A latitudinal gradient in tree community assembly processes evidenced in Chinese forests. Issue 3 (8th January 2015)

• Record Type: Journal Article
• Authors: Qiao, Xiujuan; Jabot, Franck; Tang, Zhiyao; Jiang, Mingxi; Fang, Jingyun
• Is Part Of: Global ecology & biogeography. Volume 24:Issue 3(2015:Mar.)
• Page Start: 314
• Page End: 323
• Publication Date: 2015-01-08
• Subjects: Ecology -- Periodicals; Biogeography -- Periodicals; Biodiversity -- Periodicals; Macroevolution -- Periodicals; 577
• DOI: 10.1111/geb.12278
• Languages: English
• ISSNs: 1466-822X

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <sec id="geb12278-sec-0001" sec-type="section"> <title>Aim</title> <p>Most studies on latitudinal gradients of biodiversity have focused on gradients of species richness. Here we aim to test whether, on top of these strong diversity gradients, processes of community assembly vary along a latitudinal gradient of more than 33°.</p> </sec> <sec id="geb12278-sec-0002" sec-type="section"> <title>Location</title> <p>China, latitude 18.67–51.86° N.</p> </sec> <sec id="geb12278-sec-0003" sec-type="section"> <title>Methods</title> <p>We used species abundance distribution (SAD) data collected in 32 forest tree plots, and fitted a non‐neutral model of community assembly to these SADs. We then calculated the fitted deviation from neutrality, δ, and looked for correlations between δ and geographical and environmental data.</p> </sec> <sec id="geb12278-sec-0004" sec-type="section"> <title>Results</title> <p>The fitted parameter δ was positive in most plots, and was furthermore positively correlated with latitude and negatively with temperature, indicating a less even abundance distribution and a likely increase in the strength of environmental filtering in regions further from the tropics and with decreasing temperatures. These results imply that on top of reducing the species richness, cold temperature may impact community assembly processes by strengthening local environmental filtering.</p> </sec> <sec id="geb12278-sec-0005" sec-type="section"> <title>Main conclusions</title> <p>Our results suggest a latitudinal gradient in tree community assembly process in Chinese forests, in which deviations from neutrality increase with latitude, probably because of an increase in environmental harshness.</p> </sec> </abstract>