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Effects of eutrophication and temperature on C yclotella rhomboideo‐elliptica S kuja, endemic diatom to C hina
Author(s) -
Li Yanling,
Gong Zhijun,
Shen Ji
Publication year - 2012
Publication title -
phycological research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.438
H-Index - 44
eISSN - 1440-1835
pISSN - 1322-0829
DOI - 10.1111/j.1440-1835.2012.00659.x
Subject(s) - diatom , nutrient , biology , eutrophication , abundance (ecology) , population , ecology , botany , demography , sociology
Summary An endemic diatom, C yclotella rhomboideo‐elliptica S kuja, from the Y unnan P lateau, has been disappearing gradually from some lakes of the plateau. This study investigated the diatom's distribution in 30 lakes and documents long‐term population changes in the paleolimnological record of a deep lake, L ake F uxian. Living cells of C . rhomboideo‐elliptica were found in five Y unnan P lateau lakes in 1957, but cells were restricted to L ake F uxian in 2005. Its absolute abundance fluctuated from low to high to low. Our study suggests that nutrient concentrations correlate with C . rhomboideo‐elliptica 's s abundance and survival. We infer that the disappearance of C . rhomboideo‐elliptica in some lakes may be due to increased nutrient concentrations and the species may be indicators of low nutrients. During the study, we also found that decreased in the diatoms average long axis length after the early 1990s. This morphological change was likely due to higher nutrient concentrations or to the increase in temperature, or a combination of the two.