Results 61 to 70 of about 15,605 (225)

First record of albinism in the smooth dogfish Mustelus Schimitti Springer, 1939 (Carcharhiniformes - Triakidae) from Southern Brazil

Brazilian Archives of Biology and Technology, 2002
This paper reports on a subadult male specimen of the smooth dogfish, Mustelus schimitti, caught in the continental shelf of Rio Grande Sul, during winter of 1993, which exhibited the characteristics of total albinism.Este trabalho registra a primeira ...
Simone Ferreira Teixeira, Maria Lúcia Góes de Araújo   +1 more
doaj   +1 more source

Evolution of a core gene network for skeletogenesis in chordates. [PDF]

PLoS Genetics, 2008
The skeleton is one of the most important features for the reconstruction of vertebrate phylogeny but few data are available to understand its molecular origin. In mammals the Runt genes are central regulators of skeletogenesis.
Jochen Hecht, Sigmar Stricker, Ulrike Wiecha, Asita Stiege, Georgia Panopoulou, Lars Podsiadlowski, Albert J Poustka, Christoph Dieterich, Siegfried Ehrich, Julia Suvorova, Stefan Mundlos, Volkhard Seitz   +11 more
doaj   +1 more source

Pigmentation disorders in three specimens of spiny dogfish, Squalus acanthias Linnaeus, 1758, from the Gulf of Venice, northern Adriatic Sea

Journal of Fish Biology, EarlyView.
Abstract This study reports three cases of pigmentation disorders in Squalus acanthias from the Gulf of Venice. Two specimens exhibited spotless phenotypes, whereas one exhibited hypermelanism. Morphological assessments were conducted for two individuals, alongside genetic analysis of mitochondrial genes to determine phylogeographic relationships. Both
Jacopo Bernardi, Licia Finotto, Giusy Catalano, Valentina Crobe, Alessia Cariani, Alice Ferrari   +5 more
wiley   +1 more source

Shark scavenging behavior in the presence of competition

Current Zoology, 2010
The distribution of organisms within a community can often be determined by the degree of plasticity or degree of specialization of resource acquisition.
Shannon P. GERRY, Andrea J. SCOTT
doaj  

Diagnosis of the richness and abundance of fish and shrimp species caught by artisanal fishermen from the Island Complex (Cananéia, Iguape and Ilha Comprida), Cananéia, SP / Brazil / Diagnóstico da riqueza e abundância de espécies de peixes e camarões capturados por pescadores artesanais do Complexo de Ilhas (Cananéia, Iguape e Ilha Comprida), Cananéia, SP/Brasil

Diversitas Journal, 2017
The study aimed to diagnose the richness and abundance of fish and shrimp of commercial use in the complex of islands Cananéia-Iguape-Ilha, through interviews with fishermen.
Katia Santos Bezerra, Renata Akemi Shinozaki Mendes², Gildemberg Alves dos Santos   +2 more
doaj   +1 more source

Evolution of axis specification mechanisms in jawed vertebrates: insights from a chondrichthyan. [PDF]

PLoS ONE, 2007
The genetic mechanisms that control the establishment of early polarities and their link with embryonic axis specification and patterning seem to substantially diverge across vertebrates.
Marion Coolen, Tatjana Sauka-Spengler, Delphine Nicolle, Chantal Le-Mentec, Yvan Lallemand, Corinne Da Silva, Jean-Louis Plouhinec, Benoît Robert, Patrick Wincker, De-Li Shi, Sylvie Mazan   +10 more
doaj   +1 more source

Myocardial trabeculation in embryos of Scyliorhinus canicula (Elasmobranchii, Chondrichthyans) [PDF]

, 2018
Currently, three types of ventricular myoarchitecture are recognized in vertebrates, namely compact, spongy (trabeculated) and mixed myocardium. Mixed myocardium, which has been recently proposed as the primitive condition in gnathostomes, is composed of
Durán-Boyero, Ana Carmen, Fernández-Corujo, Borja, Lorenzale, Miguel, López-Unzu, Miguel A., Rodríguez, Cristina   +4 more
core  

Diet of juvenile skipjack herring Alosa chrysochloris: Ontogenetic shifts, predator–prey size ratios and mouth gape allometry

Journal of Fish Biology, EarlyView.
Abstract The skipjack herring Alosa chrysochloris inhabits Gulf of Mexico drainages, primarily the Mississippi River Basin, and estuarine environments in the Gulf of Mexico. The trophic ecology of the skipjack herring is poorly understood, therefore we quantified the length, mouth gape and gut contents of juvenile skipjack herring from the Mississippi ...
Joshua P. Egan, Peter J. Hundt, Neil P. Rude, Jason A. DeBoer, Benjamin J. Lubinski, Kristopher A. Maxson, Levi E. Solomon, Andrya L. Whitten Harris, Andrew M. Simons   +8 more
wiley   +1 more source

DNA‐based identification of anadromous fishes (Alosa spp., Family Clupeidae) in stomach contents of marine groundfish

Journal of Fish Biology, EarlyView.
Abstract Using DNA techniques for prey identification is an emerging approach for enhancing the precision and accuracy of trophic information. We evaluated the effectiveness of DNA‐based prey identification in conjunction with visual stomach content analysis of commercially important groundfish in the nearshore Gulf of Maine, with a focus on ...
Landon P. Falke, Stacy Rowe, Yuan Liu, Timothy F. Sheehan   +3 more
wiley   +1 more source

Exploring intraspecific life history patterns in sharks [PDF]

, 2006
Marine ecosystems compose the major source (85%) of world fisheries production (Garcia and Newton, 1997). Although only a few fish species tend to dominate fishery catches (Jennings et al., 2001), a large diversity of fishes representing varied ...
Cope, Jason M.
core