# Conservation Biology

Announcements Corrected mistakes on slides from last lectures VORTEX Help READ VORTEX survival guide! Leads you step by step through VORTEX. Get started this weekend so you can identify any problems before its too late!

General Predictors of Extinction - Population Growth +

Current population size Population Size Deterministic Variation in B&D: Density Calculation of r from life table assumes density-independent model

Density-Dependence in Vortex DI: growth w/ ceiling Population Size X 0

Time K, maximum size DD Growth Rate Where Are We Measuring r

0 Intrinsic r or r-max K Density Realized r

Growth Rate Are we measuring r at K? 0 r-max DI Model

Density K DD Model DD in Vortex Implication of DD vs. DI

Assuming DI may bias the probability of persistence, depending on where r-realized is measured Unfortunately, these essential data are rarely available! % Breeding Rhino PVA

45 40 33 Density Additional assignment for grad. students: Report to class next Wednesday.

DD in Vortex Only possible for % females breeding. Work around possible for DD in survivorship. If DD growth is expected for your population, specify that reproduction is DD, and follow instructions (see Tashi or myself for help).

The Allee Effect in Vortex Decide if an Allee effect is appropriate for your population. If so, specify that reproduction is DD, and follow instructions (see Tashi or myself for help). Critiques of PVA Models require too much data

Models typically result in wide confidence intervals. Models can not be validated Focus instead on parameter estimation. Models are error prone Model Output = Model Input

Parameter Estimates Vortex Model Predictions Creativity and VORTEX Vortex assumes one reproductive season/year. If your species has 2 clutches/yr., then:

A Defense of PVA Brook, B. W., J. J. O'Grady, A. P. Chapman, M. A. Burgman, H. R. Akakaya, and R. Frankham. 2000. Predictive accuracy of population viability analysis in conservation biology. Nature 404:385-387. Conceptual Utility of PVA It identifies the population, not land, as the critical unit for conservation purposes.

The term viability stresses long term population persistence and emphasizes selfsustainability. The idea of minimum emphasizes that there may be a threshold below which a population is doomed to extinction.

## Recently Viewed Presentations

• DNA "Overload" - In time as the cell grows larger; the DNA can no longer serve its increasing needs Volume increases faster than the surface area of a growing cell Surface Area- to- Volume Ratio The surface area-to-volume will decrease....
• 3.Nitrazine paper test นำกระดาษ nitrazineสัมผัสกับน้ำในช่องคลอดจะมีการเปลี่ยนสีน้ำในช่องคลอดของหญิงตั้งครรภ์จะเป็นกรดมีค่า pH อยู่ระหว่าง 4.5-6.0 ...
• Lisa Harris, Stuart Segal, Pat Gurin. Student Engagement Chair: Amir . Baghadadchi. Strategic Lead Team. Nate Hill, Sarah Button, Abby Fanelli, Zikra Hussain. Strategic Ops Team: Jennifer Schrage (Lead), Anita Bohn & Lindsey Ferguson. Implementation Teams. Summary of Plan. STUDENT...
• 10. 유무선 통합 서비스 * * * * * Tip: 망중립성 망중립성은 서비스나 트래픽의 비차별성뿐만 아니라 망 사용자의 자유로운 선택권까지도 포함하는 포괄적인 개념 따라서 망중립성은 기술적인 문제뿐만 아니라 정치경제적, 사회적, 그리고 문화적인 다양한 요소들을 포함 국내에서도 2011년 망중립성 ...