Population Dynamics of the California Spotted Owl (Strix occidentalis occidentalis): A Meta-Analysis

Franklin, Alan B.; Gutiérrez, R. J.; Nichols, James D.; Seamans, Mark E.; White, Gary C.; Zimmerman, Guthrie S.; Hines, James E.; Munton, Thomas E.; LaHaye, William S.; Blakesley, Jennifer A.; Steger, George N.; Noon, Barry R.; Shaw, Daniel W. H.; Keane, John J.; McDonald, Trent L.; Britting, Susan

doi:10.2307/40166799

Cited by 98 publications

(163 citation statements)

References 55 publications

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“…In the case of the NGYE, ignoring the contribution via dispersal would suggest the population was a sink, whereas not accounting for immigration would fail to show its own dependence on immigration. Indeed, the NGYE may be a ''dependent source'' which acts as a source of recruits for surrounding areas, but relies on immigration for its own growth (Franklin et al, 2004;Hixon et al, 2002). Therefore, to retain natural population processes it may be advisable to conserve multiple, mutually supportive source areas, especially when annual contribution is variable as in our study populations.…”

Section: Population Contributionmentioning

confidence: 97%

Human-caused mortality influences spatial population dynamics: Pumas in landscapes with varying mortality risks

Newby

Mills

Ruth

et al. 2013

Biological Conservation

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b s t r a c tAn understanding of how stressors affect dispersal attributes and the contribution of local populations to multi-population dynamics are of immediate value to basic and applied ecology. Puma (Puma concolor) populations are expected to be influenced by inter-population movements and susceptible to humaninduced source-sink dynamics. Using long-term datasets we quantified the contribution of two puma populations to operationally define them as sources or sinks. The puma population in the Northern Greater Yellowstone Ecosystem (NGYE) was largely insulated from human-induced mortality by Yellowstone National Park. Pumas in the western Montana Garnet Mountain system were exposed to greater human-induced mortality, which changed over the study due to the closure of a 915 km 2 area to hunting.The NGYE's population growth depended on inter-population movements, as did its ability to act as a source to the larger region. The heavily hunted Garnet area was a sink with a declining population until the hunting closure, after which it became a source with positive intrinsic growth and a 16Â increase in emigration. We also examined the spatial and temporal characteristics of individual dispersal attributes (emigration, dispersal distance, establishment success) of subadult pumas (N = 126). Human-caused mortality was found to negatively impact all three dispersal components. Our results demonstrate the influence of human-induced mortality on not only within population vital rates, but also inter-population vital rates, affecting the magnitude and mechanisms of local population's contribution to the larger metapopulation.

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Section: Population Contributionmentioning

confidence: 97%

Human-caused mortality influences spatial population dynamics: Pumas in landscapes with varying mortality risks

Newby

Mills

Ruth

et al. 2013

Biological Conservation

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“…We point out that the spatial dependence model has two variants, and we constrained with habitat covariates the variant with the lowest AIC. This determination was made after comparing variants to each other without covariates and with latitude (Franklin et al 2004, Anthony et al 2006). The two variants of the spatial dependence model are: (1) the generalized spatial dependence model structure [ψ(.…”

Section: Discussionmentioning

confidence: 99%

Use of Occupancy Models to Evaluate Expert Knowledge-based Species-Habitat Relationships

Iglecia¹,

Collazo²,

McKerrow³

2012

ACE

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. 2012. Use of occupancy models to evaluate expert knowledge-based species-habitat relationships. Avian Conservation and Ecology 7(2): 5. http://dx.doi. org/10.5751/ACE-00551-070205 ABSTRACT. Expert knowledge-based species-habitat relationships are used extensively to guide conservation planning, particularly when data are scarce. Purported relationships describe the initial state of knowledge, but are rarely tested. We assessed support in the data for suitability rankings of vegetation types based on expert knowledge for three terrestrial avian species in the South Atlantic Coastal Plain of the United States. Experts used published studies, natural history, survey data, and field experience to rank vegetation types as optimal, suitable, and marginal. We used single-season occupancy models, coupled with land cover and Breeding Bird Survey data, to examine the hypothesis that patterns of occupancy conformed to species-habitat suitability rankings purported by experts. Purported habitat suitability was validated for two of three species. Research Papers Use of Occupancy Models to Evaluate ExpertAs predicted for the Eastern Wood-Pewee (Contopus virens) and Brown-headed Nuthatch (Sitta pusilla), occupancy was strongly influenced by vegetation types classified as "optimal habitat" by the species suitability rankings for nuthatches and wood-pewees. Contrary to predictions, Red-headed Woodpecker (Melanerpes erythrocephalus) models that included vegetation types as covariates received similar support by the data as models without vegetation types. For all three species, occupancy was also related to sampling latitude. Our results suggest that covariates representing other habitat requirements might be necessary to model occurrence of generalist species like the woodpecker. The modeling approach described herein provides a means to test expert knowledge-based species-habitat relationships, and hence, help guide conservation planning.RÉSUMÉ. Les relations espèces-habitat établies à partir des connaissances d'experts sont largement utilisées pour orienter la planification de la conservation, surtout lorsque les données sont rares. Ces relations présumées représentent les rudiments de la connaissance, mais sont rarement testées. L'adéquation du classement de milieux établi par des experts a été évaluée pour trois espèces de passereaux de la Plaine côtière de l'Atlantique Sud, aux États-Unis. Les experts ont utilisé des données publiées (recherches, histoire naturelle, relevés) et leur expérience sur le terrain afin de classer les milieux selon trois catégories, soit optimaux, adéquats ou marginaux. Nous avons appliqué des modèles de présence, fondés sur une seule saison, à des données d'occupation du sol et de relevés d'oiseaux nicheurs afin d'examiner l'hypothèse voulant que les profils de présence concordent avec le classement de la qualité des milieux présumé par les experts. La qualité présumée des milieux a été validée pour deux des trois espèces. Comme prédit pour le Pioui de l'Est (Contopus virens) et la Sittelle à t...

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“…In the Appendices , Noon (2004) reviews the history of population projection models as applied to Northern Spotted Owls, and in particular the models underlying the listing decision and the NWFP (chapter 9 provides a complementary perspective on the NWFP). As Noon shows, the basic premises of these models remain as valid now as in 1990 or 1994.…”

Section: Population Projections and Extinction Risksmentioning

confidence: 99%

Forest Structure Within Barred Owl (Strix varia) Home Ranges in the Eastern Cascade Range, Washington

Singleton

2015

Journal of Raptor Research

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Population Dynamics of the California Spotted Owl (Strix occidentalis occidentalis): A Meta-Analysis

Cited by 98 publications

References 55 publications

Human-caused mortality influences spatial population dynamics: Pumas in landscapes with varying mortality risks

Human-caused mortality influences spatial population dynamics: Pumas in landscapes with varying mortality risks

Use of Occupancy Models to Evaluate Expert Knowledge-based Species-Habitat Relationships

Forest Structure Within Barred Owl (Strix varia) Home Ranges in the Eastern Cascade Range, Washington

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