4.3 Article

Pond and landscape determinants of Rana dalmatina population sizes in a Romanian rural landscape

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出版社

ELSEVIER
DOI: 10.1016/j.actao.2008.08.002

关键词

Rural landscapes; Rana dalmatina; Population sizes; Conservation; Romania

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资金

  1. Declining Amphibian Populations Task Force
  2. Swedish Biodiversity Center
  3. Mihai Eminescu Trust

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Amphibians are good indicators of human impact, declining steadily worldwide. We explored the relationships between the ponds and nearby landscape parameters and population size of the Agile Frog (Rana dalmatina), estimated from the number of egg masses, in a cultural landscape within the central section of Tarnava Mare Basin, Romania, Forty-three permanent ponds were surveyed in a 2600 km(2) area. The average number of egg masses per pond was 211.13 (SD = 426.41). The egg mass number was significantly and positively related to the emergent aquatic macrophyte cover (its effect peaks at around 50%) and the green connecting corridors between the ponds and forests, and negatively related to the extent of nearby urban areas. The proximity of the forest (positive effect) and the presence of high traffic roads (negative effect) were highly correlated with green corridors and further eliminated from the model due to multicollinearity. Both these variables had significant effects when incorporated in univariate models and multivariate models without green corridors. Since a large part of our study area was currently declared as Natura 2000 site, there is an increased need for management proposals and conservation applications for biodiversity, including amphibians. Rana dalmatina is an important species for monitoring because it is common in the studied area and is suited for short surveys. (C) 2008 Elsevier Masson SAS. All rights reserved.

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