Seasonal and interspecific evaluation of predation by mammals and birds on the introduced red swamp crayfish Procambarus clarkii (Crustacea, Cambaridae) in a freshwater marsh (Portugal)

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Influence of landscape characteristics on carnivore diversity and abundance in Mediterranean farmland (2009, background): “Amphibians and crayfish available in irrigation channels and ponds may also be important food resources for other carnivores (Correia, 2001; Zapata and Travaini, 2007), which may contribute to their positive responses to irrigated landscapes.”
Impact of an introduced Crustacean on the trophic webs of Mediterranean wetlands (2005, background): “For the otter, where information from four quantitative studies over more than one season is available (Adrián and Delibes 1987; Beja 1996; Correia 2001; Ruı́z-Olmo et al. 2002), the percentage of crayfish in the total amount of food varies between 1.”