. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 548 M. Molina Borja Jennrich & Turner (1969) gave a method to correct the polygon technique for sample size bias, that is to say, the influence of the number of captures or recor- dings on the estimated home range. However, this correction has not been done in our case because no observational studies of spatial behaviour were conside- red in their paper. The applicability of that method to cases of direct observa- tional studies, such as ours, has not been trea
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 548 M. Molina Borja Jennrich & Turner (1969) gave a method to correct the polygon technique for sample size bias, that is to say, the influence of the number of captures or recor- dings on the estimated home range. However, this correction has not been done in our case because no observational studies of spatial behaviour were conside- red in their paper. The applicability of that method to cases of direct observa- tional studies, such as ours, has not been treated in the literature. Thus, for exam- ple, the presence of a lizard may have been recorded up to a maximum of 73 different times (see Table I) during our study, and such figures are not very usual in capture techniques. The direct observation method used in the present study gives more informa- tion about the every-day lizard movements than the classical one based on cap- ture points, and there are other advantages which have already been mentioned (Mackay 1975). Therefore, apart from some possible error due to the lack of good visibility, in establishing some of the home range outermost points, the estimation of the whole home area appears to be more accurate in our case. However, the fact that the different lizard home areas were obtained from data over a different number of days must be taken into account; this varied day number being due to the variability of the visibility of the several representative lizards on different days. The overlapping of lizard home ranges has been shown for the whole recor- ding period but it also occurs in considering a single day (Fig. 9 a and b). Thus a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zoologisches Forschungsinstitut und Museum Alexander Koenig. Bonn : Da
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