02108nas a2200265 4500008004100000245012400041210006900165260001200234300001200246490000700258520124700265653001501512653001801527653000901545653001801554653002101572653002101593653001101614653001601625653001701641653001701658100001801675700001801693856013101711 1997 eng d00aEffect of water level fluctuations on wading bird foraging habitat use at an irrigation reservoir, Lake Kerkini, Greece0 aEffect of water level fluctuations on wading bird foraging habit c1997/// a244-2520 v203 aLake Kerkini, a Ramsar site in Macedonia, Greece, is an irrigation reservoir with water level fluctuations exceeding 5 m annually. We determined the effect of water level fluctuations on the area of available Ciconiiformes' foraging habitat at low, intermediate and high lake stages. Log-linear analysis assessed the changes in the patterns of foraging habitat use by Great Egrets, Little Egrets and Grey Herons in response to the interactions of foraging habitat type and lake stage. At low lake stage Ciconiiformes mainly foraged in non-vegetated habitats or in lacustrine and palustrine habitats with submerged vegetation, while at intermediate lake stages they used palustrine habitats with emergent or submerged vegetation. At high lake stage birds shifted to riverine habitats that constituted the main available foraging grounds. The coexistence of three wetland systems enhances habitat heterogeneity at Lake Kerkini and enables large heron populations to thrive, despite the relatively small foraging area compared to other Mediterranean wetlands. Only Great Egrets seem to face constraints related to the limited availability of marshes - habitats linked to the species feeding and nesting requirements - during the breeding period.10aArdea alba10aArdea cinerea10aAves10aCiconiiformes10aEgretta garzetta10aForaging habitat10aGreece10aImpoundment10aLake Kerkini10aWading birds1 aDimalexis, A.1 aPyrovetsi, M. uhttps://icgf.myspecies.info/content/effect-water-level-fluctuations-wading-bird-foraging-habitat-use-irrigation-reservoir-lake02235nas a2200289 4500008004100000245018200041210006900223260001200292300001200304490000700316520124700323653001501570653001801585653000901603653002101612653002201633653002401655653002101679653001101700653001701711653001601728653001701744100001801761700001801779700001801797856013001815 1997 eng d00aForaging ecology of the Grey Heron (Ardea cinerea), Great Egret (Ardea alba) and Little Egret (Egretta garzetta) in response to habitat, at 2 Greek wetlands0 aForaging ecology of the Grey Heron iArdea cinereai Great Egret i c1997/// a261-2720 v203 aWe studied the responses of 3 heron species, Grey Heron (Ardea cinerea), Great Egret (A. alba) and Little Egret (Egretta garzella) to different foraging habitats in 2 Greek wetlands of international importance, Lakes Mikri Prespa and Kerkini, These lakes are different in their hydrology, productivity and vegetation cover. Parameters of foraging tactics - such as strike rate, foraging effort expended per min and effort expended per strike - as well as parameters of foraging efficiency - such as striking efficiency, captures per unit effort and biomass intake per unit effort - were analyzed in relation to habitat and lake. Each species adopted different tactics and achieved variable efficiencies in response to the particular lake, habitat conditions and prey characteristics. Little Egrets revealed the greatest plasticity in their foraging repertoire, especially with regard to their mobility and prey preference. Great Egrets and Grey Herons consumed larger amounts of biomass per unit effort than did Little Egrets, with Great Egrets achieving the highest striking efficiency. Riverine habitats proved to be more profitable than marshes for all 3 species, while wet meadows seemed to play a complementary role for herons' foraging.10aArdea alba10aArdea cinerea10aAves10aEgretta garzetta10aForaging behavior10aForaging efficiency10aForaging habitat10aGreece10aLake Kerkini10aLake Prespa10aWading birds1 aDimalexis, A.1 aPyrovetsi, M.1 aSgardelis, S. uhttps://icgf.myspecies.info/content/foraging-ecology-grey-heron-ardea-cinerea-great-egret-ardea-alba-and-little-egret-egretta