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Multiple Estuarine Gradients Influencing Tidal Flat Benthic Algal Biomass and Community Structure in the Yaquina Estuary, OR, USA

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Abstract

Tidal flat is often the dominant habitat type in US Pacific Northwest (PNW) estuaries. This research examined environmental factors that explain the spatial patterns of microphytobenthos (MPB) biomass and community structure in a PNW estuary with complex nutrient dynamics. MPB biomass, individual species abundances, diatom community metrics, and diatom community structure were strongly correlated with distance from the estuary mouth, salinity, substrate composition, and pore water-soluble reactive phosphorus (SRP). The microphytobenthos was dominated by diatoms and diatom diversity and species richness were negatively associated with salinity, substrate sand content, and pore water SRP. Diatom community structure varied with estuary position, with the epipsammic taxa Catenula adhaerens, Opephora spp. 1, and Planothidium delicatulum dominating the assemblage at sites near the estuary mouth and epipelic taxa, such as Nitzschia frustulum and Nitzschia palea, being more abundant at sites in the middle and upper estuary. Distance from the estuary mouth and salinity were the most important predictors of diatom assemblage structure, based on CCA analysis. MPB biomass was highest at sites in the lower estuary, characterized by higher salinities, SRP, and substrate sand composition. Pore water nitrogen and surrounding land use were not important predictors of MPB biomass or community structure. We attribute our findings to the nutrient dynamics of Yaquina estuary, which is high in nutrients due to both coastal upwelling and watershed-derived nitrate and exhibits an increasing gradient of phosphorus towards the estuary mouth.

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Funding

This research was funded in part by a grant from the M. J. Murdock Charitable Trust.

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Authors and Affiliations

  1. Department of Biology, University of Portland, 5000 N. Willamette Blvd., Portland, OR, 97203, USA

    Christine L. Weilhoefer, Cristiana N. Matteucci & Frances Turner

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  1. Christine L. Weilhoefer
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  2. Cristiana N. Matteucci
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  3. Frances Turner
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Correspondence to Christine L. Weilhoefer.

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Communicated by Just Cebrian

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Weilhoefer, C.L., Matteucci, C.N. & Turner, F. Multiple Estuarine Gradients Influencing Tidal Flat Benthic Algal Biomass and Community Structure in the Yaquina Estuary, OR, USA. Estuaries and Coasts 44, 1392–1407 (2021). https://doi.org/10.1007/s12237-020-00854-6

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