Density and Abundance Estimation of Amazonian River Dolphins: Understanding Population Size Variability

The dolphins <i>Inia geoffrensis</i>—boto and <i>Sotalia fluviatilis</i>—tucuxi are threatened cetaceans inhabiting river ecosystems in South America; population numbers are still lacking for many areas. This paper provides density and abundance estimations of boto and tucuxi...

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Autores principales:	Mariana Paschoalini, Fernando Trujillo, Miriam Marmontel, Federico Mosquera-Guerra, Renan Lopes Paitach, Heloise Pavanato Julião, Gabriel Melo Alves dos Santos, Paul André Van Damme, André Giovanni de Almeida Coelho, Mariana Escobar Wilson White, Alexandre Novaes Zerbini
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	boto conservation distance sampling e-flow freshwater cetacean habitat complexity Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/f9024b3b897e4d248a5749cc84233ff6
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spelling	oai:doaj.org-article:f9024b3b897e4d248a5749cc84233ff62021-11-25T18:03:59ZDensity and Abundance Estimation of Amazonian River Dolphins: Understanding Population Size Variability10.3390/jmse91111842077-1312https://doaj.org/article/f9024b3b897e4d248a5749cc84233ff62021-10-01T00:00:00Zhttps://www.mdpi.com/2077-1312/9/11/1184https://doaj.org/toc/2077-1312The dolphins <i>Inia geoffrensis</i>—boto and <i>Sotalia fluviatilis</i>—tucuxi are threatened cetaceans inhabiting river ecosystems in South America; population numbers are still lacking for many areas. This paper provides density and abundance estimations of boto and tucuxi in 15 rivers sampled during the past nine years as part of a multinational research alliance. Visual boat-survey data collection protocols and analyses have been developed since 2012 (based on Distance Sampling methods) and recently reviewed (2019) to improve robustness and comparability. Differences across the sampled rivers and the analyzed river basins (Amazon and Orinoco) pointed to a density/population size gradient with lower densities and abundances observed in the Orinoco basin (0.9–1.5 ind./km²), passing through the eastern Amazon basin (2–5 ind./km²), and the largest numbers found at the central Brazilian Amazon (lower Purus River—2012 (14.5 boto/km², N = 7672; 17.1 tucuxi/km², N = 9238)). However, in other parts of the central Amazon, the density of dolphins was smaller than expected for high productive whitewater rivers (1–1.7 ind./km² in the Japurá and Solimões rivers). We attributed these differences to specific features of the basin (e.g., hydro-geomorphology) as well as to the cumulative effects of anthropogenic activities.Mariana PaschoaliniFernando TrujilloMiriam MarmontelFederico Mosquera-GuerraRenan Lopes PaitachHeloise Pavanato JuliãoGabriel Melo Alves dos SantosPaul André Van DammeAndré Giovanni de Almeida CoelhoMariana Escobar Wilson WhiteAlexandre Novaes ZerbiniMDPI AGarticlebotoconservationdistance samplinge-flowfreshwater cetaceanhabitat complexityNaval architecture. Shipbuilding. Marine engineeringVM1-989OceanographyGC1-1581ENJournal of Marine Science and Engineering, Vol 9, Iss 1184, p 1184 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	boto conservation distance sampling e-flow freshwater cetacean habitat complexity Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581
spellingShingle	boto conservation distance sampling e-flow freshwater cetacean habitat complexity Naval architecture. Shipbuilding. Marine engineering VM1-989 Oceanography GC1-1581 Mariana Paschoalini Fernando Trujillo Miriam Marmontel Federico Mosquera-Guerra Renan Lopes Paitach Heloise Pavanato Julião Gabriel Melo Alves dos Santos Paul André Van Damme André Giovanni de Almeida Coelho Mariana Escobar Wilson White Alexandre Novaes Zerbini Density and Abundance Estimation of Amazonian River Dolphins: Understanding Population Size Variability
description	The dolphins <i>Inia geoffrensis</i>—boto and <i>Sotalia fluviatilis</i>—tucuxi are threatened cetaceans inhabiting river ecosystems in South America; population numbers are still lacking for many areas. This paper provides density and abundance estimations of boto and tucuxi in 15 rivers sampled during the past nine years as part of a multinational research alliance. Visual boat-survey data collection protocols and analyses have been developed since 2012 (based on Distance Sampling methods) and recently reviewed (2019) to improve robustness and comparability. Differences across the sampled rivers and the analyzed river basins (Amazon and Orinoco) pointed to a density/population size gradient with lower densities and abundances observed in the Orinoco basin (0.9–1.5 ind./km²), passing through the eastern Amazon basin (2–5 ind./km²), and the largest numbers found at the central Brazilian Amazon (lower Purus River—2012 (14.5 boto/km², N = 7672; 17.1 tucuxi/km², N = 9238)). However, in other parts of the central Amazon, the density of dolphins was smaller than expected for high productive whitewater rivers (1–1.7 ind./km² in the Japurá and Solimões rivers). We attributed these differences to specific features of the basin (e.g., hydro-geomorphology) as well as to the cumulative effects of anthropogenic activities.
format	article
author	Mariana Paschoalini Fernando Trujillo Miriam Marmontel Federico Mosquera-Guerra Renan Lopes Paitach Heloise Pavanato Julião Gabriel Melo Alves dos Santos Paul André Van Damme André Giovanni de Almeida Coelho Mariana Escobar Wilson White Alexandre Novaes Zerbini
author_facet	Mariana Paschoalini Fernando Trujillo Miriam Marmontel Federico Mosquera-Guerra Renan Lopes Paitach Heloise Pavanato Julião Gabriel Melo Alves dos Santos Paul André Van Damme André Giovanni de Almeida Coelho Mariana Escobar Wilson White Alexandre Novaes Zerbini
author_sort	Mariana Paschoalini
title	Density and Abundance Estimation of Amazonian River Dolphins: Understanding Population Size Variability
title_short	Density and Abundance Estimation of Amazonian River Dolphins: Understanding Population Size Variability
title_full	Density and Abundance Estimation of Amazonian River Dolphins: Understanding Population Size Variability
title_fullStr	Density and Abundance Estimation of Amazonian River Dolphins: Understanding Population Size Variability
title_full_unstemmed	Density and Abundance Estimation of Amazonian River Dolphins: Understanding Population Size Variability
title_sort	density and abundance estimation of amazonian river dolphins: understanding population size variability
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/f9024b3b897e4d248a5749cc84233ff6
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Density and Abundance Estimation of Amazonian River Dolphins: Understanding Population Size Variability

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