TY  - GEN
A1  - Lozada Gobilard, Sissi Donna
A1  - Stang, Susanne
A1  - Pirhofer-Walzl, Karin
A1  - Kalettka, Thomas
A1  - Heinken, Thilo
A1  - Schröder, Boris
A1  - Eccard, Jana
A1  - Jasmin Radha, Jasmin
T1  - Environmental filtering predicts plant‐community trait  distribution and diversity
T2  - Postprints der Universität Potsdam Mathematisch-Naturwissenschaftliche Reihe
N2  - Meta‐communities of habitat islands may be essential to maintain biodiversity in anthropogenic landscapes allowing rescue effects in  local habitat patches. To understand the species‐assembly mechanisms  and dynamics of such ecosystems, it is important to  test how local plant‐community diversity and composition is affected by spatial isolation and hence by dispersal limitation and local environmental conditions acting as filters for local species sorting. We used a system of 46 small wetlands (kettle holes)—natural small‐scale freshwater habitats rarely considered in  nature conservation policies—embedded in an  intensively managed agricultural matrix in northern Germany. We compared two types of kettle holes with distinct topographies (flatsloped, ephemeral, frequently plowed kettle holes vs. steep‐sloped, more permanent ones) and determined 254 vascular plant species within these ecosystems, as well as plant functional traits and nearest neighbor distances to other kettle holes. Differences in alpha and beta diversity between steep permanent compared with ephemeral flat kettle holes were mainly explained by species sorting and niche processes and mass effect processes in ephemeral flat kettle holes. The plant‐community composition as well as the community trait distribution in terms of life span, breeding system, dispersal ability, and longevity of seed banks significantly differed between the two habitat types. Flat ephemeral kettle holes held a higher percentage of non‐perennial plants with a more persistent seed bank, less obligate outbreeders and more species with seed dispersal abilities via animal vectors compared with steep‐sloped, more permanent kettle holes that had a higher percentage of wind‐dispersed species. In the flat kettle holes, plant‐species richness was negatively correlated with the degree of isolation, whereas no such pattern was found for the permanent kettle holes. Synthesis: Environment acts as filter shaping plant diversity (alpha and beta) and plant‐community trait distribution between steep permanent compared with ephemeral flat kettle holes supporting species sorting and niche mechanisms as expected, but we identified a mass effect in ephemeral kettle holes only. Flat ephemeral kettle holes can be regarded as meta‐ecosystems that strongly depend on seed dispersal and recruitment from a seed bank, whereas neighboring permanent kettle holes have a more stable local species diversity.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 629 
KW  - biodiversity
KW  - dispersal
KW  - disturbance
KW  - landscape diversity
KW  - life‐history traits
KW  - plant diversity
KW  - seed bank
KW  - species assembly
KW  - wetland vegetation
Y1  - 2019
UR  - https://publishup.uni-potsdam.de/frontdoor/index/index/docId/42484
UR  - https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-424843
SN  - 1866-8372
IS  - 629
ER  -