Author/Editor		Govedič, Marijan; Janžekovič, Franc; Kos, Ivan
Title		Prehrana kormorana Phalacrocorax carbo na območju reke Save od Ljubljane do Zagorja (Slovenija)
Translated title		The diet of great cormorants Phalacrocorax carbo on the Sava river between Ljubljana and Zagorje (Slovenia)
Type		članek
Source		Acrocephalus
Vol. and No.		Letnik 23, št. 110-111
Publication year		2002
Volume		str. 5-18
Language		slo
Abstract		Diet of Great Cormorants Phalacrocorax carbo occurring on the Sava river between Ljubljana and Zagorje was studied in the winter 1998/99 by means of regurgitated pellets, collected at the Cormorants' night roost at Hotič. Among 473 collected pellets, 69.8 % contained remains of fish. The pellets also contained worms Nematoda and tapeworms Cestoda, remains of caddis flies Trichoptera, snails Gastropoda and a frog Rana sp. In separate pellets, remains of 1 to 69 fish (median 2, average 3.9) were found: in 41.8 % pellets remains of 1 fish, in 93.6 % remains of up to 10 fish. Altogether, remains of 1,288 fish were found. Length and weight were determined for 1,279 of them. Total weight of these fish was estimated at 57 kg. The diet consisted of 12 fish species (trout Salmo trutta, grayling Thymallus thymallus, chub Leuciscus cephalus, nase Chondrostoma nasus, danube roach Rutilus pigus virgo, roach Rutilus rutilus, barbel Barbus barbus, bream Abramis brama, bleak Alburnus alburnus, pike Esox lucius, perch Perca fluviatilis and ruffe Gymnocephalus cernuus). The diet was dominated by Cyprinidae (85.8 % by number, 90.5 % by biomass). Grayling and trout were represented with 6.5 % by number and 3.6 % by mass and pike, perch and ruffe in 7.3 % by number and 3.6 % by mass. Inside Cyprinidae chub with 16.4 % by number and 38.6 % by biomass and nase with 3.9 % by number and 16.5 % by biomass were most frequent. The proportion of undetermined Cyprinidae was 57.1 % by number and 28.5 % by mass. Prey size ranged from 23 to 345 mm. Most frequent length class was 70-170 mm (50 % by number and 19 % by mass), but large individuals (> 170 mm) were most important (25. (Abstract truncated at 2000 characters)
Summary		Avtorji so z analizo izbljuvkov ugotavljali prehrano kormoranov Phalacrocorax carbo, ki so se prehranjevali na območju reke Save od Ljubljane do Zagorja v zimi 1998/99. Izbljuvke so pobirali na prenočišcu pri Hotiču. Izmed 473 izbljuvkov so bili v 69,8 % ostanki rib. V izbljuvkih so bile tudi gliste Nematoda in trakulje Cestoda ter ostanki mladoletnic Trichoptera, polžev Gastropoda in ene žabe Rana sp.. V izbljuvku so bili ostanki 1 do 69 rib (Mediana 2, Povprečje 3,9). V 41,8 % izbljuvkov je bila samo ena riba, v 93.6 % izbljuvkov pa do 10 rib. Našli so ostanke 1288 osebkov rib. 1279 osebkom so določili dolžino in maso. Skupaj so tehtali 57 kg. Določili so 12 vrst rib. V izbljuvkih so našli ostanke lipana Thymallus thymallus, postrvi Salmo trutta, klena Leuciscus cephalus, podusti Chondrostoma nasus; platnice Rutilus pigus virgo, rdečeoke Rutilus rutilus, navadne mrene Barbus barbus, ploščiča Abramis brama, zelenike Alburnus alburnus, ščuke Esox lucius, navadnega ostriža Perca fluviatilis in navadnega okuna Gymnocephalus cernuus. V prehrani so prevladovali krapovci Cyprinidae (85,8 % po številu in 90,5 % po masi). Lipan in postrv sta sestavljala 6,5 % po številu in 3,6 % po masi ter ščuka in navadni ostriži 7,3 % po številu in 3,6 % po masi. Znotraj krapovcev sta bila najpogostejša klen (16,4 % po številu in 38,6 % po rnasi) in podust (3,9 po številu in 16,5 % po masi). Delež nedoločenih krapovcev je bil 57,1 % po številu in 28,5 % po masi. Dolžina rib je bila od 23 do 345 mm. (Izvleček skrajšan na 2000 znakov)
Descriptors		BIRDS ANIMAL NUTRITION FISHES BIOMASS SEASONS