title: Interactions of the Asian Lady Beetle, Harmonia axyridis (Coleoptera: Coccinellidae), and the North American Native Lady Beetle, Coccinella novemnotata (Coleoptera: Coccinellidae): Prospects for Recovery Post-Decline.
abstract: The decline of the North American native lady beetle, Coccinella novemnotata Herbst, is strongly correlated with the introduction of Coccinella septempunctata L., and C. novemnotata are locally extirpated across much of the United States. Since C. novemnotata's decline, the invasive Harmonia axyridis Pallas has become dominant in North America. This study investigated whether H. axyridis has the potential to impede the recovery of C. novemnotata populations. To determine how H. axyridis interacts with C. novemnotata via intraguild predation and competition for prey, we paired first-instar C. novemnotata with first-instar H. axyridis at low and high densities of pea aphid. Coccinella novemnotata survival when paired interspecifically was significantly lower than H. axyridis survival at both aphid densities. Both species had similar weights at eclosion across aphid densities; however, H. axyridis developed faster than C. novemnotata. To examine the effect of larval size on intraguild interactions, we conducted a second experiment where we varied the C. novemnotata and H. axyridis instar in our pairings. Coccinella novemnotata survival and final weight increased when paired with younger H. axyridis larvae. The percentage survival of C. novemnotata in interspecific treatments, at the low aphid density, was lower than for same-aged C. novemnotata reared conspecifically, except for pairs initiated with C. novemnotata larvae that were two instars more advanced than H. axyridis larvae. These results suggest that intraguild predation and competition for prey by H. axyridis have the potential to affect the recovery of C. novemnotata populations negatively.
authors.affiliation: Department of Agronomy, Federal University of Fronteira Sul (UFFS), Rod. SC 484 Km 02, Bairro Fronteira Sul, Chapecó, SC 89801-001, Brazil (rafaelducatti1007@gmail.com).|Department of Entomology, Cornell University, 169 Helios Circle, Ithaca, NY 14853-2601 (tau2@cornell.edu; jel27@cornell.edu).
authors.forename: Rafael Dal Bosco
authors.initials: RD
authors.lastname: Ducatti
authors.affiliation: Department of Entomology, Cornell University, 169 Helios Circle, Ithaca, NY 14853-2601 (tau2@cornell.edu; jel27@cornell.edu).
authors.forename: Todd A
authors.initials: TA
authors.lastname: Ugine
authors.affiliation: Department of Entomology, Cornell University, 169 Helios Circle, Ithaca, NY 14853-2601 (tau2@cornell.edu; jel27@cornell.edu).
authors.forename: John
authors.initials: J
authors.lastname: Losey
mesh_terms: D000818:Animals; D001517:Coleoptera / Q000254:growth & development / Q000502:physiology*; D003163:Competitive Behavior; D005260:Female; D058865:Introduced Species; D007814:Larva / Q000254:growth & development / Q000502:physiology; D008297:Male; D009518:New York; D011157:Population Dynamics; D011235:Predatory Behavior
keywords: Intraguild predation; cannibalism; coccinellid; competition; invasive species