Results 151 to 160 of about 6,143 (181)
Some of the next articles are maybe not open access.
Purification and characterization of the Danaus plexippus cryptochromes
2007Cryptochromes are flavoproteins that function as blue-light photoreceptors to regulate growth in plants and to entrain the circadian clock in animals. The photochemical and signaling mechanisms by which cryptochromes function are still undefined. Two cryptochromes identified in Danaus plexippus have shown distinct in vivo activities where DpCry1 is ...
openaire +1 more source
Simulation of movement and egglaying in Danaus plexippus (Lepidoptera: Nymphalidae)
Population Ecology, 1983SummaryA model simulating the movement and oviposition of monarch butterflies over a female's life time is presented. The model's predictions compare favourably with observed data and suggest that females who lay eggs in an optimal fashion should have low directionalities in areas with high host plant density (patches and single plants) and high ...
openaire +4 more sources
The structure and function of the bursa copulatrix of the monarch butterfly (Danaus plexippus)
Journal of Morphology, 1984AbstractThe bursa compulatrix of the Monarch butterfly was investigated utilizing light microscopy, histochemistry, and scanning and transmission electron microscopy in order to relate its morphology to the release of sperm from the spermatophore. The bursa has a row of large chitinous teeth on either side of the organ.
Steffen H, Rogers, Harrington, Wells
openaire +2 more sources
The Analysis and Description of Movement in Adult Danaus Plexippus L. (Lepidoptera: Danainae)
Behaviour, 1982Interactions among flying butterflies, D. plexippus, and various densities and dispersions of their milkweed food-plants, Asclepias spp., were studied using a continuously recording tracking device. The tracks and searching behavior of male and female D. plexippus are described in terms of the so-called rules of movement. The biological significance of
Zalucki, Myron P., Kitching, Roger L.
openaire +4 more sources
Hormonal regulation of hemolymph lipid concentration in the Monarch Butterfly, Danaus plexippus
General and Comparative Endocrinology, 1978Abstract Selective elevation of hemolymph lipid can be demonstrated in flying Monarch Butterflies. In addition, the low levels of hemolymph lipid characteristic of wild-caught postmigratory Monarchs remain low in winter conditions but are rapidly elevated when winter animals are placed in summer conditions.
S H, Dallmann, W S, Herman
openaire +2 more sources
Journal of Chemical Ecology, 1990
California overwintering monarch butterflies contain both pyrrolizidine alkaloids (PAs) and theirN-oxides. Analysis of 76 individual monarchs by TLC, HPLC, GLC, and GC-MS has shown the presence of three types of PAs, the saturated diester sarracine, the saturated monoester 7-angelylplatynecine, and the unsaturated dialcohol retronecine.
M E, Stelljes, J N, Seiber
openaire +2 more sources
California overwintering monarch butterflies contain both pyrrolizidine alkaloids (PAs) and theirN-oxides. Analysis of 76 individual monarchs by TLC, HPLC, GLC, and GC-MS has shown the presence of three types of PAs, the saturated diester sarracine, the saturated monoester 7-angelylplatynecine, and the unsaturated dialcohol retronecine.
M E, Stelljes, J N, Seiber
openaire +2 more sources
Courtship Behavior of the Monarch Butterfly, Danaus plexippus L.
Annals of the Entomological Society of America, 1975Observations in the field and in a flight cage reveal that the courtship of the monarch butterfly consists of an aerial phase and a ground phase, each composed of several behavioral components. These include “nudging” by the male, aerial pursuit, aerial “hairpencilling,” aerial takedown of the female, antennal palpation by the male, copulation, and ...
openaire +1 more source