DBPapers
DOI: 10.5593/SGEM2014/B51/S20.050

IMPACT OF DROUGHTS ON INSECT POPULATIONS: A REVIEW

P. Jakubec
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-17-9 / ISSN 1314-2704, June 19-25, 2014, Book 5, Vol. 1, 369-374 pp

ABSTRACT
Climate change is not only linked with increase of mean temperature, but also with
higher probability of the weather extremes like heavy rains, late frosts, heat waves and droughts. It is crucial to understand how these events can influence populations of insects. In this review we provided overview of direct and indirect effects of droughts on insect populations around the world. We studied how droughts are influencing populations (immigration, emigration, growth and population structure) and interactions between different trophic levels (plant/herbivore, herbivore/predator-parasitoid). Special attention is dedicated to interaction of different feeding guilds like foliar feeders and root feeders. We think that most endangered species by droughts are specialized species and species with smaller distribution areas or spatially cornered species (species living on islands, mountains tops and glacial relicts). Size can also play a role in surviving the droughts, because smaller species are more sensitive to higher temperatures (low thermal inertia), but bigger species are losing water much faster through respiration. This could lead to exclusion of both extremes. Empirical studies of local impact of droughts are needed together with local definition of droughts.

Keywords: insect, droughts, weather extremes, climate change