retorna
  :: Artigo selecionado
  Occurrence and diet of the Neotropical Otter in two rivers: an affected and a not affected by a natural disaster.
22/05/2015

MARCOS ANDRÉ NAVARRO
PR - CURITIBA
O estudo teve por objetivo investigar a ocorrência e a dieta da Lontra longicaudis em dois rios, um em bom estado de conservação (Rio das Pombas) e outro que foi atingido (Rio Santa Cruz) por um desastre natural por deslizamento de terra.

Área(s) de Atuação que o Presente Artigo trata
Biologia
Meio Ambiente e Biodiversidade
Inventário, Manejo e Conservação da Fauna


Navarro M.A.1, Quadros J. 1,2, Torres R. F. 3

 1 UFPR, PPG Zoologia; 2 UFPR, Setor Litoral; 3 ICMBio, Parque Nacional Saint-Hilaire/Lange. 

     The Neotropical Otter (Lontra longicaudis) is a semiaquatic mammal and depends on certain water bodies conditions to live well in their habitat. The present study aimed to investigate the occurrence and diet of L. longicaudis in two rivers, one well preserved (Rio das Pombas - RP) and another (Rio Santa Cruz - RSC) reached by a natural disaster of large proportions in March 2011, that mischaracterized its bed and its surroundings due to severe landslides. Before this event both rivers shared similar environmental features and were favorable to the presence of otters. Indeed, otters had been recorded in both. The studied rivers belong to the east side of Serra da Prata, an Atlantic Forest area included in the Saint-Hilaire/Lange National Park (Paraná, Brazil). Seven field campaigns were carried out between 2012 and 2013. We performed an active search for footprints, scratches, feces and dens along 3km of each river during each campaign. Evidences were recorded, photographed and georeferenced. Feces were collected for diet analysis. On RP, we recorded 16 dens in use, 10 tracks, 18 scratches and 77 feces. After feces screening, 186 food items were recorded: 62 in the category "fish", 58 in "crustaceans", 43 in "tetrapods" and 23 in "insects". The feeding rate (%) and the percentage of occurrence of each food group was 80.5 and 33.3 for fish, 75.3 and 31.2 for crustaceans, 55.8 and 23.1 for tetrapods and 29.9 and 12.4 for insects. On RSC dens were not registered and only one footprint and a single fecal sample were found during the same campaign. This fecal sample showed the presence of fish and crustaceans. Diet analysis is corroborated by the literature. Regarding the occurrence of L. longicaudis, the number of records on RP is greater than on RSC, even a year or more after the natural disaster, indicating how severe the impacts on the presence of otters can be. The destruction of the banks, the widening and deepening of the bed and the loss of riparian vegetation in the affected river seem to be unfavorable factors to the occurrence of L. longicaudis.

Key words: Landslide; southern Brazil; Saint-Hilaire/Lange National Park; Lontra longicaudis; Atlantic Forest


MARCOS ANDRÉ NAVARRO
PR - CURITIBA

Indique este Artigo enviando o Link:
http://www.crbiodigital.com.br/portal?txt=3577343230


Imagens / Fotos do Artigo 
  Poster apresentado no XII IUCN ...

 retorna

 

  :: Pesquisa Artigos
contenha a palavra 
Regional 
Nome do(a) Biólogo(a) 


pesquisar



Copyright 2007  -   contatocrbiodigital@crbiodigital.com.br  -   privacidade