Helpers increase food abundance in the territory of a cooperatively breeding fish

Tanaka, Hirokazu; Frommen, Joachim Gerhard; Kohda, Masanori (2018). Helpers increase food abundance in the territory of a cooperatively breeding fish. Behavioral ecology and sociobiology, 72(3) Springer-Verlag 10.1007/s00265-018-2450-5

Preview

Text Tanaka2018_Article_HelpersIncreaseFoodAbundanceIn.pdf - Published Version Available under License Publisher holds Copyright. Download (594kB) | Preview

In cooperatively breeding or eusocial animals, increasing resources such as food is a major task of brood care helpers or workers. While such food acquisition has been shown in several animal taxa, evidence is absent in fishes. Here, we provide the first evidence of increased food abundance caused by helpers in a cooperatively breeding fish. Helpers of the cichlid Neolamprologus obscurus excavate cavities by digging sand from under stones, which serve as shelter for the group members. We test whether these cavities additionally increase the abundance of benthic invertebrates in the territory. Stomach content analyses of wild-caught fish revealed that benthic invertebrates pose the main food resource of N. obscurus. Experimental assessments of daily benthic invertebrate immigration into artificial cavities demonstrate a significant increase in invertebrate prey abundance according to the size of the excavated stone area. Finally, by applying correlational and experimental approaches in the field, we show that helpers play a crucial role in the maintenance of the excavated cavities. In combination, these results demonstrate that helpers increase the abundance of benthic invertebrates inside the territory of breeders in N. obscurus. Our results provide the first evidence of increased food abundance through helpers in fishes. Such foraging system may resemble those described in other species living in highly social groups, and appears to be a ubiquitous mechanism underpinning the maintenance of complex societies in animals.

Interest & Impact

Downloads

62 since deposited on 07 May 2019
34 in the past 12 months

Citations

5 Citations in Web of Science ®
6 Citations in Scopus

Search

in Google Scholar™

Services

Actions (login required)

Edit item

Actions (login required)

Edit item