![]() This subspecies has been seen in the South Andaman (Chidiyatapu), Car Nicobar, Central Nicobars and at Great Nicobar. Antennae, head, thorax and abdomen as in malabarica. On the underside, this subspecies is as variable as the typical form, but the ground colour in many specimens (presumably wet-season broods) is of a richer, almost metallic green, with the basal snow-white spots defined with black lines the ocelli in interspaces 2 and 5 seem also to be more clearly defined than in the Indian form. On the upperside of the hindwing there is an inner as well as an outer conspicuous subterminal narrow-black band. This subspecies closely resembles the Indian form, but differs in the oblique yellow band on the upperside of the forewing, which is broader and extends from the middle of the costal margin uninterruptedly to interspace 4, though it is preapically constricted. Doleschallia bisaltide andamanensis Fruhstorfer, 1899.There are several subspecies under Doleschallia bisaltide: The pupae are yellowish with numerous black spots constricted in the middle head produced into two points. They feed on Artocarpus, Pseuderanthemum, Calycanthus, Ruellia, Girardina, Strobilanthus and Graptophyllum. Head with a pair of branched spines rest of the segments with a dorsal and a lateral row of blue branched spines on each side. In addition to on-the-ground measurements of tree phenology, we also measure seasonal changes at the Harvard Forest using webcams perched atop our research towers.The larvae are black, with two rows of dorsal white spots. These changes along with the timing of a plant's flowering and leaf development in the spring are part of what is called its phenology, a term that includes all relationships between periodic biological activity and climate, including migrations, dormancy, etc. The timing of many individual species' autumn coloration and leaf drop is being documented at the Harvard Forest. Rainy and windy weather during the autumn can knock leaves down prematurely thereby shortening the color display at its peak. The reds (anthocyanins), which require sunlight for production, are enhanced by cold and sunny days. The right weather during the autumn can promote more intense color production. Adequate summer rains promote good tree health, leaf retention and, therefore, color production during the autumn. The result is a reduction of color during the peak of the season. They may thus lose their leaves prematurely or start color production prematurely. Some trees produce their colors earlier than others, and the mix of species may affect the peak color production. ![]() ![]() European forests seem to lack many species that produce good color, especially the reds. In the northeast more pines and hemlocks reduce the color intensity, although the presence of some conifers provides a nice contrast to the bright colors. What Trees are Presentįew broadleaf trees, and lots of conifers, mean a primarily green display in autumn. The following factors appear to be important in the color displays. Predicting color intensity and timing may be economically interesting because the colors are a huge tourist draw, worth hundreds of millions of dollars in revenues every year. People in New England would argue that the autumn colors in their forests are the most colorful, although people in the southern Appalachians would argue otherwise. For instance, aging leaves in tropical forests generally do not change color. Although always impressive, autumn leaf colors vary from year to year, and seem to be more intense in some regions. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |