Lecture16Ryder.pdf - BILD 3 March 7 2016 Oliver A Ryder...

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
3/6/17 1 BILD 3 March 7, 2016 Oliver A. Ryder Conservation Ecology Outline of Lecture 3/7/2017 A brief history of conservation movement and the role of UCSD ESA Conservation Biology Intrinsic challenges of facing small populations and approaches to amelioration Application of population genetics theory endangered species management Assessing genome-wide variation as a conservation tool California condor as a case study Genetic rescue The Frozen Zoo® Northern white rhino as a case study Ecological genomics: emerging use of genome-wide variation data to identify heritable basis for ecological diversification Joseph Grinell, 1877-1939 Univ. of California Habitat protection as a conservation tool
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
3/6/17 2 1973 U.S. Endangered Species Act Michael Soulé Conservation Biology Society for Conservation Biology Founded in 1985 Threats to species survival: historical to present Commercial hunting passenger pigeon Stellar’s sea cow American bison Carolina parakeet Invasive species rats, especially on islands novel diseases Habitat loss environmental toxicants – DDT fragmentation – black-footed ferret Illegal poaching illegal logging rare birds – for pets, for products rhinoceros species
Image of page 2
3/6/17 3 Most previous considerations of inbreeding risks (in zoo populations) had been theoretical. Management of Small Populations Small = endangered (loss of genetic variation, adaptive potential) Constraints: founder effect : 1-1/2N for average heterozygosity inbreeding : probability of identity by descent genetic drift: 1-(1/2Ne) t selection: alleles of successful successful individuals become more common introgression: inappropriate hybridization or swamping How few = endangered? Ne=50 Why? And, is it time to reconsider? N=census population size Ne(effective population size)=number of individuals contributing games to next generation Units of Conservation Management The “Evolutionarily Significant Unit” (ESU) Practical application invokes species definition concepts Frankham, et al., 2012. Biol Conserv
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
3/6/17 4 Outbreeding Depression Loss of fitness due to incompatibilities of parental genomes Sterile hybrids mules, dik-dik Lower reproduction Disruption of co-adapted gene complexes (supergenes) white-throated sparrow Often, in outbreeding depression, chromosomal changes (i.e., relatively large genomic rearrangements or re- organization are involved).
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern