Geology Reports⌕ Search

Geology topics

Research about Laurel, Maryland

Source-linked reports with geographic coverage including Laurel, Maryland.

25 records · Page 2Linked to original sources
USGS1980

Atlantic Flyway review: Region V: Laurel, Prince Georges County, MD (390-0765)

Despite a 22% increase in net-hours, the number of new birds banded dropped 26% from 1977. The decrease was noted in each month and was spread among all of the commonest species, including summer residents, winter residents, permanent residents, and transients. The greatest declines were in Scarlet Tanager (84%), Blue Jay (78%), Red-eyed Vireo (67%), Gray Catbird (62%), Ruby-crowned Kinglet (60%}, Mrytle Warbler (56%), Gray-cheeked Thrush (55%), Wood Thrush (44%0, Cardinal (38%), and White-throated Sparrow (30%). Of these species, only the Scarlet Tanager and Myrtle Warbler had been banded in unusually large numbers in 1977. Partly offsetting the decreases were a few increases: Veery (from 4 to 22 birds), Black-and-white Warbler (3 to 12), and Ovenbird (15 to 34). The four species that had been singled out for mention last year as being victims of the severe winter weather in 1976-77 - the Winter and Carolina Wrens and the Golden- and Ruby-crowned Kinglets - fared no better in 1978. The first three were banded in almost identical nnmbers to 1977, and the Ruby-crown dropped again as indicated in the first paragraph.

Maryland↗
USGS1978

Atlantic Flyway review: Region V: Laurel, Prince Georges County, MD (390-0765)

Back-yard banding above the Patuxent River gorge was limited to early mornings and evenings on 28 days from 20 August through 12 October, and four full days within the same period. Although the number of birds captured per 100 net-hours was well above average in each of the three months, the only species banded in unusually high numbers was the Gray Catbird (68 birds vs. 61, 39, and 32 in 1973, 1974, and 1975).

Maryland↗
USGS1977

Atlantic Flyway review: Region V: Laurel, Prince Georges County, MD

Robbins Nest is located on the fall line one-half mile below Rocky Gorge Reservoir. During the fall migration, about 8 nets are run on the upper part of the 3 acres (edge of the lawn, the garden, under the Virginia Pines, and the upper edge of the mature oak woods that drop 80 feet to the Patuxent River). Foul weather on weekends, combined with commitments away from home, severely restricted this season's operation. August banding was limited to the weekend of the 23-24th. In September, all-day netting was conducted on the 6-7th and 20-21st, and this was supplemented with before- and after-work banding on 16 other days. October banding also was limited to 4 whole days and parts of 16 others.

Maryland↗
USGS1970

Two species of Simuliidae (Diptera), Cnephia ornithophilia and Prosimulium vernale, from Maryland

The finding of Cnephia ornithophilia Davies, Peterson, & Wood and Prosimulium vernale Shewell for the first time at the Patuxent Wildlife Research Center, Laurel, Maryland, is described. Larvae of C. ornithophilia were collected Nov. 15, pupae Feb. 14, and adult flies Feb. 28. No immature or adult specimens were found between Apr. 2 and Nov. 14. The greatest number of immature stages was found in a 3- to 5-foot-wide stream several hundred feet long, 1-8 inches deep, with a stream flow between 0.49 and 3.30 feet per second. The water temperature varied from 0.5° to 4.0°C, the oxygen content was 10-13 ppm; and the p H varied from 6.9 to 7.4. Larvae of P. vernale were collected Nov. 30 through March, pupae from February through Apr. 1, and adult flies from Feb. 26 through Apr. 1. No immature or adult specimens were found between Apr. 2 and Nov. 29. The largest number of immature stages of P. vernale was found in a 6- to 16-foot-wide stream, 100 feet long, and 1.2 inches deep. The stream flow was between 0.92 and 1.36 feet per second. The water temperature was 0.5°C; p H was 6.7; and oxygen content was 7 ppm.

Maryland↗