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dc.contributor.authorDalu, Tatenda.en_US
dc.contributor.authorCuthbert, Ross N.en_US
dc.contributor.authorWeyl, Olaf Lawrence Fredrick.en_US
dc.contributor.authorWasserman, Ryan John.en_US
dc.description.abstractMediterranean climate river systems are among the most threatened ecosystems worldwide, due to a long history of anthropogenic impacts and alien invasive species introductions. Many of such rivers naturally exhibit a non perennial flow regime, with distinct seasonal, inter-annual and spatial heterogeneity. The present study seeks to detect diatom community patterns and to understand the processes that cause these structures in an Austral Mediterranean river system among different months and river sections. In general, most environmental variables showed an increas ing trend downstream for both months, with the exception of pH, dissolved oxygen, PO₄ 3− and substrate embeddedness, which decreased downstream. A total of 110 diatom species between the two study months (October – 106 taxa; January – 78 taxa) were identified, dominated by 30 species with at least >2% abundance. Diatom com munity structure differed significantly across river zones, while no significant differences were observed between the study months. A boosted regression trees model showed that B (43.3%), Cu (20.8%), Fe (3.4%) and water depth (3.2%) were the most significant variables structuring diatoms. Diatom species communities reflected environmental variables (i.e., sediment and water chemistry) in this Mediterranean climate river system, as sediment metals such as B, Cu and Fe were found to be important in structuring diatom communities. Biotic influences from fish communities had little effect on diversity, but shifted diatom community structure. Therefore, the current study highlights how river sys tems have complex interactions that play an important role in determining diatom species composition.en_US
dc.relation.ispartofScience of the Total Environmenten_US
dc.subjectBiological invasion.en_US
dc.subjectFreshwater ecosystem.en_US
dc.subjectKrom River.en_US
dc.subjectMediterranean climate.en_US
dc.subjectBoosted regression trees.en_US
dc.titleCommunity structure and environmental factors affecting diatom abundance and diversity in a Mediterranean climate river system.en_US
dc.typejournal articleen_US
dc.contributor.affiliationSchool of Biology and Environmental Sciencesen_US
dc.contributor.affiliationSouth African Institute for Aquatic Biodiversityen_US
dc.contributor.affiliationSouth African Institute for Aquatic Biodiversityen_US
dc.contributor.affiliationRhodes Universityen_US
item.openairetypejournal article-
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