||Contrasting changes in taxonomic, phylogenetic and functional diversity during a long-term succession: insights into assembly processes
||Purschke, O.; Schmid, B.C.; Sykes, M.T.; Poschlod, P.; Michalski, S.G.; Durka, W.
; Kühn, I.
; Winter, M.; Prentice, H.C.
|Journal / Serie
||Journal of Ecology
||alpha diversity; arable-to-grassland succession; beta diversity; chronosequence; community assembly; determinants of plant community diversity and structure; environmental filtering; null model; semi-natural grasslands; trait
predicts that the processes generating biodiversity after disturbance
will change during succession. Comparisons of phylogenetic and
functional (alpha and beta) diversity with taxonomic diversity can
provide insights into the extent to which community assembly is driven
by deterministic or stochastic processes, but comparative approaches
have yet to be applied to successional systems.
- We characterized
taxonomic, phylogenetic and functional plant (alpha and beta) diversity
within and between four successional stages in a > 270-year-long
arable-to-grassland chronosequence. Null models were used to test
whether functional and phylogenetic turnover differed from random
expectations, given the levels of species diversity.
- The three
facets of diversity showed different patterns of change during
succession. Between early and early-mid succession, species richness
increased but there was no increase in functional or phylogenetic
diversity. Higher than predicted levels of functional similarity between
species within the early and early-mid successional stages, indicate
that abiotic filters have selected for sets of functionally similar
species within sites. Between late-mid and late succession, there was no
further increase in species richness, but a significant increase in
functional alpha diversity, suggesting that functionally redundant
species were replaced by functionally more dissimilar species.
Functional turnover between stages was higher than predicted, and higher
than within-stage turnover, indicating that different assembly
processes act at different successional stages.
Analysis of spatial and temporal turnover in different facets of
diversity suggests that deterministic processes generate biodiversity
during post-disturbance ecosystem development and that the relative
importance of assembly processes has changed over time. Trait-mediated
abiotic filtering appears to play an important role in community
assembly during the early and early-mid stages of arable-to-grassland
succession, whereas the relative importance of competitive exclusion
appears to have increased towards the later successional stages.
Phylogenetic diversity provided a poor reflection of functional
diversity and did not contribute to inferences about underlying assembly
processes. Functionally deterministic assembly suggests that it may be
possible to predict future post-disturbance changes in biodiversity, and
associated ecosystem attributes, on the basis of species’ functional
traits but not phylogeny.
|Purschke, O., Schmid, B.C., Sykes, M.T., Poschlod, P., Michalski, S.G., Durka, W., Kühn, I., Winter, M., Prentice, H.C. (2013):
Contrasting changes in taxonomic, phylogenetic and functional diversity during a long-term succession: insights into assembly processes
J. Ecol. 101 (4), 857 - 866