How to Reduce the Risk of Predation of Green Turtle Nests by Nile Monitors

Detalhes bibliográficos
Autor(a) principal: Sampaio, Manuel Sá
Data de Publicação: 2022
Outros Autores: Sampaio e rebelo, Rui, Regalla, Aissa, Barbosa, Castro, Catry, Paulo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/55851
Resumo: ABSTRACT. – Predation of nests and hatchlings can significantly reduce sea turtle reproductive output. On Cavalos island, João Vieira and Poilão Marine National Park (PNMJVP), Bijagos archipelago, Guinea-Bissau, one of the primary threats to green turtle nests is natural predation, by Nile monitors. In this study, we tested three different nest protection techniques - disguising scent cues, disguising visual cues, and placing a metal net over the nest - to reduce predation on green turtle nests by Nile monitors. Nests were monitored for 10 days after they were laid, and we found that using metal nets and disguising scent cues led to a significant increase of the number of days it took for Nile monitors to find and predate the nests. Overall reduction in predation rates also approached significance when metal nets or disguising scent cues were used. We used the Risk Reduction metric to compare the effectiveness of our experiment with other nest protection techniques; our results corresponded to a >50% decrease of the risk of predation, a value comparable or better than other techniques used elsewhere. We suggest that camouflaging a nest’s scent may be the most cost30 efficient management option to reduce predation rates by Nile monitors in sensitive areas without damaging the local ecosystem.
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spelling How to Reduce the Risk of Predation of Green Turtle Nests by Nile MonitorsABSTRACT. – Predation of nests and hatchlings can significantly reduce sea turtle reproductive output. On Cavalos island, João Vieira and Poilão Marine National Park (PNMJVP), Bijagos archipelago, Guinea-Bissau, one of the primary threats to green turtle nests is natural predation, by Nile monitors. In this study, we tested three different nest protection techniques - disguising scent cues, disguising visual cues, and placing a metal net over the nest - to reduce predation on green turtle nests by Nile monitors. Nests were monitored for 10 days after they were laid, and we found that using metal nets and disguising scent cues led to a significant increase of the number of days it took for Nile monitors to find and predate the nests. Overall reduction in predation rates also approached significance when metal nets or disguising scent cues were used. We used the Risk Reduction metric to compare the effectiveness of our experiment with other nest protection techniques; our results corresponded to a >50% decrease of the risk of predation, a value comparable or better than other techniques used elsewhere. We suggest that camouflaging a nest’s scent may be the most cost30 efficient management option to reduce predation rates by Nile monitors in sensitive areas without damaging the local ecosystem.BioOneRepositório da Universidade de LisboaSampaio, Manuel SáSampaio e rebelo, RuiRegalla, AissaBarbosa, CastroCatry, Paulo2023-01-13T13:30:48Z2022-122022-12-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/55851eng10.2744/CCB-1553.1metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-11-08T17:02:59Zoai:repositorio.ul.pt:10451/55851Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T22:06:23.379107Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv How to Reduce the Risk of Predation of Green Turtle Nests by Nile Monitors
title How to Reduce the Risk of Predation of Green Turtle Nests by Nile Monitors
spellingShingle How to Reduce the Risk of Predation of Green Turtle Nests by Nile Monitors
Sampaio, Manuel Sá
title_short How to Reduce the Risk of Predation of Green Turtle Nests by Nile Monitors
title_full How to Reduce the Risk of Predation of Green Turtle Nests by Nile Monitors
title_fullStr How to Reduce the Risk of Predation of Green Turtle Nests by Nile Monitors
title_full_unstemmed How to Reduce the Risk of Predation of Green Turtle Nests by Nile Monitors
title_sort How to Reduce the Risk of Predation of Green Turtle Nests by Nile Monitors
author Sampaio, Manuel Sá
author_facet Sampaio, Manuel Sá
Sampaio e rebelo, Rui
Regalla, Aissa
Barbosa, Castro
Catry, Paulo
author_role author
author2 Sampaio e rebelo, Rui
Regalla, Aissa
Barbosa, Castro
Catry, Paulo
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Sampaio, Manuel Sá
Sampaio e rebelo, Rui
Regalla, Aissa
Barbosa, Castro
Catry, Paulo
description ABSTRACT. – Predation of nests and hatchlings can significantly reduce sea turtle reproductive output. On Cavalos island, João Vieira and Poilão Marine National Park (PNMJVP), Bijagos archipelago, Guinea-Bissau, one of the primary threats to green turtle nests is natural predation, by Nile monitors. In this study, we tested three different nest protection techniques - disguising scent cues, disguising visual cues, and placing a metal net over the nest - to reduce predation on green turtle nests by Nile monitors. Nests were monitored for 10 days after they were laid, and we found that using metal nets and disguising scent cues led to a significant increase of the number of days it took for Nile monitors to find and predate the nests. Overall reduction in predation rates also approached significance when metal nets or disguising scent cues were used. We used the Risk Reduction metric to compare the effectiveness of our experiment with other nest protection techniques; our results corresponded to a >50% decrease of the risk of predation, a value comparable or better than other techniques used elsewhere. We suggest that camouflaging a nest’s scent may be the most cost30 efficient management option to reduce predation rates by Nile monitors in sensitive areas without damaging the local ecosystem.
publishDate 2022
dc.date.none.fl_str_mv 2022-12
2022-12-01T00:00:00Z
2023-01-13T13:30:48Z
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