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Diversity peaks at intermediate productivity in a laboratory microcosm.

Abstract：

:The species diversity of natural communities is often strongly related to their productivity. The pattern of this relationship seems to vary: diversity is known to increase monotonically with productivity, to decrease monotonically with productivity, and to be unimodally related to productivity, with maximum diversity occurring at intermediate levels of productivity. The mechanism underlying these patterns remains obscure, although many possibilities have been suggested. Here we outline a simple mechanism--involving selection in a heterogeneous environment--to explain these patterns, and test it using laboratory cultures of the bacterium Pseudomonas fluorescens. We grew diverse cultures over a wide range of nutrient concentrations, and found a strongly unimodal relationship between diversity and productivity in heterogeneous, but not in homogeneous, environments. Our result provides experimental evidence that the unimodal relationship often observed in natural communities can be caused by selection for specialized types in a heterogeneous environment.

journal_name

Nature

journal_title

Nature

authors

Kassen R,Buckling A,Bell G,Rainey PB

doi

10.1038/35020060

keywords:

subject

Has Abstract

pub_date

2000-08-03 00:00:00

pages

508-12

issue

6795

eissn

0028-0836

issn

1476-4687

journal_volume

406

pub_type

杂志文章

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