title: The number of limiting resources in the environment controls the temporal diversity patterns in the algal benthos.
abstract: The role of the number of limiting resources (NLR) on species richness has been the subject of much theoretical and experimental work. However, how the NLR controls temporal beta diversity and the processes of community assembly is not well understood. To address this knowledge gap, we initiated a series of laboratory microcosm experiments, exposing periphyton communities to a gradient of NLR from 0 to 3, generated by supplementation with nitrogen, phosphorus, iron, and all their combinations. We hypothesized that similarly to alpha diversity, shown to decrease with the NLR in benthic algae, temporal beta diversity would also decline due to filtering. Additionally, we predicted that the NLR would also affect turnover and community nestedness, which would show opposing responses. Indeed, as the NLR increased, temporal beta diversity decreased; turnover, indicative of competition, decreased; and nestedness, suggestive of complementarity, increased. Finally, the NLR determined the role of deterministic versus stochastic processes in community assembly, showing respectively an increasing and a decreasing trend. These results imply that the NLR has a much greater, yet still unappreciated influence on producer communities, constraining not only alpha diversity but also temporal dynamics and community assembly.
authors.affiliation: Washington State Department of Ecology, Environmental Assessment Program, 300 Desmond Drive SE, Lacey, WA, 98503, USA. chad.larson@ecy.wa.gov.
authors.forename: Chad A
authors.initials: CA
authors.lastname: Larson
authors.affiliation: Biology Department, The University of Texas at Arlington, Box 19498, Arlington, TX, 76019-0498, USA.
authors.forename: Larry
authors.initials: L
authors.lastname: Adumatioge
authors.affiliation: Biology Department, The University of Texas at Arlington, Box 19498, Arlington, TX, 76019-0498, USA. sophia.passy@uta.edu.
authors.forename: Sophia I
authors.initials: SI
authors.lastname: Passy
mesh_terms: D044822:Biodiversity; D018441:Biofilms; D005068:Eutrophication; D005618:Fresh Water / Q000382:microbiology; D007501:Iron / Q000032:analysis; D016014:Linear Models; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D013997:Time Factors
chemical_list: D010758:Phosphorus; D007501:Iron; D009584:Nitrogen
keywords: Algae; Deterministic versus stochastic assembly; Nestedness; Number of limiting resources; Species turnover; Temporal beta diversity