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  • Title: How littered are birds' of prey nests? Study of two sympatric species.
    Author: Zduniak P, Bocheński M, Maciorowski G.
    Journal: Sci Total Environ; 2021 Oct 10; 790():148079. PubMed ID: 34090160.
    Abstract:
    Anthropogenic activity results in production of wastes, including litter in the environment. The problem of waste pollution is especially noticeable and usually discussed from the perspective of marine environments. It is significantly less addressed in terrestrial habitats, where the spatial dispersion of litter makes it difficult to assess the degree of pollution and its impact on the ecosystems. In this study, we present the problem of littering the terrestrial environments in the context of their inclusion in raptor nests, which are relatively rare elements of these ecosystems and because they comprise the top positions in their trophic chains, are exemplary bioindicators. During the breeding season we quantitatively and qualitatively assessed the anthropogenic debris present in the nests of 48 Back Kites (Milvus migrans) and Red kites (Milvus milvus). We found that the prevalence of litter in the nests was 100% for both species. The average number of litter items and average total area of litter recorded per nest was 31.3 and 0.44 m2, respectively and differed between species, where higher values were recorded for the Black Kite than for the Red Kite (53.1 vs. 23.8 and 0.54 m2 vs. 0.34 m2, respectively). Taking into account the average nest surface area of both studied species (0.33 m2 and 0.57 m2, respectively), obtained values indicate large littering of the studied nests. Furthermore, 71% of identified debris items were plastics which constituted 65% of the total surface of all recorded debris. Our study suggests a high availability of litter in the terrestrial habitats that constitute the breeding territories of the two sympatric study species.
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