Impacto de um desastre natural sobre o habitat e a ocorrência de Lontra longicaudis (Mustelidae, Carnivora) na Serra da Prata, Paraná, Brasil

Abstract

ABSTRACT. Impact of a natural disaster on the habitat and occurrence of Lontra longicaudis (Mustelidae, Carnivora) in Serra da Prata, Paraná, Brazil. Studies about natural disasters impact on fauna are rare in the scientific literature. Concerning Lontra longicaudis (Olfers, 1818), published data could not be found. This study aimed to determine whether the landslides occurred in March 2011 in part of the slopes of Serra da Prata (Paraná, Brazil) affected the occurrence of the Neotropical Otter in the impacted area. With this purpose, the study area comprehended an affected river (Rio Santa Cruz -RSC), on the east face of those mountains that was compared to another one, on the same face and with similar original features, but not affected by the natural disaster (Rio das Pombas -RP). The study area is located within the boundaries of a conservation unit (Parque Nacional de Saint-Hilaire/Lange, PNSHL). Seven field campaigns from the altitudinal limit of PNSHL (60 m a.s.l.) towards upstream, were conducted between August 2012 and July 2013. Campaigns consisted of an active search for evidence (scats, footprints, scratches) and otter dens along 3 km of river banks. Other mammal records were also registered. Each evidence was noted down on a field book, photographed and georeferenced. Dens were monitored along field campaigns. Concerning otters, 102 vestiges (11 scratches, 11 footprints and 80 scats) and 17 dens were recorded in the not affected river (RP); and the affected river (RSC) presented only four vestiges (three footprints, one scat) and one den. Other mammal records denoted the presence of eight taxa at RP and 14 at RSC. The conspicuous differences in the amount of evidences of otter presence indicate that the natural disaster affected the otter population in RSC river and that even more than two years later otters had only discreetly come back. On the other hand, other mammal species, such as Cuniculus paca (Linnaeus, 1758) reoccupied the river banks abundantly.KEYWORDS. Atlantic Forest, landslides, Lutrinae, mammals, Saint-Hilaire/Lange National Park.RESUMO. Estudos com impacto de desastres naturais sobre a fauna são raros na literatura científica. Considerando Lontra longicaudis (Olfers, 1818), informações publicadas não foram encontradas. O presente estudo buscou determinar se os deslizamentos de terra ocorridos em março de 2011 em parte das montanhas da Serra da Prata (Paraná, Brasil) afetaram de alguma forma a ocorrência da Lontra Neotropical no local impactado. Com esse propósito, a área estudada compreendeu um rio afetado (Rio Santa Cruz -RSC) da face leste dessa serra que foi comparado com outro não afetado (Rio das Pombas -RP), localizado na mesma face da serra e com características semelhantes às originais do RSC. A área de estudo está situada no Parque Nacional de Saint-Hilaire/Lange (PNSHL). Foram realizadas sete campanhas a partir do limite altitudinal do PNSHL (60 m s.n.m) para montante entre agosto de 2012 e julho de 2013. As campanhas consistiram de busca ativa por vestígios (fezes, pegad...