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The Migration Of Adult Female Blue Crabs, Callinectes Sapidus Rathbun, In Chincoteague Bay And Adjacent Waters, David G. Cargo
The Migration Of Adult Female Blue Crabs, Callinectes Sapidus Rathbun, In Chincoteague Bay And Adjacent Waters, David G. Cargo
Journal of Marine Research
A total of 392 adult female blue crabs were tagged at four different points in the Chincoteague Bay area from 31 July to 7 September 1953. Over a period including June 1954, about 25% were recaptured, mostly to the south of the release points. Only three had moved northward, and only two were recaptured outside the area; one in Delaware Bay and one at Oyster, Virginia. Factors that may influence their movements and some ecological considerations are discussed.
Polarographic Determination Of Nitrate In Sea Water, David Tung-Whei Chow, Rex J. Robinson
Polarographic Determination Of Nitrate In Sea Water, David Tung-Whei Chow, Rex J. Robinson
Journal of Marine Research
A new and accurate method for the determination of nitrate in sea water, based on the pola.rographic reduction of nitrate in the presence of uranyl ions, is presented. Sulfate ions depress the reduction current by a definite proportion, depending on the chlorinity of the water sample; for chlorinities in the range of 14 to 19 ‰, this effect is rather constant. Fluoride interferes strongly with the reduction of nitrate, but aluminum or zirconyl salts may satisfactorily eliminate this effect. Other interfering ions and preservatives are also discussed. A procedure for the determination of nitrate in sea water ha.s been proposed …
Further Observations On The Breeding And Migration Of The Bermuda Spiny Lobster, Panulirus Argus, W. H. Sutcliffe Jr.
Further Observations On The Breeding And Migration Of The Bermuda Spiny Lobster, Panulirus Argus, W. H. Sutcliffe Jr.
Journal of Marine Research
Some results of investigations of breeding, distribution, and migration of Panulirus argus in Bermuda during 1951 and 1952 are given. A graphic schedule of breeding events for females includes the times of appearance of the first and second spermatophores and the first and second eggs.
Relation Of Fishes And Other Organisms To The Scattering Of Underwater Sound, Gordon H. Tucker
Relation Of Fishes And Other Organisms To The Scattering Of Underwater Sound, Gordon H. Tucker
Journal of Marine Research
An analysis of concurrent sound-scattering records and biological collections in the sea show a correlation of the deeper and more intense scattering of sound with fishes and of the upper and lighter scattering with a dominant population of euphausiids. The main group of fishes concerned are the Myctophidae, which possess all of the essential qualifications of scatterers.
Sound As A Tool In Marine Ecology, From Data On Biological Noises And The Deep Scattering Layer, Martin W. Johnson
Sound As A Tool In Marine Ecology, From Data On Biological Noises And The Deep Scattering Layer, Martin W. Johnson
Journal of Marine Research
In studies of specific populations or communities of different animals, the investigator is concerned largely with relative concentrations of individuals and with their feeding and breeding behavior, migratory habits, etc., as individuals or as groups. Information on these aspects is fundamental to an analysis and understanding of the faciors that operate as controls within the population.
Water Tables In Marine Beaches, K. O. Emery, J. F. Foster
Water Tables In Marine Beaches, K. O. Emery, J. F. Foster
Journal of Marine Research
Beach slopes, sand movements, and sand composition have been studied by a number of organizations and individuals, but the interstitial water and the possible interrelations between beach characteristics and changing water levels within the beach seem to have received little attention....
A Salinometer For Use In Brackish Water, William S. Von Arx
A Salinometer For Use In Brackish Water, William S. Von Arx
Journal of Marine Research
In principal this salinometer is a "battery" composed of a pair of dissimilar metals immersed in the brackish water of the field as an electrolyte. Between these dissimilar metals there exists a potential difference which is practically independent of the concentration of salts in the electrolyte over a very wide range. However, the salt concentration has a marked effect upon the conductivity of the electrolyte. If the measuring circuit has constant resistance, the only change of resistance in the total circuit is that due to the change of conductivity of the water in which the cell is immersed. Since the …
Correlations In Aquatic Ecology With An Example Of Their Application To Problems Of Plankton Productivity, Gordon A. Riley
Correlations In Aquatic Ecology With An Example Of Their Application To Problems Of Plankton Productivity, Gordon A. Riley
Journal of Marine Research
Much of the ecological work of the present time is concerned with the direct observation of natural variations in environment and biota, followed by an examination of the relationships between variables and speculation as to their meaning….