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Titolo:
Resource competition between sympatric sibling rotifer species
Autore:
Ciros-Perez, J; Carmona, MJ; Serra, M;
Indirizzi:
Univ Valencia, Inst Cavanilles Biodivers & Biol, E-46071 Valencia, Spain Univ Valencia Valencia Spain E-46071 ers & Biol, E-46071 Valencia, Spain
Titolo Testata:
LIMNOLOGY AND OCEANOGRAPHY
fascicolo: 6, volume: 46, anno: 2001,
pagine: 1511 - 1523
SICI:
0024-3590(200109)46:6<1511:RCBSSR>2.0.ZU;2-O
Fonte:
ISI
Lingua:
ENG
Soggetto:
BRACHIONUS-PLICATILIS MULLER; PARTICLE-SIZE; BODY SIZE; HERBIVOROUS ZOOPLANKTON; PLANKTONIC ROTIFERS; POPULATION-GROWTH; DAPHNIA; DIVERSITY; CLADOCERA; DIFFERENTIATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
65
Recensione:
Indirizzi per estratti:
Indirizzo: Ciros-Perez, J Univ Valencia, Inst Cavanilles Biodivers & Biol, AO 22085, E-46071 Valencia, Spain Univ Valencia AO 22085 Valencia Spain E-46071 encia, Spain
Citazione:
J. Ciros-Perez et al., "Resource competition between sympatric sibling rotifer species", LIMN OCEAN, 46(6), 2001, pp. 1511-1523

Abstract

Mechanisms underlying competitive interactions are important in understanding the structure of planktonic communities, particularly the coexistence of similar species. Here we present experimental results of exploitative competition among three sympatric sibling species of the Brachionus plicatiliscomplex for two differently-sized species of food microalgae. These three rotifer species are to be found in seasonal succession in brackish ponds onthe Spanish Mediterranean coast; they can, however, co-occur for long periods. The functional and numerical responses of the three Brachionus speciesto both food microalgae, although similar, differed. Neither rotifer population growth nor grazing rates showed a clear positive correlation between rotifer and alga sizes. Tilman's models were applied to these results in order to predict the outcome of competition in two rotifer, two resources systems. For testing predictions and addressing the possibility of rotifer coexistence, we performed pairwise competition experiments in semicontinuous cultures, which introduces periodic disturbance as an additional factor. Results confirmed the pattern expected from Tilman's models regarding the competitive superiority of each rotifer species, when food composition was biased toward one of the two resources. This shows the relevance of the food threshold concept to predict the superior competitor. However, coexistence ofrotifers was found in conditions in which Tilman's models had predicted anunstable equilibrium, with the winning species depending on the initial conditions. We hypothesize that variance in food availability mediated coexistence. Our results suggest that both food partitioning and disturbance are important in explaining the coexistence of these sibling species in nature.

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Documento generato il 04/12/20 alle ore 06:45:07