Description and quantitative analysis of the dentition of the southern thorny skate <i><scp>A</scp>mblyraja doellojuradoi</i>

Delpiani, Gabriela; Spath, M. C.; Antoni, Mariana Deli; Delpiani, Matías

doi:10.1111/jfb.13295

Cited by 1 publication

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References 34 publications

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“…In both skates and rays, a change dental morphology occurs as a secondary sexual characteristic that is related to the males' need to be able to firmly grip the females' pectoral fin in their mouth for mating (Kajiura & Tricas, 1996;Sáez & Lamilla, 1997;Gutteridge & Bennett, 2014;Belleggia et al, 2016;Delpiani et al, 2017). The change in jaw and dental morphology is presumably related, functionally to hypertrophy of the mandibular abductor muscle.…”

Section: Morphological Cues Of Longnose Skatesmentioning

confidence: 99%

Skate-ing on thin ice: molecular ecology of longnose skates in the Southeast Pacific Ocean

Vargas-Caro¹

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Longnose skates may be one of the most vulnerable taxa of elasmobranch fishes, with documented local extinctions and population declines worldwide. Longnose skates are the main component of the commercial elasmobranch fisheries in the south-east Pacific Ocean, especially in Chilean waters where target and bycatch fisheries have led two species to the brink of collapse. The yellownose skate Zearaja chilensis and the roughskin skate Dipturus trachyderma are endemic of southern South America yet little is known about population ecology and stock structure.Additionally, the external morphology of longnose skates is remarkably similar, especially in early life stages, and a lack of accurate species identification has compromised official landings records which in turn has impacted fishery management. Overall abundance of longnose skates has declined substantially over the last decade due to intensive fishing pressure and the fishery is considered to be `fully exploited'.Based on all available information in peer-reviewed and grey literature, a comparative synthesis of the biology and ecology was conducted on Z. chilensis and D. trachyderma. A positive increase in relation to scientific knowledge over the past decade was noticeable, although several basic aspects of their biology and ecology are still missing. There is an urgent need to fill knowledge gaps on, for example, movement patterns, feeding ecology and habitat use, population size and structure, and levels of connectivity. In this study, taxonomic clarity was provided, and relevant information with regard to the biology, ecology and fisheries that interact with longnose skates was collated.Confusion of identity between longnose skates occurs to the present day. In order to address this issue, morphometric and genetic tools are provided to aid in species identification of early-life stage specimens. Thirty-seven morphometric measurements and three meristic characters were used to identify specimens. These results suggest that the number of midline, nuchal and inter-dorsal thorns could be used to discriminate between specimens of Z. chilensis and D. trachyderma. Previously, the presence of a single nuchal thorn was considered to be a feature that could be used to separate species, however, this morphological feature has proven to be variable in Z. chilensis. Additionally, partial sequences of the 16S, cox1, nadh2 and the control regions of the mitochondrial DNA were amplified and analysed for intraspecific and interspecific divergence. Amplified fragments of cox1 gene and the control region contained information to separate the target species; however, specimens of D. trachyderma and Z. chilensis were grouped indistinctly within a single clade using 16S and nadh2 fragments.-iiiThe evolutionary history of Zearaja was also explored, in a broad taxonomic context by using whole mitochondrial genomes (mitogenomes) to understand higher-level phylogenetic relationships among batoids. A data set of 56 mitogenomes of 47 batoids and four outgroups was analysed. O...

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Section: Morphological Cues Of Longnose Skatesmentioning

confidence: 99%

Skate-ing on thin ice: molecular ecology of longnose skates in the Southeast Pacific Ocean

Vargas-Caro¹

View full text Add to dashboard Cite

show abstract

Description and quantitative analysis of the dentition of the southern thorny skate Amblyraja doellojuradoi

Cited by 1 publication

References 34 publications

Skate-ing on thin ice: molecular ecology of longnose skates in the Southeast Pacific Ocean

Skate-ing on thin ice: molecular ecology of longnose skates in the Southeast Pacific Ocean

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