1 / 30

Conservation Genetics

Conservation Genetics. By: Capaccio, Rose Foschetti, Olivia Howland, Yvette Shahmehri, Nadia Strazzera, Josephine Younus, Muhammad. Conservation Biology + Genetics = Conservation Genetics.

zilya
Télécharger la présentation

Conservation Genetics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Conservation Genetics By: Capaccio, Rose Foschetti, Olivia Howland, Yvette Shahmehri, Nadia Strazzera, Josephine Younus, Muhammad

  2. Conservation Biology + Genetics = Conservation Genetics • Conservation biology is the study of individual species and populations that have been impacted by various human behaviors such as habitat loss and exploitation and/or environmental changes (learn.genetics.utah.edu) and finding ways to maintain and restorebiodiversity. • Conservation genetics is a mixture of ecology, molecular biology, population genetics, mathematical modeling and evolutionary systematics (learn.genetics.utah.edu). • Once scientists understand the genetic relationships of an organism, they may proceed with an appropriate management technique to preserve the biological and genetic diversity of a species. http://learn.genetics.utah.edu/archive/conservation/index.html

  3. Conservation GeneticsFrankham et al. 2002. Introduction to Conservation Genetics. Cambridge Univ. Press • Conservation genetics is the application of genetics to preserve species as dynamic entities capable of coping with environmental change • Genetic management of small populations • Resolution of taxonomic uncertainties • Identifying and defining units of conservation within and between species • Use of genetic information for wildlife forensics • Address genetic factors that affect extinction risk and genetic management to minimize or mitigate those risks

  4. Importance / Goals of Conservation Genetics • Genetics is a valuable resource towards conservation by reducing the amount of time spent of conserving the wrong population or on a population that may not be endangered (learn.genetics.utah.edu). • Conservation genetics provides new information about the diversity among the individuals in a population. • It is a tool to help maintain and restore population variability. • Without genetic diversity, biodiversity may be lost.

  5. 5 broad categories of conservation genetics publications(Allendorf and Luikart) Management and reintroduction of captive populations, and the restoration of biological communities Description and identification of individuals, genetic population structure, kin relationships, and taxonomic relationships Detection and prediction of the effects of habitat loss, fragmentation and isolation Detection and prediction of the effects of hybridization and introgression Understanding the relationships between adaptation or fitness and the genetic characters of individuals or populations

  6. Evolutionary genetics Taxonomic uncertainties Understanding species biology Introgression Population structure & fragmentation Forensics Outbreeding Small populations Inbreeding Loss of genetic diversity Mutational accumulation Reproductive fitness Extinction Genetic management Identify mgmt units Adaptation to captivity Wild Captive Reintroduction Conservation Genetics

  7. Use of Conservation Genetics 1. Habitat Destruction • A population is targeted by conservation managers when their habitat is or may be destroyed by human interference such as building homes or natural phenomena such as hurricanes. 2. Change in Population Size • When a population is reduced in size, genetic diversity may be adversely affected. The smaller the population, the more likely to be susceptible to random or unexpected events. http://learn.genetics.utah.edu/archive/conservation/when.html

  8. 11 major genetic issues in conservation biology(Frankham et al.) • Inbreeding and inbreeding depression • Loss of genetic diversity and adaptive potential • Population fragmentation and loss of gene flow • Genetic drift becomes more important than natural selection as main evolutionary force • Accumulation of deleterious mutations (lethal equivalents) • Adaptation to captivity and consequences for captive breeding and reintroductions • Taxonomic uncertainties masking true biodiversity or creating false biodiversity • Defining ESUs and management units within species • Forensic analyses • Understand species biology • Outbreeding depression

  9. 1. Protein Electrophoresis It compares the similar proteins between species found in a portion of the DNA sequence. 2. Chromosome Analysis It shows the differences in the number of chromosomes between closely related species. Tools http://learn.genetics.utah.edu/archive/conservation/tools/index.html

  10. Reduction in Gene Flow/Metapopulation • Gene flow is the gradual exchange of alleles between populations with the dispersal of gametes or the migration of individuals.  Migration is the main route for gene flow in animals and cross pollination and seed dispersion in plants.

  11. Habitat fragmentation has also led to a decline in gene flow among populations of threatened or endangered species due to the small separate colonies in which they exhist and their connection to their remaining habitat.  Habitat fragmentation by isolated population of species, affects the gene flow because surviving population do not have movement between the populations to encourage gene flow. Metapopulation describes the occurrence of spatially separated subpopulations with limited gene flow that results in extinction or replacements over time. (W.Klug, M. Cummings, C. Spencer, M. Palladino; Essentials of Genetics; Seventh Edition;  Pearsom Education, Inc. 2010; pp. 514-515)

  12. Many studies of current gene flow are aimed at understanding gene movement on a regional or landscape scale. As continuous populations become fragmented, they may assume metapopulation dynamics, through extinction and recolonization events of the different fragments.  Populations implicated in the metapopulation suffer genetic diversity and result in inbreeding depression.  It is not clear whether recent modeling approaches in metapopulation biology and landscape ecology offer viable insight on gene movement.  (http://www.nceas.ucsb.edu/nceas-web/projects/2057/nceas-paper3/data/Gfpart1.html). References: (W.Klug, M. Cummings, C. Spencer, M. Palladino; Essentials of Genetics; Seventh Edition;  Pearsom Education, Inc. 2010; pp. 514-515) http://www.amjbot.org/cgi/content/full/94/1/128 http://www.nceas.ucsb.edu/nceas-web/projects/2057/nceas-paper3/data/Gfpart1.html

  13. -3O,OOO yrs AAGACTT -20,000 yrs AAGATTT AGGACTT AAGATTT AGGACTT -10,000 yrs AAGGTTT AAGATTC AGGACTC AAGGTTT AAGATTC AGGACTC today AAAGTTT GAGATTC AGGATTC AGGATTC AGGGCTC DNA Sequence Evolution AAAGTTT GAGATTC AGGATTC AGGATTC AGGGCTC

  14. Glossary biodiversity – the biological variation represented by different plants and animals genetic diversity – a measure of the possible choices of information provided by a gene Back to slide Back to slide

  15. AAAGTTT GAGATTC AGGATTC AGGATTC AGGGCTC

  16. AAGACTT AAGATTT AGGACTT AAGATTT AGGACTT AAGGTTT AAGATTC AGGACTC AAGGTTT AAGATTC AGGACTC AAAGTTT GAGATTC AGGATTC AGGATTC AGGGCTC DNA Sequence Evolution AAAGTTT GAGATTC AGGATTC AGGATTC AGGGCTC Homoplasy

  17. Seeds of rare crop varieties, cryogenically preserved at the US Department of Agriculture National Seed Storage Laboratory

  18. Growth in human population over the past 2000 years and projected through 2100

  19. A coastal marsh in North Carolina exemplifies an ecosystem with low interspecific diversity

  20. Phenotypic variation in seed color and markings in the common bean (Phaseolusvulgaris) reveals high levels of intraspecific diversity

  21. The cheetah (Acinonyxjubatus)

  22. Change in frequencies over ten generations for two sets of alleles, A/a and B/b, in a theoretical population subject to genetic drift

  23. Increase in inbreeding coefficient (F) in theoretical populations as the population size (N) decreases

  24. The Isle Royale gray wolf (Canis lupus)

  25. The red-cockaded woodpecker (Picoides borealis)

  26. Effects of bottlenecks in various populations on evolutionary potential in Drosophila, as shown by distributions of NaCl {Table Salt} concentrations at extinction

  27. Effect of captive-population founder number on the probability of maintaining both A1 and A2 alleles at a locus

  28. The black-footed ferret (Mustelanigripes)

  29. The Florida panther (Puma concolorcoryi)

  30. Bibliography 1. The following article is a review of conservation of genetics. http://www.sciencedirect.com.library.esc.edu/science?_ob=MImg&_imagekey=B6TCY-4YKKK22-1-5&_cdi=5183&_user=683075&_pii=S016895251000003X&_origin=search&_zone=rslt_list_item&_coverDate=04%2F30%2F2010&_sk=999739995&wchp=dGLzVlb-zSkWb&md5=9d5e6caeb47dee13e1b235a80583303a&ie=/sdarticle.pdf Ouborg, N., Pertoldi, C., Loeschcke, V., Bijlsma, R., & Hedrick, P. (2010). Conservation genetics in transition to conservation genomics . Trends in Genetics, 26(4), 177-187. 2. This article is a review of  the challenges and opportunities faced in conservation genetics from management to breeding systems. http://www.sciencedirect.com.library.esc.edu/science?_ob=MImg&_imagekey=B6V5X-508FKVH-1-2&_cdi=5798&_user=683075&_pii=S000632071000234X&_origin=search&_zone=rslt_list_item&_coverDate=09%2F30%2F2010&_sk=998569990&wchp=dGLzVlb-zSkWb&md5=3b982b4fc9aa31d0367f2aadc8d457c5&ie=/sdarticle.pdf Frankham, R. (2010). Challenges and opportunities of genetic approaches to biological conservation. Biological Conservation, 143(9), 1919-1927.  3. The following website  is about “The AMNH Center for Conservation Genetics (ConGen) employs cutting-edge techniques in genetics, molecular biology, population biology, molecular ecology, and forensics to identify and ameliorate genetic threats to endangered species and to develop and support conservation strategies for retaining genetic diversity.” http://research.amnh.org/genomics/Programs/Conservation-Genetics 4. Conservation Genetics By Kris Hundertmark 5. Essentials of Genetics (7th Edition) ISBN: 0321618696

More Related