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The niche space of a species has been defined as the region in N-dimensional\udenvironmental hyperspace in which the fitness of the individuals is positive. In zooplankton\udassemblages, there has been little consideration of how different density-dependent (i.e. resources)\udand density-independent (i.e. conditions) environmental factors relate to fitness components in the\udfield, namely survival and reproduction. We studied the abundance and reproduction (egg ratio)\udvariability of seven species of pelagic rotifers living in a high-mountain lake and their relation to a\udnumber of environmental factors by means of partial canonical correspondence analyses. The\udgenerally higher explanatory capacity of conditions over resources suggests that habitat\udpartitioning among species largely relies on historical processes, which are internalised in life\udhistory traits of spatial and temporal habitat use. However, the increase in the relevance of\udresources when considering reproduction, as compared to abundance, indicates that there is still an\udon-going interactive niche segregation process among rotifer species, which affects present and\udfuture rotifer assemblages in the lake. Our study shows the value of considering measurements\udclose to fitness components (e.g. egg ratio) for detecting on-going niche segregation processes in\udzooplankton, which may help to resolve paradoxes in relation to species coexistence in natural\udassemblages.Peer reviewe

Niche segregation factors in an assemblage of pelagic rotifers of a deep high-mountain lake (Redon, Pyrenees)