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European blue and green infrastructure network strategy vs. the common agricultural policy. Insights from an integrated case study (Couesnon, Brittany)

Abstract: Urbanization and agricultural intensification are the main drivers of biodiversity losses through multiple stressors, especially habitat fragmentation, isolation and loss. Designing Blue and Green Infrastructure Networks (BGIN) has been recommended as a potential tool for land-use planning to increase ecosystem services while preserving biodiversity. All municipalities in France are required to perform BGIN planning. This article focuses on the Couesnon watershed (Brittany, France) and the participatory process used to define and analyze five possible pathways of future land-use and land-cover changes that included implementation of BGINs. Impacts on biodiversity were estimated by quantifying the change in landscape connectivity of woodlands, grasslands and wetlands. The effectiveness of BGIN policies was assessed by comparing current landscape connectivity (2018) to those in possible futures. Landscape connectivity referred to functional connectivity for three indicator species (Abax parallelepipedus, Maniola jurtina and Arvicola sapidus) across three landscape features: woodlands, grasslands and wetlands, respectively. Results allowed impacts of urban and agricultural land-use changes to be identified in terms of extent and quality. If BGIN policies were applied effectively to control the expansion of gray infrastructure, they would help increase the area and the quality of grassland and woodland connectivity by no more than 2%. Agricultural land-use and land-cover changes could have more impact on the extent of grassland (?82% to +38%) and wetland (?49% to +47%) connectivity. Current and future trends for hedgerows implied a decrease in woodland connectivity of 9.8?33.8%. Impacts on the quality of landscape connectivity is not proportional with the extent, as a decrease of the latter can have relatively more negative impacts on the former, and inversely. The study highlights that the BGIN strategy can preserve landscape connectivity effectively in urban ecosystems, where human density is higher, but can be threatened by agricultural intensification.

 Fuente: Land Use Policy 2022,120,106277

 Editorial: Elsevier

 Fecha de publicación: 01/09/2022

 Nº de páginas: 13

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.landusepol.2022.106277

 ISSN: 0264-8377,1873-5754

 Url de la publicación: https://doi.org/10.1016/j.landusepol.2022.106277

Autoría

HOUET ,THOMAS

GAETAN, PALKA

ROBERTA, RIGO

HUGUES, BOUSSARD

BAUDRY, JACQUES

XAVIER, POUX

JEAN-BAPTISTE, NARCY

JOSE MANUEL ALVAREZ MARTINEZ

STEFANO, BALBI

CENDRINE, MONY

LUCIE, LECOQ

BEGANTON, JOHANNA