Results 51 to 60 of about 3,790 (211)

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

Journal of Experimental Zoology Part A: Ecological and Integrative Physiology, EarlyView.
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

Reynolds shear-stress and velocity: positive biological response of neotropical fishes to hydraulic parameters in a vertical slot fishway

Neotropical Ichthyology
The barriers created by dams can cause negative impacts to aquatic communities, and migratory fish species are directly affected. Fishways have been developed to allow the upstream passage of fishes through dams.
Bernardo Alan de Freitas Duarte, Isabella Cristina Resende Ramos, Hersília de Andrade e Santos   +2 more
doaj   +1 more source

Comparative Cytogenetics Analysis Among Peckoltia Species (Siluriformes, Loricariidae): Insights on Karyotype Evolution and Biogeography in the Amazon Region

Frontiers in Genetics, 2021
Peckoltia is widely distributed genus in the Amazon and Orinoco basins and the Guiana Shield, containing 18 valid species, and distinct morphotypes still needing description in the scientific literature due to its great taxonomic complexity.
Kevin Santos da Silva, Augusto Cesar Paes de Souza, Ananda Marques Pety, Renata Coelho Rodrigues Noronha, Marcelo Ricardo Vicari, Julio Cesar Pieczarka, Cleusa Yoshiko Nagamachi   +6 more
doaj   +1 more source

Effects of cadmium on the female reproductive axis of a Neotropical fish

Chemosphere, 2022
Metals are one of the contaminants released from the increase of anthropic activities. They can be classified as endocrine disruptors once they can affect the reproductive parameters of different organisms. The aim of the study was to evaluate the potential effects of cadmium on regulatory reproduction axis (Hypothalamic-Pituitary-Gonadal-Liver, the ...
Maiara Vicentini, Letícia da Silva Pereira Fernandes, Antonio Ernesto Meister Luz Marques, Flávio Henrique Tincani Osório, Loana Mara Baika, Wagner Ezequiel Risso, Cláudia Bueno dos Reis Martinez, Marco Tadeu Grassi, Luiz Fernando Fávaro, Maritana Mela, Marta Margarete Cestari, Helena Cristina Silva de Assis   +11 more
openaire   +2 more sources

The disruption of seed dispersal networks: disentangling the effects of habitat loss and fragmentation

Oikos, EarlyView.
Seed dispersal by frugivores is a central process linking plant reproduction, animal foraging, population persistence, and ecosystem resilience. Currently, the spatial template sustaining these interactions is rapidly reconfigured by habitat loss and fragmentation promoted by human activity.
Eliana Cazetta, Paulo R. Guimarães Jr
wiley   +1 more source

Genomic resources for the monitoring and management of Tometes trilobatus, Hoplias aimara and Myloplus rhomboidalis, three exploited freshwater fish species in French Guiana

Knowledge and Management of Aquatic Ecosystems
The Neotropical region, hosts a quarter of all freshwater fish species, while providing important food resources for local human populations. The management of neotropical freshwater ecosystems is thus of primary importance for both biodiversity ...
Condachou Céline, Cuenot Yves, Pigeyre Laetitia, Covain Raphael, Vigouroux Régis, Brosse Sébastien, Murienne Jérôme   +6 more
doaj   +1 more source

Speciation with gene flow

PLANTS, PEOPLE, PLANET, EarlyView.
Biodiversity is threatened by human activities, with extinction debt accumulating rapidly. Many of these activities change the connectivity of populations, fragmenting existing population systems or bringing previously isolated populations or species into contact.
Zhiqin Long, Xu Zhang, Yue Yu, Gregory L. Owens, Diana J. Rennison, Clarisse Palma‐Silva, Daniel Ortiz‐Barrientos, Loren H. Rieseberg   +7 more
wiley   +1 more source

The most threatened plants receive the least scientific attention

PLANTS, PEOPLE, PLANET, EarlyView.
Plants sustain all life, providing the energetic and structural basis of ecosystems, but they face a growing risk of extinction. Reversing this decline requires an understanding of how scientific knowledge is distributed among species, and identification of the biases and gaps that hinder effective responses to the threats they face. However, we reveal
Renon S. Andrade, Matilda J. M. Brown, Leandro Freitas, Eimear M. Nic Lughadha   +3 more
wiley   +1 more source

Improved Cerrado Wetland Mapping Through Seasonal Moisture Metrics, Terrain Information and Semantic Segmentation

Remote Sensing in Ecology and Conservation, EarlyView.
Brazil's Cerrado valley wetlands—swamp savanna and gallery forest—are highly important for the biome's water cycle and carbon storage and are susceptible to degradation from the impacts of land use expansion and the climate crisis. In support of their detailed monitoring and assessment, we developed and tested a transferable mapping approach that ...
Felix Beer, Hugo do Nascimento Bendini, Mateus de Souza Miranda, Vu‐Dong Pham, Leila Maria Garcia Fonseca, Cássia Beatriz Rodrigues Munhoz, Sebastian van der Linden   +6 more
wiley   +1 more source

Drivers of parasite sharing among Neotropical freshwater fishes [PDF]

Journal of Animal Ecology, 2014
SummaryBecause host–parasite interactions are so ubiquitous, it is of primary interest for ecologists to understand the factors that generate, maintain and constrain these associations. Phylogenetic comparative studies have found abundant evidence for host‐switching to relatively unrelated hosts, sometimes related to diversification events, in a ...
Mariana P. Braga, Emanuel Razzolini, Walter A. Boeger   +2 more
openaire   +2 more sources