Effects of indigenous ladybird species (Coleoptera: Coccinellidae) on the survival of an exotic species in relation to prey abundance.

Aspectos biológicos de Harmonia axyridis alimentada com duas espécies de presas e predação intraguilda com Eriopis connexa

“…O refúgio também influenciou a interação entre as duas espécies e diminuiu a taxa de predação de H. axyridis sobre E. connexa, em presença ou em ausência de alimento. Esses resultados concordam com os de Kajita et al (2000). Esses autores avaliaram a interação entre Adalia bipunctata (L.) e H. axyridis, em várias densidades de Aphis craccivora Koch, e não observaram predação de H. axyridis por A. bipunctata, quando submetidas a altas densidades de presas.…”

“…Avaliações sobre a sua competição com outros coccinelídeos, em laboratório, foram realizadas por Kajita et al (2000), Cottrell (2005), Pell et al (2008) e , que verificaram que sua atuação foi dominante em relação à Adalia bipunctata (L.), Coleomegilla maculata De Geer, Olla v-nigrum (Mulsant) e Propylaea japonica Thunberg, em razão do maior tamanho e da presença de estruturas protetoras como os espinhos dorsais ao longo do corpo das larvas.…”

The multicolored Asian ladybeetle Harmonia axyridis (Coleoptera: Coccinellidae) in Quebec agroecosystems ten years after its arrival

“…Harmonia axyridis is thought to affect indigenous ladybeetle species either by exploitative competition or by intraguild predation (Hironori & Katsuhiro, 1997;Yasuda & Ohnuma, 1999;Dixon, 2000;Kajita et al, 2000;Yasuda et al, 2001;Michaud, 2002;Snyder et al, 2004;Lucas et al, 2007). Its establishment was followed by important decreases in natural populations of several local ladybeetle species such as Brachiacantha ursina (Fabricius), Cycloneda munda (Say) and Chilocorus stigma (Say) (Colunga-Garcia & Gage, 1998).…”

Laboratory studies on intraguild predation and cannibalism among coccinellid larvae (Coleoptera: Coccinellidae)

“…This was possibly due to (i) the low mobility of well fed larvae resulting in them encountering one another less frequently (Agarwala & Dixon, 1992;Dixon, 2000); (ii) a faster rate of growth of the intraguild prey (Lucas, 2005) and (iii) an increase in food selectivity as aphids are qualitatively better and may be less risky in terms of being attacked and eaten compared to intraguild prey (Schoener, 1971;Pastorok, 1980;Ernsting & van der Werf, 1988;Montserrat et al, 2006). Previous works on ladybirds (Kajita et al, 2000), lacewings (Phoofolo & Obrycki, 1998) and pentatomids (De Clercq et al, 2003) report a reduction in IGP when extraguild prey was present in the experimental arena. When the same larval stages are paired a reduction in IGP by H. axyridis is reported for the hoverfly Episyrphus balteatus DeGeer (from 100 to 5% of second instar larvae by adding 30 pea aphids) (Ingels & De Clercq, 2011) and A. bipunctata (from 76 to 60% in 24 h by adding 50 cowpea aphids) (Kajita et al, 2000).…”

“…Among these, the high incidence of intraguild predation (IGP) by this species of native ladybirds is one of the most studied both in the Neartic (Kajita et al, 2000;Michaud, 2002;Snyder et al, 2004;Yasuda et al, 2004) and Palearctic regions (Burgio et al, 2002;Hautier et al, 2008;. Laboratory and field assessments suggest that H. axyridis may be a top predator of several native species and the cause of a decrease in guild diversity (Nault & Kennedy, 2003;Roy et al, 2006;Snyder & Evans, 2006;Pell et al, 2008;Brown et al, 2011).…”