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首页> 外文期刊>Ostrich >Breeding biology of the common Kestrel in southern Africa (32 deg S) compared to studies in Europe (53 deg N)
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Breeding biology of the common Kestrel in southern Africa (32 deg S) compared to studies in Europe (53 deg N)

机译：南部非洲（32 deg S）的普通茶est的繁殖生物学与欧洲（53 deg N）的研究相比

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摘要

The breeding biology of 24 pairs of Southern African Kestrels Falco tinnunculus rupicolus was studied over two seasons in the Tarkastad District (32 deg S), South Africa, and compared to studies of the western European Kestrel Falco tinnunculus tinnunculus (53 deg N). Most Southern African Kestrels bred in old stick nests and on cliffs at densities comparable with average densities of European Kestrels (24.3 pairs. 100 km~(-2) vs. 12 - 32 pairs. 100 km~(-2)). Mean clutch size was smaller than found in Europe (3.21 eggs vs. 4.4 eggs) while incubation period at one nest was 26 days and within the range of the European Kestrel (26 - 31 days). Nestling (30-31 days) and post-fledging periods (32-39 days) were also similar to the range rccortlcd for the European Kestrel (27-35 days and 13-31 days respectively). The number of chicks fledged was inversely related to laying date, as in Europe. Provisioning rates to nestlings were higher than in Europe (57.4 items.nest~(-1) vs. 13 - 19.2 items.nest~(-1)), but the estimated size and amount of food delivered to the nest per day was lower (151.8 g.nest~(-1) vs. 325 g.nest~(-1)). Chick growth rates were within the range measured for European Kestrel chicks (Ricklef's growth rate constant K = 0.257 vs. K = 0. 166 - 0.312) but wing feather-growth rate was marginally lower. Only clutch size fitted predictions of life-history theory over latitudinal gradients although more data is needed on other life-history parameters. I suggest that environmental variation resulting in differences in food availability and food quality are responsible for latitudinal trends in life-history traits.
机译：在南非的塔卡斯塔德地区（南纬32度）进行了两个季节的研究，研究了24对南部非洲Kestrels Falco tinnunculus rupicolus的繁殖生物学，并将其与西欧红茶F（Nestrel Falco tinnunculus tinnunculus）（53 deg）进行了比较。多数南部非洲龙虾在老枝巢和悬崖上繁殖，密度与欧洲龙虾的平均密度相当（24.3对。100km〜（-2）对12-32对。100km〜（-2））。平均离合器的大小小于欧洲（3.21卵对4.4卵），而在一个巢中的孵化期为26天，处于欧洲红K的范围内（26-31天）。雏鸟的孵化期（30-31天）和出雏期（32-39天）也与欧洲红est的繁殖期（分别为27-35天和13-31天）相似。像欧洲一样，雏鸡的数量与产蛋日期成反比。雏鸟的供应率高于欧洲（57.4项巢（-1）对13-19.2项巢（-1）），但估计每天运送到巢中的食物的大小和数量较低（151.8 g.nest〜（-1）与325 g.nest〜（-1））。小鸡的生长速度在欧洲红est小鸡的测量范围内（Ricklef的生长速度常数K = 0.257 vs. K = 0. 166-0.312），但翼羽的生长速度略低。尽管在其他寿命历史参数上需要更多数据，但只有离合器尺寸适合寿命历史理论对纬度梯度的预测。我建议，导致食物可获得性和食物质量差异的环境变化是生活史特征的纬度趋势的原因。

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  • 来源
    《Ostrich》 |1999年第2期|共6页
  • 作者

    A. J. Van Zyl;

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  • 正文语种 eng
  • 中图分类 鸟纲;
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