Plant community dynamics of lomas fog oasis of Central Peru after the extreme precipitation caused by the 1997-98 El Niño event
| Autor: | Edgar Sánchez Infantas, Vanessa Teixeira Roth, Carolina Tovar |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Atmospheric Science 010504 meteorology & atmospheric sciences plant community Rain Climate lcsh:Medicine plant Plant Science Oceanography 01 natural sciences Nicotiana paniculata Peru lcsh:Science biodiversity Climatology El Nino-Southern Oscillation seasonal variation Multidisciplinary Deserts Ecology Biodiversity Plants Terrestrial Environments fog Geography classification Seasons seashore El Nino Research Article Nicotiana Ecological Metrics Gamma diversity precipitation 010603 evolutionary biology environmental impact Article Ecosystems Meteorology vegetation Loasa urens Dominance (ecology) Relative species abundance Plant Communities Weather desert Ecosystem 0105 earth and related environmental sciences nonhuman species diversity Plant Ecology lcsh:R Ecology and Environmental Sciences El Ni単o-Southern Oscillation humidity Species diversity Biology and Life Sciences Plant community Species Diversity Marine and aquatic sciences La Niña community dynamics Earth Sciences Alpha diversity lcsh:Q Species richness season |
| Zdroj: | PLoS ONE PLoS ONE, Vol 13, Iss 1, p e0190572 (2018) CONCYTEC-Institucional Consejo Nacional de Ciencia Tecnología e Innovación Tecnológica instacron:CONCYTEC |
| ISSN: | 1932-6203 |
| Popis: | Despite El Nino events being one of the main forces shaping the coastal desert vegetation in South America, the impacts of the high precipitation typical of this rare but recurrent climatic event remain understudied. Here we monitored the plant community of a coastal lomas, a seasonal desert ecosystem, during 1998 and 2001 to analyse its changes during the 1997-98 El Nino and the following La Nina events. We measured species abundance and vegetation cover in 31 plots, and recorded climate variables in Lomas de Lachay, Peru. We found a significant positive correlation between precipitation and vegetation cover, density, alpha diversity (species diversity at the plot level), total richness and abundance of several key species but no correlation with gamma diversity (species diversity at the whole loma level). During the El Nino event, the seasonality, typical of the lomas ecosystem, disappeared, as evidenced by both the similarity of species composition and mean vegetation cover values between most sampling campaigns of 1998 and 1999. Moreover, total richness was lower during the El Nino event than during the humid season of 2000 and 2001 resulting from the dominance of only a few species, such as Nicotiana paniculata and Loasa urens. Temporal-spatial changes in the abundance of the dominant species caused the differences between alpha and gamma diversity, especially during 1999. Within that year, mean alpha diversity showed similar values whilst gamma diversity values were different. The reestablishment of the seasonality of most plant community characteristics and a clear difference between species composition of the humid and the dry season occurred two years after the El Nino event, suggesting a resilient community. This study provides one of the few quantifications of the Peruvian lomas' response to the 1997-98 El Nino event and the following La Nina, one of the most extreme climatic events in the last century. |
| Databáze: | OpenAIRE |
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