Recovery Plan for the Northern Spotted Owl - DRAFT

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__Discussiondata from 41 sites in the Andrews study area. We did not have individualidentification on the birds from the Meyer et al. (1992) study so disappearancesthat were replaced before the start of the next season would not have beendetected. We did have individual identification for the birds on the AndrewsForest and more accurate estimates of turnover rates.We analyzed the two data sets separately and in combination. In all threeanalyses, persistence increased with habitat quality. The increase was significantin the BLM data set, not significant in the Andrews data set, and highlysignificant in the combined data set (Figure B. 1, Table B. 15). Neither theslopes nor the intercepts in the two data sets differed significantly (or close tosignificantly). In the combined data set, there was no evidence of nonlinearity.Heteroscedasticity (i.e., unequal variances) was evident but this causes no biasin the estimate of slope.Simpson Timber Company (1991) reported that 0.72 young per pair wereproduced by 50 owl pairs in 1990 and that 0.63 young per pair were producedby 92 pairs in 1991; 68 percent of the new recruits in 1991 were adults, and:the turnover rate between 1990 and 1991 was 15 percent; three of 19 birdswere found elsewhere and had moved rather than died. These values weresimilar to the values obtained nearby in the Willow Creek study area.The evidence suggesting that adult survivorship varies with amount of olderforest in the home range is important because population viability is highlysensitive to adult survival rates. Obtaining more information of this sort shouldbe a high priority for the future.Results from Simpson Timber Company suggesting that rates of reproductionand adult survival are similar on Simpson's land and at Willow Creek areencouraging. The next few years should provide a good indication of howsimilar long-term reproduction and survival rates are at these two sites andprovide a good basis for developing conservation programs on private land inthis area. Identifying the key habitat features and analyzing whether they willremain present in the future should be a high priority in this study.Table B.1 5. Regression analysis of occupancy data from the Andrews ExperimentalForest and the BLM in Oregon.Regression Equation Standard LevelNumber (h = proportion of Error ofof area covered by of the Signi-Study Nests suitable habitat) Slope ficanceBLM 50 0.58 + 0.40h 0.18 -0.03AndrewsExperimentalForest 41 0.75 + 0.19h 0.18 -0.30Combineddata set 91 0.63 + 0.39h 0.12 -0.005310
1.0 x xx x x 0 )OOQOX xx 0 OXO 000 x 0o0 0 0o0 000.8 H- x0xx00 00xxx xx xx xo x ox 00 0 0 000 0xxo 0 0x x x0.6 1-x x o xgC,)0 0 0C) 0.4xxAndrews Experimental Forest 0Andrews Experimental Forest °Oregon Cascades Province0.2XBLM land in southern Oregon x0.00.0 0.2 0.4 0.6 0.8 1.0Proportion Suitable HabitatFigure B. 1. Relationship between annual adult survival rates and proportion of the area within 1.3 miles of the activity center covered by older forest.
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I 1.2:Sp 6/draftRecovery Plan for t
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List of FiguresTable 4.1 Abbreviate
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Recovery ObjectiveSecretary of the
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Management Rules for Designated Con
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Monitoring and Research ProgramThe
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Chapter IIntroduction1
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"Threatened species" means a specie
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B. The Interagency Scientific Commi
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lished works and many government do
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II.A. Natural History of theNorther
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I- \IzXelT - - -.11 I..., ... I.."
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spring. Territories probably are sm
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Northern goshawks (Accipiter gentil
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also use a variety of nest sites in
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Home Range SizeHome range is define
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Table 2.2. Median amounts of old-gr
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3. Life Historycannot reject the hy
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Dispersal1984, Thomas et al. 1990,
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4. ConclusionOur knowledge of the n
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Ca n a d aEastern Washington Cascad
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Table 2.3. Estimated spotted owl ha
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Table 2.4. Significant threats to t
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Table 2.5. Results of surveys for s
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isolated. In these provinces, small
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centers for 30 to 35 spotted owl te
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Southwest Washington occupies a key
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Distribution of Habitat and Populat
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Province Isolation. The eastern Was
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were in suitable habitat condition.
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Estimated acres of forest landbase:
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owned and contain little suitable h
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Vulnerability to Natural Disturbanc
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Douglas-fir/hardwood types, the lat
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miles from the contiguous populatio
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In comparison, the southern part of
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Sacramento River Canyon now provide
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On January 11, 1980, there was an a
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vation Strategy for the Northern Sp
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transfer of one area to the Grand R
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The BLM Spokane (Washington) Distri
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3. National Park ServiceThe followi
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The results of a consultation are s
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- Since landowners already face cut
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4. Cumulative Effects AssessmentThe
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Assessment, Planning, and Monitorin
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Spotted owl nesting sites and activ
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Coastal Oregon Productivity Enhance
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including wildlife. In other cases,
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Currently, the Yakima Indian Nation
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where timber harvest is limited to
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III.A. Recovery Objective and Delis
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4. The population is unlikely to ne
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Needs of other species should be co
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years. The strategy of managing for
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't0
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Finally, the plan recommends mainta
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A total of 1,181 pairs of owls has
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DKnown owlsin the OregonprovincesKn
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mologists, and representatives of o
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this prey species is an appropriate
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After 100 years residual snags will
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2. Fuelwood Gathering. If allowed,
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The application of prescriptions A,
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owls. (Refer to tables in section I
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PRESCRIPTION D -RETAIN OWLS IN MANA
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126
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DCA Management Plans.The recovery p
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Endangered Species Act) or through
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6. Costs to landowners should be re
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The real or perceived disincentives
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authority of the public body to ent
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* Use the recovery plan's recommend
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140
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Supplemental pair areas - Habitat d
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Numbers of owls currently are estim
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Biological goals and implementation
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ning. Also, several unsurveyed area
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Owl pairsKnown owlsin the province3
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- Initiate long-range planning effo
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Table 3.8. Summary comments on the
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from nonfederal lands are needed to
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Eastern Washington Cascades Provinc
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(Owl pairs140 - _ _ _ _ _ _ _ _ _ _
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habitat in DCA WD- 16. Approximatel
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Table 3.12. Summary comments on the
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Ttllwrnook/Astoria area. Provide su
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connectivity between key DCAs. This
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ITable 3.14. Summary comments on th
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crest of the Cascade Mountains. The
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sites on federal lands (figure 3.21
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Owl pairsL I 350- _ _ . ...........
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DCAs, often combined with adjacent
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Owl pairsLiKnown owlsin the provinc
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nesting and roosting habitat until
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Option 3: Management of clusters: g
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Table 3.21. Summary of acreage and
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Owl pairs -Known owlsin the provinc
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and to within 0.5 miles of the acti
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Spotted owls have been found at 86
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their distance from other sites. Ar
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* Recommend population and habitat
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away in some or all of the range. D
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4. What are the population dynamics
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If the monitoring and research prog
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lowlands, eastern Oregon Cascades,
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210
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Stepdown Outline1. Management Tasks
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Table 4.1 Abbreviated Cost TableThe
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continued-TaskPriorityResp. PartyCo
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218
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220
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and the number of invertebrate anim
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Table 5.2. Numbers of other species
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Amphibians and Reptiles: Larch Moun
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228
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230
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Barrows, C. W. 1980. Feeding ecolog
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Clark, R. J., D. G. Smith, and L. H
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Franklin, A. B., J. A. Blakesley, a
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Harestad, A. S., and F. L. Bunnell.
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Lundquist, R. W. and J. M. Mariani.
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O'Halloran, K. 1989. Spotted owl in
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Solis, D. M. 1980. Habitat use by n
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Young, K. D., A. B. Franklin, and J
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248
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250
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Table A.1. General approaches for e
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complete count of the territorial b
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Table A.3. Powera for various desig
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Table A.4. Illustration of a Markov
Page 276 and 277: Obviously, these statements hold on
Page 278 and 279: Table A.6. Reliability of trend est
Page 280 and 281: Demographic AnalysisAs noted earlie
Page 282 and 283: the estimate (using the simple equa
Page 284 and 285: however, we know little about the b
Page 286 and 287: Table A.8. Summary of information n
Page 288 and 289: predict the power achieved by diffe
Page 290 and 291: Other studiestached. If dispersing
Page 292 and 293: impractical at present. We describe
Page 294 and 295: Conclusionsthe year effect can be i
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Page 302 and 303: owls. Consequently, the issue of wh
Page 304 and 305: Use of the informationAssessments a
Page 306 and 307: Recent LiteratureWe might begin by
Page 308 and 309: Kerms (1989) measured habitat struc
Page 310 and 311: Hamer (pers. comm.) described 11 ne
Page 312 and 313: Table B.3. Percent hardwoods in the
Page 314 and 315: Table B.5. Comparison of habitats u
Page 316 and 317: Table B.8. Tree density (number of
Page 318 and 319: and numbers of trees, and percent o
Page 320 and 321: Under this hypothesis, owl fitness
Page 322 and 323: suitable habitat for that region (m
Page 324 and 325: ResultsDiscussionspotted owl habita
Page 328 and 329: Recommendations for Future Research
Page 330 and 331: 314
Page 332 and 333: Hamer, T. 1988. Home range size of
Page 334 and 335: 318
Page 336 and 337: 320
Page 338 and 339: Parameter Estimatesfor Individual S
Page 340 and 341: provided in Table C. 5. Study of th
Page 342 and 343: Table C.6. Summary of statistics re
Page 344 and 345: 3. ConclusionsThis source of bias i
Page 346 and 347: 330
Page 348 and 349: Gray Wolf .........................
Page 350 and 351: formed during the initial meeting t
Page 352 and 353: provide habitat for the numerous sp
Page 354 and 355: The ApproachA committee of the Reco
Page 356 and 357: The List of Threatened and Endanger
Page 358 and 359: Mammalsoldest trees in a stand. Eig
Page 360 and 361: ABBFigure D. 1. Distribution of: a)
Page 362 and 363: KTable D.3. A list of threatened an
Page 364 and 365: Fishestheir dispersal capabilities
Page 366 and 367: OlympicNorthcoastalRockyMountainSou
Page 368 and 369: continued-StatusabState Considered
Page 370 and 371: continued-SpeciesColumbia sidebandM
Page 372 and 373: endemic to the Pacific Northwest).
Page 374 and 375: ------continued-SpeciesRhyacophila
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continued-SpeciesFed3tatusa bStateW
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StatusasbOld ForestState Associatio
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Summaryspores (Maser et al. 1978b).
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Biology of Owl Prey, Older Forest A
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Woodrats.-The dusky-footed woodrat
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and are less restrictive under stat
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Stock concept.-The term "stock" was
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Table D.10. List of fish stocks of
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continued-Steelhead-owipu Sea-runTr
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continued-BasinHoodWillametteRogueS
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Table D.13. Washington streams (or
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inland distribution currently decre
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nesting territories in the three st
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However, little is known about the
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Fisher (Martes penncmti)Distributio
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at one time supported marten popula
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each population of these animals is
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species also is found under the bar
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few meters from water after heavy r
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In considering the needs of other s
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Barrows, C. W. 1981. Roost selectio
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Clark, T. W., E. Anderson, C. Dougl
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Hamer, T. E. 1991. Habitat relation
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Mannan, R. W., E. C. Meslow, and H.
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Oakley, A. L., Collins, J. A., Ever
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Solis, D. M. 1983. Summer habitat e
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Washington Natural Heritage Program
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414
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f. Wilderness.g. Livestock grazing.
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I. Monitoring.1. Northern spotted o
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420
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here will reduce some of that habit
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424
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426
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Selection of Forest TypesAt the tim
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eceive as little as 25 inches. Disc
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A. FireThe combination and interact
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Table F.4. Important forest insects
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continued-Common Name Causal Agent
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D. DiseasesForest diseases in the P
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III. Forest Protection in theWest C
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120 100200 500I~~~~.K446Figure F.4.
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InsectsDiseasesInsects in this subr
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__hardwoods are immune. Shade toler
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pests (Schowalter 1988). Black stai
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tion and initial attack. If manipul
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log and snag density was likely low
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B. Management Effects on StandsMana
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units (underburning or lop/scatter)
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In the higher elevation White Fir a
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growth often increases (Reinhardt a
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50rcc4*0-cC)2M CmZ13010-yearI ,...*
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In the East Cascades subregion fore
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The introduced disease, white pine
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VI. Conclusionsmortality will resul
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Baker, F.A. 1988. The influence of
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Habeck, J.R. 1990. Old-growth ponde
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Perry, D.A., and J.G. Borchers. 199
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Weatherspoon, C.P., and C.N. Skinne
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482
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484
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area, structure, ages, location; ne
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Stand AFigure G.2. A--unthmnned Dou
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figure 0.3. Effects of thinning Dou
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II. Review of Natural Vegetation an
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western hemlock, and sometimes othe
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year intervals (Appendix F). With t
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Live crown ratiobecent)6050IStand A
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Basal area growth continued to incr
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technology probably will allow some
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Stand A. No activities (west side 3
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Stand A. No activities (west side o
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acre, 4 to 12 inches in diameter),
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allow redwood sprout clumps maximum
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KAge 15 years - 511 trees per acre,
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6Stems per acre100 _ Stand A. Natur
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Basal Area(square feetper acre)50 1
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* Opening the canopy in small patch
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Drew, T.J. and J.W. Flewelling. 197
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Miller, R.E.; D.L. Reukema, and R.L
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Tappeiner, J.C., P.M. McDonald, and
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526
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528
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6. Timber supply curve and economic
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scientifically credible biological
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E. Summary of Preliminary Estimates
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II. General Economic Principles for
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practices may be able to show how s
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Economic patterns show the efficien
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The sustainable yield concept that
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A. Previously Estimated Economic Co
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County receipts were estimated to d
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B. Potential Social Costs of Owl Co
Page 566 and 567:
The contrast between the behavior d
Page 568 and 569:
0U1 n1nDTable H.2. Economic depende
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cḻlTable H.4. Economic characteri
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An analysis completed by the State
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V. Preliminary Evaluation of the Ec
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25-° 20/0M 15-a)CLU)0 10-0CL 5 -0)
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25 -- 20-0co/o 15--Da)a0a)10m~ C) 5
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forestlands. The costs of productio
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In Figure H.8, the equilibrium betw
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foregone and the way they will save
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The income created by the purchase
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Two concepts are useful for underst
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y an estimate of the price that wou
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Table H.10. Comparison of timber em
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of the second year. The same assump
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are generally much lower than for c
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582
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studies at University of Washington
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586
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Most significant late successionall
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to evaluate options. Information in
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Q0Table 1.1. Estimated acres and ow
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soTable 1.3. Estimated acres and ow
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01CDarTable 1.5. Size class distrib
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Table 1.8. Frequency distribution o
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Literature CitedThomas, J.W., E.D.
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602
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- The overlap of home ranges among
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Table J.2. Acreage and owl numbers
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continuedDCA Land AcreageIdent. Sta
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Table J.9. Acrea ?e and owl numbers
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continued-DCA LandIdent. StatusAcre
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-DCAIdent.LandStatusAcreageNRF Tota
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626
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Experience Includes: Assistant Dire
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Education: B.S. in forestry from Or
Page 648 and 649:
Team SupportCharles Bruce, Oregon D
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continued-1 5-24-91 Other SpeciesSu
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continued-9-16 thru9-20-919-19-91Sp
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Perry, D. 1991. The ecology of coar
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2mandate the achievement of recover
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642
Page 660 and 661:
644
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Aspect - the direction a slope face
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Congressionally classified and desi
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Empirical - derived from direct obs
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Hummocky - a landscape characterize
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Mixed conifer - as used in this doc
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Potential habitat - a stand of tree
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Sensitive species - those species t
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Take -Uunder the Endangered Species
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wild, scenic, or recreational by an
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