Results 41 to 50 of about 246 (153)

Parameter estimates for fishes of the upper Paraná river floodplain and Itaipu reservoir (Brazil) [PDF]

Naga, 2005
Estimates of the growth (K), natural mortality (M), consumption/biomass (Q/B) rate and trophic level (TL) for 35 species in the upper Paraná river floodplain and the Itaipu reservoir (interconnected ecosystems) are presented. A compilation of these biological statistics is made for comparison purposes and some general trends are briefly discussed.
Angelini, R., Agostinho, A.A.
openaire   +2 more sources

Characterization of wild fish diet and trophic guild in a protected area

Acta Limnologica Brasiliensia, 2022
: Aim We characterize the diet and trophic guild to the fish community in a protected area to contribute information about the trophic ecology. Methods The collection was carried out at three sampling points, in 2017 and 2018, with the help of gill ...
Julia Kaori Kuriyama Ramos, Natália Luiza da Silva, Vinicius Cesar do Bonfim, Bianca Yunes Fornari, Bruna Caroline Kotz Kliemann, Cibele Diogo Pagliarini, Heleno Brandão, Igor Paiva Ramos   +7 more
doaj   +1 more source

Assessing Soil and Management Quality Indexes in A Rural Watershed Under Long‐Term No‐Tillage in Southern Brazil

Land Degradation &Development, Volume 37, Issue 14, Page 10217-10231, 30 August 2026.
ABSTRACT Soil quality assessment is essential to detect management failures and prevent land degradation in agricultural systems. No‐tillage system (NTS) is a conservation management widely adopted in Brazil, but its effectiveness is compromised when adherence to the core principles of crop rotation and ground cover is not complete, and basic ...
Edson Lucas Camilo, Miguel David Fuentes‐Guevara, Renata Alessandra Martins Borecki, Leandro Rampim, Cristiano Andre Pott, Marcelo Marques Lopes Muller   +5 more
wiley   +1 more source

Length-weight relationship of fishes caught in the Itaipu Reservoir, Parana, Brazil [PDF]

Naga, 1997
Parameters and related statistics of the length-weight relationship of the form W=aL super(b) are presented for 72 species of fish caught in the area of the Itaipu Reservoir in Parana, Brazil. The b values varied between 2.34 and 3.35, with the mean b=2.986 (s.d.=0.230) not significantly different from 3.0 (df=7, p=0.05).
Benedito-Cecilio, E., Agostinho, A.A., Carnelos-Machado Velho, R.C.   +2 more
openaire   +2 more sources

Global Performance of Remote Sensing‐Based and Reanalysis‐Driven Models to Estimate Open Water Evaporation

Water Resources Research, Volume 62, Issue 7, July 2026.
Abstract Evaporation plays an essential role in the water cycle, influencing local and regional climates while directly impacting water availability in lakes. However, directly measuring evaporation over water bodies remains challenging due to the high costs of installing and maintaining the required in situ instrumentation.
Júlia Brusso Rossi, Ayan Santos Fleischmann, Leonardo Laipelt, Bruno Comini de Andrade, Joshua B. Fisher, Justin L. Huntington, Christopher Pearson, R. Iestyn Woolway, Roseilson Vale, Raoni A. S. Santana, Júlio Tota, Gabriel B. Senay, Huilin Gao, Anderson Ruhoff   +13 more
wiley   +1 more source

Occurrence of multiple congenital anomalies in Potamotrygon amandae (Elasmobranchii, Potamotrygoninae) embryos, including the first report of bicephaly

Journal of Fish Biology, Volume 109, Issue 1, Page 257-263, July 2026.
Abstract Reports of teratogenic embryos in elasmobranchs have been documented in multiple species, with proposed aetiologies including environmental disturbances, genetic mutations, predation, exposure to endocrine‐disrupting compounds and maternal stress.
Douglas de Castro Ribeiro, Raquel Lopes Queiroz, Cristiéle da Silva Ribeiro   +2 more
wiley   +1 more source

The making of pure quartzose sand in continental interiors: Paraná River (Brazil and Argentina)

Sedimentology, Volume 73, Issue 3, Page 802-837, April 2026.
ABSTRACT As part of a comprehensive project on sedimentary processes in South America, this study focuses on sediment generation in the intracratonic Paraná Basin and monitors the evolution of sand composition along the Paraná River from central Brazil to the Río de la Plata estuary in Argentina.
Eduardo Garzanti, Marta Barbarano, Mara Limonta, Guido Pastore, Pieter Vermeesch, Giovanni Vezzoli   +5 more
wiley   +1 more source

Niche differentiation between a native and an invasive species of submersed macrophyte in a subtropical reservoir

Acta Botânica Brasílica, 2021
Submersed macrophytes have important ecological roles but non-native invasive species may affect biodiversity and water uses. We investigated the native macrophyte Egeria najas and the invasive Hydrilla verticillata and measured their maximum ...
Fernanda Moreira Florêncio, Márcio José Silveira, Sidinei Magela Thomaz   +2 more
doaj   +1 more source

Unprotected Waters: When Protection Fails In Freshwater

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 3, March 2026.
ABSTRACT Invasive species are a major driver of biodiversity loss in protected areas (PAs), yet their impacts in aquatic environments are less well documented. This study investigated the occurrence and distribution of nonnative freshwater fish in federal PAs in Brazil.
Aymar Orlandi Neto, Éder André Gubiani, Igor Paiva Ramos   +2 more
wiley   +1 more source

Parasitism by Monogenoidea in Piaractus mesopotamicus (Characiformes, Characidae) cultivated in Paraná River (Brazil)

Brazilian Journal of Biology, 2017
This study investigated the occurrence, prevalence, mean abundance and mean intensity of monogenoidean parasites in Piaractus mesopotamicus farmed in cages in the reservoir of the Itaipu Hydroelectric Power Station, Paraná River, Brazil.
M. S. L. Leão, M. C. N. Justo, G. W. Bueno, S. C. Cohen, S. C. São Clemente   +4 more
doaj   +1 more source