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Morphometrics and field estimation of the size of the Nile crocodile
Author(s) -
HUTTON J. M.
Publication year - 1987
Publication title -
african journal of ecology
Language(s) - French
Resource type - Journals
SCImago Journal Rank - 0.499
H-Index - 54
eISSN - 1365-2028
pISSN - 0141-6707
DOI - 10.1111/j.1365-2028.1987.tb01113.x
Subject(s) - humanities , forestry , geography , population , mathematics , art , demography , sociology
Summary A number of measurements were taken of 104 crocodiles at Ngezi, Zimbabwe. These were used to define the relationship between total length and eight other parameters, particularly those that are associated with size estimation during population surveys. The commonly used ratio between hindfoot (HF) spoor and total length is adjusted to 1:14 where HF <150mm, and 1:13.5 where HF > 150 mm. The accuracy of a ratio of 1:7 between head length and total length, used mostly during night counts, is established. Preliminary work suggests that these results are applicable to other populations. RÉSUMEÉ Un nombre de mensurations ont été relevées sur 104 crocodiles à Ngezi (Zimbabwe). Celles‐ci ont servi àétablir la relation existant entre la longueur totale et huit autres paramètres, particulièrement ceux qui sont liés a revolution de la taille durant les recensements de population. L'indice habituellement utilisé entre l'empreinte de la patte arrière (HF) et la longueur totale ajustéà 1: 14 quand HF < 150 mm et à 1: 13,5 quand HF < 150 mm. On établit un indice de 1: 7 entre la longueur de la těte et la longueur totale, en usage lors des comptages nocturnes. Un travail préliminaire suggère que ces résultats sont aussi applicables a d'autres populations.