Crop size as an index of chick provisioning in the Greater Flamingo Phoenicopterus roseus

被引:6
|
作者
Rendon, Miguel A. [1 ]
Garrido, Araceli [2 ]
Guerrero, Jose C. [3 ]
Rendon-Martos, Manuel [4 ]
Amat, Juan A. [1 ]
机构
[1] EBD CSIC, Dept Wetland Ecol, Seville 41092, Spain
[2] Agencia Medio Ambiente & Agua de Andalucia, Programa Actuac Conservac Aves Acuat Andalucia, Malaga 29004, Spain
[3] IECA, LDSGAT, Montevideo 11400, Uruguay
[4] Consejeria Medio Ambiente, Fuente De Piedra 29520, Spain
关键词
body condition; digestion rate; feeding frequency; meal size; mixed models; MANX SHEARWATERS; MOURNING DOVES; BODY CONDITION; BILL MORPHS; BEHAVIOR; VARIABILITY; LIMITATION; STRATEGIES; CLUTCH; DIET;
D O I
10.1111/j.1474-919X.2012.01218.x
中图分类号
Q95 [动物学];
学科分类号
071002 ;
摘要
After being fed by their parents, Greater Flamingo chicks store food in their crops, which protrude outwards. We allocated the crop profiles of chicks to four categories to assess the relationship between body mass and crop profile variation, and so determine whether crop size can be used as an accurate index of the amount of food ingested, and to determine the timing and frequency of provisioning. We registered changes in body mass and crop fullness in eight chicks captured with turgid crops and kept in captivity until constant mass was achieved. The meal mass ingested by the chicks during each parental feeding was around 18% of net chick mass and varied greatly with crop profile. Mean transition times between the four crop profile categories ranged from 6 to 14 h. Between 1998 and 2009, 34% of chicks caught for ringing in a breeding colony had empty crops. From crop profiles recorded during the handling of chicks, it was estimated that approximately one-third of the chicks were fed in the evening and another third during the night. Our results have implications for the estimation of body condition indexes because body mass should be free of the influence of the mass of the food in the crop.
引用
收藏
页码:379 / 388
页数:10
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