Study: Rain forest insects eat no more tree species than temperate counterparts

August 23, 2006

A study initiated by University of Minnesota plant biologist George Weiblen has confirmed what biologists since Darwin have suspected - that the vast number of tree species in rain forests accounts for the equally vast number of plant-eating species of insects.

"This is a big step forward in the quest to understand why there is so much biodiversity in the tropics," said Weiblen, principal investigator and senior author for the National Science Foundation-funded research. The study is published in the Aug. 25 issue of the journal Science.

The research showed that insect species in tropical and temperate forests dine on about the same number of tree species, despite the more diverse menu in the tropics.

"The tropical forest cafeteria offers many more options than the temperate forest," Weiblen said. "Our study confirms that the choices tropical insects make are quite similar to those of insects in less diverse forests of places like Minnesota."

The study rejected an alternative theory that tropical insects are actually picky eaters who prefer fewer host plants than their temperate counterparts.

"Theory predicts that similar species coexist by dividing up resources like food and space," Weiblen said. "The unparalleled diversity of plant-eating insects in the tropics could be explained according to this theory if tropical insects were more choosy than those in temperate forests. But it hasn't been possible to compare what's on the menu until now."

Identical experiments on tropical and temperate insects were unknown until Weiblen developed a technique to control for differences in food plant diversity.

"It turns out that insect appetites aren't all that different near the equator but the tropical smorgasbord brings more species to the table," Weiblen says.
-end-
The study was carried out in Papua New Guinea and the Czech Republic by scientists from the University of South Bohemia, the Smithsonian's National Museum of Natural History, National Zoological Park, Tropical Research Institute, Comenius University in Slovakia as well as the University of Minnesota.

The researchers, led by Vojtech Novotny of the University of South Bohemia in the Czech Republic, collected insect species feeding on 22 tree species at the Czech and Slovak sites and 22 species in Papua New Guinea. In all, some 850 insect species were recorded.

The study was funded by the U.S. National Science Foundation, the U. S. National Institutes of Health, the Czech Grant Agency, the Czech Academy of Sciences, the Czech Ministry of Education, the National Geographic Society, the Darwin Initiative and the Slovak Grant Agency.

University of Minnesota

Related Insects Articles from Brightsurf:

High temperatures threaten the survival of insects
Insects have difficulties handling the higher temperatures brought on by climate change, and might risk overheating.

Food allergy caused by insects?
Can edible insects trigger allergies? In September 2020, the BfR launched a new joint research project to protect consumers from potential allergic reactions: Allergen-Pro.

A robot to track and film flying insects
French scientists have developed the first cable-driven robot that can follow and interact with free-flying insects.

Dramatic loss of food plants for insects
Just a few weeks ago, everyone was talking about plummeting insect numbers.

The brains of shrimps and insects are more alike than we thought
Crustaceans share a brain structure known to be crucial for learning and memory in insects, a University of Arizona-led research team discovered.

Freshwater insects recover while spiders decline in UK
Many insects, mosses and lichens in the UK are bucking the trend of biodiversity loss, according to a comprehensive analysis of over 5,000 species led by UCL and the UK Centre for Ecology & Hydrology (UKCEH), and published in Nature Ecology & Evolution.

Hundreds of novel viruses discovered in insects
New viruses which cause diseases often come from animals. Well-known examples of this are the Zika virus transmitted by mosquitoes, bird flu viruses, as well as the MERS virus which is associated with camels.

Tiny insects become 'visible' to bats when they swarm
Small insects that would normally be undetectable to bats using echolocation suddenly become detectable when they occur in large swarms.

Helpful insects and landscape changes
We might not notice them, but the crops farmers grow are protected by scores of tiny invertebrate bodyguards.

New information on tropical parasitoid insects revealed
The diversity and ecology of African parasitoid wasps was studied for over a year during a project run by the Biodiversity Unit of the University of Turku in Finland.

Read More: Insects News and Insects Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.