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Relationship of Sphaeroma quoianum to sediment characteristics and invertebrate community

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Abstract

Many important wetland functions are tied to sediment dynamics, which are influenced by infaunal invertebrate communities. These communities are sensitive to changes in sediment structure and to colonization by non-native species. In a southern California salt marsh, the non-native isopod Sphaeroma quoianum has created dense networks of burrows within the marsh banks. Since this isopod increases erosion in many areas and can change local invertebrate communities, its possible contribution to habitat loss in this already-scarce southern California ecosystem is an important issue. To determine the relationship of S. quoianum to invertebrate community and sediment characteristics, three burrowed transects and one unburrowed transect were surveyed and sampled for invertebrate and sediment cores. This study tested the association between burrows and grain size distribution, sediment carbon content, respiration rates, and invertebrate community composition. Sphaeroma quoianum burrows were correlated with altered invertebrate community composition, decreased carbon content, and steep marsh bluffs. These results highlight the potential susceptibility of salt marsh habitat with steep edges to invasion by non-native species. These results also suggest that S. quoianum invasion of salt marsh habitats can alter native communities and ecosystem functions; thus, incipient invasions should be of concern to managers and ecologists alike.

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Availability of data and material

Sediment parameters (carbon content, respiration rates) and invertebrate parameters (including species list) are available at https://doi.org/10.5281/zenodo.6954329.

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Acknowledgements

We wish to acknowledge the Tongva-Gabrieleno and Acjachemen people whose traditional homelands are the site of this research. We thank the Kirby Lab at California State University Fullerton, Valerie Goodwin, Janet Salazar, Molly Burdick-Whipp, Anita Arenas, and Lisa Mastro for field and lab support. Access to the study site was granted by California Fish and Wildlife as well as the State Lands Commission. We are grateful to the two anonymous reviewers whose suggestions greatly improved this manuscript. This publication was prepared with funding from Disney Resort Disney Worldwide Conservation Fund to the Bolsa Chica Conservancy and CSULB. Funding was provided to Brown by The Society of Wetland Scientists, Bolsa Chica Conservancy, and the Southern California Tuna Club.

Funding

Society of Wetland Scientists Graduate Student Award to MB, Bolsa Chica Conservancy (BCC) to CRW and MB, Disney Corporation to BCC, Southern California Tuna Club Graduate Research Award to MB, CSULB Small Faculty Grant to CRW.

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MB was responsible for project conceptualization, data collection and curation, formal analysis, funding acquisition, investigation, development of methodology, writing the original draft, and revising the subsequent drafts. JK was responsible for project conceptualization, supervision of data collection and curation, assistance with formal analysis, development of methodology, writing the original draft, and subsequent drafts. CRW was responsible for project conceptualization, supervision of data collection and curation, assistance with formal analysis, funding acquisition, investigation, development of methodology, project administration, supervision, writing the original draft, and subsequent drafts.

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Correspondence to Morgan E. Brown.

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This product was written in my personal capacity and not as a product of the Alaska Department of Environmental Conservation (ADEC) or the State of Alaska. My affiliation with the ADEC is in no way intended to imply that the ADEC sanctions or endorses my personal activities or my personal viewpoints expressed in this paper.

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Brown, M.E., Keller, J.K. & Whitcraft, C.R. Relationship of Sphaeroma quoianum to sediment characteristics and invertebrate community. Biol Invasions 24, 3631–3645 (2022). https://doi.org/10.1007/s10530-022-02867-7

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  • DOI: https://doi.org/10.1007/s10530-022-02867-7

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