96 research outputs found
Wintering avifauna of Chaco and pantanal habitats in BahĂÂa Negra (Northern Paraguay)
Se estudiĂł la avifauna de hábitats tĂpicos de dos ecorregiones, el Pantanal y el Chaco, en el norte de Paraguay (departamento de Alto Paraguay) mediante transectas y observaciones puntuales. Se detectaron 132 especies (109 en bosque y 75 en rĂo), de las cuales 37 utilizaban además hábitats modificados. Las especies más abundantes fueron <i>Phalacrocorax olivaceus</i>, <i>Pitangus sulphuratus</i> y <i>Gnorimopsar chopi</i> en el rĂo y <i>Agelaioides badius</i>, <i>Coryphospingus cucullatus</i> y <i>Sicalis luteola</i> en el bosque. Doce especies en el rĂo y 11 en el bosque aparecieron en el 100% de los recorridos de las transectas, siendo 5 de ellas comunes a ambas zonas. Siete especies (6.4%) del bosque tuvieron un tamaño promedio de grupo de cinco o más individuos, mientras que en el rĂo fueron seis (8%). En el bosque eran numerosas las bandadas mixtas de <i>Zonotrichia capensis</i>, <i>Sicalis luteola</i>, <i>Coryphospingus cucullatus</i>, <i>Paroaria coronata</i>, <i>Agelaioides badius</i> y <i>Molothrus bonariensis</i>. La diversidad de especies observada fue de 80.4 en el bosque y de 58.1 en el rĂo.The avifauna of habitats typical of two ecoregions in northern Paraguay (Alto Paraguay Department), Chaco and Pantanal, was studied through transects and opportunistic observations. Of 132 species recorded, 109 were in the forest, 75 in the river, and 37 in disturbed habitats. The most common species were <i>Phalacrocorax olivaceus, Pitangus sulphuratus</i> and <i>Gnorimopsar chopi</i> in the river, and <i>Agelaioides badius, Coryphospingus cucullatus</i> and <i>Sicalis luteola</i> in the forest. Twelve species of river habitats and 11 species of forest habitats were recorded in all samplings, five of them common to both zones. Seven species (6.4%) of the forest and six (8%) of the river averaged a flock size of five or more individuals. In the forest, flocks were numerous and composed primarily of <i>Zonotrichia capensis, Sicalis luteola, Coryphospingus cucullatus, Paroaria coronata, Agelaioides badius</i> and <i>Molothrus bonariensis</i>. Species diversity was 80.4 in the forest and 58.1 in the river
Nymphal feeding of the genus Madenemura Paulian, 1949 (Plecoptera: Notonemuridae) from Madagascar
Life cycle of three stonefly species (Plecoptera) from an Apenninic stream (Italy) with the description of the nymph of Nemoura hesperiae
Nymphal growth, life cycle, and feeding habits of Potamanthus luteus (Linnaeus, 1767) (Insecta: Ephemeroptera) in the Bormida River, Northwestern Italy
Nymphal trophic behaviour of two Nemouridae species (Insecta, Plecoptera) in the Curone creek (northern Apennines, Italy)
Nymphal biology of Brachyptera risi (Morton, 1896) (Plecoptera: Taeniopterygidae) in a North Apennine stream (Italy)
Leaf litter decomposition (and invertebrate colonization) in alpine environments above the tree line: an experimental study
Feeding habits of Padogobius bonelli (Osteichthyes: Gobiidae) in the Curone Creek (Northwest Italy): territoriality influences diet?
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