Abstract
Hungarian sodic water bodies have a rich macro- and microcrustacean fauna due to the lack of fish populations. The crustacean population is very abundant, for this reason these wetlands provide good feeding resources for waterbirds. The density of macro- and microcrustacean populations together with feeding waterbirds was investigated in March, April, and May of 2002, on two characteristic sodic pans, “Kelemen-szé k” and “Zab-szé k”. The following dabbling-filtering waterfowls and pelagic forager wader species were counted: northern pintail (Anas acuta), northern shoveler (Anas clypeata), garganey (Anas querquedula), common teal (Anas crecca), avocet (Recurvirostra avosetta), spotted redshank (Tringa erythropus), greenshank (Tringa nebularia), and marsh sandpiper (Tringa stagnatilis). The dominant macro-crustacean species was the [Anostraca - Branchinectidae] natronophile Branchinecta orientalis, and its density was significantly higher in Zab-szé k than in Kelemen-szé k. The microcrustacean zooplankton community was also different in the pans, [Cladocera] Daphnia magna density was significantly higher in Kelemen-szé k than in Zab-szé k, but the density of the [Copepoda] natronophile Arctodiaptomus spinosus, was higher in Zab-szé k than in Kelemen-szé k. The density of the investigated waterbird species was also significantly higher in Zab-szé k than in Kelemen-szé k during spring. We can conclude that the macro-crustacean B. orientalis is one of the most important potential food resources for migrating pelagic foraging waders in spring on characteristic Hungarian sodic pans. However, the most abundant available food item for waterbirds are copepod microcrustacean zooplankton, which have a biomass that is larger by approximately one order of magnitude than the macrocrustacean zooplankton biomass. Considering the lack of submerged water vegetation, we suggest that planktonic microcrustaceans are an important food resource for dabbling-filtering ducks because they can utilise the small crustacean biomass more effectively than the less abundant and rapidly moving macrocrustacean B. orientalis.
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Boros, E., BÁnfi, S., Forró, L. (2006). Anostracans and microcrustaceans as potential food sources of waterbirds on sodic pans of the Hungarian plain. In: Hanson, A.R., Kerekes, J.J. (eds) Limnology and Aquatic Birds. Developments in Hydrobiology, vol 189. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-5556-0_25
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