Life Sciences Commons^™

Diapause Induction In Eastern North American Populations Of Propylea Quatuordecimpunctata And Hippodamia Variegata (Coleoptera: Coccinellidae), John J. Obrycki

Lady Beetle Research Data

Experiments examined the effect of photoperiod on the expression of adult diapause in North American populations of two Palearctic ladybird beetle species, Propylea quatuordecimpunctata and Hippodamia variegata.

Comparative data for the reproductive responses to different photoperiod conditions for H. variegata were taken from Obrycki (2018). Additionally, comparisons of responses to the four photoperiods between P. quatuordecimpunctata from Jefferson County, NY, USA to P. quatuordecimpunctata from Montreal, Quebec, Canada were also conducted. Data for the Montreal, Quebec, Canada population are from Obrycki et al., (1993).

Two Data sets are included:

(1) Pre-oviposition period (days) as a measure of induction and …

Assessing Endophyte Frequency Distributions And The Effect Of Epichloë Brachyelytri In The Chemotypic And Genotypic Diversity Of Brachyelytrum Erectum, Rachel Ann Sneed

Theses and Dissertations--Plant Pathology

Seed-transmissible epichloid fungal endophytes are best known for their roles as defensive mutualists in cool-season grasses. Historically, the discovery of fungal endophytes was driven by investigations of plant toxicity to livestock, followed by extensive study of their alkaloids and protection against insects and nematodes. Epichloae can produce four classes of alkaloids: ergot alkaloids, lolines (saturated aminopyrrolizidines), indole–diterpenes, and peramine. It is increasingly evident that these hereditary symbionts have much more diverse chemical profiles both in individual populations and between them. To this end, differences in chemotypic profiles of these symbionts may translate to different evolutionary and environmental advantages across plant …

Diapause In Eastern North American Populations Of Coccinella Septempunctata (Coleoptera: Coccinellidae), John J. Obrycki

Lady Beetle Research Data

Experiments examined the effect of photoperiod on the expression of adult diapause in the Palearctic ladybird beetle Coccinella septempunctata, within 10 years of its discovery in North America. The study used beetles from two populations in eastern United States and focused on two aspects of diapause. First, the effects of daylength on the induction and depth (or duration) of diapause were examined by rearing and maintaining adult beetles from Tompkins County, New York,(approx. 42.4°N, 76.5°W) under six constant photoperiods until oviposition, death, or the passage of 125 days. Second, the seasonal progression of diapause maintenance and termination under natural conditions …