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JPR Advance Access published online on March 3, 2008
Journal of Plankton Research, doi:10.1093/plankt/fbn033
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© The Author 2008. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

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

Frederic Bartumeus1 and Jordi Catalan2,*

1 Department of Ecology and Evolutionary Biology & Princeton Environmental Institute. 106 Guyot Hall. Princeton University. 08544 Princeton, NJ, USA 2 Limnology Unit, Centre for Advanced Studies of Blanes (CEAB), Spanish Research Council (CSIC), Blanes, Spain.

* Corresponding author: Jordi Catalan, Centre d'Estudis Avançats de Blanes (CEAB, CSIC), C/Accés a la Cala Sant Francesc 14, 17300 Blanes, Spain, Tel: 34-972336101, Fax: 34-972337806, Email: catalan{at}ceab.csic.es

Received on November 6, 2007; revised on February 18, 2008; accepted on February 26, 2008


  Abstract

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

Key Words: habitat partition • variance partitioning • egg ratio • conditions • resources

Communicating Editor: Dr Roger Harris


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