Results 71 to 80 of about 2,449 (227)

Feeding ecology of Eigenmannia desantanai (Gymnotiformes: Sternopygidae) in southern Pantanal, Brazil

Acta Limnologica Brasiliensia, 2022
Aim This study investigated changes in the dietary composition and trophic niche breadth of Eigenmannia desantanai in the context of hydrological periods, rivers, and ontogeny.
É. J. Gouveia, P. L. Rondon, Y. Súarez
semanticscholar   +1 more source

Are NORs always located on homeologous chromosomes? A FISH investigation with rDNA and whole chromosome probes in Gymnotus fishes (Gymnotiformes). [PDF]

PLoS ONE, 2013
Gymnotus (Gymnotiformes, Gymnotidae) is the most diverse known Neotropical electric knife fish genus. Cytogenetic studies in Gymnotus demonstrate a huge karyotypic diversity for this genus, with diploid numbers ranging from 34 to 54.
Susana S R Milhomem, Priscilla C Scacchetti, Julio C Pieczarka, Malcolm A Ferguson-Smith, José C Pansonato-Alves, Patricia C M O'Brien, Fausto Foresti, Cleusa Y Nagamachi   +7 more
doaj   +1 more source

Disentangling Environmental, Spatial and Niche Influences on Fish Beta Diversity Along the Sandy Beaches of an Amazonian River

Freshwater Biology, Volume 71, Issue 7, July 2026.
ABSTRACT Beta diversity is an important descriptor of community structuring and it plays a crucial role for understanding the patterns and processes shaping biodiversity at multiple spatial extents. We investigated the influence of local, spatial, landscape factors and niche characteristics on fish beta diversity along the Acre River in Acre, Brazil ...
Ronaldo S. Silva, Lucas P. Oliveira, Naraiana L. Benone, Jean C. G. Ortega, Antonio A. Jardim Jr, Lídia B. Seabra, Fabiano Corrêa, Lisandro J. S. Vieira, Robert M. Hughes, Luciano F. A. Montag   +9 more
wiley   +1 more source

A new taxonomist-curated reference library of DNA barcodes for Neotropical electric fish (Teleostei: Gymnotiformes)

, 2022
Janzen, Francesco H, Crampton, William G R, Lovejoy, Nathan R (2022): A new taxonomist-curated reference library of DNA barcodes for Neotropical electric fish (Teleostei: Gymnotiformes).
Lovejoy, Nathan R, Crampton, William G R, Janzen, Francesco H   +2 more
core   +1 more source

Revised phylogenetic hypothesis and comparative evolution of mitochondrial genomes of Neotropical weakly electric fishes (Gymnotiformes) [PDF]

, 2020
Complete mitochondrial genomes of South American electric fishes (Gymnotiformes) have been recovered to provide a new phylogenetic hypothesis.
Alda-Pons, Fernando, Harvey, Tiffany
core   +1 more source

Fish fauna in tributaries of the Suiá-Miçú River (upper Xingu river basin), in the Cerrado-Amazon transition zone, eastern state of Mato Grosso, Brazil [PDF]

Check List, 2017
Studies on the fish fauna of the Xingu river basin are mainly concentrated in the main channel of the river or its large tributaries, due to requirements all faunal surveys in hydroelectric power plant projects.
Luciano Lima, Aline Santos, Dilermando Lima Junior   +2 more
doaj   +3 more sources

Neuromodulation of early electrosensory processing in gymnotiform weakly electric fish [PDF]

Journal of Experimental Biology, 2013
Summary Sensory neurons continually adapt their processing properties in response to changes in the sensory environment or the brain's internal state. Neuromodulators are thought to mediate such adaptation through a variety of receptors and their action has been implicated in processes such as attention, learning and memory, aggression ...
Brenda Toscano, Márquez, Rüdiger, Krahe, Maurice J, Chacron   +2 more
openaire   +2 more sources

Unraveling Temporal Fish Diversity in a Neotropical Hydropower Reservoir: Comparing eDNA Metabarcoding to Traditional Fishing Methods

Environmental DNA, Volume 8, Issue 2, March/April 2026.
Comparing eDNA metabarcoding and gillnet surveys in a Neotropical reservoir, this study finds that eDNA detects greater species richness yet reveals distinct assemblage structures. The results underscore the value of integrating both methods to achieve comprehensive biodiversity monitoring in hydropower‐impacted ecosystems.
Izabela Santos Mendes, Naiara Guimarães Sales, Allan D. McDevitt, Paulo Santos Pompeu, Francisco de Andrade Neto, Heron Oliveira Hilário, Daniel Cardoso Carvalho   +6 more
wiley   +1 more source

Reproductive biology of a population of Gymnotus aff.carapo (Teleostei: Gymnotidae) from southern Brazil

Neotropical Ichthyology
The reproductive period and its relation with somatic and abiotic factors, the relative and absolute fecundity, spawning type, length of first maturation and sex ratio is describe for Gymnotus aff.carapo from a small lake at Itapuã State Park, Rio Grande
Diego de Paula Cognato, Clarice Bernhardt Fialho   +1 more
doaj   +1 more source

Reproduction and Feeding of the Electric Fish Brachyhypopomus gauderio (Gymnotiformes: Hypopomidae) and the Discussion of a Life History Pattern for Gymnotiforms from High Latitudes

PLoS ONE, 2014
The reproductive biology and feeding habits of the electric fish Brachyhypopomus gauderio were studied. The species has seasonal reproductive behavior, with breeding occurring during the Southern Hemisphere spring and summer, and having a positive relation with the photoperiod variation.
Julia Giora, Hellen M Tarasconi, Clarice B Fialho   +2 more
openaire   +4 more sources