| 要旨トップ | 目次 | | 日本生態学会第73回全国大会 (2026年3月、京都) 講演要旨 ESJ73 Abstract

一般講演（口頭発表） L02-08 （Oral presentation）

#### 採餌に失敗したアデリーペンギンは社会的情報を利用して採餌場所を選択する【E】
Unsuccessful foragers select foraging sites relying on social information: evidence from Adélie penguins【E】

*今木俊貴（総合研究大学院大学）, 國分亙彦（総合研究大学院大学, 国立極地研究所）, 高橋晃周（総合研究大学院大学, 国立極地研究所）
*Toshitaka IMAKI（SOKENDAI）, Nobuo KOKUBUN（SOKENDAI, NIPR）, Akinori TAKAHASHI（SOKENDAI, NIPR）

Colonial animals are theoretically expected to use social information to reduce uncertainty regarding food location and quality; however, few empirical studies have investigated how they acquire and when they rely on such information. Here, we tracked 116 breeding Adélie penguins (Pygoscelis adeliae), corresponding to 43% of active breeders in a colony, across 653 foraging trips and examined their movement decisions. We found that foraging site selection was often predicted by individuals’ own previous space use, but in 21.7% of trips, it was better predicted by incorporating the prior space use of conspecifics that departed the colony together. Notably, the simulation with random replacement tests indicated that group departure is a prerequisite for the effects of conspecifics on foraging site selection. Furthermore, penguins with unsuccessful prior trips, quantified as a reduced frequency of foraging dives, changed foraging sites more frequently than those with successful prior trips, relying more on the experiences of conspecifics. These findings suggest that group departure and travel facilitate social information acquisition and use, particularly under unfavourable foraging conditions. Our study presents a potential pathway by which sociality reduces uncertainty about the foraging environment, underscoring the costs of population decline for species that rely on social foraging.

日本生態学会