Maximizing Endangered Species Research

Rosenberg, Daniel K.; Veselý, David; Gervais, Jennifer A.

doi:10.1126/science.337.6096.799-b

Cited by 4 publications

(4 citation statements)

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“…Recommendations to conduct experimental removal of barred owls have been criticized as being too difficult to accomplish because of the effort and cost required to maintain sufficiently low numbers of barred owls to benefit northern spotted owls (Livezey , Rosenberg et al ). Nonetheless, pilot studies in coastal California have demonstrated a positive association between removal of barred owls and population trends of northern spotted owls (Diller et al , Dugger et al ); Diller et al () reported that removal of barred owls can be rapid, technically feasible, and cost‐effective.…”

Section: Priorities For Research and Managementmentioning

confidence: 99%

“…In the Pacific Northwest, complete eradication of barred owls is unlikely because of their abundance and colonization and dispersal abilities (Rosenberg et al ; Yackulic et al , ). However, removal over large scales may affect regional occupancy rates and lead to reduced barred owl recolonization (Yackulic et al ).…”

Section: Priorities For Research and Managementmentioning

confidence: 99%

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Potential trophic cascades triggered by the barred owl range expansion

et al. 2016

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Recently, the barred owl (Strix varia) has expanded its range into the Pacific Northwest of the United States resulting in pronounced effects on the demography and behavior of the northern spotted owl (S. occidentalis caurina). The range expansion has brought together historically allopatric species, creating the potential for significant changes in the avian predator community with possible cascading effects on food-web dynamics. The adverse effects of the barred owl on the behavior and demography of the northern spotted owl are well-documented, but little is known about the immediate and long-term effects changes in the predator community may have on native species composition and ecosystem processes. Based on northern spotted owl and barred owl selection for diet and habitat resources, there is a potential for trophic cascades within the region's predator and prey communities, differing responses by their shared and unique prey species, and possible direct and indirect effects on ecosystem processes. We explored the possible ecological consequences of the barred owl range expansion to wildlife communities of the Pacific Northwest based on the theoretical underpinnings of predator-prey relationships, interspecific competition, intraguild predation, and potential cascading trophic interactions. Negative effects on fitness of northern spotted owls because of interspecific competition with barred owls are strong selection forces that may contribute to the regional extinction of the northern spotted owl. In addition, we posit that shared prey species and those uniquely consumed by barred owls, along with other competing native predators, may experience changes in behavior, abundance, and distribution as a result of increased rates of predation by rapidly expanding populations of barred owls.

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Section: Priorities For Research and Managementmentioning

confidence: 99%

Section: Priorities For Research and Managementmentioning

confidence: 99%

Potential trophic cascades triggered by the barred owl range expansion

et al. 2016

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“…Thus, removal experiments have been recommended in the northern spotted owl recovery plan (USFWS , ) because they provide a causal test of the relationship between declining trends in northern spotted owl populations and increasing trends of barred owls. Despite scientific support for such experiments (Romesburg ), they are controversial based on assertions that removal experiments would be costly, difficult to accomplish, and would require continuous maintenance to address re‐colonization of removal sites by barred owls (Livezey , Rosenberg et al ). These are reasonable concerns because efficacy of any potential removal experiment, and ultimately, a barred owl management strategy, must be feasible and not result in the death of unintended species (Caughley and Gunn ).…”

Section: Discussionmentioning

confidence: 99%

“…Fish and Wildlife Service to recognize the barred owl as a primary threat to the northern spotted owl, and recommend removal experiments to test the hypothesis that barred owls were causing the observed decline of northern spotted owl and to examine the feasibility of controlling barred owls (USFWS ). The recommendation to conduct experiments has been criticized by some as being, among other things, precedent‐setting, costly, ineffective, and distracting to scientists (Livezey , Rosenberg et al ). To address cost and feasibility concerns, we removed barred owls on a portion of Green Diamond Resource Company's (hereafter, Green Diamond) long‐term northern spotted owl demographic area where barred owls have been increasing and spotted owls have been decreasing in recent years.…”

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confidence: 99%

Removing barred owls from local areas: Techniques and feasibility

et al. 2013

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The barred owl (Strix varia) has invaded the range of the northern spotted owl (S. occidentalis caurina) over the past century. The Northern Spotted Owl Recovery Plan recommended removal experiments to assess both the effect of barred owls on spotted owls and the feasibility of initiating some form of barred owl control to enhance recovery of the northern spotted owl. Concern has been raised that such experiments will be neither feasible nor cost‐effective. To assess these and other concerns, we conducted lethal removal of barred owls within 3 areas totaling 85,205 ha in northern California, USA. We collected 73 of 81 territorial barred owls detected from 2009 to 2012 during 122 field visits. It took an average of 2 hr 23 min to collect each barred owl from the time of arrival at a site to the time a collected bird was completely processed for field data. Most barred owls were collected within one‐half hour of arrival at a site. Lethal removal of barred owls was rapid, technically feasible, and cost‐effective. We provide recommendations for techniques we found to be effective. © 2013 The Wildlife Society.

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A tale of two voles: The challenge of the commonness-rarity continuum in conservation planning. Reply to comments

Rosenberg

2019

Forest Ecology and Management

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Maximizing Endangered Species Research

Cited by 4 publications

References 1 publication

Potential trophic cascades triggered by the barred owl range expansion

Potential trophic cascades triggered by the barred owl range expansion

Removing barred owls from local areas: Techniques and feasibility

A tale of two voles: The challenge of the commonness-rarity continuum in conservation planning. Reply to comments

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