1.2 Investigating populations 0.0 / 5 ? BiologyEcology, ecosystems and environmental biologyA2/A-levelAQA Created by: Isabel CookeCreated on: 23-01-14 20:52 The number of individuals of a species in a given space Abundance 1 of 7 Sampling device used for transitionary populations Point quadrat 2 of 7 Type of sampling used with point quadrats Systematic sampling 3 of 7 Why does sampling (normally) need to be random? To avoid bias in collecting data, so the data is valid 4 of 7 Mark-release-recapture equation pop size = no. 1st sample, times no. 2nd sample, divided by no. marked individuals recaptured 5 of 7 Why are mark-release-recapture techniques used? As animals usually are mobile and move away when approached, and hard to find. 6 of 7 How reduce impact of fieldwork on a community? Study in situ, return all study subjects immediately, time between studies, reduce damage to habitat. 7 of 7
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