Provide information for conservation forest reserve and management of national parks. To be able to value wild life resources and design/alter boundaries of various conservational areas. Differentiate between sample count and total count Give five factors to be considered before carrying out a counting exercise. Natural vegetation Size of organisms to be counted\ Behavior/social structure/activity of the organism to be counted Nature of the habitat: aquatic or terrestrial Available resources e.g. apparatus, transport, camera, money. Describe a suitable method you would use to estimate the population of Fish e.g. tilapia in a lake Capture-mark-release recapture/ Lincoln index method Gill netting Reason Because fish is large in size and can easily be identified and capture and counted. Lincoln index method No fish are gill-netted and after their operculum tagged with an inconspicuous aluminium discs and then released back into the water without harming them. N1 N2 After some tome fish is netted again, and fish found marked. The population of fish N in a lake is then estimated from Flying insects in an open woodland. Removal method Reason They are small and mobile Using a net, in form of a sweep net, the number of insect captured is recorded. This procedure is repeated a further three times and gradually reducing numbers are recorded. A graph of number of insects per sample against the previous cumulative number of insect is plotted By extra plotting the line of the graph to the point at which no further animals would be captured, the total population of insects is determined. 21 1998/2/1 A study was carried out on a plant of two species of Lemna duckweed. In one experiment they were cultured separately, in another together. Two growth curves were sketched for both experiments. Study the graphs and answer the questions
Provide information for conservation forest reserve and management of national parks. To be able to value wild life resources and design/alter boundaries of various conservational areas. Differentiate between sample count and total count Give five factors to be considered before carrying out a counting exercise. Natural vegetation Size of organisms to be counted\ Behavior/social structure/activity of the organism to be counted Nature of the habitat: aquatic or terrestrial Available resources e.g. apparatus, transport, camera, money. Describe a suitable method you would use to estimate the population of Fish e.g. tilapia in a lake Capture-mark-release recapture/ Lincoln index method Gill netting Reason Because fish is large in size and can easily be identified and capture and counted. Lincoln index method No fish are gill-netted and after their operculum tagged with an inconspicuous aluminium discs and then released back into the water without harming them. After some tome N1 fish is netted again, and N2 fish found marked. The population of fish N in a lake is then estimated from Flying insects in an open woodland. Removal method Reason They are small and mobile Using a net, in form of a sweep net, the number of insect captured is recorded. This procedure is repeated a further three times and gradually reducing numbers are recorded. A graph of number of insects per sample against the previous cumulative number of insect is plotted By extra plotting the line of the graph to the point at which no further animals would be captured, the total population of insects is determined. 21 1998/2/1 A study was carried out on a plant of two species of Lemna duckweed. In one experiment they were cultured separately, in another together. Two growth curves were sketched for both experiments. Study the graphs and answer the questions
Ecology-questions-and-answer.docx