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- W2014502794 abstract "We performed bag experiments in a Canadian Shield lake with generally high seston (suspended food particles mainly composed of algae) carbon (C):phosphorus (P) ratios, and investigated the responses of individual and population growth of herbivorous Daphnia dentifera on their abundance with (+P) and without (−P) a phosphorus enrichment to lake water. In both treatments, increased abundance of D. dentifera reduced seston C concentration and was accompanied by decreases in population and individual growth rates. However, P‐enrichment increased seston P concentration and then reduced seston C:P ratio from 400–700 to ca 100 (by atoms). As a result, both individual and population growth rates were significantly higher in the +P treatment at all animal abundances even though seston C concentrations were similar between the treatments. The magnitude of the growth enhancement by the P‐enrichment was independent of animal abundance. Stepwise regression analyses revealed that 71 and 90% of the variance in the population and individual growth rates, respectively, were explained by seston C and P concentrations, and that the contribution of the seston P concentration was roughly the same as that of seston C. Such joint effects of seston C and P indicate that food quality (P content) as well as food quantity (C concentration) can influence Daphnia not only at the level of individual growth but also at the level of population dynamics in P‐limited lakes. Our results thus strongly corroborate the hypothesis that the population development of a key herbivore Daphnia in P‐limited Canadian Shield lakes is inhibited by the direct effects of P‐limited food on individual growth, which weaken the strength of trophic cascading interactions starting from piscivorous fish through planktivorous fish and zooplankton to algae." @default.
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- W2014502794 date "2002-02-01" @default.
- W2014502794 modified "2023-10-18" @default.
- W2014502794 title "Evidence of phosphorus-limited individual and population growth of <i>Daphnia</i> in a Canadian Shield lake" @default.
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- W2014502794 doi "https://doi.org/10.1034/j.1600-0706.2002.960201.x" @default.
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