Jordi, Olga <br/><br/>
Sex differences in growth rates of Yellow-legged Gull Larus michahellis chicks / 
Jordi, O., Arizaga, J. 
 -- [S.l.]:   British Trust for Ornithology,   5/2016. 
<br/><br/> Restringido 
<br/><br/> ABSTRACT<br/>Capsule: Chick growth rates was sex-dependent in an Atlantic Yellow-legged Gull Larus michahellis population.<br/>Aims: To describe the growth rate of Yellow-legged Gull chicks and sex-associated variations, and obtain a discriminant function to sex them using morphological data.<br/>Methods: Fifty-two Yellow-legged Gull chicks from a colony in northern Iberia were measured for body mass, head and bill length, tarsus length and three other bill-length associated variables, from the hatching date up to the age of 36 days. Birds were sexed using DNA analysis.<br/>Results: Using logistic models, chick growth rates was observed to be similar between the sexes, while the asymptote was higher among males for the majority of the variables. Discriminant<br/>analyses showed that the variable head+bill was very reliable to predict the sex of >80% of chicks at an early developmental stage, and 100% of chicks if combined with tarsus length and<br/>two more bill-length associated variables at the age of 35 days.<br/>Conclusions: This is the first study using a discriminant analysis to sex Yellow-legged Gull chicks,<br/>and also the first to describe the growth function for the species. The growth rate varied<br/>between sexes because males showed higher asymptote values within the growth function. 
<br/><br/>Jordi, O., Arizaga, J. 2016. Sex differences in growth rates of Yellow-legged Gull Larus michahellis chicks. Bird Study 63(2): 273–278.278. http:/doi.org/10.1080/00063657.2016.1182966. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Body mass<br/>body size<br/>Discriminant Analyses<br/>sexual dimorphism
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Artículo científico