Results 71 to 80 of about 6,389 (219)

Is Nematocharax (Actinopterygii, Characiformes) a monotypic fish genus? [PDF]

Genome, 2016
The combination of DNA barcodes and geometric morphometrics is useful to discriminate taxonomically controversial species, providing more precise estimates of biodiversity. Therefore, our goal was to assess the genetic and morphometric diversity in Nematocharax, a controversial monotypic and sexually dimorphic genus of Neotropical fish, based on ...
Barreto, Silvia Britto, Nunes, Lorena Andrade, da Silva, André Teixeira, Jucá-Chagas, Ricardo, Diniz, Debora, Sampaio, Iracilda, Schneider, Horacio, Affonso, Paulo Roberto   +7 more
openaire   +4 more sources

High trophic niche overlap between sympatric peacock basses (Cichliformes: Cichlidae: Cichla): Concordant findings from three dietary analysis methods

Journal of Fish Biology, EarlyView.
Abstract Dietary analysis has contributed to our understanding of animal niches, interspecific interactions, community structure and the flow of matter and energy in food webs. We employed three methods of dietary analysis to estimate trophic niche overlap between two peacock bass species, Cichla cataractae and Cichla ocellaris, across sympatric ...
Benton L. Fry, Hayden C. Roberts, Kirk O. Winemiller   +2 more
wiley   +1 more source

Dos especies nuevas de Creptotrema (Digenea: Allocreadiidae) de America del Sur

Revista Mexicana de Biodiversidad, 2008
DOS ESPECIES NUEVAS DE DIGÉNEOS PERTENECIENTES A CREPTOTREMA TRAVASSOS, ARTIGAS Y PEREIRA, 1928 FUERON DESCRITAS DE EJEMPLARES DEPOSITADOS EN LA COLECCIÓN DE INVERTEBRADOS DEL MUSEO DE HISTORIA NATURAL DE GINEBRA, SUIZA. CREPTOTREMA LAMOTHEI N. SP.
STEPHEN S. CURRAN
doaj   +1 more source

Genetic Structure and Conservation Strategies for the Endangered Catfish Steindachneridion melanodermatum (Siluriformes, Pimelodidae) in the Iguaçu River, Brazil

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 6, June 2026.
ABSTRACT The endemic catfish Steindachneridion melanodermatum from the Iguaçu River basin, southern Brazil, is one of the most threatened pimelodid species. Comprehension of its genetic structure is imperative to the formulation of long‐term efficacious conservation strategies. A genetic analysis was conducted on three populations from the lower Iguaçu
Jesús Hernández‐Gómez, Caio Felipe da Silva, Carolina de Oliveira Magalhães, Bruno Henrique Mattiello, Juliano Tupan Coragem, Ricardo Utsunomia, Fabio Porto‐Foresti, Fernanda Dotti do Prado, Roberto Ferreira Artoni   +8 more
wiley   +1 more source

Life‐History and Landscape Context Shaping the Spatial Genetic Structure of the Migratory Amazonian Fish Prochilodus nigricans

Freshwater Biology, Volume 71, Issue 6, June 2026.
ABSTRACT The Neotropical migratory fish Prochilodus nigricans plays a critical ecological and socioeconomic role in the Amazon basin. Nevertheless, little is known about its populations and the genetic diversity pattern of the species. In light of this, the current study investigates the spatial genetic structure and diversity of P.
Ueslei Lopes, Josiane Ribolli, Carolina B. Machado, Rosane Silva‐Santos, Pedro M. Galetti Jr., Patrícia D. Freitas   +5 more
wiley   +1 more source

Beyond Hard Parts: Metabarcoding Advances Dietary Resolution in Threatened Amazonian Elasmobranchs

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 5, May 2026.
ABSTRACT Elasmobranchs are highly vulnerable and are considered one of the most threatened vertebrates worldwide. Insights into diet can improve conservation measures. The bias of traditional morphological methods towards taxa with distinctive hard parts makes metabarcoding analysis a complementary tool to assess diet composition. Here, we analysed the
Alan Érik S. Rodrigues, Cintia Oliveira Carvalho, Jorge Luiz S. Nunes, Rafaela Maria S. Brito, Marcelo Ândrade, Carolina Oliveira Magalhães, Fabrício dos Anjos Santa Rosa, Audun Schrøder‐Nielsen, Hugo J. de Boer, Quentin Mauvisseau, Jonathan S. Ready, João Bráullio L. Sales   +11 more
wiley   +1 more source

Hybridization, Maternal Inheritance, and Evolutionary Time of Divergence of Endangered Species of Hypancistrus (Siluriformes: Loricariidae) in the Xingu River

Ecology and Evolution, Volume 16, Issue 5, May 2026.
We uncover recent hybridization dynamics among three endemic Hypancistrus species from the Xingu River, including the critically endangered H. zebra. Mitogenomic analyses reveal unidirectional maternal inheritance and recent evolutionary radiation (< 0.5 Ma), explaining their retained reproductive compatibility.
Franciele F. Kerniske, Bruno F. Melo, Leandro M. Sousa, Tiago M. Degrandi, Roberto F. Artoni   +4 more
wiley   +1 more source

The subunit composition of the mammalian Mediator complex is not conserved in all vertebrates: Insights from evolutionary plasticity of fish genomes

Protein Science, Volume 35, Issue 5, May 2026.
Abstract The Mediator complex is an indispensable, multi‐subunit protein transcriptional coactivator with a central role in gene expression in Eukaryotes. Among vertebrates, its molecular structure and subunit composition are well‐known only for mammals.
Radka Symonová, Thomas J. Near, Jan Kubečka   +2 more
wiley   +1 more source

Trends in chromosome evolution of neotropical characiform fishes [PDF]

Caryologia, 1994
SUMMARYNeotropical characiform fishes present two main trends of chromosomal evolution: some taxa show a heterogeneous pattern, with an extensive numerical and structural variation while others show a more homogeneous one, with a clear stability in their karyotype macrostructure.
P.M. Galetti, L.A.C. Bertollo, O. Moreira-Filho   +2 more
openaire   +1 more source

On traits matching and the modular organization of food web and occurrence networks

Journal of Animal Ecology, Volume 95, Issue 5, Page 837-850, May 2026.
What mechanisms shape ecological networks? In Paraná River piscivores, species traits and abundance scaling promote modular structures. Our findings reveal how communities self‐organize and highlight the conditions needed to sustain them. Abstract Modularity and nestedness have been observed recurrently across different ecological networks, including ...
Dalmiro Borzone Mas, Pablo A. Scarabotti, Pablo A. Vaschetto, Patricio Alvarenga, Martin Vazquez, Matías Arim   +5 more
wiley   +1 more source