Life-history traits may have an important role in promoting species coexistence. However, the complexity of certain life cycles makes it difficult to draw conclusions about the conditions for coexistence or exclusion based on the study of short-term competitive dynamics. Brachionus plicatilis and B. manjavacasare two cryptic rotifer species co-occurring in many lakes on the Iberian Peninsula. T...

1. The tarsal acceptance threshold of non-diapausing adult blowflies rises with age. 2. Diapausing flies have a non-significantly elevated tarsal acceptance threshold, but drink significantly less sucrose solution than their non-diapausing counterparts. 3. Removal of diapausing flies to non-diapause inducing conditions resulted in a lowering of the threshold. 4. Failure to demonstrate a signifi...

-1. Wing epidermis from diapausing and non-diapausing silkmoths (Antheraea pernyi) was assayed for NADH [nicotinamide adenine dinucleotide (reduced form)] oxidase, NADHand succinate-cyctochrome c reductases, and cytochrome c oxidase. 2. Diapausing pupae showed a marked decline in activities after pupation and the same subsequent profile of very low activities reported for diapausing Cecropia si...

We describe the application of a simple, low-cost, and effective method of DNA extraction (hot sodium hydroxide and Tris, HotSHOT) to the diapausing propagules of continental aquatic invertebrates for its use in PCR amplification. We illustrate the use of the technique in cladocerans, rotifers, anostracans, notostracans, and copepod diapausing eggs. We compare the performance of the HotSHOT tec...

Normally the egg of Ephippiger cruciger is subject to diapause when the embryo is almost fully developed. Most eggs die or develop erratically and slowly when chilled for some time at earlier non-diapausing stages. However, after 2 or 3 months' cooling at a stage just before catatrepsis a few eggs developed more rapidly than usual and hatched without intervention of a diapause, at a temperature...

The activities of four oxidative enzyme systems, including NADH oxidase, succinate-cytochrome c reductase, NADH-cytochrome c reductase, and cytochrome c oxidase, were compared in mitochondrial-microsomal preparations from wing epidermis and fat body of diapausing Samia Cynthia pupae, presumptively non-diapausing S. Cynthia ricini pupae which were caused to diapause by removal of the brain, and ...

Phytosanitation regulations in several international markets require postharvest treatments to control codling moth, Cydia pomonella (L.) (Lepidoptera: Tortricidae), in various commodities. Thermal treatments are gaining acceptance to replace chemical fumigation. Determining the most thermal-tolerant life stage is essential in the development of effective postharvest insect control protocols ba...

Non-diapausing spider mites (Tetranychus urticae) live on the undersurface of host leaves during summer, but diapausing mites overwinter in dark hibernacula. The light environments of these habitats differ: visible radiation (VIS) but not ultraviolet radiation (UV) reaches the undersurface of leaves, but neither enters dark hibernacula. Thus, mites of either seasonal form could locate their pre...