Results 61 to 70 of about 656 (162)

Evidence of very low genetic diversity of cuban gar (Atractosteus tristoechus)/ Evidencia de pobre diversidad genética del manjuarí (Atractosteus tristoechus)

Revista de Investigaciones Marinas, 2016
The Cuban gar (Atractosteus tristoechus) is an endemic freshwater fish species of Cuba. Among the Lepisosteiformes, this species is one of the most threatened and has the lowest natural distribution range.
Gabriela Ulmo-Díaz, Jessy Castellanos-Gell, José Luis Ponce de León, Didier Casane, Andrés Hurtado, Erik García-Machado   +5 more
doaj  

Ostéologie et relations phylogénétiques de Steurbautichthys ("Pholidophophorus") aequatorialis gen. nov. (Teleostei, "Pholidophoriformes") du Jurassique moyen de Kisangani, en République Démocratique du Congo [PDF]

, 2011
The osteology of Steurbautichthys ("Pholidophorus") aequatorialis gen. nov. from the Middle Jurassic of Kisangani (Stanleyville Formation, Songa Limestones) in the Democratic Republic of Congo is studied in detail.
Taverne, L.
core  

Form and function of anguilliform swimming

Biological Reviews, Volume 99, Issue 6, Page 2190-2210, December 2024.
ABSTRACT Anguilliform swimmers are long and narrow animals that propel themselves by undulating their bodies. Observations in nature and recent investigations suggest that anguilliform swimming is highly efficient. However, understanding the underlying reasons for the efficiency of this type of locomotion requires interdisciplinary studies spanning ...
Vincent Stin, Ramiro Godoy‐Diana, Xavier Bonnet, Anthony Herrel   +3 more
wiley   +1 more source

Darwin, Haeckel, and the “Mikluskan gas organ theory”

Developmental Dynamics, Volume 253, Issue 4, Page 370-389, April 2024.
Abstract A previously unknown reference to the Russian ethnologist, biologist, and traveler Nikolai N. Miklucho‐Maclay (1846–1888) was discovered in correspondence between Charles Darwin (1809–1882) and Ernst Haeckel (1834–1919). This reference has remained unknown to science, even to Miklucho‐Maclay's biographers, probably because Darwin used the ...
Ingmar Werneburg, Uwe Hoßfeld, Georgy S. Levit   +2 more
wiley   +1 more source

Global introductions and environmental impacts of freshwater megafish

Global Change Biology, Volume 30, Issue 4, April 2024.
Of the 134 extant freshwater megafish species, 46% have been introduced outside of their native ranges. Over 50% of the alien megafish species with sufficient data to evaluate the severity of their environmental impacts have caused population declines or even extirpations of native species.
Xing Chen, Thomas G. Evans, Jonathan M. Jeschke, Sonja C. Jähnig, Fengzhi He   +4 more
wiley   +1 more source

A new approach to predicting environmental transfer of radionuclides to wildlife: A demonstration for freshwater fish and caesium [PDF]

, 2013
The application of the concentration ratio (CR) to predict radionuclide activity concentrations in wildlife from those in soil or water has become the widely accepted approach for environmental assessments.
Andersson, P., Beresford, N. A., Fesenko, S., Muikku, M., Willey, N. J., Willey, Neil, Wood, M. D., Yankovich, T. L.   +7 more
core   +4 more sources

Late Cretaceous continental and marine vertebrate assemblages of the Laño Quarry (Basque-Cantabrian Region, Iberian Peninsula): an update [PDF]

The vertebrate-bearing beds of the Laño quarry (Condado de Treviño) are among the most relevant sites from the Late Cretaceous of Europe. Geologically, Laño and the adjacent region are set on the southern limb of the South-Cantabrian Synclinorium (SE ...
Astibia, H., Badiola, A., Bardet, N., Berreteaga, A., Buffetaut, E., Buscalioni, A.D., Cappetta, H., Cavin, L., Corral, J.C., Díez Díaz, V., Gheerbrant, E., Murelaga, X., Ortega, F., Pereda-Suberbiol, X., Poyato-Ariza, F., Pérez-García, A., Rage, J.-C., Sanz, J.L., Torices, A.   +18 more
core   +2 more sources

Cariotipo del pejelagarto tropical Atractosteus tropicus (Lepisosteiformes: Lepisosteidae) y variación cromosómica en sus larvas y adultos

Revista de Biología Tropical, 2009
El cariotipo del pejelagarto Atractosteus tropicus se describe por medio de tinción Giemsa de 295 preparaciones cromosómicas en mitosis a partir de 120 larvas y 15 adultos (5 hembras y diez machos) de la población que habita en Tabasco, sureste de México.
Lenin Arias-Rodríguez, Salomón Páramo-Delgadillo, Wilfrido M Contreras-Sánchez, Carlos A Álvarez-González   +3 more
doaj  

Permanent germinal epithelium and reproductive cycle of Atractosteus tropicus (Lepisosteiformes: Lepisosteidae) males, Tabasco, Mexico.

Revista de biologia tropical, 2016
A. tropicus tiene un papel ecológico importante, como regulador de otras poblaciones de peces, en los cuerpos de agua de México, pero sus poblaciones silvestres se reducen. Una alternativa de conservación es el cultivo, el cual requiere caracterizar el ciclo reproductivo por medio del estudio de estructuras germinales y somáticas de los testículos ...
Otilio Méndez-Marin, Arlette Amalia Hernández Franyutti, Carlos Alfonso Álvarez-González, Mari Carmen Uribe, Wilfrido Miguel Contreras-Sánchez   +4 more
openaire   +4 more sources

Ostéologie et relations de Ligulella (Halecostomi, Ligulelliformes nov. ord.), poisson du Jurassique moyen de Kisangani (Formation de Stanleyville) en République Démocratique du Congo [PDF]

, 2011
The osteology of Ligulella, a very small halecostome fish from the Middle Jurassic of Kisangani (Stanleyville Formation) in the Democratic Republic of Congo, is studied in detail on the basis of more than 100 specimens.
Taverne, L.
core