Results 161 to 170 of about 7,231 (200)

Efficiency of fish ladders for neotropical ichthyofauna

River Research and Applications, 2002
AbstractThe reproductive strategies of potamodromous fish of the Plata basin involve upstream migration and passive downstream movements of eggs and larvae for dozens of kilometres. At the end of the downstream movements, the fry need marginal lagoons or bays in order for their development to be successful.
Angelo Antonio Agostinho, Luiz CARLOS Gomes   +1 more
exaly   +2 more sources

Oxygen consumption in weakly electric Neotropical fishes

Oecologia, 2003
Weakly electric gymnotiform fishes with wave-type electric organ discharge (EOD) are less hypoxia-tolerant and are less likely to be found in hypoxic habitats than weakly electric gymnotiforms with pulse-type EOD, suggesting that differences in metabolism resulting from EOD type affects habitat choice.
David, Julian, William G R, Crampton, Stephanie E, Wohlgemuth, James S, Albert   +3 more
openaire   +2 more sources

Comparison of fish and macroinvertebrates as bioindicators of Neotropical streams

Environmental Monitoring and Assessment, 2015
The biomonitoring of aquatic ecosystems in developing countries faces several limitations, especially related to gathering resources. The present study aimed at comparing the responses of fish and benthic macroinvertebrates to environmental change, to identify which group best indicates the differences between reference and impacted streams in southern
Renata, Ruaro, Éder André, Gubiani, Almir Manoel, Cunico, Yara, Moretto, Pitágoras Augusto, Piana   +4 more
openaire   +2 more sources

Fruit preferences by fishes in a Neotropical floodplain

Biotropica, 2020
AbstractThe diets of frugivorous animals result from the interaction between feeding preference and ecological factors such as availability of alternative resources and interactions with other frugivores. A better understanding of frugivore diets will enable predictions about the vulnerability of plant populations to anthropogenic or natural ...
Joisiane Mendes Araujo, Sandra Bibiana Correa, Jill Anderson, Jerry Penha   +3 more
openaire   +1 more source

Detritivory in neotropical fish communities

Environmental Biology of Fishes, 1983
Fish communities of major river systems in South America contain a high proportion of detritivorous fishes in the families Prochilodontidae and Curimatidae. These families include important fish stocks that in some regions comprise over 50 percent of the community ichthyomass.
openaire   +1 more source

Adverse effects of herbicides in freshwater Neotropical fish: A review

Aquatic Toxicology, 2022
Although herbicides have been developed to act on the physiological processes of plants, they are responsible for causing deleterious effects on animals. These chemical compounds are widely used throughout the world, but especially in countries that export agricultural products such as Central and South America, their use has increased in recent years.
Yves Moreira Ribeiro, Davidson Peruci Moreira, André Alberto Weber, Camila Ferreira Sales, Rafael Magno Costa Melo, Nilo Bazzoli, Elizete Rizzo, Alessandro Loureiro Paschoalini   +7 more
openaire   +2 more sources

Fish farming as the main driver of fish introductions in Neotropical reservoirs

Hydrobiologia, 2014
Several human activities may result in or facilitate species introductions. In aquatic environments, species introductions are often associated with the construction of dams. In this study, we use reservoirs of the Neotropical region as a model to determine the main causes of fish species introductions.
Jean C. G. Ortega, Horácio F. Júlio, Luiz C. Gomes, Angelo A. Agostinho   +3 more
openaire   +1 more source

Ascent of neotropical migratory fish in the Itaipu Reservoir fish pass

River Research and Applications, 2011
AbstractThe Piracema Canal is a complex 10‐km fish pass system that climbs 120 m to connect the Paraná River to the Itaipu Reservoir along the Brazil–Paraguay border. The canal was constructed to allow migratory fishes to reach suitable habitats for reproduction and feeding in tributaries upstream from the reservoir.
Makrakis, S, Miranda, L E, Gomes, L C, Makrakis, M C, Junior, H MF   +4 more
openaire   +1 more source

Vasotocinergic control of agonistic behavior told by Neotropical fishes

General and Comparative Endocrinology, 2019
The hypothalamic neuropeptides of the vasopressin-oxytocin family (and their homologs for non-mammalian species) are key modulators of the Social Brain Network, acting via specific receptors reported in all the nuclei of this network. Different conclusive examples have proven the context-dependency actions of hypothalamic nonapeptides on social ...
Silva, Ana C., Pandolfi, Matias
openaire   +3 more sources

Regulation and stability in fish assemblages of neotropical floodplain lakes

Oecologia, 1994
Neotropical floodplain lakes provide an excellent opportunity to examine the regulation and stability of fish assemblages. At low water, when lakes are separated, fish are concentrated in the lakes and are presumably subject to strong interspecific interactions that can shape assemblage structure. At high water, when the lakes and river channels become
Macro A, Rodríguez, William M, Lewis
openaire   +2 more sources