Diet of double-crested cormorants wintering in Texas

摘要: -The diets of 420 Double-crested Cormorants (Phalacrocorax auritus) were studied during November 1986-March 1987 on eight public reservoirs in Texas. Prey included 29 fish species and the mean live weight per bird was 122 g. Fishes -415 mm long ingested, but those 125 accounted for 90% cormorant food contents by number. Shad (Dorosoma spp.) sunfishes (Lepomis total items Consumption fishes (percent weight) different male vs. female adult juvenile cormorants. Total consumption consistent throughout period; however, fewer much larger consumed after 15 February. ate that most abundant reservoirs. Sport made up a substantial portion weight, not number some very few large sport fish, however. DIETA DE INDIVIDUOS PHALACROCORAX AURITUS QUE PASAN EL INVIERNO EN TEXAS Sinopsis.-De noviembre de 1986 1987, se estudi6 la dieta cormoranes en ocho reservorios p6blicos La incluy6 especies peces y el promedio peso pez vivo por ave fue Peces con longitud <415 fueron ingeridos. Aquellos tamaiio <125 formaron del contenido alimentario numero. los generos Dorosoma Lepomis las aves n6mero. El consumo (porciento peso) parte result6 diferente para machos hembras adultos juveniles. peso, uniforme traves periodo estudio. Sin embargo, despues febrero, menos pero mayor consumidos. Las consumieron que resultaron ser mas abundantes reservorios. spp. form6 una porci6n sustancial aves, no asi n6mero algunos reservorios; ingirieron muy pocas presas alto peso. I Current address: Geo-Marine, Inc. 201 Napoleon Street, Baton Rouge, Louisiana 70802 USA. 2 Cooperative Fish Wildlife Research Unit, U.S. Service, New Mexico State University, Box 30003, Dept. 4901, Cruces, 88003