Comparing the performance of species distribution models of Zostera marina: Implications for conservation

• Published in: Journal of sea research Vol. 83; pp. 56 - 64
• Main Authors: Valle, Mireia, van Katwijk, Marieke M., de Jong, Dick J., Bouma, Tjeerd J., Schipper, Aafke M., Chust, Guillem, Benito, Blas M., Garmendia, Joxe M., Borja, Ángel
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier B.V 01-10-2013; Elsevier
• Subjects: Accounting; Animal and plant ecology; Animal, plant and microbial ecology; Applied ecology; biogeography; Biological and medical sciences; Brackish; Conservation; conservation areas; Conservation, protection and management of environment and wildlife; Dynamics; Ecosystem Management; environmental factors; Estuaries; Fundamental and applied biological sciences. Psychology; General aspects; Habitats; Intertidal; Marinas; Marine; Monitoring; population dynamics; prediction; Sea water ecosystems; Seagrasses; Spatial distribution; Synecology; time series analysis; Wadden Sea; Wildlife conservation; Zostera marina; Netherlands; ANE, Europe, Ems-Dollart Estuary; TPA; Ecosystem Management; CPA; Dynamics; Conservation; SDM; Intertidal; Seagrasses; Wadden Sea; Monocotyledones; Potamogetonaceae; Environmental management; Marine environment; Zostera marina; Intertidal zone; Spatial distribution; Geographic distribution; Angiospermae; Spermatophyta; Models; Sea grass; Performance; Distribution range
• ISSN: 1385-1101; 1873-1414
• DOI: 10.1016/j.seares.2013.03.002

Intertidal seagrasses show high variability in their extent and location, with local extinctions and (re-)colonizations being inherent in their population dynamics. Suitable habitats are identified usually using Species Distribution Models (SDM), based upon the overall distribution of the species; thus, accounting solely for spatial variability. To include temporal effects caused by large interannual variability, we constructed SDMs for different combinations and fusions of yearly distribution data. The main objectives were to: (i) assess the spatio-temporal dynamics of an intertidal seagrass bed of Zostera marina; (ii) select the most accurate SDM techniques to model different temporal distribution data subsets of the species; (iii) assess the relative importance of the environmental variables for each data subset; and (iv) evaluate the accuracy of the models to predict species conservation areas, addressing implications for management. To address these objectives, a time series of 14-year distribution data of Zostera marina in the Ems estuary (The Netherlands) was used to build different data subsets: (1) total presence area; (2) a conservative estimate of the total presence area, defined as the area which had been occupied during at least 4years; (3) core area, defined as the area which had been occupied during at least 2/3 of the total period; and (4–6) three random selections of monitoring years. On average, colonized and disappeared areas of the species in the Ems estuary showed remarkably similar transition probabilities of 12.7% and 12.9%, respectively. SDMs based upon machine-learning methods (Boosted Regression Trees and Random Forest) outperformed regression-based methods. Current velocity and wave exposure were the most important variables predicting the species presence for widely distributed data. Depth and sea floor slope were relevant to predict conservative presence area and core area. It is concluded that, the fusion of the spatial distribution data from four monitoring years could be enough to establish an accurate habitat suitability model of Zostera marina in the Ems estuary. The methodology presented offers a promising tool for selecting realistic conservation areas for those species that show high population dynamics, such as many estuarine and coastal species.
•Intertidal seagrass beds were found to be highly dynamic populations.•New approach on species distribution modelling incorporating temporal variability•Promising tool for selecting conservation areas for estuarine dynamic populations