Effets du réseau routier sur la connectivité des frayères du grand brochet (Esox lucius) au lac Saint-Pierre (fleuve Saint-Laurent, Canada)

Pichon, Céline Le; Mingelbier, Marc; Legros, M.-C.; Foubert, A.; Brodeur, Philippe

doi:10.7202/1042016ar

Cited by 4 publications

(1 citation statement)

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“…For example, in Maryland (USA), Weber & Allen (2010) defined a conservation network of high‐quality habitats as including ‘core streams’ that provide suitable habitat for fish, mussels and benthic macroinvertebrates. Functional connectivity modelling identified high‐potential northern pike ( Esox lucius ) habitats and connectivity corridors with high return frequency as priority areas for conservation by regional agencies (Le Pichon et al ., 2018). Restoring functional connectivity mainly involves ( i ) prioritizing barrier removal or improvement to increase fish migration (see review in McKay et al ., 2017) and ( ii ) restoring a network of core habitats and corridors (Wheaton et al ., 2019).…”

Section: Applications In Research and Managementmentioning

confidence: 99%

Riverscape approaches in practice: perspectives and applications

et al. 2021

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Landscape perspectives in riverine ecology have been undertaken increasingly in the last 30 years, leading aquatic ecologists to develop a diverse set of approaches for conceptualizing, mapping and understanding ‘riverscapes’. Spatiotemporally explicit perspectives of rivers and their biota nested within the socio‐ecological landscape now provide guiding principles and approaches in inland fisheries and watershed management. During the last two decades, scientific literature on riverscapes has increased rapidly, indicating that the term and associated approaches are serving an important purpose in freshwater science and management. We trace the origins and theoretical foundations of riverscape perspectives and approaches and examine trends in the published literature to assess the state of the science and demonstrate how they are being applied to address recent challenges in the management of riverine ecosystems. We focus on approaches for studying and visualizing rivers and streams with remote sensing, modelling and sampling designs that enable pattern detection as seen from above (e.g. river channel, floodplain, and riparian areas) but also into the water itself (e.g. aquatic organisms and the aqueous environment). Key concepts from landscape ecology that are central to riverscape approaches are heterogeneity, scale (resolution, extent and scope) and connectivity (structural and functional), which underpin spatial and temporal aspects of study design, data collection and analysis. Mapping of physical and biological characteristics of rivers and floodplains with high‐resolution, spatially intensive techniques improves understanding of the causes and ecological consequences of spatial patterns at multiple scales. This information is crucial for managing river ecosystems, especially for the successful implementation of conservation, restoration and monitoring programs. Recent advances in remote sensing, field‐sampling approaches and geospatial technology are making it increasingly feasible to collect high‐resolution data over larger scales in space and time. We highlight challenges and opportunities and discuss future avenues of research with emerging tools that can potentially help to overcome obstacles to collecting, analysing and displaying these data. This synthesis is intended to help researchers and resource managers understand and apply these concepts and approaches to address real‐world problems in freshwater management.

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Section: Applications In Research and Managementmentioning

confidence: 99%

Riverscape approaches in practice: perspectives and applications

et al. 2021

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How intensive agricultural practices and flow regulation are threatening fish spawning habitats and their connectivity in the St. Lawrence River floodplain, Canada

et al. 2020

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Hydrological and land use changes for human needs, have resulted in the increased fragmentation of river landscapes and the loss of aquatic habitats, leading to profound changes in fish diversity and productivity. ObjectivesIn the fluvial Lake Saint-Pierre (St. Lawrence River, Canada), we studied how riparian agriculture and water flow regulation have impacted the effectiveness of spawning habitats of northern pike (Esox lucius). MethodsNorthern pike spawning and nursery habitats were modelled over a 49-years period to estimate effective spawning areas under four contrasted hydrological conditions. ResultsThese simulations, coupled with land-use analyses, revealed that natural flow conditions usually favourable to fish reproduction have been lost due to human activities. The highest potential for reproduction, usually associated with high and stable water flows, has been lost due to (1) intensive agriculture in the upper floodplain Powered by Editorial Manager® and ProduXion Manager® from Aries Systems Corporationthat overlaps with suitable habitats for fish, and (2) flow regulation that leads to more frequent drying of spawning grounds. These profound anthropogenic changes have resulted in a significant loss of reproductive potential for northern pike and other fish species that use the floodplain to complete their life cycle. ConclusionsThis study suggests the need to convert intensive agriculture into natural wetlands or perennial crops and to restore a more natural flow regime by extending the duration of floods between spawning and nursery periods. The highest priority areas for restoration are the most effective and recurrent spawning habitats, ditch and stream networks, and connected managed wetlands.

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