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Nunes, Monique; Lemley, Daniel A.; Machite, Anesu; Adams, Janine B.
Marine pollution bulletin, September 2024, Volume: 206Journal Article
Mangrove habitats support taxonomically diverse benthic communities, yet their effects on microphytobenthos remain understudied. This study investigated the benthic diatom community structure of 17 microtidal mangrove estuaries situated along the east coast of South Africa. High sediment organic content (≤ 18.1 %) and clay fraction (≤ 17.5 %) measured in the Avicennia marina and Rhizophora mucronata habitats favoured diverse communities (H′ > 3) and the presence of unique benthic diatom species such as Gyrosigma balticum. The habitat complexity and stabilisation provided by the mangrove forests served as microrefugia for colonisation of benthic diatoms. Taxa displayed a broad range of nutrient tolerance, with some nutrient tolerant species (e.g., Halamphora acutiuscula, Navicula clausii, Navicula gregaria, and Navicula radiosa) dominating the communities in the Mbashe and Mnyameni estuaries. The presence of these nutrient tolerant taxa in relatively pristine systems serves as an early warning for possible anthropogenic nutrient enrichment. •Low-nutrient conditions supported a diverse benthic diatom community.•Benthic diatom diversity was higher (H′ >3) in the mangrove habitats.•The finer cohesive mangrove sediments favoured the proliferation of select taxa.•Lower diversity (H′ < 2) due to higher flow were unique to the control habitat.•Some nutrient tolerant taxa were recorded in select estuaries.
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