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- Title
Failure to estimate reliable sex ratios of guanaco from road-survey data.
- Authors
Pedrana, Julieta; Rodríguez, Alejandro; Bustamante, Javier; Travaini, Alejandro; Martínez, Juan I. Zanón
- Abstract
The guanaco (Lama guanicoe (Müller, 1776)) is a monomorphic polygynous mammal whose adult sex ratio is expected to be balanced or biased towards females. Remarkably male-biased sex ratios of adult guanacos are often estimated from road surveys. We analyzed the distribution of guanaco social groups recorded during road surveys in Patagonia, Argentina, to test the hypothesis that group assignation based upon behavioral traits is not unequivocal and can be biased by survey factors. Guanacos are organized into three social units (family groups, male groups, and solitary males) that are identified by their grouping behaviour. We recorded 992 guanaco groups, and estimated an adult sex ratio of 3.2 males/female. We used generalized additive models to test the null hypothesis that the probability of recording a group as a family group was constant. Alternatively, this probability could decrease when juvenile abundance and (or) detectability was low. The most parsimonious model showed that the probability of classifying a “family” group increased with date, and decreased with group size, distance to the observer, and time of day. Our results do not support the null hypothesis and suggest that road surveys are unsuitable to estimate reliably the social structure or sex ratio of guanaco populations.
- Subjects
PATAGONIA (Argentina &; Chile); ARGENTINA; GUANACO; ANIMAL offspring sex ratio; ROAD surveying; ANIMAL behavior; ANIMAL populations; PARSIMONIOUS models; ANIMAL classification
- Publication
Canadian Journal of Zoology, 2009, Vol 87, Issue 10, p886
- ISSN
0008-4301
- Publication type
Article
- DOI
10.1139/Z09-079