期刊
FUNDAMENTAL AND APPLIED LIMNOLOGY
卷 185, 期 3-4, 页码 307-314出版社
E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG
DOI: 10.1127/fal/2014/0641
关键词
Competitive ability; Daphnia; cyanobacteria; zooplankton; body size; temperature
资金
- Polish Ministry of Science and Higher Education [N N305 134440]
According to the Size-Efficiency Hypothesis, when the intensity of fish predation is low, large-bodied zooplankton species are competitively superior as they are more efficient filter feeders than small-bodied species and they have relatively reduced metabolic demands per unit mass. The presence of filamentous cyanobacteria can reduce the competitive superiority of large-bodied cladocerans, because they are less resistant than small-bodied ones to interference with food collection by filaments. The viscosity of water decreases with increasing temperature which may alter the filtering mechanisms of cladocerans, making the large-bodied species even more susceptible to interference by cyanobacterial filaments. The aims of this study were (1) to test if the presence of the filamentous non-toxic cyanobacterium Cylindrospermopsis raciborskii shifts competitive dominance from a large-bodied cladoceran species towards a small-bodied one and (2) to determine whether the competitive superiority of a small-bodied species in the presence of cyanobacterial filaments is temperature-dependent. A laboratory competition experiment was conducted with large-bodied Daphnia pulicaria and small-bodied D. longispina, in the presence or absence of cyanobacteria in two different thermal regimes -18 and 25 degrees C. Unexpectedly, D. pulicaria was dominant over D. longispina, irrespective of the food and thermal treatments applied. The large-bodied Daphnia species was competitively superior even in the presence of filamentous cyanobacteria and at an elevated temperature.
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