Crowded locusts produce hatchlings vulnerable to fungal attack.
Transgenerational effects of parental experience on offspring immunity are well documented in the vertebrate literature (where antibodies play an obligatory role), but have only recently been described in invertebrates. We have assessed the impact of parental rearing density upon offspring disease resistance by challenging day-old locust hatchlings (Schistocerca gregaria) from either crowd- or solitary-reared parents with the fungal pathogen Metarhizium anisopliae var. acridum. When immersed in standardized conidia suspensions, hatchlings from gregarious parents suffered greater pathogen-induced mortality than hatchlings from solitary-reared parents. This observation contradicts the basic theory of positive density-dependent prophylaxis and demonstrates that crowding has a transgenerational influence upon locust disease resistance.
Miller
Gabriel A
GA
School of Biological Sciences, The University of Sydney, Heydon-Laurence Building A08, New South Wales 2006, Australia. gmiller@oeb.harvard.edu
Pell
Judith K
JK
Simpson
Stephen J
SJ
D000818:Animals; D005260:Female; D006110:Grasshoppers / Q000276:immunology* / Q000382:microbiology*; D054884:Host-Pathogen Interactions; D008297:Male; D018811:Maternal Exposure; D052981:Metarhizium / Q000502:physiology*; D018812:Paternal Exposure; D011156:Population Density
J Insect Physiol. 2008 Mar;54(3):612-8
18249411
Curr Biol. 2003 Mar 18;13(6):489-92
12646131
Proc Biol Sci. 2006 Jun 7;273(1592):1399-405
16777729
Proc Natl Acad Sci U S A. 2002 Apr 16;99(8):5471-5
11960003
Trends Ecol Evol. 2001 Jun 1;16(6):295-300
11369107
Curr Biol. 2009 Jan 13;19(1):20-4
19097898
Curr Biol. 2009 Jan 13;19(1):R21-3
19138584
Proc Biol Sci. 2003 Nov 22;270(1531):2309-19
14667346
Curr Biol. 2007 Dec 18;17(24):R1046-7
18088585
J Exp Biol. 2008 Feb;211(Pt 3):370-6
18203992
Biol Lett. 2005 Dec 22;1(4):386-8
17148213
J Insect Physiol. 1998 May;44(5-6):365-377
12770154