INTRODUCTION The zooplankton assemblages in deep, oligotrophic northern Patagonian lakes are characterized by their low species numbers and their marked dominance of calanoid copepods (Soto & Zúñiga, 1991; De los Ríos & Soto, 2006, 2007; De los Ríos-Escalante, 2011). Studies on littoral microcrustaceans in Chilean lakes are restricted to copepods and cladocerans (Araya & Zúñiga, 1985; Soto & Zúñiga, 1991), and it is probable that other crustaceans, like amphipods, are present (González, 2003) as well. Nevertheless, a correlation between total microcrustaceans (littoral and pelagic) and trophic status has not been determined until now (De los Ríos et al., 2007; De los Ríos & Roa, 2010). However, it is not clear whether there exists a regulating factor for the observed pelagic and littoral microcrustacean assemblages in lakes with a similar trophic status. To study the presence of a regulating factor, ecologists have proposed null models using presence/absence data in order to find out whether the observed distribution pattern is random or not (Gotelli, 2000, 2001; Tondoh, 2006; Tiho & Johens, 2007; Gotelli & Entsminger, 2009). Although null models have mostly been applied to terrestrial ecosystems until now (Tondoh, 2006; Tiho & Johens, 2007), recently they were also extended to
Crustaceana – Brill
Published: Jan 1, 2012
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