Hranidbeni tipovi oblića u eulitoralu Sakadaškog jezera (Park prirode Kopački rit, Hrvatska)

Abstract

A total of 45 nematode species was found at the investigated sites of the eulittoral of Lake Sakadaš during 1998: 12 deposit-feeders (bacterial feeders), six epistrate-feeders (algal feeders), eight chewers (predators/omnivorous), and 19 suction-feeders (plant feeders/omnivorous). Chewers were the major group of nematofauna at the eulittoral of Lake Sakadaš – they comprised 68.28% of total nematofauna at submerged site A, 70.13% at site B (at the land-water interface), and 54.16% at emerged site C. The highest relative abundance within the chewers group was found in Brevitobrilus stefanskii, Mononchus aquaticus and Tobrilus gracilis at sites A and B, and B. stefanskii, M. aquaticus and Paramononchus sp. at site C. Suction-feeders were the next important nematofauna group: 19.98% at site A, 23.60% at site B, and 36.97% at the site C, followed by deposit-feeders (5.98–11.78%), whereas epistrate-feeders had the lowest abundance (<2%). Irregularities in the water level and the quantity of food available had the major influence on changes in the distribution of nematode feeding-types.Na istraživanim postajama u eulitoralu Sakadaškog jezera tijekom 1998. godine ukupno je utvrđeno 45 vrsta oblića: 12 »gutača« (bakteriofagnih vrsta), šest »kidača-gutača« (algivornih vrsta), osam »žvakača« (predatora/omnivora) i 19 »isisavača« (fitofaga/omnivora). »Žvakači« su bili osnovna skupina koja je obilježavala faunu oblića u eulitoralu Sakadaškog jezera – činili su 67.28% ukupne nematofaune na submerznoj postaji A, 70.13% na postaji B (na kontaktu vode i kopna) te 54.16% na emerznoj postaji C. Najveća relativna gustoća utvrđena je za »žvakače«: Brevitobrilus stefanskii, Mononchus aquaticus i Tobrilus gracilis na postajama A i B, a na postaji C za B. stefanskii, M. aquaticus i Paramononchus sp. Iduća po značajnosti bila je skupina »isisavača«: 19.98% na postaji A, 23.60% na postaji B te 36.97% na postaji C. Manje su bili zastupljeni »gutači« (5.98–11.78%) i najmanje »kidači-gutači« (<2%). Na promjene u trofičkoj strukturi oblića najveći su utjecaj imali fluktuacije nivoa vode i količina raspoložive hrane u sedimentu

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