Use of forest corridors by boreal Xestia moths

Abstract

We studied movements of the noctuid moths Xestia speciosa and X. fennica in a fragmented forest landscape including old-growth spruce forest corridors in eastern Finland. We individually marked and released 1,796 adults of the habitat generalist X. speciosa and 683 individuals of X. fennica, which prefers old-growth spruce forests. Moths were recaptured with 60 sugar-bait traps that were placed within habitat corridors, in the non-habitat matrix and in surrounding old-growth forest patches. Both species favoured the corridors during their movements and tended to avoid entering the matrix. We analysed recapture rates and movements of the recaptured moths. Results suggest that X. speciosa moves longer distances than X. fennica. Though corridors clearly canalized movements by both species, the impact of old-growth forest corridors at the larger landscape scale was less clear in X. fennica. Movement behaviour of the two sexes differed more than that of the two species.

Bayesian Methods for Analyzing Movements in Heterogeneous Landscapes From Mark–recapture Data

“…However, this requirement is rarely met, especially in studies of insect dispersal, where the number of suitable habitat patches can be very large Manuscript received 14 March 2007;revised 16 May 2007;accepted 18 June 2007. Corresponding Editor: S. T. Buckland. 3 E-mail: otso.ovaskainen@helsinki.fi (e.g., Hanski 1999), or variation in landscape structure may be of more or less continuous nature (e.g., Varkonyi et al 2003). While data not suitable for multisite models have been analyzed using a variety of approaches, methods that would allow the estimation of movement parameters in an effective and unbiased manner appear to be still lacking.…”

Using Forest Compensation Funds to Reverse Biodiversity Loss: A Case Study of Turin–Lyon High-Speed Railway Line

“…To reverse this trend, it is crucial to connect subpopulations and locally reduce reforestation, which is one of the major threats for the species in the Alpine environment [27]. Artificial and natural corridors-especially those surrounded by forest-are generally used by insects-in particular butterflies and moths-to disperse and colonize new areas [70][71][72]. Indeed, there is a good chance that butterfly species will use the interconnected, newly created small-clearings as a corridor to disperse.…”

Importância dos corredores ripários para a fauna - pequenos mamíferos em manchas de floresta, matriz do entorno e elementos lineares em uma paisagem fragmentada de Mata Atlântica

“…Atualmente, a funcionalidade dos corredores para a movimentação de indivíduos (Bolger et al 2001;Machtans et al 2002;Vákonyi et al 2003 Florestal Brasileiro prevê a manutenção, conservação e restauração das matas ripárias, que são consideradas Áreas de Preservação Permanente, em uma extensão que varia de 30 a 500 m de largura dependendo da largura do rio. Apesar de explicito nessa legislação que as matas ripárias são importantes não apenas para a proteção e manutenção da qualidade da água, como também para o deslocamento e manutenção da fauna e flora local, a função das matas ripárias para a conectividade de paisagens fragmentadas de Mata Atlântica ainda não foi testada para nenhum grupo faunístico.…”