Tidal Marshes in the Saco River Estuary, Maine: A Study of Plant Diversity and Possible Effects of Shoreline Development

Morgan, Pamela A.; Adams, Mark D. O.

doi:10.3119/16-19

Cited by 3 publications

(1 citation statement)

References 30 publications

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“…Both salt and drought stress alter the ability of plants to utilize nutrients (Bista et al, 2018;Hu & Schmidhalter, 2005). Nitrogen is a main limiting factor for salt marsh vegetation (Kiehl, Esselink, & Bakker, 1997;van Wijnen & Bakker, 1999) and in agreement with results by Morgan and Adams (2018), total species richness in our study was limited by the availability of nitrogen. Our results also showed that N availability has less influence on total species richness during dry and more saline conditions, which could be explained by the results of Ryan and Boyer (2012) who found that overall species richness decreases while the dominance of a few salt marsh species increases when salinity and nitrogen levels increase simultaneously.…”

Section: Correlations Between the Edaphic Factors And Species Richnsupporting

confidence: 91%

Turnover and change in plant species composition in a shielded salt marsh following variation in precipitation and temperature

Andersen

Skærbæk

Sørensen

et al. 2020

J Vegetation Science

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Questions: Temperature and precipitation variation between years may affect plant species composition directly or indirectly. We wish to investigate whether salt marsh edaphic conditions and plant species composition change as a result of climatic variation. Further, whether areas with the largest edaphic variations also experience the largest change in species composition and turnover. Finally, do temperature and precipitation variations change the way the plant community is able to respond to natural edaphic gradients? Location: Bygholmengen, a shielded salt marsh in Vejlerne, Denmark, Northern Europe. Methods: Botanical surveys were conducted and soil samples collected from 40 plots during a wet and dry summer to register changes in vegetation cover, species richness composition and edaphic factors (moisture, nutrients, salinity). These data were used to calculate dissimilarities in species composition, temporal turnover and environmental dissimilarity between years. A linear mixed-effects model was used to link species richness with the measured edaphic factors.Results: We found that the precipitation and temperature variations altered the edaphic conditions; furthermore, the vegetation cover and species richness decreased when conditions were dry whereas the number of salt marsh species increased. Further, species composition changed significantly between years, and sampling plots that experienced the least edaphic change also retained more species between years. Species richness responded more to changes in nutrient availability during wet than dry conditions. Conclusion: Our results pointed toward the climatic variations, and subsequent change in edaphic conditions, being responsible for the significant change in species composition as areas with the least change in edaphic factors retained most species between years. Dry conditions favored salt marsh-adapted species and the extent to which increased nutrient levels led to a higher species richness decreased in dry compared to wet conditions. K E Y W O R D S biodiversity, coastal habitat, Denmark, environmental dissimilarity, salt meadow, species richness, temporal turnover, vegetation 466 | Additional supporting information may be found online in the Supporting Information section. Appendix S1. A map of the study site along with images of the area in 2017 and 2018 Appendix S2. List of salt marsh species How to cite this article: Andersen LH, Skaerbaek ASK, Sørensen TB, et al. Turnover and change in plant species composition in a shielded salt marsh following variation in precipitation and temperature. J Veg Sci. 2020;31:465-475.

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