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- Resurrection and redescription of Squalus suckleyi (Girard, 1854) from the North Pacific, with comments on the Squalus acanthias subgroup (Squaliformes: Squalidae),
- A taxonomie re-evaluation of the status of the North Pacific Squalus suckleyi (Girard, 1854) combining the use of meristie, morphological and molecular data reveal this species to be clearly distinct from the widespread Squalus acanthias (Linneaus, 1758). Differences in the external morphology between S. acanthias and S. suckleyi are subtle and are likely to be masked by intraspecific variation within individuals. However, we found S. suckleyi to differ from S.acanthias based on the following morphological and meristic characteristics: a short, broadly-rounded to acute snout;first dorsal-fin midpoint more posterior to pectoral-fin insertion; pelvic-fin origin closer to second dorsal fin than first dorsal fin; total vertebral counts average 99 (97-106). Molecular analysis of approximately 650 bp of the CO1 mitochondrial gene (DNA barcode region) showed separation of S. suckleyi and S. acanthias into two distinct genetic clades with 98% bootstrap support. Within species genetic diversities were 0.109±0.036% and 0.176±0.041% for S.suckleyi and S. acanthias respectively; between species diversity was 5- 6 fold greater at 0.765+0.307%. Squalussuckleyi is thus resurrected and a neotype for this endemic North Pacific Squalus species is designated. Copyright © 2010 Magnolia Press., Cited By (since 1996):20, ,
- Ebert, White, Goldman, Compagno, Daly-Engel, Ward
- Preface: Feeding ecology of elasmobranchs
- Elasmobranchs are apical predators in most marine communities where they occur, often playing a substantial role in the food web dynamics of those communities. However, despite their high trophic status they are often poorly studied compared to most commercially important teleosts. Furthermore, despite efforts towards ecosystem-based management, elasmobranchs are still often lumped into generic categories referred to as "shark" or "skate" unclassified, with limited effort to identify individual species. The role of elasmobranchs in ecosystems has never been more important to our understanding of marine ecology due to high levels of exploitation of many species. Similar to other high trophic level predators, many elasmobranchs have life-history characteristics that make them vulnerable to over-exploitation. Elasmobranch populations are now heavily targeted in many fisheries throughout the world. Increasing exploitation of this group is especially alarming because their feeding ecology is poorly studied and by extension their influence in shaping ecosystems. Given recent increased attention on elasmobranchs in the scientific literature, management and conservation circles, and the general news media, researchers over the past decade have begun to more closely examine the ecological role of this important taxon of fishes. Due to this increasing awareness, and the development of new and innovative methods and analytical techniques, it prompted us to organize an international symposium on the "Feeding Ecology of Elasmobranchs". The symposium was held on 10 July 2010, in conjunction with the 27 th annual meeting of the American Elasmobranch Society meetings in Providence, Rhode Island. © 2012 Springer Science+Business Media B.V.
- Ebert, McElroy, White