NDLI: Patterns of Plant Species Richness Along Environmental Gradients in German North Sea Salt Marshes

Content Provider	Springer Nature Link
Author	Suchrow, Sigrid Stock, Martin Jensen, Kai
Copyright Year	2014
Abstract	In salt marshes, species richness changes along environmental, disturbance and productivity gradients forming a complex network of abiotic and biotic factors. On 2,691 plots along 121 transects, we sampled vegetation along the German mainland North Sea coast (13 regions) during 1987–1989. Applying regression tree analysis (RTA), we now used this large data set to analyse variance in species richness (SRich) in relation to 13 explanatory variables varying on different scales. SRich (mean, 4.9 per m$^{2}$) was significantly correlated to most variables. Only six variables were included in our final model, together explaining 68.5 % of variance in SRich, in hierarchical order: moisture, salinity, evenness, nitrogen, region and elevation. Predominantly, SRich was limited by environmental heterogeneity (moisture, salinity and nitrogen, each explained approx. 50 % variance). SRich tended to be high on plots exhibiting a combination of low moisture, salinity and nitrogen values, with high evenness—and especially high in some regions when plots were lying high in relation to mean high tide. Grazing regimes did not affect SRich significantly. In conclusion, our model showed that SRich in the study area was predominantly explained on a small scale and less along large-scale gradients. RTA proved suitable to identify the set of variables that mainly explained variance in SRich. Our tree model improves the understanding of richness patterns in salt marshes and can be used to predict species richness for the study area. Furthermore, our data provide a reference to detect richness changes due to, for example, management changes or sea level rise.
Starting Page	296
Ending Page	309
Page Count	14
File Format	PDF
ISSN	15592723
Journal	Estuaries
Volume Number	38
Issue Number	1
e-ISSN	15592731
Language	English
Publisher	Springer US
Publisher Date	2014-04-30
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ellenberg’s indicator values Grazing management HOF-modelling Regression tree analysis (RTA) Sea level rise (SLR) Species diversity Environment Ecology Freshwater & Marine Ecology Environmental Management Coastal Sciences Water and Health
Content Type	Text
Resource Type	Article
Subject	Ecology Aquatic Science Ecology, Evolution, Behavior and Systematics

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