Ecosystem recovery after climatic extremes enhanced by genotypic diversity.

Abstract:

:Contemporary climate change is characterized both by increasing mean temperature and increasing climate variability such as heat waves, storms, and floods. How populations and communities cope with such climatic extremes is a question central to contemporary ecology and biodiversity conservation. Previous work has shown that species diversity can affect ecosystem functioning and resilience. Here, we show that genotypic diversity can replace the role of species diversity in a species-poor coastal ecosystem, and it may buffer against extreme climatic events. In a manipulative field experiment, increasing the genotypic diversity of the cosmopolitan seagrass Zostera marina enhanced biomass production, plant density, and faunal abundance, despite near-lethal water temperatures due to extreme warming across Europe. Net biodiversity effects were explained by genotypic complementarity rather than by selection of particularly robust genotypes. Positive effects on invertebrate fauna suggest that genetic diversity has second-order effects reaching higher trophic levels. Our results highlight the importance of maintaining genetic as well as species diversity to enhance ecosystem resilience in a world of increasing uncertainty.

authors

Reusch TB,Ehlers A,Hämmerli A,Worm B

doi

10.1073/pnas.0500008102

keywords:

subject

Has Abstract

pub_date

2005-02-22 00:00:00

pages

2826-31

issue

8

eissn

0027-8424

issn

1091-6490

pii

0500008102

journal_volume

102

pub_type

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