In the Antarctic Peninsula, during the chick-rearing period Adélie (Pygoscelis adeliae) and gentoo (P. papua) penguins feed primarily on Antarctic krill (Euphausia superba), which is also exploited by the commercial fishery. Krill length and proportion of juvenile krill consumed by these predators that breed at Stranger Point, South Shetland Islands (from 2007/2008 to 2015/2016), and those collected by the krill fishery in the Mar de la Flota/Bransfield Strait (from 2009/2010 to 2015/2016) were compared to evaluate the potential of each data source as an indicator of changes in the size composition and so, in the demographic structure of the krill population. Overall, the mean krill size taken by gentoo penguins was larger than that ingested by Adélie penguins, which consumed higher proportions of juvenile (≤ 35 mm) and one-year-old (≤ 25 mm) krill. Although the krill size caught by the fishery was statistically similar to that taken by both penguin species, there were differences in the frequency distributions of krill size among the three databases. Furthermore, when only adult krill (> 35 mm) was considered, the three sources of krill data showed a similar inter-annual variation in the availability of adult krill cohorts. Our findings suggest that each database analysed here can potentially provide different information (although complementary) about krill size composition. In addition, inter-annual fluctuations in the smaller size classes of krill likely reflect their first year of recruitment and, therefore, may be used as an indicator of shifts in local krill availability.

在南极半岛，小鸡饲养期间，Adélie（Pygoscelis adeliae）和gentoo（P. papua）企鹅主要以南极磷虾（Euphausia superba）为食），也被商业性渔业利用。这些捕食者的磷虾长度和比例，这些捕食者在南设得兰群岛的陌生人点繁殖（2007/2008年至2015/2016年），以及在Mar de la Flota / Bransfield海峡的磷虾渔业收集的磷虾（2009年以来） / 2010年至2015/2016年）进行了比较，以评估每个数据源作为磷虾种群的人口结构变化等指标的潜力。总体而言，金戈企鹅的平均磷虾尺寸大于阿德利企鹅摄入的磷虾，后者消耗的幼鱼（≤35毫米）和一岁（≤25毫米）磷虾比例更高。尽管渔业捕捞的磷虾大小在统计学上与两种企鹅都相同，在这三个数据库中，磷虾尺寸的频率分布存在差异。此外，当仅考虑成年磷虾（> 35 mm）时，磷虾数据的三个来源显示成年磷虾队列的可用性存在类似的年际变化。我们的发现表明，这里分析的每个数据库都可能提供有关磷虾大小组成的不同信息（尽管是互补的）。此外，较小型磷虾类别的年际波动可能反映了其第一年的招募，因此可以用作当地磷虾供应量变化的指标。我们的发现表明，这里分析的每个数据库都可能提供有关磷虾大小组成的不同信息（尽管是互补的）。此外，较小型磷虾类别的年际波动可能反映了其第一年的招募，因此可以用作当地磷虾供应量变化的指标。我们的发现表明，这里分析的每个数据库都可能提供有关磷虾大小组成的不同信息（尽管是互补的）。此外，较小型磷虾类别的年际波动可能反映了其第一年的招募，因此可以用作当地磷虾供应量变化的指标。