scholarly journals Range-wide declines of northern spotted owl populations in the Pacific Northwest: A meta-analysis

2021 ◽  
Vol 259 ◽  
pp. 109168
Author(s):  
Alan B. Franklin ◽  
Katie M. Dugger ◽  
Damon B. Lesmeister ◽  
Raymond J. Davis ◽  
J. David Wiens ◽  
...  
1998 ◽  
Vol 41 (1) ◽  
pp. 1-26 ◽  
Author(s):  
William R. Freudenburg ◽  
Lisa J. Wilson ◽  
Daniel J. O'Leary

The protection of habitat for an officially designated “threatened” species, the Northern Spotted Owl, is widely seen as having endangered the survival of a very different “species,” namely the rural American logger. In spite of the widespread agreement on this point, however, it is not clear just how many jobs have been endangered, over just how long a period, due to the protection of spotted-owl habitat and of the environment more broadly. In the present paper, we analyze longer term employment trends in logging and milling, both nationally and in the two states of the Pacific Northwest where the spotted-owl debate has been most intense, to determine the length of time over which such environmental protection efforts have been creating the loss of logging and milling jobs. There are three potential key “turning points” since the start of high-quality employment data in 1947—the 1989 controversy over the federal “listing” of the Northern Spotted Owl under the Endangered Species Act, the earlier increase in environmental regulations accompanying the first Earth Day in 1970, and the still-earlier “locking up” of timber after the passage of the Wilderness Protection Act in 1964. We also examine the effects of two other variables that have received considerable attention in the ongoing debates—levels of U.S. Forest Service timber harvests and the exporting of raw logs. We find that the 1989 listing of the spotted owl has no significant effect on employment—not even in the two states where the debate has been most intense. Instead, the only statistically significant turning point came with the passage of the Wilderness Act in 1964. The direction of the change, however, was precisely the opposite of what is generally expected. Both nationally and in the Pacific Northwest, the greatest decline in timber employment occurred from 1947 until 1964—a time of great economic growth, a general absence of “unreasonable environmental regulations,” and growing timber harvests. The period since the passage of the Wilderness Act has been one of increased complaints about environmental constraints, but much less decline in U.S. logging employment. If logging jobs have indeed been endangered by efforts to protect the environment in general and spotted-owl habitat in particular, what is needed is a plausible explanation of how the influence of the owls could have begun more than forty years before the species came under the protection of the Endangered Species Act.


1994 ◽  
Vol 1 (2) ◽  
pp. 86
Author(s):  
David B. Lindenmayer

Mr. Macfarlane and Mr. Loyn have failed to recognize the main thrust of the recent article comparing the development of management strategies for the conservation of the Northern Spotted Owl in the Pacific Northwest of the USA and Leadbeater's Possum in Central Victoria (Lindenmayer and Norton 1993). The key issue was not to compare the biology of the respective taxa; that would be nonsensical. Rather, it was to highlight that, unlike the management of Leadbeater's Possum (Macfarlane and Seebeck 1991), conservation strategies for the Northern Spotted Owl have now been developed that are ecologically defensible and scientifically valid (Murphy and Noon 1992).


2018 ◽  
Vol 131 (3) ◽  
pp. 225-227
Author(s):  
Jesse M. Alston ◽  
Janet E. Millard ◽  
Jessica A. Rick ◽  
Brandon W. Husby ◽  
Laurel A. Mundy

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.


1997 ◽  
Vol 94 (1-3) ◽  
pp. 1-14 ◽  
Author(s):  
R. Everett ◽  
D. Schellhaas ◽  
D. Spurbeck ◽  
P. Ohlson ◽  
D. Keenum ◽  
...  

The Condor ◽  
2003 ◽  
Vol 105 (1) ◽  
pp. 45-53 ◽  
Author(s):  
Elizabeth G. Kelly ◽  
Eric D. Forsman ◽  
Robert G. Anthony

Abstract Barred Owls (Strix varia) have expanded their range into the Pacific Northwest, and anecdotal evidence suggests that they may be displacing the federally threatened Northern Spotted Owl (Strix occidentalis caurina). Our objectives were to describe the current status of Barred Owls in Oregon and compare occupancy of Spotted Owls in historic Spotted Owl territories before and after Barred Owls were first detected in those territories. Between 1974 and 1998, we estimated that 706 different Barred Owl territories were located in Oregon. From 1989–1998 an average of 60 new Barred Owl territories were located in Oregon each year. In Spotted Owl demographic study areas in Oregon and Washington, Barred Owl detections increased at Spotted Owl territories from 1987–1999. Occupancy of Spotted Owl territories declined after Barred Owls were detected within 0.80 km of the territory center. When Barred Owls were detected 0.81–2.40 km from Spotted Owl territory centers, occupancy of Spotted Owls was only marginally less than at territories without Barred Owls. This suggests that the frequency and intensity of interactions between the two species is negatively associated with distance between them. Our results suggest that land managers and regulatory agencies should regard Barred Owls as a threat to Spotted Owls, particularly if Barred Owls continue to increase in number as they have during the past 25 years. ¿Está Strix varia Desplazando a Strix occidentalis caurina? Resumen. Desde su expansión hacia el Pacífico Noroeste, existe evidencia anecdótica de que Strix varia podría estar desplazando a S. occidentalis caurina. Nuestros objetivos fueron describir el estatus actual de S. varia en Oregon y comparar la ocurrencia de S. occidentalis caurina en sus territorios históricos antes y después de que S. varia se detectó por primera vez en dichos territorios. Entre 1974 y 1998, estimamos que se confirmaron 706 territorios diferentes de S. varia en Oregon. Entre 1989 y 1998, se localizaron en promedio 60 nuevos territorios de S. varia anualmente. En áreas con estudios demográficos de S. occidentalis caurina en Oregon y Washington, las detecciones de S. varia en territorios de S. occidentalis caurina se incrementaron entre 1987 y 1999. En comparación con territorios sin S. varia, la ocupación de territorios de S. occidentalis caurina disminuyó luego de que se detectaron individuos de S. varia a menos de 0.80 km del centro del territorio. Cuando se detectaron individuos de S. varia entre 0.81 y 2.40 km del centro de los territorios, la ocupación de éstos fue sólo marginalmente menor que en territorios sin S. varia. Esto sugiere que la frecuencia e intensidad de la interacción entre las dos especies está asociada con la distancia entre ellas. Nuestros resultados sugieren que las autoridades ambientales y de regulación deben considerar a S. varia como una amenaza para S. occidentalis caurina, particularmente si los números de S. varia se siguen incrementando como en los últimos 25 años.


Birds ◽  
2021 ◽  
Vol 2 (2) ◽  
pp. 147-157
Author(s):  
Chad T. Hanson ◽  
Derek E. Lee ◽  
Monica L. Bond

The Spotted Owl is a rare and declining raptor inhabiting low/middle-elevation forests of the Pacific Northwest, California, and the Southwest in the USA. It is well established that Spotted Owls select dense, mature, or old forests for nesting and roosting. High-severity fire transforms such forests into a unique forest type known as “snag forest habitat”, which the owls select for foraging. This habitat is disproportionately targeted by post-fire logging projects. Numerous recent articles have explored the influence of high-severity fire and post-fire logging on this species. Studies have shown that post-fire logging significantly reduces Spotted Owl occupancy, but efforts have generally not been made to disentangle the effects of such logging from the influence of high-severity fire alone on Spotted Owls. We conducted an assessment of published, peer-reviewed articles reporting adverse impacts of high-severity fire on Spotted Owls, exploring the extent to which there may have been confounding factors, such as post-fire logging. We found that articles reporting adverse impacts of high-severity fire on Spotted Owls were pervasively confounded by post-fire logging, and in some cases by a methodological bias. Our results indicate a need to approach analyses of high-severity fire and Spotted Owls differently in future research.


1998 ◽  
Vol 62 (4) ◽  
pp. 1398 ◽  
Author(s):  
Katherine T. Hershey ◽  
E. Charles Meslow ◽  
Fred L. Ramsey

1994 ◽  
Vol 1 (1) ◽  
pp. 13 ◽  
Author(s):  
David B. Lindenmayer ◽  
Tony W. Norton

Aspects of the conservation and management of the endangered species Leadbeater's Possum Gymnobelideus leadbeateri in southeastern Australia and the Northern Spotted Owl Strix occidentalis caurina in the Pacific north-west of the USA are similar in their nature and the intensity of public debate. Both species occur in temperate forests that are also used for intensive wood production. Due to historial factors and present forestry management regimes, a major conflict in land-use exists between the conservation of these animals and intensive timber harvesting in both geographic regions. The long-term persistence of Leadbeater's Possum and the Northern Spotted Owl will depend primarily on the protection and appropriate management of mature and old growth stands or attributes of such types of forest. The Interagency Spotted Owl Scientific Committee developed a set of guiding biological principles and used knowledge of the autecology and natural history of the species to formulate a management plan to help ensure the viability of populations of the Northern Spotted Owl beyond the next century. Unfortunately, the strategies currently proposed for the conservation of Leadbeater's Possum are unlikely to ensure its long-term persistence, and, therefore, the Victorian Government's position on this matter is inconsistent with its undertakings in the new National Forest Policy. We discuss the application of the approach and strategies proposed by the Interagency Committee to the conservation of Leadbeater's Possum. Attempts to manage the Northern Spotted Owl and Leadbeater's Possum will reflect the ability of governments to pursue truly ecologically sustainable development and resource use.


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