Results 21 to 30 of about 3,534 (159)

Dynamics of occupation in the Ituqui River/Paranã of Maicá region, Santarém/PA : 8000 years to the present

, 2023
Con base en un estudio en curso en la región de Rio Ituqui y Paranã do Maicá, municipio de Santarém/PA, queremos reflexionar sobre las distintas evidencias de ocupaciones encontradas, referidas a 8000 años de ocupación. Además, vemos las ocupaciones quilombolas actuales como piezas clave para repensar algunos conceptos preestablecidos: comunidad versus
Py-Daniel, Anne Rapp, O´Dywer, Eliane Cantarino, Moraes, Claide de Paula, Moreira, Cínthia dos Santos, Pinto, Rafaela dos Santos, Pinto, Elaine dos Santos   +5 more
openaire   +1 more source

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

Biological Diversity, EarlyView.
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

Longitudinal gradient in limnological variables in the Upper Paraná River: a brief description and the importance of undammed tributaries

Acta Limnologica Brasiliensia, 2017
Aim: Describe the limnological pattern in a longitudinal gradient in the Paraná River, a highly dammed river, in a stretch localized between two dams, but rich in undammed tributaries.
Natália Fernanda Santana, Larissa Strictar Pereira, Maria do Carmo Roberto, Sue Ellen do Amaral Gomes, Thomaz Aurélio Pagioro, Roger Paulo Mormul   +5 more
doaj   +1 more source

Conservation status and bio-ecology of Brycon orbignyanus (Characiformes: Bryconidae), an endemic fish species from the Paraná River basin (Brazil) threatened with extinction [PDF]

Neotropical Ichthyology, 2019
Brycon orbignyanus is an endemic species from La Plata basin whose stocks have been presenting significant reductions throughout the Paraná River. Brycon orbignyanus is categorized as an endangered species. This study evaluated aspects of the bio-ecology
Lívia Helena Tonella, Rosa Maria Dias, Oscar Barroso Vitorino Junior, Rosemara Fugi, Angelo Antonio Agostinho   +4 more
doaj   +1 more source

Continental scale metagenomics reveals Microcystis‐induced synchrony among aquatic taxa is exacerbated by trophic cascades

Ecography, EarlyView.
Harmful Microcystis proliferation severely threatens aquatic ecosystems globally, but its impacts on food‐web stability remain poorly understood. Here, we analyzed 1309 metagenomic samples from freshwater ecosystems across China to investigate how Microcystis abundance affects synchrony among taxa in multi‐trophic food webs (from bacteriophages to ...
Lemian Liu, Siqi Zhu, Xiaoqin Huang, Wenjia Hu, Lixiang Luo, Xiusong Pan, Jianfeng Chen   +6 more
wiley   +1 more source

Fish, Barra Bonita River, upper Paraná River basin, state of Paraná, Brazil. [PDF]

Check List, 2008
The Barra Bonita River is an affluent of the left margin of the Ivaí River, upper Paraná River basin. Fishsamples were conduced in November 2006 (spring) and in February 2007 (summer), in three sampling stations alongthe Barra Bonita River, using gill ...
Bifi, A. G., Graça, W. J., Zawadzki, C. H., Maier, A.   +3 more
doaj   +4 more sources

Rickettsia parkeri in Argentina

Emerging Infectious Diseases, 2008
Clinical reports of an eschar-associated rickettsiosis in the Paraná River Delta of Argentina prompted an evaluation of Amblyomma triste ticks in this region. When evaluated by PCR, 17 (7.6%) of 223 questing adult A.
Santiago Nava, Yasmin Elshenawy, Marina E. Eremeeva, John W. Sumner, Mariano Mastropaolo, Christopher D. Paddock   +5 more
doaj   +1 more source

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