Results 71 to 80 of about 950,037 (232)

Sensibility of Neotropical Fishes to Dichromate of Potassium

Ecotoxicology and Environmental Contamination, 2008
The objective of this study was to evaluate the sensitivity of potassium dichromate to Piaractus mesopotamicus (pacu), Hyphessobrycon eques (mato-grosso) e Phallocerus caudimaculatus (guaru). The LC(I)50;96h for the P. mesopotamicus was 144.50 ± 19.67 mg L-1; for the H. Eques, 130.79 ± 10.02 mg L-1; and for the P.
Claudinei da Cruz, P. Cubo, G. R. Gomes, F. P. Venturini, P. E. Guilherme, R. A. Pitelli   +5 more
openaire   +1 more source

A new species of Gymnotus (Gymnotiformes: Gymnotidae) from the Fitzcarrald Arch of southeastern Peru

Neotropical Ichthyology
Herein Gymnotus chaviro is described from the Alto Yuruá (upper rio Juruá) of southeastern Peru, where it is locally abundant in terra firme streams and floodplain oxbow lakes, and occurs sympatrically and syntopically with the type species of the genus ...
Emmanuel L. Maxime, James S. Albert
doaj   +1 more source

Unusual importance of insectivory in the diet of the Neotropical otter, Lontra annectens (Major, 1897) (Mammalia, Carnivora) [PDF]

Neotropical Biology and Conservation
The Neotropical otter, Lontra annectens, is a predator specialized in aquatic prey, and the main diet of this otter is fish, supplemented mainly by crustaceans and opportunistically by mollusks, insects, and vertebrates such as mammals, amphibians, birds,
Luis Ángel Pozos-López, Noé González-Ruiz, José Ramírez-Pulido   +2 more
doaj   +3 more sources

Availability of a Keystone Plant Resource Reduces Niche Overlap and Drives Distinct Species‐Specific Changes in Niche Breadth Among Small Rodents

Integrative Zoology, EarlyView.
We investigated how three rodent species respond to the seasonal availability of Araucaria angustifolia seeds. While Oligoryzomys spp. increased seed consumption and abundance during seed production, the more insectivorous Akodon paranaensis maintained a broader diet.
Adriana A. Perini, Emerson M. Vieira
wiley   +1 more source

Upstream and downstream migration speed of Prochilodus costatus (Characiformes: Prochilodontidae) in upper São Francisco basin, Brazil

Neotropical Ichthyology
Details of migration dynamics of Neotropical fishes are poorly understood. This study aimed to examine upstream (spawning) and downstream (post-spawning) migration speeds, of curimatá-pioa (Prochilodus costatus) in the São Francisco River basin ...
João de Magalhães Lopes, Carlos Bernardo Mascarenhas Alves, Alexandre Peressin, Paulo Santos Pompeu   +3 more
doaj   +1 more source

Hidden Losses: Assessing the Risk of Coextinction Among Ectoparasitic Flies and Their Bat Host Species in Brazil

Animal Conservation, EarlyView.
The potential impact of bat species extinction on the number of their ectoparasitic fly species, based on interaction data for Brazil. As bat host species are removed over time, more connected species (green) would experience steeper declines and lead to greater ectoparasite losses when compared to a random extinction model (gray).
Nathan Lorenzo de Sena Gotti, Jonathan Ramos Ribeiro, Eder Barbier, Enrico Bernard   +3 more
wiley   +1 more source

Selectivity of fish ladders: a bottleneck in Neotropical fish movement

Neotropical Ichthyology
Although dozens of fish ladders have been constructed at dams of Brazilian reservoirs, there are few studies evaluating their efficiency as a tool for the conservation of Neotropical ichthyofauna, especially for migratory species.
Carlos Sérgio Agostinho, Angelo Antônio Agostinho, Fernando Pelicice, Deusimar Augusto de Almeida, Elineide Eugênio Marques   +4 more
doaj   +1 more source

AI‐Assisted Morphometric Analysis and Molecular Phylogeny for a Dactylogyrid (Monopisthocotyla) Skin Parasite of an Ornamental Crenuchid Fish From Brazil

Acta Zoologica, EarlyView.
ABSTRACT This study presents a formal description and taxonomic appraisal of Cacatuocotyle adrianoi sp. n., a Neotropical parasite belonging to the family Dactylogyridae, integrating AI‐assisted morphometric analyses, molecular data, and phylogenetic reconstruction. Phylogenetic analyses recovered Cacatuocotyle adrianoi sp. n.
J. C. C. Aguiar, M. M. Osaki‐Pereira, N. G. Silva, P. D. Mathews, R. J. Silva   +4 more
wiley   +1 more source

Water temperature, body mass and fasting heat production of pacu (Piaractus mesopotamicus)

Anais da Academia Brasileira de Ciências
Knowledge on fasting heat production (HEf) of fish is key to develop bioenergetics models thus improving feeding management of farmed species. The core of knowledge on HEf of farmed, neotropical fish is scarce. This study assessed the effect of body mass
FREDY A.A. AGUILAR, THALINE M.P. DA CRUZ, GERSON B. MOURÃO, JOSÉ EURICO P. CYRINO   +3 more
doaj   +1 more source

The complete mitochondrial genome sequences of five Otophysi species (Vertebrata, Teleostei)

Mitochondrial DNA. Part B. Resources, 2019
Complete mitochondrial genomes of the characiform fishes Astyanax fasciatus, Astyanax altiparanae, Hoplias malabaricus (Karyomorph A) and the Gymnotiformes species Gymnotus sylvius and Gymnotus cuia were characterized in the present study.
Rodrigo Milan Calegari, Pedro Henrique Mira Rodrigues, Rodrigo Zeni dos Santos, Fausto Foresti, Ricardo Utsunomia, Fábio Porto-Foresti   +5 more
doaj   +1 more source