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Southern Giant Petrel Macronectes giganteus Nest Attendance Patterns Under Extreme Weather Conditions

机译：极端天气条件下南部巨海燕Macronectes giganteus巢的出勤模式

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摘要

Differences in nest attendance between genders in seabirds may be related to morphological differences. Southern giant petrel is a dimorphic species with gender-specific foraging behavior. The objective of this study was to investigate sex-related differences in nest attendance during the breeding period of southern giant petrels by presence/absence patterns of both sexes during incubation and compare use of the colony after nest failure. Fourteen birds were tagged with digitally coded radio-transmitters in a colony at Elephant Island, Antarctica, in the beginning of 2009/2010 breeding season. Females were present during 18 periods (min. 3 days, max. 9 days) and males only in five periods (min. 2 days, max. 13 days). The difference in mean number of radio signals per day between females (4330; s.e. 313.5) and males (2691; s.e. 248.6) was highly significant (t = 4.3; d.f. = 199; P < 0.001; Fig. 4). As consequence of the severe weather conditions that year, all tagged birds failed to reproduce. After abandonment of the nests, the presence of both genders decreased drastically, although the tagged individuals stayed in the area. Under severe weather conditions female Southern Giant Petrels continue breeding while males abandon the nest earlier.
机译：海鸟中性别之间的巢穴出勤率差异可能与形态差异有关。南方海燕是具有性别特异性觅食行为的双态物种。这项研究的目的是通过在孵化过程中两种性别的存在/不存在模式来调查南方巨型海燕繁殖期的出勤率与性别相关的差异，并比较巢失败后的菌落使用情况。在2009/2010繁殖季节开始时，在南极洲象岛的一个殖民地中，用数字编码的无线电发射器标记了十四只鸟。女性出现在18个时期（最少3天，最多9天），男性只出现了五个时期（最小2天，最多13天）。女性（4330; s.e .. 313.5）和男性（2691; s.e. 248.6）之间每天平均无线电信号数量的差异非常显着（t = 4.3; d.f. = 199; P <0.001;图4）。由于当年恶劣的天气条件，所有带标签的鸟类均无法繁殖。遗弃巢穴后，尽管被标记的人留在该地区，但两种性别的存在都急剧减少。在恶劣的天气条件下，雌性南方巨海燕继续繁殖，而雄性则更早放弃巢穴。

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