Research Document - 2008/005
Recovery Potential Modelling of Redside Dace (Clinostomus elongatus) in Canada
By L.A. Vélez-Espino and M.A. Koops
Abstract
In 2007, the Committee on the Status of Endangered Wildlife in Canada (COSEWIC) assessed the Redside Dace (Clinostomus elongatus) as Endangered in Canada. Here we assess allowable harm, determine a population-based recovery target, and conduct long-term projections of population recovery in support of a Recovery Potential Assessment (RPA). Our analyses demonstrated that Redside Dace population dynamics are particularly sensitive to perturbations on juvenile survival and that levels of human-induced harm should remain minimal to avoid jeopardizing the survival and future recovery of Canadian populations. Based on a demographic sustainability objective (i.e., the population is self-sustaining over the long term), we propose abundance recovery targets of 4 711 adult fish, which will require a minimum of 17 308 m² of suitable, exclusive habitat per population. Recovery strategies such as habitat rehabilitation and/or enhancement should target for at least a 20% increase in survival rates to produce desirable recovery timeframes shorter than 40 years.
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