Persistence of a sugar-rejecting cockroach genotype under various dietary regimes

Abstract

Glucose-aversion is a heritable trait that evolved in a number of German cockroach (Blattella germanica L.) populations in response to strong selection with glucose-containing insecticide baits. However, in the absence of glucose-containing bait, glucose-averse (GA) cockroaches have lower performance than wild-type (WT) cockroaches in several fitness-determining traits. We allocated 48 caged populations initiated with homozygous GA and WT adults to four dietary treatments consisting of either pure rodent chow, rodent chow mixed to yield a content of either 20% glucose or 20% fructose, or a treatment consisting of choice between the 20% glucose- and the 20% fructose-containing food. After 6 months we found significantly higher frequency of WT individuals in populations restricted to the 20% glucose food, and after 12 months all dietary treatments contained significantly more WT individuals than expected. In accompanying experiments, we found lower survival and longer development time of GA nymphs restricted to glucose-containing food. We furthermore found evidence for assortative mating of females with males from their own genotype, with significant differences within WT cockroaches. Our study shows experimental evidence that within heterogeneous populations, WT German cockroaches will over time prevail in abundance over GA individuals, even when glucose is not a dietary component.

Changes in the Peripheral Chemosensory System Drive Adaptive Shifts in Food Preferences in Insects

“…Glucose-aversion can drive other behavioral polymorphisms in German cockroach populations, even in bait-free natural environments. The population dynamics of WT and GA is significantly impacted by a difference in mate-choice of WT and GA females ( Jensen et al, 2017 ). There are no differences in nymph development and female fecundity between GA and WT cockroaches provisioned with glucose-free food.…”

“…The difference in mate preferences also impacts the demography of populations initiated with equal numbers of WT and GA females and males. When provisioned with glucose-containing food, the proportion of WT cockroaches increased over 12 months because of high mortality and delayed nymph development of GA cockroaches ( Jensen et al, 2017 ). But even when provisioned with rodent chow or chow supplemented with fructose, the proportion of WT cockroaches increased gradually.…”

Efektivitas Zat Aktif Fipronil pada Berbagai Substrat Fagostimulan untuk Pengendalian Kecoak Jerman (Blattella germanica L.)

“…Hal ini kemungkinan disebabkan oleh perilaku kecoak Jerman yang pada umumnya akan bergerak secara random dalam memilih makanan pada saat didedahkan pertama kali. Kecoak Jerman akan memilih semua makanan yang tersedia di sekitarnya karena kecoak merupakan serangga yang bersifat omnivora (Jensen et al, 2017). Perilaku ini disusul dengan mencicipi makanan, jika merasa tidak cocok maka kecoak akan meninggalkannya dan mencari makan lain yang sesuai palatabilitasnya.…”

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“…Beberapa laporan terkait resistensi perilaku pada kecoak Jerman adalah adanya perilaku glucose aversion/bait version (Silverman & Bieman, 1993), ditemukan 12% starin yang terdeteksi menghindari glukosa dari 41 strain yang diujikan di Malaysia (Lee & Soo, 2002), adanya reaksi menghindari glukosa dan fruktosa serta adaptasi gustatori kecoak Jerman pada populasi kecoak Jerman yang heterogen (Jensen et al, 2016;Jensen et al, 2017;Wang et al, 2004) Di Indonesia juga dilaporkan adanya potensi perkembangan perilaku glucose aversion/bait aversion pada beberapa strain kecoak Jerman (Ambarningrum et al, 2019).…”