2017. The “resort effect”: Can tourist islands act as refuges for coral reef species? Diversity and Distributions. https://doi.org/10.1111/ddi.12627
On the importance of the microbiome and pathobiome in coral health and disease
Sweet, M. and Bulling, M. 2017. On the importance of the microbiome and pathobiome in coral health and disease. Frontiers in Marine Sciences. https://doi.org/10.3389/fmars.2017.00009
'Yellow Syndrome' in scleractinian corals throughout Bintain District, Kepulauan Riau Province, Indonesia
Johan, O., Budianto, O. and Sweet, M. 2017. 'Yellow Syndrome' in scleractinian corals throughout Bintain District, Kepulauan Riau Province, Indonesia. Indonesia Aquaculture Journal. 12 (1), pp. 37-42. https://doi.org/10.15578/iaj.12.1.2017.37-42
Variation in size frequency distribution of coral populations under different fishing pressures in two contrasting locations in the Indian Ocean.
Grimsditch, Gabriel, Pisapia, Chiara, Huck, M., Karisa, Juliet, Obura, David and Sweet, M. 2017. Variation in size frequency distribution of coral populations under different fishing pressures in two contrasting locations in the Indian Ocean. Marine Environmental Research. https://doi.org/10.1016/j.marenvres.2017.09.017
Juvenile “black teatfish” in Maldives
Sweet, M., Ducarme, F. and Conand, C. 2016. Juvenile “black teatfish” in Maldives. SPC Beche-de-mer Information Bulletin #36. pp. 1-2.
Coral responses to anthropogenic stress in the twenty-first century: an ecophysiological perspective
Sweet, M. and Brown B.E. 2016. Coral responses to anthropogenic stress in the twenty-first century: an ecophysiological perspective. in: Oceanography and Marine Biology CRC Press. pp. 271 - 314
Is Acropora palmata recovering? A case study in Los Roques National Park, Venezula
Aldo Croquer, Francoise Cavada-Blanco, Ainhoa L Zubillaga, Esteban A Agudo-Adriani and Sweet, M. 2016. Is Acropora palmata recovering? A case study in Los Roques National Park, Venezula. PeerJ. (eCollection 2016). https://doi.org/10.7717/peerj.1539
Baseline reef health surveys at Bangka Island (North Sulawesi, Indonesia) reveal new threats
Massimo Ponti, Francesca Fratangeli, Nicolò Dondi, Marco Segre Reinach, Clara Serra and Sweet, M. 2016. Baseline reef health surveys at Bangka Island (North Sulawesi, Indonesia) reveal new threats. PeerJ. https://doi.org/10.7717/peerj.2614
The role of viruses in coral health and disease
Sweet, M. and John Bythell 2016. The role of viruses in coral health and disease. Journal of Invertebrate Biology. https://doi.org/10.1016/j.jip.2016.12.005
Molecular changes in skin pigmented lesions of the coral trout Plectropomus leopardus
Adélaïde Lerebours, Emma C Chapman, Sweet, M., Jeanette M Rotchell and Michelle R Heupel 2016. Molecular changes in skin pigmented lesions of the coral trout Plectropomus leopardus. Marine Environmental Research. https://doi.org/10.1016/j.marenvres.2016.07.009
Influence of Resource Availability on the Foraging Strategies of the Triangle Butterflyfish Chaetodon triangulum in the Maldives
Sweet, M. 2016. Influence of Resource Availability on the Foraging Strategies of the Triangle Butterflyfish Chaetodon triangulum in the Maldives. PLos ONE. https://doi.org/10.1371/journal.pone.0151923
New disease outbreak affects two dominant sea urchin species associated with Australian temperate reefs
Sweet, M. and Bulling, M. 2016. New disease outbreak affects two dominant sea urchin species associated with Australian temperate reefs. Marine Ecological Progress Series. https://doi.org/10.3354/meps11750
A review of ghost gear entanglement amongst marine mammals, reptiles and elasmobranchs
Martin Stelfox, Jillian Hudgins and Sweet, M. 2016. A review of ghost gear entanglement amongst marine mammals, reptiles and elasmobranchs. Marine Pollution Bulletin. https://doi.org/10.1016/j.marpolbul.2016.06.034
Is Acropora Palmata recovering? A case study in Los Roques National Park, Venezuela
Croquer, Aldo, Cavada-Blanco, Francoise, Zubillaga, Ainhoa L., Agudo-Adriani, Esteban A. and Sweet, Michael J. 2016. Is Acropora Palmata recovering? A case study in Los Roques National Park, Venezuela. PeerJ. https://doi.org/10.7717/peerj.1539
Metabolome-mediated biocryomorphic evolution promotes carbon fixation in Greenlandic cryoconite holes
Joseph M Cook, Arwyn Edwards, Bulling, M., Luis A J Mur, Sophie Cook, Jarishma K Gokul, Karen A Cameron, Sweet, M. and Tristram D L Irvine-Fynn 2016. Metabolome-mediated biocryomorphic evolution promotes carbon fixation in Greenlandic cryoconite holes. Environmental Microbiology. https://doi.org/10.1111/1462-2920.13349
Coral responses to anthropogenic stress in the 21st Century – An ecophysiological perspective.
Sweet, Michael J. and Brown, Barbara E. 2016. Coral responses to anthropogenic stress in the 21st Century – An ecophysiological perspective. in: Taylor & Francis.
Prevalence and Incidence of Black Band Disease of Scleractinian Corals in the Kepulauan Seribu Region of Indonesia
Johan, Ofri, Zamany, Neviaty P., Smith, David and Sweet, M. 2016. Prevalence and Incidence of Black Band Disease of Scleractinian Corals in the Kepulauan Seribu Region of Indonesia. Diversity. https://doi.org/10.3390/d8020011
Microbial communities associated with healthy and white syndrome-affected Echinopora lamellose in aquaria and experimental treatment with the antibiotic ampicillin
Smith, D., Leary, P., Craggs, J., Bythell, J. and Sweet, M. 2015. Microbial communities associated with healthy and white syndrome-affected Echinopora lamellose in aquaria and experimental treatment with the antibiotic ampicillin. PLos ONE. 10 (3), pp. 1-17. https://doi.org/10.1371/journal.pone.0121780
Identification of a bacterial pathogen associated with Porites white patch syndrome in the Western Indian Ocean
Mathieu G Séré, Pablo Tortosa, Pascale Chabanet, Jean-Pascal Quod, Sweet, M. and Michael H Schleyer 2015. Identification of a bacterial pathogen associated with Porites white patch syndrome in the Western Indian Ocean. Molecular Ecology. https://doi.org/10.1111/mec.13326
Ciliate communities consistently associated with coral diseases
Sweet, Michael J. and Séré, Mathieu G. 2015. Ciliate communities consistently associated with coral diseases. Journal of Sea Research. https://doi.org/10.1016/j.seares.2015.06.008
Fostering effective international collaboration for marine science in small island states
Hind, Edward J., Alexander, Steven M., Green, Stephanie J., Kritzer, Jacob P., Sweet, M., Johnson, Ayana Elizabeth, Amargós, Fabian P., Smith, Nicola S. and Angelie M. 2015. Fostering effective international collaboration for marine science in small island states. Frontiers in Marine Science. https://doi.org/10.3389/fmars.2015.00086
Geographically conserved rates of background mortality among common reef-building corals in Lhaviyani Atoll, Maldives versus northern Great Barrier Reef, Australia
Sweet, M. 2015. Geographically conserved rates of background mortality among common reef-building corals in Lhaviyani Atoll, Maldives versus northern Great Barrier Reef, Australia. Marine Biology. 162 (8). https://doi.org/10.1007/s00227-015-2694-9
Diseases in marine invertebrates associated with mariculture and commercial fisheries
Sweet, M. and Kelly S Bateman 2015. Diseases in marine invertebrates associated with mariculture and commercial fisheries. Journal of Sea Research. https://doi.org/10.1016/j.seares.2015.06.016
Age-Related Shifts in Bacterial Diversity in a Reef Coral
Alex D Williams, Barbara E Brown, Lalita Putchim and Sweet, M. 2015. Age-Related Shifts in Bacterial Diversity in a Reef Coral. PLos ONE. 10 (2). https://doi.org/10.1371/journal.pone.0144902
A novel sponge disease caused by a consortium of micro-organisms
Sweet, M. 2015. A novel sponge disease caused by a consortium of micro-organisms. Coral Reefs. https://doi.org/10.1007/s00338-015-1284-0
Baseline coral disease surveys within three marine parks in Sabah, Borneo
Jennifer Miller, Sweet, M., Elizabeth Wood and John Bythell 2015. Baseline coral disease surveys within three marine parks in Sabah, Borneo. PeerJ. https://doi.org/10.7717/peerj.1391
White Syndrome in Acropora muricata: Non-specific bacterial infection and ciliate histophagy
Sweet, M. and Bythell, J. 2015. White Syndrome in Acropora muricata: Non-specific bacterial infection and ciliate histophagy. Molecular Ecology. 24, p. 1150–1159. https://doi.org/10.1111/mec.13097
The distribution and abundance of black band disease and white syndrome in Kepulauan Seribu, Indonesia
Johan, Ofri, Bengen, Dietriech Geoffrey, Zamani, Neviaty Putri, Suharsono and Sweet, M. 2015. The distribution and abundance of black band disease and white syndrome in Kepulauan Seribu, Indonesia. Journal of Biosciences. https://doi.org/10.1016/j.hjb.2015.09.001
Soil contamination with silver nanoparticles reduces Bishop pine growth and ectomycorrhizal diversity on pine roots
Sweet, M. and I Singleton 2015. Soil contamination with silver nanoparticles reduces Bishop pine growth and ectomycorrhizal diversity on pine roots. Journal of Nanoparticle Research. https://doi.org/10.1007/s11051-015-3246-4
A novel investigation of a blister-like syndrome in aquarium Echinopora lamellosa
David Smith, Peter Leary, Mark Bendall, Edmund Flach, Rachel Jones and Sweet, M. 2014. A novel investigation of a blister-like syndrome in aquarium Echinopora lamellosa. PLos ONE. https://doi.org/10.1371/journal.pone.0097018
Experimental antibiotic treatment identifies potential pathogens of white band disease in the endangered Caribbean coral Acropora cervicornis
Sweet, M., A Croquer and J C Bythell 2014. Experimental antibiotic treatment identifies potential pathogens of white band disease in the endangered Caribbean coral Acropora cervicornis. Proc Roy Soc. https://doi.org/10.1098/rspb.2014.0094
Decadal environmental ‘memory’ in a reef coral?
Brown B.E., Dunne R.P., Edwards A.J., Sweet, M. and Phongsuwan N. 2014. Decadal environmental ‘memory’ in a reef coral? Marine Biology. https://doi.org/10.1007/s00227-014-2596-2
Coral diseases in aquaria and in nature
Sweet, Michael J., Jones, Rachel and Bythell, John C. 2013. Coral diseases in aquaria and in nature. https://doi.org/10.1017/S0025315411001688
Development of bacterial biofilms on artificial corals in comparison to surface-associated microbes of hard corals
Sweet, Michael J., Croquer, Aldo, Bythell, John C. and Lopez-Garcia, Purification 2013. Development of bacterial biofilms on artificial corals in comparison to surface-associated microbes of hard corals. https://doi.org/10.1371/journal.pone.0021195
Characterisation of the bacterial and fungal communities associated with different lesion sizes of Dark Spot Syndrome occurring in the Coral Stephanocoenia intersepta
Sweet, Michael J., Burn, Deborah, Croquer, Aldo, Leary, Peter and Bereswill, Stefan 2013. Characterisation of the bacterial and fungal communities associated with different lesion sizes of Dark Spot Syndrome occurring in the Coral Stephanocoenia intersepta. https://doi.org/10.1371/journal.pone.0062580
Evidence of melanoma in wild marine fish populations
Sweet, Michael J., Kirkham, Nigel, Bendall, Mark, Currey, Leanne, Bythell, John C., Heupel, Michelle and Vartanian, Jean-Pierre 2013. Evidence of melanoma in wild marine fish populations. https://doi.org/10.1371/journal.pone.0041989
Metal-based nanoparticles; size, function and areas for advancement
Sweet, Michael J. 2013. Metal-based nanoparticles; size, function and areas for advancement. in:
Diseases in coral aquaculture: causes, implications and preventions
Kramarsky-Winter, Esti, Sweet, Michael J., Leal, Miguel Costa, Sheridan, Christopher and Kushmaro, Ariel 2013. Diseases in coral aquaculture: causes, implications and preventions. Aquaculture. https://doi.org/10.1016/j.aquaculture.2013.02.037
Assessment of the microbial communities associated with white syndrome and brown jelly syndrome in aquarium corals
Sweet, Michael J., Craggs, J., Robson, J. and Bythell, John C. 2013. Assessment of the microbial communities associated with white syndrome and brown jelly syndrome in aquarium corals.
Microsatellites for microbiologists
Sweet, Michael J., Scriven, Lucinda A. and Singleton, Ian 2012. Microsatellites for microbiologists. Advances in Applied Microbiology. https://doi.org/10.1016/B978-0-12-394382-8.00005-8