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Does social feeding improve larval survival of the two-spotted lady beetle, Adalia bipunctata? | LitMetric

AI Article Synopsis

  • Lady beetle larvae benefit from emerging in groups, as they can share food when one captures an aphid, which may help prevent starvation.
  • Research showed that two-spotted lady beetle larvae are attracted to pheromones from damaged aphids, leading to experiments on their prey capture and survival rates in varying group sizes.
  • Despite increased rates of food capture with larger groups, the experiments revealed that the initial density of lady beetle hatchlings did not significantly impact their overall survival.

Article Abstract

Lady beetles typically lay eggs in clusters, and clutch-mates that emerge near to each other might benefit in multiple ways. For example, lady beetle larvae are attracted to the pheromone released by aphids under attack. Thus, one potential advantage to larvae emerging as a group is if one larva captures an aphid, others can share in consuming the same aphid. Sharing a meal likely reduces the per capita food intake of a hatchling, but it might also provide enough nutrition to prevent death by starvation during a particularly vulnerable stage. In an assay of the behavior of two-spotted lady beetles (Adalia bipunctata), larvae were attracted to chemical cues from damaged aphids, corroborating previous research. Densities of A. bipunctata hatchlings were then manipulated to test whether the presence of clutch-mates increasesed the probability of capturing prey, and the survivorship of hatchlings. In one experiment, a single aphid was placed with a number of lady beetle hatchlings ranging from 1 to 10 in a small arena for 72 hours to evaluate prey capture effectiveness and hatchling survival. As the initial density of lady beetle hatchlings increased, their prey capture rate increased. At the same time, survival of the hatchlings was not affected by their initial density. Five experiments were performed on individual fava bean plants by varying densities of aphids and lady beetle hatchlings to evaluate lady beetle survivorship measured after five days. In all five on-plant experiments, increasing the initial number of lady beetle larvae did not improve their survival. Lady beetle larvae shared meals during the small scale experiments, but that behavior did not improve their survivorship under any of the experimental conditions.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3605032PMC
http://dx.doi.org/10.1673/031.012.10101DOI Listing

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