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Chapter 10 Reproduction of Chondrichthyans
2020Species of the class Chondrichthyes (sharks, rays, and chimaeras) exhibit diverse reproductive modes ranging from strictly lecithotrophic oviparity to viviparity with varying matrotrophic nutritional supplement (histotrophy, ovatrophy, adelphotrophy, and placentatrophy).
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Brain Organization and Specialization in Deep-Sea Chondrichthyans
Brain, Behavior and Evolution, 2008Chondrichthyans occupy a basal place in vertebrate evolution and offer a relatively unexplored opportunity to study the evolution of vertebrate brains. This study examines the brain morphology of 22 species of deep-sea sharks and holocephalans, in relation to both phylogeny and ecology. Both relative brain size (expressed as residuals) and the relative
Kara E, Yopak, John C, Montgomery
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New biogeographical information on Queensland chondrichthyans
2005(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Kyne, P.M. +3 more
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Chondrichthyan Parity, Lecithotrophy and Matrotrophy
2011Species that exhibit histotrophy show considerable variation in the quality and quantity of uterine secretions. There is a general trend, however, from mucous to lipid histotrophy that is correlated with increased dry weight gain. There is a fine, indistinct line between lecithotrophic yolk sac viviparity and matrotrophic histotrophy.
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Is there a chondrichthyan bioaccumulation paradigm?
2006This paper is a synthesis of our current investigations to evaluate bioaccumulatory characteristics of chondrichthyans. The bioaccumulation of seven heavy metals and radionuclides (241Am, 109Cd, 57Co, 51Cr, 134Cs, 54Mn and 65Zn) from seawater were experimentally compared in the chondrichthyan Scyliorhinus canicula (spotted dogfish) and the ...
Jeffree, Ross A., Teyssie, Jean-Louis
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Extinction vulnerability of chondrichthyans
CIESM workshop monographs, 2013Chondrichthyan species make up a relatively small group that has functioned successfully in diverse ecosystems for over 400 million years surviving various ecological catastrophes, including "Big five" mass extinctions. This group may now be threatened with extinction as a result of human activities and the conservative life history characteristics of ...
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The Effects of Fishing on Chondrichthyans
2016Global fishing activity is major threat to chondrichthyan (sharks, rays and chimaeras) populations. The effects of fishing are predominantly estimated by quantifying immediate and post-capture mortality rates. However, the true effect of fishing is likely to be underestimated, because measuring the mortality rates of released animals is logistically ...
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Copepod-chondrichthyan coevolution : a cladistic consideration
2009A revision of the species of Eudactylina (Eudactylinidae : Siphonostomatoida) and Kroyeria (Kroyeriidae : Siphonostomatoida) was conducted, based on type and other specimens of parasitic copepods from museums and personal collections. A description of the external morphology of each genus is included.
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