Regulatory factors in crustacean zooplankton assemblages in mountain lakes of northern Chilean Patagonia (38-41°S): a comparison with Bulgarian counterparts (42°N)

Patricio de Los Ríos, Enrique Hauenstein, Patricio Acevedo A. and Mario Romero
LATIN AMERICAN JOURNAL OF AQUATIC RESEARCH 40, 2 (2012)

ABSTRACT

Chilean Patagonia has protected mountainous areas with evergreen native forests; in which the
lakes and rivers, of volcanic or glacial origin, are oligotrophic. In Bulgaria, there are mountainous zones with
native forests and associated lakes of volcanic origin. The aim of the present study is to carry out a preliminary
comparison of zooplanktonic crustaceans in lake ecosystems associated with native forests of Chilean
Patagonia and of Bulgarian mountains. The study revealed that the lakes studied in Chilean Patagonia are
associated mainly with Nothofagus forests; they are oligotrophic, with a low number of zooplanktonic
crustacean species. Similar results were observed for Bulgarian mountain lakes associated with Fagus forests.
A null model analysis of species co-occurrence was applied to the two groups of lakes, and the result revealed
the absence of regulatory factors in species associations. These studies agree with similar descriptions of lakes
in Andean Patagonia and New Zealand. They highlight the important role of native Nothofagus forests in
Argentina and Chile, and of Fagus forests with associated soil properties in Bulgaria, in the oligotrophy of the
lakes studied.

DOI: http://dx.doi.org/10.3856/vol40-issue2-fulltext-24



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