Affiliation:
1. Graduate Program in Ecology and Evolution, Instituto de Biologia Roberto Alcantara Gomes (IBRAG) Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil
2. Laboratório de Ecologia e Conservação Marinha, Department of Ecology Universidade Federal do Rio de Janeiro Rio de Janeiro Brazil
3. Graduate Program in Animal Biology Universidade Federal Rural do Rio de Janeiro Rio de Janeiro Brazil
4. Graduate Program in Neotropical Biodiversity Universidade Federal do Estado do Rio de Janeiro Rio de Janeiro Brazil
5. Instituto Federal do Rio de Janeiro Nilópolis Brazil
6. Department of Ecology, IBRAG Universidade do Estado do Rio de Janeiro Rio de Janeiro Brazil
Abstract
Abstract
Despite the importance of coastal habitats for the provision of many ecosystem services, these areas are currently among the most impacted by human activities. Impacts on coastal ecosystems may affect many key species, such as the Guiana dolphin, which inhabits Sepetiba Bay in south‐eastern Brazil, a highly degraded environment owing to a human‐induced rapid environmental change.
In this context, this study investigates the potential changes in the local Guiana dolphin behaviour, group structure, bioacoustics, site fidelity and habitat use over the past 20 years.
For this, a historical database (1998–2007) was compared with current data on the local dolphin population (2017–2019).
Between 2017 and 2019, the Guiana dolphins form significantly smaller groups (W = 3262.5, P > 0.001), spend more time foraging (61 vs. 10% in the past), emit whistles at a considerably lower rate (decreasing by 85.2%), have reduced site fidelity and now use a larger area.
As Sepetiba Bay has been severely impacted by human activities in the recent past, with profound consequences for much of its biodiversity, the observed changes in dolphin behaviour are probably a consequence of habitat degradation and, in particular, of reduced prey availability. These findings have important implications for the management and conservation of the Guiana dolphin population of Sepetiba Bay.
To break this human‐induced rapid environmental change, it will be essential to minimize the spatio‐temporal overlap of anthropogenic impacts, to avoid cumulative impacts. To mitigate anthropogenic impacts on the Guiana dolphins of Sepetiba Bay, it will be important to direct the following actions: (i) the regulation and control of anthropogenic noise; (ii) reduction and control of the release of chemical contaminants and organic effluents; (iii) more effective controls on vessel traffic within the areas used preferentially by the Guiana dolphin; and (iv) the implementation of measures to avoid overfishing and bycatch.
Funder
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Subject
Nature and Landscape Conservation,Ecology,Aquatic Science
Reference128 articles.
1. Natural and anthropogenically-produced brominated compounds in endemic dolphins from Western South Atlantic: Another risk to a vulnerable species
2. Brown algae species as biomonitors of Zn and Cd at Sepetiba Bay, Rio de Janeiro, Brazil
3. Opsanus beta (Goode & Bean, 1880) (Acanthopterygii: Batrachoididae), a non-indigenous toadfish in Sepetiba Bay, south-eastern Brazil
4. Anibolete D.R.S.(2022).Quo Vadis: habitat suitability and movements of the Guiana dolphin [Sotalia guianensis(van Bénéden 1864)] between Sepetiba and Ilha Grande bays State of Rio de Janeiro Southeast Brazil. Thesis of Master's Degree Federal University of Rio de Janeiro State (in Portuguese).
5. ANTAQ – Agência Nacional de Transporte Aquaviário. (2022).Estatístico Aquaviário.http://anuario.antaq.gov.br[Accessed 4th May 2022].
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献