From Pop. Dynamics - Conservation Strats OneNote Extra Bits

Assumptions Made w/ capture-recapture method

• Population is closed

• Do not lose their tags, nor do the tags cause a survival disadvantage.

• no tagged animals die

• All animals are likely to be recaptured eg male vs female, old vs young.

• Tagged animals are able to randomly disperse into their populations again. → Not ostracized cause of the tags

• Animals are not trap happy nor trap shy.

Same as Before But Reliable and Valid?

• Neither trap happy nor trap shy

• Tagging method doesn’t cause deaths or changes in behaviour

• No emigration and no immigration

• No increase in natality.

Trap Happy and Trap Shy Animals?

Trap happy: Animals that like to be trapped, knowing there will be a food reward.

Trap shy: Animals that have been traumatised/scared by the trap. So they learn to avoid it.

Trap happy effect on Pop. estimation

Underestimates in the data.

Trap shy effect on Pop. estimation

Overestimates in the data

Primary Productivity and Biodiversity Diff In both Successions:

Primary:

• A new area with no life; barren

• Soil not yet formed

• Pioneer plants i.e. lichen

• Lower Product. due to fewer plants (biomass or energy)

• Low B.D. for a long time

Secondary:

• Begins w/ disturbance of already established ecosystem

• soil present and some plants and animals as well.

• seeds and roots of vegetation present

• Higher Product. due to more plants and faster regrowth

• faster development of wider B.D.