NDLI: Neutral processes and species sorting in benthic microalgal community assembly: effects of tidal resuspension.

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Neutral processes and species sorting in benthic microalgal community assembly: effects of tidal resuspension.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Plante, Craig J. Fleer, Virginia Jones, Martin L.
Description	Country affiliation: United States Author Affiliation: Plante CJ ( Grice Marine Laboratory, Biology Dept., College of Charleston, Charleston, South Carolina, 29412, USA.); Fleer V ( Coastal Sciences Dept., USM Gulf Coast Research Laboratory, Ocean Springs, Mississippi, 39564, USA.); Jones ML ( Mathematics Dept., College of Charleston, Charleston, South Carolina, 29424, USA.)
Abstract	Benthic microalgae (BMA) provide vital food resources for heterotrophs and stabilize sediments with their extracellular secretions. A central goal in ecology is to understand how processes such as species interactions and dispersal, contribute to observed patterns of species abundance and distribution. Our objectives were to assess the effects of sediment resuspension on microalgal community structure. We tested whether taxa-abundance distributions could be predicted using neutral community models (NCMs) and also specific hypotheses about passive migration: (i) As migration decreases in sediment patches, BMA -diversity will decrease, and (ii) As migration decreases, BMA community dissimilarity (ß-diversity) will increase. Co-occurrence indices (checkerboard score and variance ratio) were also computed to test for deterministic factors, such as competition and niche differentiation, in shaping communities. Two intertidal sites (mudflat and sand bar) differing in resuspension regime were sampled throughout the tidal cycle. Fluorometry and denaturing gradient gel electrophoresis were utilized to investigate diatom community structure. Observed taxa-abundances fit those predicted from NCMs reasonably well (R of 0.68-0.93), although comparisons of observed local communities to artificial randomly assembled communities rejected the null hypothesis that diatom communities were assembled solely by stochastic processes. No co-occurrence tests indicated a significant role for competitive exclusion or niche partitioning in microalgal community assembly. In general, predictions about relationships between migration and species diversity were supported for local community dynamics. BMA at low tide (lowest migration) exhibited reduced -diversity as compared to periods of immersion at both mudflat and sand bar sites. ß-diversity was higher during low tide emersion on the mudflat, but did not differ temporally at the sand bar site. In between-site metacommunity comparisons, low- and high-resuspension sites exhibited distinct community compositions while the low-energy mudflats contained higher microalgal biomass and greater -diversity. To our knowledge this is the first study to test the relevance of neutral processes in structuring marine microalgal communities. Our results demonstrate a prominent role for stochastic factors in structuring local BMA community assembly, although unidentified nonrandom processes also appear to play some role. High passive migration, in particular, appears to help maintain species diversity and structure communities in both sand and muddy habitats.
File Format	HTM / HTML
ISSN	00223646
Issue Number	5
Journal	Journal of Phycology
Volume Number	52
e-ISSN	15298817
Language	English
Publisher	Wiley
Publisher Date	2016-10-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Botany
Content Type	Text
Resource Type	Article
Subject	Plant Science Aquatic Science

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Key Bioturbator Species Within Benthic Communities Determine Sediment Resuspension Thresholds

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