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Article 6

Inter-annual and intra-seasonal patterns of abundance in a set of common waterbirds: a long-term study in a Mediterranean wetland

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L. REDOLFI DE ZAN1*, C. BATTISTI2, G. M. CARPANETO1
1 Department of Environmental Biology, Roma Tre University, Viale Marconi, 446, 00146 Rome, Italy
2 “Torre Flavia” LTER (Long Term Ecological Research) Station, Environmental Service, Province of Rome,Via Tiburtina, 691, Rome, Italy
* Corresponding author: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

ABSTRACT. – Data on phenology and abundance of a set of common water-related birds were collected in a remnant wetland of central Italy during six years, under a long-term management project. In the study area, water level fluctuated following a seasonal pattern determined by climatic and anthropogenic factors (in particular, a local fish farming activity). We detected interannual and intra-seasonal changes in values of bird abundance. A high water level in wetland channels and surrounding reed and rush beds, induced a higher availability of suitable habitats for common ducks (mallard, teal, garganey), favouring an increase in the abundance of these species. In particular, a significant correlation was found between water level and duck abundance. On the contrary, the abundance of herons (little egret, grey heron, purple heron) increased in association with a drop in water level. The latter was determined by both seasonal aridity and fish farming activities in late spring. Such a decrease of water level implies a rise in fish density and therefore its availability for herons.

You are here: Volume 61 (2011) Issue 2 Article 6
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