التفاصيل البيبلوغرافية
| العنوان: |
Community assembly in harsh environments: the prevalence of ecological drift in the heath vegetation of South America |
| المؤلفون: |
Silva, J. L. A., Souza, A. F., Jardim, J. G., Goto, B. T. |
| المصدر: |
Ecosphere ; volume 6, issue 7, page 1-18 ; ISSN 2150-8925 2150-8925 |
| بيانات النشر: |
Wiley |
| سنة النشر: |
2015 |
| المجموعة: |
Wiley Online Library (Open Access Articles via Crossref) |
| الوصف: |
Metacommunity dynamics is marked by a gradient ranging from pure ecological determinism to pure stochasticity. This gradient encompasses compositional turnover that is governed by ecological drift, selection and dispersal. Here we estimate the influences of selection, dispersal limitation acting in concert with drift, drift acting alone and homogenizing dispersal on the structure of tropical restinga heath vegetation growing under stressful conditions in north‐eastern South America. We hypothesize that if abiotic heterogeneity is strong enough, it could select distinct sets of colonizing species from neighbor ecosystems, with stress sensitive species occupying refuges created by abiotic heterogeneity and stress tolerators dominating the more exposed areas. In this case selection would occur at both biogeographical and local scales. Under its prevalence, we expect selection to have a major signature in the woody plant community structure in a phylogenetic null model. Alternatively, if abiotic heterogeneity is not strong enough to impose significant selection, the environment would be homogeneously stressful for the majority of species, and would be dominated species selected at biogeographical scale only. Under its prevalence, we expect drift to have a major signature in the phylogenetic null model. We used an analytical framework based on phylogenetic and community structure null models to assess the relative importance of ecological processes. We also aimed to characterize the ecosystem features that impose selection and dispersal limitation. We found that 95.1% of turnover in composition is attributable to drift, 2.4% to homogenizing dispersal, 2.1% to selection, and just 0.40% to dispersal limitation, thus confirming our Neutrality hypothesis. As expected, both soil and topographic variables influenced metacommunity structure. However, contrary to our prediction, light availability and vegetation structure were also important. The predominance of coarse spatial patterns correlated to topographic and soil ... |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
English |
| DOI: |
10.1890/es14-00548.1 |
| DOI: |
10.1890/ES14-00548.1 |
| الإتاحة: |
https://doi.org/10.1890/es14-00548.1Test |
| حقوق: |
http://creativecommons.org/licenses/by/3.0Test/ |
| رقم الانضمام: |
edsbas.843F3D74 |
| قاعدة البيانات: |
BASE |
