Abstract Parental provisioning and breeding success of Eurasian Kestrel (Falco tinnunculus) has been widely studied in some continental populations but not in their island-dwelling counterparts. We studied breeding success of kestrels nesting in natural rocky cavities in southern xerophytic scrub of the oceanic island of Tenerife during eight breeding seasons and its relationships with the endemic Gallot's Lizard (Gallotia galloti). We examined lizard provisioning to assess some hypotheses regarding parental provisioning (e.g. central place foraging, parental investment and territory quality). Kestrels nesting in better quality territories (i.e. better habitats for lizards) advanced laying date and increased clutch and brood size at hatching. This did not result in higher number of fledglings. Lizard biomass provided to the chicks did not decrease with increasing nestling age and was correlated positively with the number of nestlings and chick age. These findings support the hypothesis of parental investment. On considering nestling-rearing period in three 10-day phases, we found significantly lower mean mass of lizards delivered in the first phase than in the other two phases together, with no differences between the last two phases. We suggest that kestrels respond to enhance breeding success and fitness keeping a stable number and quality of fledglings.

中文翻译：

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栖息在岛屿干旱环境中的红隼的蜥蜴供应和繁殖成功

摘要 欧亚红隼 (Falco tinnunculus) 的亲本供应和繁殖成功已在一些大陆种群中得到广泛研究，但在岛上居住的同类种群中尚未得到广泛研究。我们研究了在八个繁殖季节在特内里费岛南部旱生灌木的天然岩石洞穴中筑巢的红隼的繁殖成功及其与地方性加洛特蜥蜴 (Gallotia galloti) 的关系。我们检查了蜥蜴供应，以评估有关亲本供应的一些假设（例如中心地点觅食、亲本投资和领土质量）。在质量更好的地区（即蜥蜴更好的栖息地）筑巢的红隼会提前产蛋，并增加孵化时的离合器和育雏尺寸。这并没有导致更多的雏鸟。提供给雏鸡的蜥蜴生物量没有随着雏鸟年龄的增加而减少，并且与雏鸟数量和雏鸡年龄呈正相关。这些发现支持了父母投资的假设。在考虑三个 10 天阶段的雏鸟饲养期时，我们发现第一阶段交付的蜥蜴平均质量明显低于其他两个阶段，最后两个阶段之间没有差异。我们建议红隼做出反应，以提高繁殖成功率和健康度，保持雏鸟数量和质量稳定。我们发现第一阶段交付的蜥蜴平均质量明显低于其他两个阶段，最后两个阶段之间没有差异。我们建议红隼做出反应，以提高繁殖成功率和健康度，保持雏鸟数量和质量稳定。我们发现第一阶段交付的蜥蜴平均质量明显低于其他两个阶段，最后两个阶段之间没有差异。我们建议红隼做出反应，以提高繁殖成功率和健康度，保持雏鸟数量和质量稳定。