Challenges and priorities for river cetacean conservation

Campbell, Elizabeth, Alfaro-Shigueto, Joanna, Aliaga-Rossel, Enzo, Beasley, Isabel, Briceno, Yurasi, Caballero, Susana, da Silva, Vera M. F., Gilleman, Cedric, Gravena, Waleska, Hines, Ellen, Khan, Mohd Shahnawaz, Khan, Uzma, Kreb, Danielle, Mangel, Jeffrey C., Marmontel, Miriam, Mei, Zhigang, Mintzer, Vanessa J., Mosquera-Guerra, Federico, Oliveira-da-Costa, Marcelo, Paschoalini, Mariana, Paudel, Shambhu, Sinha, Ravindra Kumar, Smith, Brian D., Turvey, Samuel T., Utreras, Victor, Van Damme, Paul Andre, Wane, Ding, Whitty, Tara Sayuri, Thurstan, Ruth H., and Godley, Brendan J. (2022) Challenges and priorities for river cetacean conservation. Endangered Species Research, 49. pp. 13-42.

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Abstract

River cetaceans are particularly vulnerable to anthropogenic impacts due to their constrained ranges in freshwater systems of China, South Asia, and South America. We undertook an exhaustive review of 280 peer-reviewed papers and grey literature reports (1998-2020) to examine the current status of knowledge regarding these cetaceans and their conservation. We aimed to better understand the scale of threats they face, and to identify and propose priority future efforts to better conserve these species. We found that the species have been studied with varying frequency and that most of the research on threats has focused on habitat degradation and fragmentation (43%, mainly driven by dams and extractive activities such as sand mining and deforestation), and fishery interactions (39%, in the form of bycatch and direct take). These threats occur across all species, but more information is needed, primarily on quantifying the population impacts as a basis for designing mitigation measures. Other threats identified include pollution, vessel collisions, traditional use, and poorly managed tourism. Emerging methods such as environmental DNA and unmanned aerial vehicles are described for studying these species. Promising conservation interventions include cetacean-specific protected areas, natural ex situ protection, community-led conservation, and education programmes. However, transnational political will is required for a step change towards broad-scale protection in freshwater environments. In addition, we propose increasing capacity building, developing management plans, working closely with fishing communities, enhancing public awareness, expanding regional collaborations, and diversifying funding.

Item ID: 76696
Item Type: Article (Research - C1)
ISSN: 1613-4796
Keywords: River dolphins, Threat, Management, Bycatch, Dams, Dolphin-fishery interactions, Research prioritisation, Emerging methods
Copyright Information: © The authors 2022. Open Access under Creative Commons by Attribution Licence. Use, distribution and reproduction are un restricted. Authors and original publication must be credited.
Date Deposited: 02 Nov 2022 07:32
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310304 Freshwater ecology @ 100%
SEO Codes: 18 ENVIRONMENTAL MANAGEMENT > 1803 Fresh, ground and surface water systems and management > 180303 Fresh, ground and surface water biodiversity @ 100%
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