Ants defend aphids against lethal disease.By Nielsen, C., A.A. Agrawal, and A.E. Hajek.
Biology Letters DOI: 10.1098/rsbl.2009.0743, 2009
Nielsen, C., A.A. Agrawal, and A.E. Hajek. 2009. Ants defend aphids against lethal disease. Biology Letters DOI: 10.1098/rsbl.2009.0743
Social insects defend their own colonies and some species also protect their mutualist partners. In mutualisms with aphids, ants typically feed on honeydew produced by aphids and, in turn guard and shelter aphid colonies from insect natural enemies. Here we report that Formica podzolica
ants tending milkweed aphids, Aphis asclepiadis
, protect aphid colonies from lethal fungal infections caused by an obligate aphid pathogen, Pandora neoaphidis
Light- induced electron transfer and ATP synthesis in a carotene synthesizing insectBy Jean Christophe Valmalette, Aviv Dombrovsky, Pierre Brat, Christian Mertz, Maria Capovilla, Alain Robichon
Scientific Reports, 2012
"A singular adaptive phenotype of a parthenogenetic insect species (Acyrthosiphon pisum) was selected in cold conditions and is characterized by a remarkable apparition of a greenish colour. The aphid pigments involve carotenoid genes well defined in chloroplasts and cyanobacteria and amazingly present in the aphid genome, likely by lateral transfer during evolution. The abundant carotenoid synthesis in aphids suggests strongly that a major and unknown physiological role is related to these compounds beyond their canonical anti-oxidant properties.
Coexistence of three specialist aphids on common milkweed, Asclepias syriaca.By Smith, R.A., K.A. Mooney, A.A. Agrawal.
Ecology. 89(8): 2187-2196., 2008
Smith, R.A., K.A. Mooney, A.A. Agrawal. 2008. Coexistence of three specialist aphids on common milkweed, Asclepias syriaca. Ecology. 89(8): 2187-2196.
Coexistence of host-specific herbivores on plants is believed to be governed by interspecific interactions, but few empirical studies have systematically unraveled these dynamics. We investigated the role of several factors in promoting coexistence among the aphids Aphis nerii, Aphis asclepiadis, and Myzocallis asclepiadis that all specialize on common milkweed (Asclepias syriaca). Competitive exclusion is thought to occur when interspecific competition is stronger than intraspecific competition.