Evaluation of periotic–timpanic bone complex of<i>Sotalia guianensis</i>(Cetacea: Delphinidae) as tool in identification of geographic variations

Arcoverde, Danilo Leal; Emin-Lima, Renata; Costa, Alexandra Fernandes; Beneditto, Ana Paula Madeira Di; Siciliano, Salvatore; Sena, Leonardo; Moreno, Ignacio B.; Silva, José de Sousa e

doi:10.1017/s0025315413001689

Cited by 4 publications

(4 citation statements)

References 23 publications

(36 reference statements)

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“…This might explain the fact that no variation could be revealed in the transverse view. Geographical differences in the middle ear of Guiana dolphins ( Sotalia guianensis ) were found in a recent study between the coasts of northern and south-eastern Brazil, which are consistent with population genetic structure 39 . The traditional morphometrics of the T-P bone complex revealed to be an efficient tool to identify geographic variations in this species.…”

Section: Discussionsupporting

confidence: 80%

Size and shape variations of the bony components of sperm whale cochleae

Schnitzler

Frederich

Früchtnicht³

et al. 2017

Sci Rep

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Several mass strandings of sperm whales occurred in the North Sea during January and February 2016. Twelve animals were necropsied and sampled around 48 h after their discovery on German coasts of Schleswig Holstein. The present study aims to explore the morphological variation of the primary sensory organ of sperm whales, the left and right auditory system, using high-resolution computerised tomography imaging. We performed a quantitative analysis of size and shape of cochleae using landmark-based geometric morphometrics to reveal inter-individual anatomical variations. A hierarchical cluster analysis based on thirty-one external morphometric characters classified these 12 individuals in two stranding clusters. A relative amount of shape variation could be attributable to geographical differences among stranding locations and clusters. Our geometric data allowed the discrimination of distinct bachelor schools among sperm whales that stranded on German coasts. We argue that the cochleae are individually shaped, varying greatly in dimensions and that the intra-specific variation observed in the morphology of the cochleae may partially reflect their affiliation to their bachelor school. There are increasing concerns about the impact of noise on cetaceans and describing the auditory periphery of odontocetes is a key conservation issue to further assess the effect of noise pollution.

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Section: Discussionsupporting

confidence: 80%

Size and shape variations of the bony components of sperm whale cochleae

Schnitzler

Frederich

Früchtnicht³

et al. 2017

Sci Rep

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“…Thus, Arcoverde et al (2014) found consistent morphological differences in the middle ear of Sotalia guianensis between the coasts of northern and south-eastern Brazil, consistent with population genetic structure.…”

supporting

confidence: 76%

“…Despite the apparent lack of physical boundaries in the marine environment, geographical differences, often at surprisingly fine spatial scales, are reflected in the morphology, phenology, behavioural ecology, diet and ultimately population genetic structure of the various marine mammals that were once thought to freely roam the oceans. Thus, Arcoverde et al (2014) found consistent morphological differences in the middle ear of Sotalia guianensis between the coasts of northern and south-eastern Brazil, consistent with population genetic structure.…”

mentioning

confidence: 58%

Marine mammal research: its relationship to other scientific disciplines and to wider society

Evans¹,

Anderwald

Wright

2014

J. Mar. Biol. Ass.

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“…Skull analyses from the north, northeast and southeast have been demonstrated a complete separation between Pará and Rio de Janeiro populations, and a partial separation between Pará, Maranhão and Piauí 98 . Analyses of the periotic-tympanic bone complex of three Brazilian regions also reported geographic variations 99 .…”

Section: Discussionmentioning

confidence: 98%

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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Evaluation of periotic–timpanic bone complex ofSotalia guianensis(Cetacea: Delphinidae) as tool in identification of geographic variations

Cited by 4 publications

References 23 publications

Size and shape variations of the bony components of sperm whale cochleae

Size and shape variations of the bony components of sperm whale cochleae

Marine mammal research: its relationship to other scientific disciplines and to wider society

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

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