A Spatially Explicit Resource-Based Approach for Managing Stream Fishes in Riverscapes |
| |
Authors: | Céline Le Pichon Guillaume Gorges Philippe Boët Jacques Baudry François Goreaud Thierry Faure |
| |
Institution: | (1) Aquatic Ecology, Cemagref–HBAN, 92163, Antony, France;(2) INRA SAD–Armorique , 35042, Rennes Cedex, France;(3) Cemagref–LISC, 63172, Aubière, France |
| |
Abstract: | The article describes a riverscape approach based on landscape ecology concepts, which aims at studying the multiscale relationships
between the spatial pattern of stream fish habitat patches and processes depending on fish movements. A review of the literature
shows that few operational methods are available to study this relationship due to multiple methodological and practical challenges
inherent to underwater environments. We illustrated the approach with literature data on a cyprinid species (Barbus barbus) and an actual riverscape of the Seine River, France. We represented the underwater environment of fishes for different discharges
using two-dimensional geographic information system-based maps of the resource habitat patches, defined according to activities
(feeding, resting, and spawning). To quantify spatial patterns at nested levels (resource habitat patch, daily activities
area, subpopulation area), we calculated their composition, configuration, complementation, and connectivity with multiple
spatial analysis methods: patch metrics, moving-window analysis, and least cost modeling. The proximity index allowed us to
evaluate habitat patches of relatively great value, depending on their spatial context, which contributes to the setting of
preservation policies. The methods presented to delimit potential daily activities areas and subpopulation areas showed the
potential gaps in the biological connectivity of the reach. These methods provided some space for action in restoration schemes. |
| |
Keywords: | Landscape ecology Stream fishes Barbus barbus Resource habitat mapping Fragmentation Complementation Spatial pattern analysis Restoration |
本文献已被 PubMed SpringerLink 等数据库收录! |
|