A habitat-based framework to predict the effects of agricultural drain maintenance on imperiled fishes. (15th January 2018)

• Record Type: Journal Article
• Authors: Montgomery, F.A.; Reid, S.M.; Mandrak, N.E.
• Is Part Of: Journal of environmental management. Volume 206(2018)
• Page Start: 1104
• Page End: 1114
• Publication Date: 2018-01-15
• Subjects: Drain maintenance -- Habitat alteration -- Population viability analysis -- Habitat models -- Land management -- Imperiled species; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2017.11.087
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: One third of the total global land viable for agricultural production has artificial drainage systems. These drainage systems can provide important habitat for fishes and, in some cases, imperiled fish species vulnerable to impact by drainage maintenance activities. A framework to provide quantitative assessments of the effects of maintenance activities on imperiled fish species is needed. In this study, a six-step habitat-based framework was developed to predict suitable habitat for two at-risk species in an agricultural drain: the Endangered Pugnose Shiner ( Notropis anogenus) and the Special Concern Blackstripe Topminnow ( Fundulus notatus) . Using the framework, spatial models were developed to assess the effects of proposed drain maintenance on the overall amount of suitable habitat, habitat patch size, and connectivity of habitat patches. Maintenance had a significant impact on habitat connectivity, but did not significantly reduce the habitat size of isolated patches. The amount of suitable habitat available after maintenance fell below the minimum area for population viability (MAPV) for the Pugnose Shiner, but not the Blackstripe Topminnow. Future impact assessments of drain maintenance should incorporate population viability analysis, coupled with habitat patch analysis (patch size and connectivity), to quantitatively test consequences of proposed alteration to the viability of spatially structured populations. Highlights: Developed a framework to assess the effects of drain maintenance on imperiled fishes. The framework uses a six-step habitat-based modelling approach. Using patch analysis, changes in habitat quantity and connectivity were assessed. Population-level impacts were assessed by considering minimum area requirements.