Coordinated feeding behavior of the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae), in southeastern Brazil: a comparison between populations

Oliveira, Elaine C. da S.; Tardin, Rodrigo H.; Poletto, Fabiana Rios; Simão, Sheila M.

doi:10.1590/s1984-46702013005000013

Cited by 11 publications

(5 citation statements)

References 18 publications

(20 reference statements)

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“…It is expected in cetaceans due to their social behaviour, which includes long-term parental care and developed feeding strategies (e.g. Rendell & Whitehead, 2001; Perrin et al ., 2009; Tardin et al ., 2011; Oliveira et al ., 2013). In addition, animals with larger body size are able to ingest larger prey than smaller ones (Segura et al ., 2015).…”

Section: Discussionmentioning

confidence: 99%

Isotopic niche of two coastal dolphins in a tropical marine area: specific and age class comparisons

Beneditto

Monteiro

2015

J. Mar. Biol. Ass.

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Niche differentiation is the process by which species evolve different forms of resource use, and is used to explain the co-occurrence in a variety of habitats. The Bayesian framework of isotopic niche through quantitative niche metrics was applied to estimate and compare the niche breadth of two sympatric coastal dolphins Pontoporia blainvillei and Sotalia guianensis in a tropical marine area. The standard ellipse areas (SEAs) based on species were quite similar, but the SEAs based on age class showed that the matures’ niche space is larger than the immatures’ for both dolphins. A probabilistic comparison of SEAs indicated that specific differences are negligible compared with age class differences. Trophic level measures (δ15N range) indicated that the dolphins are comparable as top predators, and that immature specimens have a lower range of trophic levels than mature ones. In terms of variability of food sources (δ13C range), S. guianensis showed a larger value than P. blainvillei and mature specimens had larger δ13C range than immatures for both species. In general, P. blainvillei and S. guianensis were similar in the niche metrics, with SEAs overlap of 52.1 and 39.7%. The immature specimens showed reduced isotopic niche overlap between species (<3%). In conclusion, Pontoporia blainvillei and S. guianensis specimens have similar isotopic niches, but pronounced differences between immature and mature specimens, both intraspecific and interspecific. Isotopic niche and quantitative metrics along with previous data on stomach contents provide a strong representation of species niche and their relationships.

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Section: Discussionmentioning

confidence: 99%

Isotopic niche of two coastal dolphins in a tropical marine area: specific and age class comparisons

Beneditto

Monteiro

2015

J. Mar. Biol. Ass.

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“…While many of the data included here have already been published (e.g. Figueiredo & Simão, 2009; Oliveira et al, 2013; Maciel et al, 2020), the raw data were used here for analysis. All the statistical analyses were conducted in R (R Development Core Team, 2021).…”

Section: Methodsmentioning

confidence: 99%

“…Interactions between dolphins, involving a variety of vigorous activities, including leaping out of the water, wave riding, body contact and sexual interactions, such as the 'belly-to-belly' position (Karczmarski, Cockcroft & McLachlan, 1999) Travel Continuous swimming movement in a specific direction (Karczmarski, Cockcroft & McLachlan, 1999) Rest Low activity levels, dolphins floating stationary and motionless at the surface, with some occasional slow forward movement (Karczmarski, Cockcroft & McLachlan, 1999) Forage Searching for food with random movements, generally with no specific direction, including frequent asynchronous diving, searching for prey (Karczmarski, Cockcroft & McLachlan, 1999) Feed Coordinated surface behaviour in order to prey. Usually include coordinated feeding tactics such as wall formation, perpendicular feeding, kettle and line abreast behaviour (Oliveira et al, 2013) T A B L E 2 The number of groups of Guiana dolphin sighted and the sampling effort employed during each time series in Sepetiba Bay, southeastern Brazil. F I G U R E 2 Sepetiba Bay, southeastern Brazil, showing the Guiana Dolphin MPA, areas of shipping and industrial use, and survey sampling effort in 1 km grid squares for the historical (1998, 1999, 2001, 2002, 2006 and 2007) and current (2017-2019) time series.…”

Section: Socio-sexual Interactionmentioning

confidence: 99%

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20 years of research on the Guiana dolphin population of Sepetiba Bay, southeastern Brazil: What has changed?

Maciel,

Maricato,

Marqui

et al. 2023

Aquatic Conservation

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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.

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“…Toothed whales and dolphins, due to their durable social alliances (often involving related individuals) exhibit a remarkable diversity of what is often described as cooperative feeding behavior (e.g., Benoit‐Bird & Au, 2009; Engleby & Powell, 2019; Oliveira et al, 2013; Pitman & Durban, 2012; Rossi‐Santos & Flores, 2009; Similä & Ugarte, 1993; Würsig, 1986). Baleen whales, on the other hand, are often solitary (Mann & Karnisky, 2017), and even when they do aggregate where prey is abundant, they tend to feed independently (Kot et al, 2014; Tershy et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Cooperative feeding and foraging lateralization by Eden's whales off southern China

Chen

Ballance

et al. 2022

Marine Mammal Science

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Coordinated feeding behavior of the Guiana dolphin, Sotalia guianensis (Cetacea: Delphinidae), in southeastern Brazil: a comparison between populations

Cited by 11 publications

References 18 publications

Isotopic niche of two coastal dolphins in a tropical marine area: specific and age class comparisons

Isotopic niche of two coastal dolphins in a tropical marine area: specific and age class comparisons

20 years of research on the Guiana dolphin population of Sepetiba Bay, southeastern Brazil: What has changed?

Cooperative feeding and foraging lateralization by Eden's whales off southern China

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