Absolute Population Estimates using Marking Techniques

摘要: Studying plaice and waterfowl populations respectively, Petersen Lincoln independently developed a marking method from which the total population may be estimated (Le Cren, 1965). This was based on principle that if proportion of marked in some way, returned to original then, after complete mixing, second sample taken, number individuals would have same ratio numbers as originally released population. As first three quantities were known latter could easily calculated. has been extensively provides major alternative absolute those count animals within fixed unit habitat; it advantage its accuracy does not depend an assessment sampling units habitat and, already stressed (Chapter 1), is wise practice use more than one simultaneously. There are also certain other methods estimating presence individuals, but different Index. A comprehensive survey these provided by Seber (1973).