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Benthic survey for populations of soft-shelled clams,Mya arenaria, in the lower Potomac River, Maryland
Springer Science and Business Media LLC - Tập 4 - Trang 67-74 - 1963
Exploratory sampling of the potential soft-shelled clam bottoms in the Potomac estuary was conducted to define the range and densities of the subtidal populations ofMya arenaria. Bottom samples were taken at depths ranging from 3 to 11 feet with the Maryland hydraulic clam dredge using a 3/8-inch mesh conveyor belt. Clam populations ranged from the mouth of the river to Popes Creek, approximately ...... hiện toàn bộ
Additional records of aspergillosis among passerine birds in Maryland and the Washington, D. C. metropolitan area
Springer Science and Business Media LLC - Tập 6 - Trang 120-121 - 1965
Two cases of aspergillosis involving four adult cowbirds (Molothrus ater) collected during the nesting season are reported. Aspergillosis was found in house sparrows (Passer domesticus) on two occasions.
Organ Weight: Body Weight Ratios in the Mongolian Gerbil, Meriones unguiculatus
Springer Science and Business Media LLC - Tập 6 Số 2 - Trang 109 - 1965
Food habits and distribution of the fishes of Tuckahoe Creek, Virginia, with special emphasis on the bluegill,Lepomis m. macrochirus rafinesque
Springer Science and Business Media LLC - Tập 7 - Trang 75-89 - 1966
The food habits (1,773 individuals) and the distribution (2,056 individuals) of 9 families, 26 genera, and 32 species of fishes, were determined for Tuckahoe Creek, a lower piedmont tributary of the James River, Virginia. These species represent 41% of the freshwater fishes known for the entire river basin. Five species accounted for 69% of the collection:Etheostoma nigrum (20%),Lepomis macrochiru...... hiện toàn bộ
DNA studies of a Chesapeake Bay population of the tunicate Molgula manhattensis (DeKay) (Ascidiacea)
Springer Science and Business Media LLC - Tập 16 - Trang 208-211 - 1975
Gonadal development and total gonadal DNA of M. manhattensis were studied. Evidence of atrophication and of phagocytosis of residual gametes was found during histological examination. Colorimetric estimations of gonadal DNA indicated that at least two spawning peaks occurred during the summer and suggested that egg release was suppressed by water temperatures above 20 C.
Aspects of molting, growth and survival of male rock crabs,Cancer irroratus, in Chesapeake Bay
Springer Science and Business Media LLC - Tập 16 - Trang 253-265 - 1975
Male rock crabs,Cancer irroratus, were collected from the lower Chesapeake Bay during the winter dredge seasons of 1970–1973. Crabs migrate into Chesapeake Bay in late fall, molt extensively in January, remain in papershell condition until late March and April and leave the bay in May. Most crabs held in the laboratory molted in January, only 18% in February, thus confirming the pattern observed i...... hiện toàn bộ
A new elevation record for the New England cottontail (Sylvilagus transitionalis) in Virginia
Springer Science and Business Media LLC - Tập 17 - Trang 220-221 - 1976
During the period December 17, 1974 through February 23, 1975 the author captured 27 cottontails (Sylvilagus spp.) a total of 110 times at elevations between 1800–2140 ft. The majority of these captures took place in a 6- to 7-year-old clearcut between 1880 and 1980 ft. elevation. Of the 22 cottontails captured at this location, 20 (91 percent) were identified asSylvilagus transitionalis (New Engl...... hiện toàn bộ
Growth of young oyster crabs,Pinnotheres ostreum Say, reared in the laboratory
Springer Science and Business Media LLC - Tập 13 - Trang 221-222 - 1972
Pre-hard juvenile oyster crabs,Pinnotheres ostreum, were reared from the egg in the laboratory. A minimum of 18 days was required for larval development, after which the young crabs passed through several (up to 10) growth molts during 103 days. Survivors ranged from 0.82 to 1.61 mm in carapace width at the end of the experiment. Mean growth (measured as mean increase in carapace width) ranged fro...... hiện toàn bộ
Benthic shoal water invertebrates from tidewaters of Somerset County, Maryland
Springer Science and Business Media LLC - Tập 2 - Trang 89-94 - 1961
Forty-one invertebrate species were collected during two surveys of the soft-shelled clam,Mya arenaria, in Somerset County waters of the Chesapeake Bay area. Quantitative smaples taken with the hydraulic clam dredge were limited to bottoms in waters between 3 and 9 feet deep. Major bottom types, water temperatures, salinities, and dominant species in each of the twelve sampled areas are presented....... hiện toàn bộ
Distribution of Sabellaria vulgaris Verrill (Polychaeta: Sabellariidae) on a sandflat in Delaware Bay
Springer Science and Business Media LLC - Tập 16 - Trang 14-19 - 1975
The vertical distribution of the polychaete Sabellaria vulgaris Verrill and its sandgrain tube material was studied on a sandflat near the mouth of the Mispillion River in Delaware Bay. Numbers of live worms, and amounts of tube material were determined for 13 exposure time zones on the sandflat. Exposure zones were established according to measurements made during an extreme low-water spring tide...... hiện toàn bộ
Tổng số: 551
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