A trait-based approach to unravel the effects of habitat connectivity and habitat amount on weeds - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Conference Papers Year : 2019

A trait-based approach to unravel the effects of habitat connectivity and habitat amount on weeds

Abstract

The recent essay of Fahrig (2019) has revived the debate about the relative influence of two major components of landscape structure, i.e. habitat connectivity and habitat amount, on biodiversity. In plants, these two components may act as a filter on dispersal and establishment trait values (response trait). These trait values should, in turn, shape plant diversity and abundance (effect trait). In agricultural landscapes, weeds play a dual role. They support important ecosystem functions (e.g. pollination, limitation of soil erosion) but also represent a major problem for farmers through the competition with the crop. Unraveling the effects of habitat connectivity and habitat amount on weed traits should then help to understand the mechanisms behind their maintenance and growth in fields. Here, we investigated the relative effects of habitat connectivity and habitat amount on i) five dispersal and establishment trait values and on ii) weed richness, diversity and cover, as proxies of their colonization ability. We sampled 27 cereal fields in the LSTER-ZA Armorique. We assessed habitat connectivity and habitat amount provided by wooded, grassland and cropland elements at three spatial scales: 250m, 500m and 750m. Habitat connectivity provided by cropland elements decreased aggregated values of seed germination rate. Habitat amount provided by wooded, grassland and cropland elements impacted aggregated values of plant height vegetative, seed mass, seed germination rate and seed number per plant. Changes in trait values of seed germination rate and seed mass, in turn, drove weed cover and diversity. Our results demonstrated hence that landscape structure shapes the colonization ability and establishment of weeds through its filtering effect on functional traits. This study emphasizes that using the response-effect trait framework provides a better understanding of weed assembly rules and a key to combine the maintenance of weeds without jeopardizing crop production.
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Origin : Files produced by the author(s)
Origin : Files produced by the author(s)

Dates and versions

hal-02738335 , version 1 (02-06-2020)

Identifiers

  • HAL Id : hal-02738335 , version 1
  • PRODINRA : 483655

Cite

Léa Uroy, Cendrine Mony, Aude Ernoult, Audrey Alignier. A trait-based approach to unravel the effects of habitat connectivity and habitat amount on weeds. 10. IALE World Congress 2019, International Association for Landscape Ecology (ALE). USA., Jul 2019, Milan, Italy. ⟨hal-02738335⟩
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