Rough-Toothed Dolphins (Steno bredanensis) Along Southeastern Brazil: Report of an Anomalous Pigmented Juvenile and Description of Social and Feeding Behaviors

Cardoso, Júlio; Francisco, Arlaine; Souza, Shirley Pacheco de; Siciliano, Salvatore

doi:10.1578/am.45.1.2019.30

Cited by 9 publications

(5 citation statements)

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“…Both species are considered mainly piscivorous, and as such, they exhibit high trophic levels within pelagic food webs 73 − 75 . Steno bredanensis is considered an offshore species in Southeastern Brazil 76 , although regularly sighted in shallow bays and other coastal areas 77 . Increased stranding events and fishermen reports on T. truncatus and S. bredanensis reinforces their regular presence off Northern Brazil 39 , 48 , mostly associated with negative interactions with artisanal fisheries.…”

Section: Discussionmentioning

confidence: 99%

Resource partitioning among stranded aquatic mammals from Amazon and Northeastern coast of Brazil revealed through Carbon and Nitrogen Stable Isotopes

Costa

Botta

Siciliano

et al. 2020

Sci Rep

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Aquatic mammals play an important role in community structure. The present study applied stable isotope analysis (SIA) to evidence trophic relationships and resource partitioning among aquatic mammals inhabiting different environments in the Amazon estuarine complex and adjacent coastal zone (AE) and Northeastern coast (NC) of Brazil. In addition, isotopic niche partitioning among Sotalia guianensis , Inia spp. and Trichechus inunguis within the AE was also evaluated, and ecological S. guianensis stocks were characterized. Among marine delphinids, the carbon isotopic composition in offshore species mirrored that of nearshore species, contradicting the pattern of decreasing δ 13 C values characteristic of many areas around the world including areas in Southeastern and Southern Brazil. Isotopic niches were highly distinct, with no overlap among the assessed species inhabiting the AE. Inia spp. and T. inunguis occupied significantly larger isotopic niche spaces, suggesting high habitat plasticity. S. guianensis inhabited two coastal regions indicating an ecological distinction. Nitrogen values were similar between S. guianensis from the NC and AE, indicating comparable trophic positions. However, NC specimens presented more variable δ 13 C values compared to those from AE. SIA results also allowed for insights concerning habitat use and the trophic ecology of dolphin species inhabiting different oceanographic regions off Northern/Northeast Brazil. These findings provide novel data on the stable isotope composition for cetaceans and sirenians from this region, and aid in furthering knowledge on the trophic ecology and habitat use of the investigated species.

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Section: Discussionmentioning

confidence: 99%

Resource partitioning among stranded aquatic mammals from Amazon and Northeastern coast of Brazil revealed through Carbon and Nitrogen Stable Isotopes

Costa

Botta

Siciliano

et al. 2020

Sci Rep

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“…There have been at least seven reports of hypopigmented spinner dolphins between 1970 and 1993 (Hain & Leatherwood, 1982;Fertl et al, 1999). One was an adult white spinner dolphin observed close to Panama (Fertl et al, 2004), similar to what has been reported for other odontocetes such as bottlenose dolphins (Tursiops truncatus; Pérez-Puig et al, 2019), rough-toothed dolphins (Steno bredanensis; Cardoso et al, 2019), and harbor porpoises (Phocoena phocoena; Keener et al, 2011;Robinson & Haskins, 2013;Gil et al, 2019). The present report of a spinner dolphin is the first documented case of piebaldism or focal skin disease in an odontocete in the MCP.…”

Section: Case 1 Spinner Dolphinmentioning

confidence: 55%

Observations of Hypopigmented Dolphins Sighted in Mexican and Alaskan Waters (2012-2013)

Ortega‐Ortiz¹,

Meza-Yañez²,

Calleros-Negrete³

et al. 2022

Aquat Mamm

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“…Data were obtained from photos taken in opportunistic boat sightings, between 2004 and January 2022, from the Baleia à Vista Project (ProBaV), a citizen science project that monitors the waters off the northern coast of the state of São Paulo, Brazil, near the Ilhabela Archipelago (23 48.735 0 S, 45 22.019 0 W) (Cardoso et al, 2019). Bryde's whales were identified by three prominent ridges located in front of the blowhole, and individuals were photo-identified using distinctive dorsal fin marks and forms (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

A vessel collision report for Bryde's whales (Balaenoptera brydei) off the northern coast of São Paulo, Brazil

Athayde¹,

Cardoso²,

Francisco³

et al. 2022

Aquatic Conservation

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Vessel collisions are an important threat to several cetacean species, both large and small. In addition to negatively affecting the animals themselves, collisions can also damage or sink vessels, threatening both human safety and marine industry economics. Larger cetaceans seem to be the most affected by vessel collisions, and vessel strikes with Bryde's whales (Balaenoptera brydei/Balaenoptera edeni) have been reported worldwide. Long‐term photo‐identification research on Bryde's whales off the northern coast of the state of São Paulo, Brazil, has been continuing since 2016. Of the 67 individuals that were photo‐identified between 2004 and January 2022, three (4%) presented scars compatible with injuries from vessel propellers. These data contribute towards an understanding of the long‐term effects of collision injuries on the behaviour and survival of Bryde's whales. This report is intended to help inform the future evaluation of the conservation status of B. brydei off Brazil.

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Rough-Toothed Dolphins (Steno bredanensis) Along Southeastern Brazil: Report of an Anomalous Pigmented Juvenile and Description of Social and Feeding Behaviors

Cited by 9 publications

References 0 publications

Resource partitioning among stranded aquatic mammals from Amazon and Northeastern coast of Brazil revealed through Carbon and Nitrogen Stable Isotopes

Resource partitioning among stranded aquatic mammals from Amazon and Northeastern coast of Brazil revealed through Carbon and Nitrogen Stable Isotopes

Observations of Hypopigmented Dolphins Sighted in Mexican and Alaskan Waters (2012-2013)

A vessel collision report for Bryde's whales (Balaenoptera brydei) off the northern coast of São Paulo, Brazil

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