@article {5344, title = {Effect of water level fluctuations on wading bird foraging habitat use at an irrigation reservoir, Lake Kerkini, Greece}, journal = {Colonial WaterbirdsColonial Waterbirds}, volume = {20}, number = {2}, year = {1997}, note = {TY - JOURCited By (since 1996): 5Export Date: 7 September 2006Source: ScopusReferences: Babalonas, D., Papastergiadou, E., The the water fern Salvinia natans (L.) 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Gerakis, Ed.), Thessaloniki, Greece; Kushlan, J.A., Wading birds predation in a seasonally fluctuating pond (1976) Auk, 93, pp. 464-476; Kushlan, J.A., Feeding ecology of wading birds (1978) Wading Birds, pp. 249-295. , (A. Sprunt, J. C. Odgen and S. Winckler, Eds.). Research Report No. 7, National Audubon Society, New York; Kushlan, J.A., Resource use strategies of wading birds (1981) Wilson Bulletin, 93, pp. 145-163; Kushlan, J.A., Responses of wading birds to seasonally fluctuating water levels: Strategies and their limits (1986) Colonial Waterbirds, 9, pp. 155-162; Kushlan, J.A., Colonial waterbirds as bioindicators of environmental change (1993) Colonial Waterbirds, 16, pp. 223-251; Papanastasis, V., Natural vegetation of the Lake Kerkini (1989) Proceedings of a 1989 Workshop on Greek Wetlands, pp. 257-261. , (P. Gerakis, Ed.), Thessaloniki, Greece; Papastergiadou, E., (1990) Phytosociological and Ecological Studies of Aquatic Macrophytes (Hydrophytes) in Northern Greece, , Ph.D. thesis, Aristotle University of Thessaloniki, Greece (in Greek); Papastergiadon, E., Babalonas, D., Ecological studies on aquatic macrophytes of a dam lake-Lake Kerkini, Greece (1992) Archiv fu?r Hydrobiologie Supplement, 90, pp. 1-20; Psilovikos, A., (1992) Research on the Problem of Sedimentation of Lake Kerkini and the Strymon River, , Scientific report of a research project, Aristotle University of Thessaloniki, Greece (in Greek); Pyrovetsi, M., (1990) Conservation and Management of the Biotopes of the Dalmatian Pelican (Pelecanus Crispus) in Northern Greece, , Commission of European Communities (DGXI) and Aristotle University of Thessaloniki, Greece; Pyrovetsi, M., Papastergiadou, E., Biological conservation implications of water-level fluctuations in a wetland of international importance: Lake Kerkini, Macedonia, Greece (1992) Environmental Conservation, 19, pp. 235-244; Pyrovetsi, M., Papazahariadou, M., Mortality factors of Dalmatian Pelicans (Pelecanus crispus) wintering in Macedonia, Greece (1995) Environmental Conservation, 22, pp. 345-351; Richardson, J.R., Harris, T.T., Williges, K.A., Vegetation response to various environmental parameters in the Lake Okeechobee marsh ecosystem (1995) Archiv fu?r Hydrobiologie Special Issues in Advanced Limnology, 45, pp. 41-61; Smith, J.P., Foraging flights and habitat use of nesting wading birds (Ciconiiformes) at Lake Okeechobee, Florida (1995) Colonial Waterbirds, 18, pp. 139-158; Smith, J.P., Richardson, J.R., Collopy, M.W., Foraging habitat selection among wading birds (Ciconiiformes) at Lake Okeechobee, Florida, in relation to hydrology and vegetative cover (1995) Archiv fu?r Hydrobiologie Special Issues in Advanced Limnology, 45, pp. 247-285; Sokal, R.R., Rohlf, F.J., (1981) Biometry. 2nd Ed., , Freeman, New York; Tatarakis, E., Fisheries management at Lake Kerkini (1995) Sustainable Management of the Water of Lake Kerkini, pp. 97-108. , (K. Skordas and M. Anagnostopoulou, Eds.), Greek Biotope/Wetland Center (EKBY), Thessaloniki, Greece; Tsachalidis, E.P., (1990) Reproductive Biology and Behavioral Ecology of Little Egret (Egretta Garzetta) in the Artificial Lake Kerkini, Serres, , Ph.D. thesis, Aristotle University of Thessaloniki, Greece (in Greek); Vouvalidis, C., (1991) Limnological Study of Lake Kerkini, , Graduate thesis, University of Thessaloniki, Greece (in Greek).}, month = {1997///}, pages = {244-252}, abstract = {Lake 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{\textquoteright} 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.}, keywords = {Ardea alba, Ardea cinerea, Aves, Ciconiiformes, Egretta garzetta, Foraging habitat, Greece, Impoundment, Lake Kerkini, Wading birds}, author = {Dimalexis, A. and Pyrovetsi, M.} } @article {5345, title = {Foraging ecology of the Grey Heron (Ardea cinerea), Great Egret (Ardea alba) and Little Egret (Egretta garzetta) in response to habitat, at 2 Greek wetlands}, journal = {Colonial WaterbirdsColonial Waterbirds}, volume = {20}, number = {2}, year = {1997}, note = {TY - JOURCited By (since 1996): 6Export Date: 7 September 2006Source: ScopusReferences: Cezilly, F., Boy, V., Age related differences in foraging Little Egrets, Egretta garzetta (1988) Colonial Waterbirds, 11, pp. 100-106; Cezilly, E., Boy, V., Hafner, H., Group foraging in Little Egrets (Egretta garzetta): From field evidence to experimental investigation (1990) Behavioural Processes, 21, pp. 69-80; Draulans, D., The effect of prey density on foraging behaviour and success of adult and first-year Grey Herons (Ardea cinerea) (1987) Journal of Animal Ecology, 56, pp. 479-493; Draulans, D., Van Vessem, J., Symons, F., Multivariate analysis of factors affecting foraging success of Grey Herons (Ardea cinerea) at a fish-farm in winter (1986) Annals of the Belgian Zoological Society, 116, pp. 247-261; Erwin, R.M., Feeding behavior and ecology of colonial waterbirds: A synthesis and concluding comments (1983) Colonial Waterbirds, 6, pp. 73-82; Erwin, R.M., Hafner, H., Dugan, P., Differences in the feeding behavior of Little Egrets (Egretta garzetta) in two habitats in the Camargue, France (1985) Wilson Bulletin, 97, pp. 534-538; Fasola, M., Resource use of foraging herons in agricultural and nonagricultural habitats in Italy (1986) Colonial Waterbirds, 9, pp. 139-148; Fasola, M., Rosa, P., Canova, L., The diets of Squacco Herons, Little Egrets, Night, Purple and Grey Herons in their Italian breeding range (1993) Revue Ecologie (Terre et Vie), 48, pp. 35-47; Hafner, H., (1977) Contribution a l{\textquoteright}Etude Ecologique de Quatre Especes de Herons (Egretta G. Garzetla L., Ardeola R. Ralloides Scop., Ardeola I. Ibis L., Nycticorax N. Nycticorax L.) Pendant Leur Nidification en Camargue, , M.S. thesis, Toulouse, France; Hafner, H., Boy, V., Gory, G., Feeding methods, flock size and feeding success in the Little Egret, Egretta garzetta and the Squacco Heron, Ardeola ralloides, in Camargue, Southern France (1982) Ardea, 70, pp. 45-54; Hafner, H., Dugan, P.J., Boy, V., Use of artificial and natural wetlands as feeding sites by Little Egrets (Egretta garzetta) in the Camargue, southern France (1986) Colonial Waterbirds, 9, pp. 149-154; Horn, C.W., Foraging ecology of herons in a southern San Francisco Bay salt marsh (1983) Colonial Waterbirds, 6, pp. 37-44; Hutto, R.L., Measuring the availability of food resources (1993) Studies in Avian Biology, 13, pp. 20-28; (1987) Directory of Wetlands of International Importance, , Gland, Switzerland and Cambridge; Karteris, M.A., Pyrovetsi, M., Land cover/use analysis of Prespa National Park, Greece (1986) Environmental Conservation, 13, pp. 319-330; Kent, D.M., Foraging efficiency of three Egrets (1986) Colonial Waterbirds, 9, pp. 81-85; Kent, D.M., Foraging behavior, habitat use, and food of three egrets in a marine habitat (1986) Colonial Waterbirds, 9, pp. 25-30; Kent, D.M., Effects of varying behavior and habitat on the striking efficiency of egrets (1987) Colonial Waterbirds, 10, pp. 115-119; Kersten, M., Britton, R.H., Dugan, P.J., Hafner, H., Flock feeding and food intake in Little Egrets: The effects of prey distribution and behaviour (1991) Journal of Animal Ecology, 60, pp. 241-252; Kushlan, J.A., Wading bird predation in a seasonally fluctuating pond (1976) Auk, 93, pp. 464-476; Kushlan, J.A., Feeding ecology of wading birds (1978) Wading Birds, pp. 249-296. , (A. Sprunt, J. C. Ogden and S. Winckler, Eds.), Research Report No 7. National Audubon Society, New York; Kushlan, J.A., Resource use strategies of wading birds (1981) Wilson Bulletin, 93, pp. 145-163; Kushlan, J.A., Responses of wading birds to seasonally fluctuating water levels: Strategies and their limits (1986) Colonial Waterbirds, 9, pp. 155-162; Master, T.L., Frankel, M., Russell, M., Benefits of foraging in mixed species wader aggregations in a southern New Jersey saltmarsh (1993) Colonial Waterbirds, 16, pp. 149-157; Mitch, W.J., Gosselink, J.G., (1986) Wetlands, , Van Nostrand Reinhold, New York; Moser, M.E., Prey profitability for adult Grey Herons Ardea cinerea and the constraints on prey size when feeding young nestlings (1986) Ibis, 128, pp. 392-405; Norberg, R., An ecological theory on foraging time and energetics and choice of optimal foodsearching method (1977) Journal of Animal Ecology, 46, pp. 511-529; Pyrovetsi, M., Crivelli, A.J., Habitat use by waterbirds in Prespa National Park, Greece (1988) Biological Conservation, 45, pp. 135-153; Pyrovetsi, M., Papastergiadou, E., Biological conservation implications of water-level fluctuations in a wetland of international importance: Lake Kerkini, Macedonia, Greece (1992) Environmental Conservation, 19, pp. 235-244; Quinney, T.A., Smith, P.C., Comparative foraging behavior and efficiency of adult and juvenile Great Blue Herons (1980) Canadian Journal of Zoology, 58, pp. 1168-1173; Recher, H.F., Recher, J.A., Comparative foraging behavior of adult and immature Little Blue Herons (1969) Animal Behaviour, 17, pp. 320-322; Recher, H.F., Recher, J.A., Why are there different kinds of herons? (1980) Transactions of the Linnaean Society of New York, 9, pp. 135-158; Recher, H.R., Holmes, R.T., Davis Jr., W.E., Morton, S., Foraging behavior of Australian herons (1983) Colonial Waterbirds, 6, pp. 1-10; Richardson, J.R., Harris, T.T., Williges, K.A., Vegetation response to various environmental parameters in the Lake Okeechobee marsh ecosystem (1995) Archiv fur Hydrobiologie Special Issue in Advanced Limnology, 45, pp. 41-61; Rodgers Jr., J.A., Foraging behavior of seven species of herons in Tampa Bay, Florida (1983) Colonial Waterbirds, 6, pp. 11-23; Smith, J.P., Richardson, J.R., Collopy, M.W., Foraging habitat selection among wading birds (Ciconiiformes) at Lake Okeechobee, Florida, in relation to hydrology and vegetative cover (1995) Archiv fur Hydrobiologie Special Issues in Advanced Limnology, 45, pp. 247-285; Sokal, R.R., Rohlf, F.J., (1981) Biometry, 2nd Ed., , Freeman, New York; Tatarakis, E., Fisheries management at Lake Kerkini (1995) Sustainable Management of the Water of Lake Kerkini, pp. 97-108. , (K. Skordas and M. Anagnostopoulou, Eds.). Greek Biotope/Wetland Centre (EKBY), Thessaloniki, Greece; Van Vessem, J., Draulans, D., Spatial distribution and time budget of radio-tagged Grey Herons Ardea cinerea, during the breeding season (1987) Journal of Zoology, 213, pp. 507-534; Wiggins, D.A., Foraging success and aggression in solitary and group feeding Great Egrets (Casmerodius albus) (1991) Colonial Waterbirds, 14, pp. 176-179.}, month = {1997///}, pages = {261-272}, abstract = {We 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{\textquoteright} foraging.}, keywords = {Ardea alba, Ardea cinerea, Aves, Egretta garzetta, Foraging behavior, Foraging efficiency, Foraging habitat, Greece, Lake Kerkini, Lake Prespa, Wading birds}, author = {Dimalexis, A. and Pyrovetsi, M. and Sgardelis, S.} }