XIII Number 1 - 2 Spring / Summer 1990
نویسندگان
چکیده
Sunbelt Social Network Conference, 1990 27
منابع مشابه
The effects of host plant phenology on the demography and population dynamics of the leaf-mining moth, Cameraria hamadryadella (Lepidoptera: Gracillariidae)
1. We examined the effects of variation in the timing of spring leaf production and autumn leaf fall on the survival, mortality and abundance of Cameraria hamadryadella on Quercus alba and Q. macrocarpu. 2. We monitored and manipulated the timing of foliation on field and potted Q.alba trees and observed the abundance of C. hamadryadella on those trees. We also monitored and manipulated the tim...
متن کاملEffects of melatonin and progesterone administered to ewes in spring and summer.
Melatonin (MEL) was evaluated for effects on LH, prolactin (PRL) and fertility in spring (Exp. 1, 2) and summer (Exp. 3 to 5). In Exp. 1, 17 ovariectomized ewes bearing estradiol implants were fed 3 mg MEL or vehicle for 44 d beginning May 1. Melatonin decreased (P less than .001) PRL levels but had no effect on LH secretion and response to GnRH. In Exp. 2, 12 ewes each received a 40-d MEL ear ...
متن کاملHUMPBACK WHALE ( Megaptera novaeangliae ) : Eastern North Pacific Stock
STOCK DEFINITION AND GEOGRAPHIC RANGE Although the International Whaling Commission (IWC) only considered one stock (Donovan 1991), there is now good evidence for multiple populations of humpback whales in the North Pacific (Johnson and Wolman 1984; Baker et al. 1990). Aerial, vessel, and photo-identification surveys, and genetic analyses indicate that within the U.S. EEZ, there are at least th...
متن کاملTemperature and light dependence of the VOC emissions of Scots pine
The volatile organic compound (VOC) emission rates of Scots pine (Pinus sylvestris L.) were measured from trees growing in a natural forest environment at two locations in Finland. The observed total VOC emission rates varied between 21 and 874 ng g−1 h−1 and 268 and 1670 ng g−1 h−1 in southern and northern Finland, respectively. A clear seasonal cycle was detected with high emission rates in e...
متن کاملThe relationship between size and parity status of field collected Culiseta melanura.
The relationship between body size and parity status of adult female Culiseta melanura collected from 3 locations in northeastern United States was studied by measuring wing lengths and examining ovaries of individual mosquitoes. Virus isolation was attempted from Cs. melanura collected in Maryland and in New Jersey. At all 3 locations, the size of Cs. melanura collected varied from large in th...
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