Abstract
Fish habitat loss has been prevalent over the last century in Canada. To prevent further erosion of the resource base and ensure sustainable development, Fisheries and Oceans Canada enacted the habitat provisions of the Fisheries Act in 1976. In 1986, this was articulated by a policy that a “harmful alteration, disruption, or destruction to fish habitat” (HADD) cannot occur unless authorised with legally binding compensatory habitat to offset the HADD. Despite Canada’s progressive conservation policies, the effectiveness of compensation habitat in replicating ecosystem function has never been tested on a national scale. The effectiveness of habitat compensation projects in achieving no net loss of habitat productivity (NNL) was evaluated at 16 sites across Canada. Periphyton biomass, invertebrate density, fish biomass, and riparian vegetation density were used as indicators of habitat productivity. Approximately 63% of projects resulted in net losses in habitat productivity. These projects were characterised by mean compensation ratios (area gain:area loss) of 0.7:1. Twenty-five percent of projects achieved NNL and 12% of projects achieved a net gain in habitat productivity. These projects were characterised by mean ratios of 1.1:1 and 4.8:1, respectively. We demonstrated that artificially increasing ratios to 2:1 was not sufficient to achieve NNL for all projects. The ability to replicate ecosystem function is clearly limited. Improvements in both compensation science and institutional approaches are recommended to achieve Canada’s conservation goal.
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Acknowledgments
The authors would like to thank the staff in DFO Regional and Area offices for their support and access to files. Technical assistance and field support were provided by James Wilkinson. Earlier versions of this article were greatly improved from reviews by Scott Hinch, Otto Langer, Ryan Galbraith, and three anonymous reviewers. Special thanks are also due to Marcia Vanwely and Louise Archibald of the DFO Pacific Region library for their continued support and excellent service. Funding for this initiative was provided by the Environmental Science Strategic Research Fund.
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Quigley, J.T., Harper, D.J. Effectiveness of Fish Habitat Compensation in Canada in Achieving No Net Loss. Environmental Management 37, 351–366 (2006). https://doi.org/10.1007/s00267-004-0263-y
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DOI: https://doi.org/10.1007/s00267-004-0263-y