Survival estimates for the northern spotted owl

1998 ◽  
Vol 28 (11) ◽  
pp. 1681-1685 ◽  
Author(s):  
Paul C Van Deusen ◽  
Larry L Irwin ◽  
Tracy L Fleming
Keyword(s):  
Survival Rates ◽  
Field Studies ◽  
Washington State ◽  
Time Span ◽  
Spotted Owl ◽  
Strix Occidentalis ◽  
Adult Females ◽  
Northern Spotted Owl ◽  
Strix Occidentalis Caurina ◽  
Capture Recapture

An analysis of capture-recapture data is tailored to the biological characteristics of the female northern spotted owl (Strix occidentalis caurina) by conditioning female capture on capture of paired males. This procedure is relevant for animals such as the northern spotted owl where field studies indicate that capture of females generally is dependent on capture of their mates. Application of the method to data collected in Washington State suggests that survival rates for adult females have remained constant over the time span of our data, 1990-1997.

Influence of prey abundance on northern spotted owl reproductive success in western Oregon

2003 ◽  
Vol 81 (10) ◽  
pp. 1715-1725 ◽  
Author(s):  
Daniel K Rosenberg ◽  
Keith A Swindle ◽  
Robert G Anthony
Keyword(s):  
Reproductive Success ◽  
Temporal Variability ◽  
Life History Strategy ◽  
Prey Abundance ◽  
Deer Mice ◽  
Spotted Owl ◽  
Strix Occidentalis ◽  
Flying Squirrels ◽  
Northern Spotted Owl ◽  
Strix Occidentalis Caurina

The hypothesis that high temporal variability of northern spotted owl (Strix occidentalis caurina) reproductive success is a response to prey abundance remains largely untested. We evaluated this relationship in the Oregon Cascade Mountains. Despite similar biomass of northern flying squirrels (Glaucomys sabrinus) (169 ± 13.9 g/ha) and deer mice (Peromyscus maniculatus) (160 ± 18.8 g/ha), flying squirrels dominated the breeding season diet based on both biomass (49%) and numbers (40%). Abundance of flying squirrels and western red-backed voles (Clethrionomys californicus) was more variable spatially ([Formula: see text]38% of process variation) than temporally (15%–24%), whereas abundance of deer mice was more similar across stands (12% spatial variation) than among years (68% temporal variation). Spotted owl reproductive success was statistically associated only with the abundance of deer mice (number of young per territory: r2 = 0.68). However, deer mice comprised only 1.6 ± 0.5% of the biomass consumed. The low temporal variability of the dominant prey species provided evidence that simple prey relationship models were not likely to explain the highly synchronous and temporally dynamic patterns of spotted owl reproductive performance. Reproductive success was likely a result of the interaction of both weather and prey and the life history strategy of this long-lived owl.

scholarly journals Complete mitochondrial genome sequences of the northern spotted owl (Strix occidentalis caurina) and the barred owl (Strix varia; Aves: Strigiformes: Strigidae) confirm the presence of a duplicated control region

2017 ◽  
Author(s):  
Zachary R Hanna ◽  
James B Henderson ◽  
Anna B Sellas ◽  
Jérôme Fuchs ◽  
Rauri C. K. Bowie ◽  
...  
Keyword(s):  
Mitochondrial Genome ◽  
Control Region ◽  
Sequence Data ◽  
Complete Mitochondrial Genome ◽  
Nuclear Genome ◽  
Genome Sequences ◽  
Spotted Owl ◽  
Strix Occidentalis ◽  
Northern Spotted Owl ◽  
Strix Occidentalis Caurina

We report here the successful assembly of the complete mitochondrial genomes of the northern spotted owl (Strix occidentalis caurina) and the barred owl (S. varia). We utilized sequence data from two sequencing methodologies, Illumina paired-end sequence data with insert lengths ranging from approximately 250 nucleotides (nt) to 9,600 nt and read lengths from 100-375 nt and Sanger sequences. We employed multiple assemblers and alignment methods to generate the final assemblies. The circular genomes of S. o. caurina and S. varia are comprised of 19,948 nt and 18,975 nt, respectively. Both code for two rRNAs, twenty-two tRNAs, and thirteen polypeptides. They both have duplicated control region sequences with complex repeat structures. These are the first complete mitochondrial genome sequences of owls (Aves: Strigiformes) possessing duplicated control regions. We searched the nuclear genome of S. o. caurina for copies of mitochondrial genes and found at least nine separate stretches of nuclear copies of gene sequences originating in the mitochondrial genome (Numts).

scholarly journals Northern Spotted Owl (Strix occidentalis caurina) Genome: Divergence with the Barred Owl (Strix varia) and Characterization of Light-Associated Genes

2017 ◽  
Vol 9 (10) ◽  
pp. 2522-2545 ◽  
Author(s):  
Zachary R. Hanna ◽  
James B. Henderson ◽  
Jeffrey D. Wall ◽  
Christopher A. Emerling ◽  
Jérôme Fuchs ◽  
...  
Keyword(s):  
Spotted Owl ◽  
Strix Occidentalis ◽  
Strix Varia ◽  
Northern Spotted Owl ◽  
Strix Occidentalis Caurina ◽  
Genome Divergence

Comment on “Are survival rates for northern spotted owls biased?”Appears in Can. J. Zool. 83: 1386–1390.

2006 ◽  
Vol 84 (9) ◽  
pp. 1375-1379 ◽  
Author(s):  
A.B. Franklin ◽  
J.D. Nichols ◽  
R.G. Anthony ◽  
K.P. Burnham ◽  
G.C. White ◽  
...  
Keyword(s):  
Population Change ◽  
Survival Rates ◽  
Negative Bias ◽  
Strix Occidentalis ◽  
Spotted Owls ◽  
Strix Occidentalis Caurina ◽  
Capture Recapture ◽  
Northern Spotted Owls ◽  
Biased Estimates

Loehle et al. recently estimated survival rates from radio-telemetered northern spotted owls ( Strix occidentalis caurina (Merriam, 1898)) and suggested that survival rates estimated for this species from capture–recapture studies were negatively biased, which subsequently resulted in the negatively biased estimates of rates of population change (λ) reported by Anthony et al. (Wildl. Monogr. No. 163, pp. 1–47 (2006)) . We argue that their survival estimates were inappropriate for comparison with capture–recapture estimates because (i) the manner in which they censored radio-telemetered individuals had the potential to positively bias their survival estimates, (ii) their estimates of survival were not valid for evaluating bias, and (iii) the size and distribution of their radiotelemetry study areas were sufficiently different from capture–recapture study areas to preclude comparisons. In addition, their inferences of negative bias in rates of population change estimated by Anthony et al. were incorrect and reflected a misunderstanding about those estimators.

scholarly journals Complete mitochondrial genome sequences of the northern spotted owl (Strix occidentalis caurina) and the barred owl (Strix varia; Aves: Strigiformes: Strigidae) confirm the presence of a duplicated control region

2017 ◽  
Author(s):  
Zachary R Hanna ◽  
James B Henderson ◽  
Anna B Sellas ◽  
Jérôme Fuchs ◽  
Rauri C. K. Bowie ◽  
...  
Keyword(s):  
Mitochondrial Genome ◽  
Control Region ◽  
Sequence Data ◽  
Complete Mitochondrial Genome ◽  
Nuclear Genome ◽  
Genome Sequences ◽  
Spotted Owl ◽  
Strix Occidentalis ◽  
Northern Spotted Owl ◽  
Strix Occidentalis Caurina

We report here the successful assembly of the complete mitochondrial genomes of the northern spotted owl (Strix occidentalis caurina) and the barred owl (S. varia). We utilized sequence data from two sequencing methodologies, Illumina paired-end sequence data with insert lengths ranging from approximately 250 nucleotides (nt) to 9,600 nt and read lengths from 100-375 nt and Sanger sequences. We employed multiple assemblers and alignment methods to generate the final assemblies. The circular genomes of S. o. caurina and S. varia are comprised of 19,948 nt and 18,975 nt, respectively. Both code for two rRNAs, twenty-two tRNAs, and thirteen polypeptides. They both have duplicated control region sequences with complex repeat structures. These are the first complete mitochondrial genome sequences of owls (Aves: Strigiformes) possessing duplicated control regions. We searched the nuclear genome of S. o. caurina for copies of mitochondrial genes and found at least nine separate stretches of nuclear copies of gene sequences originating in the mitochondrial genome (Numts).

scholarly journals Observations of Notable Parental Behaviours of Northern Spotted Owls (Strix occidentalis caurina)

2018 ◽  
Vol 131 (3) ◽  
pp. 225-227
Author(s):  
Jesse M. Alston ◽  
Janet E. Millard ◽  
Jessica A. Rick ◽  
Brandon W. Husby ◽  
Laurel A. Mundy
Keyword(s):  
Pacific Northwest ◽  
Black Bear ◽  
Black Bears ◽  
Spotted Owl ◽  
Strix Occidentalis ◽  
Dietary Breadth ◽  
The Pacific ◽  
Northern Spotted Owl ◽  
Strix Occidentalis Caurina ◽  
Conservation Concern

Northern Spotted Owl (Strix occidentalis caurina) is a medium-sized forest owl of conservation concern in the Pacific Northwest of North America. We report two sightings of previously unreported parental behaviour: a Northern Spotted Owl feeding avian nestlings to its young and a Northern Spotted Owl defending a fledgling against a Black Bear (Ursus americanus). Further research may be warranted on the influence of brood size and habitat quality on dietary breadth. Although Black Bears have not been previously documented as Northern Spotted Owl predators, we suggest that they should be considered potential predators of nestling and fledgling owls.

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