Study

Effects of a biological control introduction on three nontarget native species of Saturniid moths

  • Published source details Boettner G.H., Elkinton J.S. & Boettner C.J. (2000) Effects of a biological control introduction on three nontarget native species of Saturniid moths. Conservation Biology, 14, 1798-1806.

Summary

The nontarget effects of a generalist parasitoid fly, Compsilura concinnata (Diptera: Tachinidae), introduced repeatedly to North America from 1906 to 1986 as a biological control agent against 13 pest species was experimentally examined, focusing primarily on two native, nontarget silk moths (Saturniidae), Hyalophora cecropia and Callosamia promethea in a Massachusetts forest (for a summary see: www.conservationevidence.com/ViewEntry.asp?ID=996). An additional small scale study, summarised here, of Hemileuca maia maia (a threatened native species) to investigate potential parasitism by C.concinnata was also undertaken.

Field-collected H.maia maia reared for C.concinnata: In 1998, a wild egg mass of H.maia maia, a state-listed (threatened) saturniid moth, was located on Otis Air National Guard Base, Cape Cod, Massachusetts (41˚39'N, 70˚34'W), northeast USA. Approximately 200 larvae hatched and fed gregariously on a bear oak Quercus ilicifolia. The larvae remained within a 20 m radius of the tree for the first three instars. A steep decline in numbers of the larval aggregation was observed during the third instar, so on 23 June 1998, 50 of the approximately 100 survivors were collected and reared in the laboratory to monitor for parasitoids.

It was found that C.concinnata parasitism was responsible for 36% (n = 50) mortality in the third instar Hemileuca maia maia larvae. Parasitism by this parasitoid fly may have also been implicated in the steep decline of this single larval aggregation observed in the field.

Thus, in terms of a management intervention to control insect pest species in forests, whilst C.concinnata has been effective at controlling several pest species, this introduced parasatoid fy may also be endangering native, nontarget insects, especially some silk moth species.


Note: If using or referring to this published study, please read and quote the original paper, this can be viewed at:

http://www.blackwell-synergy.com/doi/full/10.1046/j.1523-1739.2000.99193.x

 

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 20

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.


Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Bat Conservation InternationalPeople trust for endangered speciesVincet Wildlife Trust