Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/29182
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Lake and catchment-scale determinants of aquatic vegetation across almost 1,000 lakes and the contrasts between lake types
Author(s): Sun, Junyao
Hunter, Peter D
Tyler, Andrew N
Willby, Nigel J
Contact Email: n.j.willby@stir.ac.uk
Keywords: Connectivity
dispersal
hydrology
scale-dependent
metacommunity
nestedness
turnover
variation partitioning
Issue Date: May-2019
Citation: Sun J, Hunter PD, Tyler AN & Willby NJ (2019) Lake and catchment-scale determinants of aquatic vegetation across almost 1,000 lakes and the contrasts between lake types. Journal of Biogeography, 46 (5), pp. 1066-1082. https://doi.org/10.1111/jbi.13557
Abstract: Aim The factors controlling macrophyte (aquatic plant) composition are complex, recent research having shown that the well-studied effects of lake environmental factors (the so-called “environmental filter”) can be constrained by hydrological and landscape factors. We investigated the factors determining macrophyte composition in lakes over water body and catchment- scales and the transferability of this pattern across lake types. Location Almost 1000 lakes distributed across Britain. Taxon Lake macrophytes Methods Lakes were partitioned into five types based on subdivision of alkalinity and elevation gradients. Data from botanical surveys were used to compare the spatial turnover and nestedness components of beta diversity between lake types. The relative importance of lake environment (based on local physicochemical data), hydrology (e.g. lake and stream density), landscape (e.g. fragmentation indices, land cover) and spatial autocorrelation in explaining variation in macrophyte composition were derived from variance partitioning. Results Species composition showed strong spatial structuring, suggestive of overland dispersal, enhanced by spatially-correlated abiotic factors such as alkalinity and elevation. Catchment-scale factors (e.g. land use, connectivity) promoted the establishment of different communities (more or less diverse, or differing in composition) but were of secondary importance. Turnover in composition between upland lakes was lower than in other lake types, reflecting a more specialist flora and increased potential for propagule exchange due to spatial aggregation and higher hydrological connectivity. Main conclusions Vegetation composition in lakes is more spatially-structured than previously appreciated, consistent with the importance of dispersal limitation, but this does not apply evenly to all lakes, being most acute in lowland high alkalinity lakes. Thus, spatially-structured abiotic factors, such as alkalinity, influence macrophyte composition most (suggestive of niche filtering) in high alkalinity lakes where human impacts tend to be greatest, although nestedness was also lowest in such lakes. By contrast, hydrological connectivity has a proportionally stronger structuring role in upland lakes.
DOI Link: 10.1111/jbi.13557
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. This is the peer reviewed version of the following article: Sun, J, Hunter, PD, Tyler, AN, Willby, NJ. Lake and catchment‐scale determinants of aquatic vegetation across almost 1,000 lakes and the contrasts between lake types. Journal of Biogeography 2019; 46: 1066– 1082, which has been published in final form at https://doi.org/10.1111/jbi.13557. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for self-archiving.

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