Results 71 to 80 of about 1,946,041 (195)

Eye Darkening Under Dehydration Stress in the Neotropical Frog Boana punctata (Schneider, 1799)

Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, Volume 345, Issue 8, Page 887-893, October 2026.
Dehydration induces a strong and partially reversible increase in iris pigmentation in the Neotropical frog Boana punctata. The tight relationship between iris darkening and hydration state identifies ocular pigmentation as a simple, non‐invasive physiological biomarker with broad potential for assessing hydric stress in amphibian populations ...
Ricardo Reques, Eduardo F. Schaefer, Eduardo A. Sanabria, Leonardo D. Aguiar, Lorena B. Quiroga, Miguel Tejedo   +5 more
wiley   +1 more source

DRBCurrents Winter 1998

, 1998
DRBCurrents is a quarterly newsletter, published by Delaware River Basin Commission, an Interstate/Federal agency covering areas of Delaware, New Jersey, New York, Pennsylvania that manages the water resources within the 13,539-square mile-basin. In this

core   +1 more source

Fragmentation by Dams and Habitat Quality Affect Body Condition of a Small Characid in a Neotropical System

Ecology of Freshwater Fish, Volume 35, Issue 4, October 2026.
ABSTRACT The structure of stream networks naturally fragments freshwater habitats, but this complexity is increasingly intensified by dams and reservoirs. How anthropogenic fragmentation interacts with natural isolation gradients to affect fish populations remains poorly understood.
Ana Carolina Daldegan, Yan F. F. Soares, Paulo Vitor Rabelo, Vinicius Urbano, Bruno E. Soares, Juan P. Quimbayo, Laura B. Paula‐Souza, Carmino Emidio Junior, Amanda S. Vasconcelos, Débora L. Ferreira, Veronica Slobodian, Eduardo Bessa, Murilo S. Dias   +12 more
wiley   +1 more source

Contrasting Temporal Dynamics of Ostracod (Crustacea) Communities in Protected and Impacted Areas in a Brazilian Floodplain

Aquatic Conservation: Marine and Freshwater Ecosystems, Volume 36, Issue 9, September 2026.
ABSTRACT Environmental integrity is vital for the long‐term preservation of freshwater biodiversity, which is currently among the most threatened on Earth due to anthropogenic pressures such as dam construction. The present study investigated the temporal responses of ostracod communities over 8 years (2017–2024) in the Upper Paraná River floodplain ...
Jhony Kenji Nakata, Jonathan Rosa, Koen Martens, Janet Higuti   +3 more
wiley   +1 more source

Spatio‐Temporal Assessment of Fish Biodiversity in High‐Density Cascade Dam Rivers Using Environmental DNA Metabarcoding

Biological Diversity, Volume 3, Issue 3, Page 158-168, September 2026.
This study employed eDNA technology for biodiversity surveys and conducted high‐density spatiotemporal eDNA sampling to evaluate ecosystem‐scale patterns across temporal, spatial, and habitat dimensions. We identified 97 fish species from 12 orders, 29 families, and 71 genera using eDNA technology. Spatially, fish diversity indices were correlated with
Changping Jiang, Yanping Zhang, Changwei Jiang, Zijun Su, Tai Wang, Yanyan Du   +5 more
wiley   +1 more source

Influence of urban area on the water quality of the Campo River basin, Paraná State, Brazil

Brazilian Journal of Biology
The Campo River basin is located on the third plateau of the Paraná State or trap plateau of Paraná, at the middle portion between the rivers Ivaí and Piquiri, southern Brazil, between the coordinates 23° 53 and 24° 10’ South Latitude and 52° 15’ and 52°
K. Q. Carvalho, S. B. Lima, F. H. Passig, L. K. Gusmão, D. C. Souza, C. Kreutz, A. D. Belini, E. J. Arantes   +7 more
doaj   +1 more source

Niche Divergence in the South American Freshwater Crustacean Aegla Provides Insights Into Its Diversification

Ecology and Evolution, Volume 16, Issue 9, September 2026.
We investigated niche divergence among Aegla clades of freshwater crustaceans from southern South America. Results show distinct climatic preferences with low overlap, rejecting conservatism and linking ecology to diversification, highlighting niche divergence driving freshwater biodiversity.
Gislaine Puli, Álvaro Augusto Mainardi, Héllen Sbruzzi, Sandro Santos, Marlise Ladvocat Bartholomei‐Santos   +4 more
wiley   +1 more source

DETERMINATION OF THE REGULATOR RESERVE OF THE CAIUÁ AQUIFER IN THE PARANÁ STATE USING RECESSION CURVES OF THE ANTAS RIVER

Revista Águas Subterrâneas, 2009
The agriculture-industrial development in the northwest area of the state of Paraná, comes provoking in the last years the interest for the exploration of water in Caiuá aquifer.
André Celligoi, Uriel Duarte
doaj   +1 more source

Morphological Changes and Alterations in Erosion–Accretion Patterns in a Semiarid Brazilian River

Earth Surface Processes and Landforms, Volume 51, Issue 9, September 2026.
Flow regulation by the Castanhão Dam significantly altered discharge dynamics and reduced sediment transport in the Jaguaribe River. Long‐term analysis (1958–2025) reveals attenuated flood peaks, decreased channel migration and progressive downstream stabilisation, highlighting persistent geomorphic adjustments in a regulated semiarid fluvial system ...
Andrea Almeida Cavalcante, Davi Rodrigues Rabelo, Marcos de Brito Bezerra   +2 more
wiley   +1 more source

Molecular Markers Reveal a New and Possibly Threatened Species of Cnesterodon (Poeciliidae, Cnesterodontini) from the Upper Paraná River Basin, Brazil. [PDF]

Zebrafish, 2023
Morais-Silva JP, Scorsim B, Gonçalves G, Frota A, Graça WJD, Oliveira AV.   +5 more
europepmc   +1 more source