Biology of the skates Bathyraja brachyurops and B. griseocauda in waters around the Falkland Islands, Southwest Atlantic

Arkhipkin, Alexander I.; Baumgartner, Nina; Brickle, Paul; Laptikhovsky, Vladimir; Pompert, J.; Shcherbich, Zhanna

doi:10.1093/icesjms/fsn015

Cited by 30 publications

(33 citation statements)

References 14 publications

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“…Many skate species are spatially segregated because of distinct patterns of habitat use (Arkhipkin et al 2008), and our results show some evidence for potential thermal limits to northerly and southerly distributions of the D. batis clades (figure 4). These analyses are based on surface water temperatures, which may not be representative of sea bottom temperature during summer months when the shelf seas become seasonally stratified.…”

Section: Discussionmentioning

confidence: 58%

Molecular markers reveal spatially segregated cryptic species in a critically endangered fish, the common skate (Dipturus batis)

et al. 2010

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Many sharks and skates are particularly vulnerable to overfishing because of their large size, slow growth, late maturity and low fecundity. In Europe dramatic population declines have taken place in common skate (Dipturus batis L.), one of the largest demersal fish in regional shelf seas, leading to extirpations from substantial parts of its former range. Here we report the discovery of cryptic species in common skate collected from the northeast Atlantic continental shelf. Data from nuclear microsatellite markers indicated two clearly distinct clades and phylogenetic analysis of mitochondrial DNA sequences demonstrated monophyly of each one of them. Capture locations showed evidence of strong spatial segregation, with one taxon occurring mainly in waters off the southern British Isles and around Rockall, while the other was restricted to more northerly shelf waters. These apparently cryptic species showed overlapping substrate and depth preferences, but distributional limits were closely related to temperature gradients, potentially indicating thermal limits to their distributions. This discovery of hidden diversity within a large, critically endangered marine vertebrate demonstrates how marine biodiversity can be underestimated, even in such a relatively well-studied and heavily exploited region.

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Section: Discussionmentioning

confidence: 58%

Molecular markers reveal spatially segregated cryptic species in a critically endangered fish, the common skate (Dipturus batis)

et al. 2010

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“…skates and sharks) reproductive habitat where eggs are deposited and juveniles spend their early life. To describe the habitat, terms used for egg deposition sites include ‘breeding ground’ (Orton, ), ‘beds’ (Clark, ; Hitz, ), ‘oviposition areas’ (McLaughlin & O'Gower, ), ‘deposition grounds’ (Teshima & Tomonaga, ), ‘egg deposition sites’ (Able & Flescher, ; Ellis & Shackley, ), ‘egg case laying areas’ (Mabragana et al , ), ‘spawning grounds’ (Arkhipkin et al , ; Henry et al , ) and ‘egg laying grounds’ (Maia et al , ). Recently (beginning in c .…”

Section: Introductionmentioning

confidence: 99%

Identification of multiple nursery habitats of skates in the eastern Bering Sea

Hoff

2016

Journal of Fish Biology

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The use of more than a single nursery habitat type is examined for oviparous elasmobranchs using data summarized from studies conducted on the Alaska skate Bathyraja parmifera and the Aleutian skate Bathyraja aleutica in the eastern Bering Sea. The eastern Bering Sea skate species use two discrete areas as nurseries, one for egg deposition and a second for newly emergent juveniles. Egg deposition sites were located along the outer shelf and upper slope near canyons in the eastern Bering Sea. Newly emergent juveniles were found along the outer and middle shelf for B. parmifera and deep-slope for B. aleutica, suggesting that habitat used by newly emergent juvenile skates is distinct from habitat used for egg deposition and embryo development. In reviewing many studies on oviparous elasmobranchs, similar patterns emerge of habitat use during their early life history. To distinguish these distinct habitats, appropriate terminology is proposed. Egg case nursery is suggested for areas of egg deposition and juvenile nursery is suggested for areas where juveniles aggregate after emergence. Criteria to describe each habitat type are outlined.

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“…López et al, 1989;Compagno, 1999b;Knoff et al, 2001b;Knoff et al, 2002;López et al, 2002;Oyarzún et al, 2003;Knoff et al, 2004;Cedrola et al, 2005;Compagno, 2005a;Kyne & Simpfendorfer, 2007;Lamilla & Massa, 2007;Menni & Lucifora, 2007;Reyes & Torres-Flores, 2008;Muniz-Pereira et al, 2009;Quiroga et al, 2009;Kyne & Simpfendorfer, 2010;Menni et al, 2010. Stehmann, 1978;Mould, 1997;McEachran & Dunn, 1998;Menni & Stehmann, 2000;Gomes & Picado, 2001;Soto & Mincarone, 2001;Knoff et al, 2001a;Nion et al, 2002;Lamilla & Sáez, 2003;Smith et al, 2004;Céspedes et al, 2005;Compagno, 2005b;Lamilla, 2005;Lamilla & Bustamante, 2005;Lamilla et al, 2006;Licandeo et al, 2006;Bovcon & Cochia, 2007;Ebert & Compagno, 2007;Cousseau et al, 2007;Melo et al, 2007;Arkhipkin et al, 2008;Díaz de Astarloa et al, 2008;D...…”

Section: Order Rajiformes Berg 1940unclassified

“…A variety of mineralised structures may be used for age and growth estimation in chondrichthyans, i.e., vertebrae (Francis et al, 2001;Gedamke et al, 2005;Ainsley et al, 2014;Natanson et al, 2014), dermal denticles (Moura et al, 2004;Campana et al, 2006;Serra-Pereira et al, 2008), and caudal thorns (Henderson et al, 2004;Francis & Ó Maolagáin, 2005;Arkhipkin et al, 2008;Francis & Gallagher, 2009). A popular ageing technique in elasmobranch is the sagittal-sectioning of vertebral centra from the thoracic region (Cailliet et al, 2006).…”

Section: Age Growth and Longevitymentioning

confidence: 99%

“…The estimated maximum age of D. trachyderma in Chilean waters, determined through the use of the same vertebral -40-analytical approach as for Z. chilensis is 26 years for females and 25 years for males , which is consistent with an estimated maximum age of 27 years for the sexes combined (Céspedes et al, 2005) (Table 2). Other large skate species, such as Bathyraja griseocauda (Arkhipkin et al, 2008), D. batis (Du Buit, 1972), D. innominatus (Francis et al, 2001), Raja binoculata and R. rhina (McFarlane & King, 2006) also live to over 20 years of age. The concern is that larger species that have slow growth rates and are long lived are particularly vulnerable to population collapse, as has been suggested for Z. chilensis (Agnew et al, 2000;Bustamante et al, 2012).…”

Section: Age Growth and Longevitymentioning

confidence: 99%

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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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Biology of the skates Bathyraja brachyurops and B. griseocauda in waters around the Falkland Islands, Southwest Atlantic

Cited by 30 publications

References 14 publications

Molecular markers reveal spatially segregated cryptic species in a critically endangered fish, the common skate (Dipturus batis)

Molecular markers reveal spatially segregated cryptic species in a critically endangered fish, the common skate (Dipturus batis)

Identification of multiple nursery habitats of skates in the eastern Bering Sea

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

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