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Letna Dinamika Pojavljanja Vodnih Ptic Na Reki Dravi Med Mariborskim Jezerom In Jezom Melje (Sv Slovenija) / Yearly dynamics of waterbirds’ occurrence on the Drava River between Lake Maribor and Melje Dam (NE Slovenia)

Abstract

Between April 2007 and April 2008, 40 systematic waterbird counts were conducted on the Drava River between Lake Maribor and the Melje Dam (length 8.5 km, area 155 ha) to determine the specific composition, abundance and seasonal dynamics of bird occurrence. Between October and May, counts were conducted every week, whereas between June and September they were carried out once every two weeks. In total, 26,803 individuals of 30 species were counted. The number of waterbirds and diversity of species were the highest from late December to late February, when more than 1,000 individuals were regularly present in the area. Waterbirds were distributed along the river unequally, with the highest number of birds present yearround in the city centre and in the first counting sector of Lake Maribor. The Mallard Anas platyrhynchos and Mute Swan Cygnus olor were recorded during every count, while occurrence frequency was greater than 50% in another 10 species. Dominant species in terms of percentage composition were Mallard, Black-headed Gull Chroicocephalus ridibundus, Coot Fulica atra, Mute Swan, Pochard Aythya ferina and Tufted Duck Ay. fuligula. Mute Swan and Mallard were the only breeding waterbirds in the study area. Both the total number of waterbirds and the highest daily total in the first two counting sectors were greater between October and March 1992/93 than in our study. The decline in numbers was the greatest for Mallard, Pochard and Tufted Duck, while an increase was noted in Mute Swan and Yellow-legged / Caspian Gull Larus michahellis / cachinnans. The total number of waterbirds and the number of some species in the study area were significantly higher than expected solely based on its length compared to the length of the lowland Drava in Slovenia (125.7 km). The study area is conservationally important for Pochard, Tufted Duck and Black-headed Gull

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Vodne ptice in ujede Cerkniškega polja (južna Slovenija) v letih 2007 in 2008, s pregledom zanimivejših opazovanj do konca leta 2010 / Waterbirds and raptors of Cerknica polje (southern Slovenia) in 2007 and 2008, with an overview of interesting observations till the end of 2010

. - Acrocephalus 17 (78/79): 163. Kus, J. (2001): Rumena pastirica Motacilla flava na Cerkniškem polju. - Acrocephalus 22 (104/105): 23-28. Legiša, P. (1999): Mali deževnik Charadrius dubius . - Acrocephalus 20 (92): 32. Legiša, P. (2009): Duplinska kozarka Tadorna tadorna . - Acrocephalus 30 (140): 38. Logar, K. (2009): Dinamika pojavljanja vodnih ptic na reki Dravi od Brestrniškega jezera do Meljskega jezu. Diplomsko delo. - Univerza v Ljubljani, Biotehniška fakulteta, Oddelek za biologijo

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Waterbirds and raptors occurring in the area of Medvedce reservoir (Dravsko polje, NE Slovenia) during the 2002-2008 period

): Črni škarnik Milvus migrans . - Acrocephalus 25 (122): 162. Bordjan, D. (2004b): Pritlikavi kormoran Phalacrocorax pygmeus . - Acrocephalus 25 (123): 223. Bordjan, D. (2004c): Mali galeb Larus minutus . - Acrocephalus 25 (123): 226. Bordjan, D. (2005a): Plevica Plegadis falcinellus . - Acrocephalus 26 (124): 47. Bordjan, D. (2005b): Črna štorklja Cicinia nigra . - Acrocephalus 26 (127): 197. Bordjan, D. (2006a): Dinamika

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The Curlew Numenius arquata population size and distribution at Ljubljansko barje in 2011 and 2012

. BirdLife International (2012): Species factsheet: Numenius arquata. - [http://www.birdlife.org/datazone/speciesfactsheet.php?id=3012], 17/01/2012. Bordjan, D. (2006): Dinamika pojavljanja velikega škurha Numenius arquata na zadrževalniku Medvedce (SV Slovenija) med letoma 2002 in 2005. - Acrocephalus 27 (130/131): 131-137. Bordjan, D. (2012): Vodne ptice in ujede Cerkniškega polja (južna Slovenija) v letih 2007 in 2008, s pregledom zanimivejših opazovanj do konca leta 2010. - Acrocephalus 33 (152/153): 25-104. Bordjan, D

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Spring migration of waterbirds and raptors at Medvedce reservoir (Dravsko polje, NE Slovenia)/ Spomladanska selitev vodnih ptic in ujed na zadrževalniku Medvedce (Dravsko polje, SV Slovenija)

-97. - Bird Study 47 (2): 195-211. Leitão D., Peris S. (2004): The origin of Lapwings Vanellus vanellus and Golden Plovers Pluvialis apricaria wintering in Portugal. - Ornis Fennica 81 :49-64. Leshem Y., Yom-Tov Y. (1998): Routes of migrating soaring birds. - Ibis 140: 41-52. Limiñana R., Soutullo A., Urios V. (2007): Autumn migration of Montagu’s harriers Circus pygargus tracked by satellite telemetry. - Journal of Ornithology 148: 517-523. Logar K., Božič L. (2014): Letna dinamika pojavljanja vodnih ptic na

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Annual dynamics, nature-conservancy evaluation and an overview of data on the occurrence of waterbirds at Šaleška Lakes (N Slovenia)

. (2014): Letna dinamika pojavljanja vodnih ptic na reki Dravi med Mariborskim jezerom in jezom Melje (SV Slovenija). - Acrocephalus 35 (160/161): 5-23. Luniak M. (2004): Synurbization - adaptation of animal wildlife to urban development. pp 50-55. In: Shaw W. W., Harris L. K., Vandruff L. (eds.): Proceedings of the 4th international symposium on urban wildlife conservation. - Tucson, Arizona. Livezey K. B., Fernández-Juricic E., Blumstein D. T. (2016): Database of Bird Flight Initiation Distances to Assist in Estimating Effects from

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