Has the role of the substratum been underestimated for algal distribution patterns in freshwater ecosystems?
作者:
EileenJ Cox,
期刊:
Biofouling
(Taylor Available online 1988)
卷期:
Volume 1,
issue 1
页码: 49-63
ISSN:0892-7014
年代: 1988
DOI:10.1080/08927018809378095
出版商: Taylor & Francis Group
关键词: Algae;distribution;freshwater;micro‐niches;substratum
数据来源: Taylor
摘要:
The immediate environment of benthic algae is reconsidered in terms of the substratum and the effect this can have on algal distribution, with particular reference to two freshwater ecosystems. Individual species often exhibit marked preferences for particular substrata, such that their presence in the littoral zone of lake systems reflects the type of substratum at different sites, while in a stream system the dynamic interaction between sediment and current velocity determines the substratum distribution and hence, to a large extent, diatom occurrence. In addition to physical differences between sediments, due to grain size, surface features etc., variation in chemical properties also potentially increases the range of contrasting niches for algal colonisation. Thus, different associations can develop within a single water body when contrasting substrata are available, although modifications in methodology may be required to recognise the finer scale patterns. Furthermore, the existence of precise species‐substratum relationships must be taken into account when benthic communities are assessed, particularly in any monitoring or predictive context, e.g. assessment of water‐quality, palaeolimnology etc.
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