Estimating the isotopic niche of males and females of false killer whales (<scp><i>Pseudorca crassidens</i></scp>) from Magellan Strait, Chile

Haro, Daniela; Riccialdelli, Luciana; Blank, Olivia; Matus, Ricardo; Sabat, Pablo

doi:10.1111/mms.12564

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…Among delphinid species, the bottlenose dolphin Tursiops truncatus and Pseudorca crassidens presented 13 C- and 15 N-enriched collagen reflecting their high trophic position in this tropical food web. 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 .…”

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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“…Short‐finned pilot whales off North Carolina exhibit different dive patterns with males performing the deeper dives than females, lending support to foraging niches between sexes in at least one population (Quick et al, 2017). Sex‐based prey differentiation was also preliminarily detected from a small sample of skin stable isotopes in false killer whales off Chile, indicating that females had higher trophic niches than males (Haro et al, 2019). The presence of foraging niches would further support the benefits of prey sharing seen in false killer whales (Baird, 2009).…”

Section: Discussionmentioning

confidence: 98%

Sexually dimorphic characteristics of short‐finned pilot whales, false killer whales, pygmy killer whales, and melon‐headed whales assessed using fin and body morphometrics from photographs taken at sea

Yahn

Baird

Mahaffy

et al. 2022

Marine Mammal Science

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Adults of many free-ranging delphinid species cannot be reliably sexed at sea. Sexually mature, known-sex adult short-finned pilot, pygmy killer, melon-headed, and false killer whales were profiled from at-sea photos to assess proportional fin and body dimorphism. Males of all four species had larger dorsal fins proportional to anterior body length. False killer whales showed no further dimorphism, while melon-headed whales showed subtle dimorphism in dorsal fin overhang. Pygmy killer whales showed subtle dimorphism in lateral positioning of the top-most point and overhang. Lastly, short-finned pilot whales showed strong dimorphism in the leading edge, lateral positioning of the top-most point, and height of the overhang. Generalized linear models showed strong predictive accuracy for pilot and false killer whales, and moderate accuracy for pygmy killer and melon-headed whales. Results indicate that adult shortfinned pilot and false killer whales can be accurately sexed in the field or via morphometrics. Adult pygmy killer and melon-headed whales have subtle sexual dimorphism that can be detected using morphometrics. The presence of dimorphism gives insight into potential reproductive strategies and social structure. Further analysis is needed to explore morphometric differences between inshore and

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“…For example, genetic data of some of the samples obtained through this collaboration have been included in two Master's theses focused on long-finned pilot whales and sei whales [58,59] and two peer-reviewed publications [13,26]. Stranding samples have also contributed in other study areas, for example, stable isotope analyses [60] and toxicological analyses of trace elements and harmful algal blooms [25,61]. In turn, the long-term application of these protocols and the studies that arise from this can produce data that inform and improve future tasks in the management and conservation of cetaceans in Chile.…”

Section: Multidisciplinary Approach and Inter-institutional Collabora...mentioning

confidence: 99%

Genetic Analysis as a Tool to Improve the Monitoring of Stranded Cetaceans in Chile

Kraft

Rodríguez

Olavarría

et al. 2023

Biology

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Cetacean strandings are a valuable source of information for several studies from species richness to conservation and management. During the examination of strandings, taxonomic and sex identification might be hindered for several reasons. Molecular techniques are valuable tools to obtain that missing information. This study evaluates how gene fragment amplification protocols can support the records of strandings done in the field in Chile by identifying, corroborating, or correcting the identification of the species and sex of the recorded individuals. Through a collaboration between a scientific laboratory and government institution in Chile, 63 samples were analyzed. Thirty-nine samples were successfully identified to the species level. In total, 17 species of six families were detected, including six species of conservation interest. Of the 39 samples, 29 corresponded to corroborations of field identifications. Seven corresponded to unidentified samples and three to corrected misidentifications, adding up to 28% of the identified samples. Sex was successfully identified for 58 of the 63 individuals. Twenty were corroborations, 34 were previously unidentified, and four were corrections. Applying this method improves the stranding database of Chile and provides new data for future management and conservation tasks.

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Estimating the isotopic niche of males and females of false killer whales (Pseudorca crassidens) from Magellan Strait, Chile

Cited by 6 publications

References 43 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

Sexually dimorphic characteristics of short‐finned pilot whales, false killer whales, pygmy killer whales, and melon‐headed whales assessed using fin and body morphometrics from photographs taken at sea

Genetic Analysis as a Tool to Improve the Monitoring of Stranded Cetaceans in Chile

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