Intraguild predation

A guild is a group of organisms that share a common resource in their environment. In the case of

Adalia bipunctata feeds on ladybug eggs even though woolly aphid prey (Eriosoma sp?) are present (lower right corner).

Adalia bipunctata feeds on ladybug eggs even though woolly aphid prey (Eriosoma sp?) are present (lower right corner).

predator guilds, this resource is prey and the members of the guild compete with one another for prey. This shared prey resource can create competitive displacement, a situation where perhaps species A exploits the resource at night and species B during the day. This shared prey resource can also create predator opportunities to engage in intraguild predation, i.e. eating the competition. A simple but effective strategy to reduce competition.

The picture at left was taken April 2012 in the parking lot of a grocery store in Twin Falls, Idaho. I do not know if the adult ladybug is eating  lady bug eggs laid by the same or a different ladybug species. I do know that pictures like this explain why sometimes Kelly has to wait an inordinately long time for me to return a shopping cart to the store.

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7 thoughts on “Intraguild predation

  1. George Sims

    1. Is this Adalia bipunctata? Lost Ladybug project calls it a “rare native”.
    2. Guilds share common resources, eh? Does this mean that you and I are in the Beer Guild?

    Reply
  2. biologistsoup Post author

    Your identification of the ladybug is correct. It is uncommon out here, but they come into my house each fall…
    With regard to the “Beer Guild”: yes we are both in that guild, but that resource isn’t limiting – it is my sincere hope that I will soon be sharing that resource with you! I have never thought of myself as a beer predator…

    Reply
  3. George Sims

    Most everything I see in MY house is Harmonia axyridis, although I also have records of Coccinella septempunctata, Coleomegilla maculata, and Hippodamia convergens, all from the house or immediate environs.

    Reply
  4. biologistsoup Post author

    Yow! Be careful man, ice storms can suck. A house in the woods can be especially scary when the trees get tired of holding up all that ice and need to lie down and rest.

    Reply

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