quarta-feira, 14 de setembro de 2011
Road Ecology Brazil 2011
O Road Ecology Brazil 2011 é um evento científico que ocorrerá em Lavras, MG, entre os dias 17 e 19 de outubro deste ano focado temas de ecologia e sua relação com estradas e rodovias. A Comissão Organizadora lembra que as inscrições com valores reduzidos se encerram no dia 16 de setembro, e que as inscrições pela internet encerram dia 30 de setembro. Então se estiver interessado entre em contato pelo e-mail oficial do evento - roadecology2011@gmail.com - ou visite o site oficial: http://www.dbi.ufla.br/reb2011/index.php.
Fotos: Dasyprocta azarae
Fotógrafo: Nathalia dos Santos Freitas.
Contato: nfreitas.nathalia@gmail.com
sábado, 10 de setembro de 2011
Otter (Lutra lutra) predation on stocked brown trout (Salmo trutta) in two Danish lowland rivers
JACOBSEN, L. 2005. Otter (Lutra lutra) predation on stocked brown trout (Salmo trutta) in two Danish lowland rivers. Ecology of Freshwater Fish 14:59-68.
Abstract. This study aimed to evaluate otter predation on stocked trout. Large hatchery-reared trout (16–30 cm) were stocked into two Danish rivers with different fish populations. Otter diet before and after trout stocking was determined by analysing 685 spraints, collected regularly during the 35-day study period. Fish composition in the rivers before stocking was assessed by electrofishing. In River Trend, a typical trout river, the proportion of trout in the otter diet increased from 8% before stocking to 33% a few days after stocking. Moreover, trout lengths in the diet changed significantly towards the lengths of stocked trout, indicating that newly stocked trout were preferred to wild trout. In River Skals, dominated by cyprinids, there was no change in otter diet after stocking of hatchery trout, i.e., these were ignored by otter. Otter predation should be taken into account together with fish and bird predation, when stocking is used as a measure for conserving endangered salmonid populations.
Abstract. This study aimed to evaluate otter predation on stocked trout. Large hatchery-reared trout (16–30 cm) were stocked into two Danish rivers with different fish populations. Otter diet before and after trout stocking was determined by analysing 685 spraints, collected regularly during the 35-day study period. Fish composition in the rivers before stocking was assessed by electrofishing. In River Trend, a typical trout river, the proportion of trout in the otter diet increased from 8% before stocking to 33% a few days after stocking. Moreover, trout lengths in the diet changed significantly towards the lengths of stocked trout, indicating that newly stocked trout were preferred to wild trout. In River Skals, dominated by cyprinids, there was no change in otter diet after stocking of hatchery trout, i.e., these were ignored by otter. Otter predation should be taken into account together with fish and bird predation, when stocking is used as a measure for conserving endangered salmonid populations.
quarta-feira, 7 de setembro de 2011
Fotos: Myocastor coypus
Espécie: Myocastor coypus (ratão-do-banhado).
Fotógrafo: Nathália dos Santos Freitas.
Contato: sfreitas.nathalia@gmail.com
terça-feira, 6 de setembro de 2011
Unisinos - Seleção de Docente
A Universidade do Vale do Rio dos Sinos (UNISINOS), localizada em São Leopoldo, Rio Grande do Sul, abriu processo de seleção para docentes. Os interessados devem ter título de Doutor. Maiores informações no edital de seleção.
sábado, 3 de setembro de 2011
Impact of hunting on large vertebrates in the Mbaracayu Reserve, Paraguay
HILL, K.; PADWE, J.; BEJYVAGI, C.; BEPURAGI, A.; JUKAGI, F.; TYKUARANGI, R.; TYKUARANGI, T. 1997. "Impact of hunting on large vertebrates in the Mbaracayu Reserve, Paraguay. Conservation Biology 11(6):1339-1353.
Abstract. Over 1,400,000 m of line transect data were collected in collaboration with Ache Indians to determine encounter rates with all large vertebrates in the Mbaracayu Reserve Paraguay. The data were analyzed using logistic regression in order to determine the impact of human hunting on animal encounter rates in the reserve. The method controlled for effects of season, weather, time of day, and habitat in order to statistically isolate the human predation effect. Encounters with the animals themselves as well as fresh signs of their activity allowed us to determine whether lower encounter rates in hunted zones are simply due to increased wariness by target species. Our results show that areas near hunters are hunted more frequently, and that Dasypus novemcinctus, Cebus apella, Tapirus terrestris, and Mazama spp. are all encountered at lower rates in those areas than in unhunted zones. We were unable to show that encounter rates with other important game species have been affected by human hunting. Demonstration of local depletion by central place foragers is expected, However, and cannot be used to conclude that prey species are in danger of regional extirpation.
Abstract. Over 1,400,000 m of line transect data were collected in collaboration with Ache Indians to determine encounter rates with all large vertebrates in the Mbaracayu Reserve Paraguay. The data were analyzed using logistic regression in order to determine the impact of human hunting on animal encounter rates in the reserve. The method controlled for effects of season, weather, time of day, and habitat in order to statistically isolate the human predation effect. Encounters with the animals themselves as well as fresh signs of their activity allowed us to determine whether lower encounter rates in hunted zones are simply due to increased wariness by target species. Our results show that areas near hunters are hunted more frequently, and that Dasypus novemcinctus, Cebus apella, Tapirus terrestris, and Mazama spp. are all encountered at lower rates in those areas than in unhunted zones. We were unable to show that encounter rates with other important game species have been affected by human hunting. Demonstration of local depletion by central place foragers is expected, However, and cannot be used to conclude that prey species are in danger of regional extirpation.
Assinar:
Postagens (Atom)