Conserving Populations & Species PDF

Ch 7 Conserving Populations and Species https://www.youtube.com/watch?v=Y9iZvsClC10 https://www.fws.gov/Midwest/endangered/insects/ambb/abb_fact.html Section 7.1 Applied Population Biology pp. 210-220 Techniques for learning the status of a population to conserve them....

Ch 7 Conserving Populations and Species https://www.youtube.com/watch?v=Y9iZvsClC10 https://www.fws.gov/Midwest/endangered/insects/ambb/abb_fact.html Section 7.1 Applied Population Biology pp. 210-220 Techniques for learning the status of a population to conserve them. Tracking pop. (declines or increases) Enables protective strategies to be implemented  Monitoring Populations I. Census Count # individuals in pop. Repeat Gives info on whether population is stable, increasing or decreasing. Works on organisms that are relatively easy to track. (A) A Hawaiian monk seal. (B) Censusing seal populations on Green Island of Kure Atoll and on Tern Island of French Frigate Shoals revealed that this species was in danger of extinction Bald Eagle census on the James River 1960’s- 2020’s Where is the James River? Figure 7.4 6 © 2021 Oxford University Press Figure 7.5 7 © 2021 Oxford University Press  Census of orangutans in Borneo Link their # with that of fruiting trees (they eat the fruits) Orangutans are: – Hard to find – Use sleeping platforms instead © 2021 Oxford University Press II. Survey Repeated sampling (sample of indiv) – statistics Extrapolate to population size Lincoln-Peterson index 1) Catch and mark individuals (first time) Let them go 2) Catch a 2nd time 3) How many marked versus unmarked indiv? N= population estimate M = The # of indv. Caught/marked in 1st sample. C = The total # of indv. captured in the 2nd sample. R = The # of indv. in the 2nd sample that are marked. N=MxC R III. Demographic study Follow individuals of known ages Growth rates, survival, reproduction Figure 6.2 Satellite tracking of Magellanic penguins (Spheniscus magellanicus) fitted with radio transmitters shows that penguins incubating eggs forage up to 600 km from their breeding colonies  Conservation Categories pp 229-234 International Union for Conservation of Nature = IUCN https://www.iucnredlist.org/ Fig. 7.15 p 230 © 2021 Oxford University Press TABLE 7.1 Quantification of criteria for Red Red List criteria List category “critically A–E endangered”a A. Observable The population has declined by ≥90% over the last reduction in numbers 10 years or 3 generations (whichever is longer), of individuals either based on direct observation or inferred from factors such as levels of exploitation, threats from introduced species and disease, or habitat destruction or degradation. B. Total geographical The species has a restricted range (