Incorporating environmetntal uncertainty into species management decisions: Kirtland's Warbler habitat management as a case study

Article Abstract:

Environmental uncertainty can be incorporated into species management decisions, as it has been in decisions related to the Kirtland's Warbler (Dendroica kintlandii) habitat. There is riskiness inherent in strategies for species management. A framework that identifies two critical parameters in the management objective has been developed. The parameters are the population level that would be desirable and the minimum acceptable probability of getting to that objective with a given management strategy, that is, the safety margin. For the Kirtland's Warbler a stochastic simulation model was used to generate probability distributions for populations outcomes for different management strategies. Rotation length of commercial logging was varied. Cost of each rotation length was found as the opportunity cost of nonoperation at the profit-maximizing rotation length. Cost and warbler population distribution were used to find cost curves for the two critical decision parameters. For most of the values in the range studied, relationships between cost and population objective and safety margin, both, are linear. The cost increase rate goes up as the population objective goes up as the safety margin for the objective is increased.

Methods, Usage, Economic aspects, Measurement, Stochastic analysis, Biology, Environmental policy research, Environmental monitoring, Species, Species (Biology), Uncertainty (Information theory)

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Effects of forest fragmentation on breeding tanagers: a continental perspective

Article Abstract:

Forest fragmentation has had an effect on breeding tanagers, as can be seen from a study of effects of habitat fragmentation on four species and 1107 sites. Three habitat gradients affected occurrence. Response to habitat gradients varied significantly among four regions in the range of Scarlet Tanagers. In very fragmented sites probability of finding breeding tanagers was lowest. Effects on cowbirds and predators usually were opposite those of breeding tanagers. Conserving forest bird populations and reversing declines will require knowledge of habitat requirements across the whole ranges of widespread species and knowledge of how demographic and landscape factors interact to create population sources and sinks.

North America, Research, Human beings, Human-environment interactions, Biological diversity conservation, Biodiversity conservation, Forest fauna, Forest animals, Forest declines, Forest dieback

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Prescribed burning to restore mixed-oak communities in southern Ohio: Effects on breeding bird populations

Article Abstract:

Fire was reintroduced into the southern Ohio forests to study the effects it has on the restoring and maintaining of mixed-oak forest communities. The reports indicate that prescribed burning applied on a long-term basis or across large spatial scales is likely to have negative affects on ground-and low-shrub-nesting species, but other changes in the composition of the breeding-bird community are likely to be minimal as the closed-canopy forest structure is maintained within the context of prescribed burning.

Ohio, Influence, Bird breeding, Forest fires

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