Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 7 of 7
Full-Text Articles in Entire DC Network
Observations Of The Eastern Maine Coastal Current And Its Offshore Extensions In 1994, Neal Pettigrew, David Townsend, Huijie Xue, J. P. Wallinga, P. J. Brickley, R. D. Hetland
Observations Of The Eastern Maine Coastal Current And Its Offshore Extensions In 1994, Neal Pettigrew, David Townsend, Huijie Xue, J. P. Wallinga, P. J. Brickley, R. D. Hetland
Marine Sciences Faculty Scholarship
Cold surface temperatures, reflecting Scotian Shelf origins and local tidal mixing, serve as a tracer of the Eastern Maine Coastal Current and its offshore extensions, which appear episodically as cold plumes erupting from the eastern Maine shelf. A cold water plume emanating from the Eastern Maine Coastal Current in May 1994 was investigated using advanced very high resolution radiometer (AVHRR) imagery, shipboard surveys of physical and biochemical properties, and satellite-tracked drifters. Evidence is presented that suggests that some of the plume waters were entrained within the cyclonic circulation over Jordan Basin, while the major portion participated in an anticyclonic eddy …
Importance Of Suspended Particulates In Riverine Delivery Of Bioavailable Nitrogen To Coastal Zones, Lawrence M. Mayer, R. G. Keil, S. A. Macko, S. B. Joye, K. C. Ruttenberg, R. C. Aller
Importance Of Suspended Particulates In Riverine Delivery Of Bioavailable Nitrogen To Coastal Zones, Lawrence M. Mayer, R. G. Keil, S. A. Macko, S. B. Joye, K. C. Ruttenberg, R. C. Aller
Marine Sciences Faculty Scholarship
Total nitrogen (TN) loadings in riverine sediments and their coastal depocenters were compared for Il river systems worldwide to assess the potential impact of riverine particulates on coastal nitrogen budgets. Strong relationships between sediment specific surface area and TN allow these impacts to be estimated without the intense sampling normally required to achieve such budgets. About half of the systems showed higher nitrogen loadings in the riverine sediments than those from the coastal depocenter. In spite of uncertainties, these comparisons indicate that large, turbid rivers, such as the Amazon, Huanghe, and the Mississippi, deliver sediments that in turn release significant …
Small-Scale Features Of Marine Sediments And Their Importance To The Study Of Deposit-Feeding, Les Watling
Small-Scale Features Of Marine Sediments And Their Importance To The Study Of Deposit-Feeding, Les Watling
Marine Sciences Faculty Scholarship
Techniques currently in use by sedimentologists for the study of marine sedment microfabric are of limited use for understandmg the relationship between sediment organic matter and mineral grains. In this article it is shown that by combining standard histological protocols for fixation and dehydration with petrological protocols for resin embedding and thin sectioning, very fine details of the sediment structure can be seen. Because of the ubiquitous presence of the organic matrix, organicmineral aggregates are not seen in situ. Other features of the sediment of importance to deposit-feeders, such as the presence of intact chloroplasts, can be observed through the …
A Low-Flow Self-Cleaning Drainage System For Fish Rearing Tanks, D. S. Hagopian, John G. Riley
A Low-Flow Self-Cleaning Drainage System For Fish Rearing Tanks, D. S. Hagopian, John G. Riley
Marine Sciences Faculty Scholarship
A float-stopper mechanism was designed to drain fish holding tanks directly from the bottom. Unlike traditional, top-drawn standpipe systems, it allows continuous flushing of settled solid waste. It also prevents the accumulation of these wastes between the two standpipes that are used in bottom-drawn, double-walled standpipe systems. When suspended solids are forced upward between the outer and inner standpipes of such systems, a minimum velocity must be maintained to prevent sediment accumulation. This minimum velocity determines the minimum flow rate through the tank. The system described in this report flushes well over a wide range of flow rates.
On The Identity Of Spencebatea Abyssicola (Cumacea), With Additional Observations On The Genera Allied To Procampylaspis, Les Watling
Marine Sciences Faculty Scholarship
In 1879 Norman described Spencebatea abyssicola, new genus, new species, on the basis of a single specimen from a deep-sea site off Ireland. The species was transferred to the genus Cumella by Stebbing in 1913, where it has remained. A reexamination of the specimen indicated that it belongs to the genus Procampylaspis since it possesses the recurved, tooth-bearing dactyl on maxilliped 2 which characterizes the genus. Seven other genera also exhibit modified dactyls on maxilliped 2, and, in addition, have styliform mandible molars, thus forming a coherent group within the family Nannastacidae.
Phylogenetic Relationships Of Clawed Lobster Genera (Decapoda : Nephropidae) Based On Mitochondrial 16s Rrna Gene Sequences, Y. K. Tam, Irv Kornfield
Phylogenetic Relationships Of Clawed Lobster Genera (Decapoda : Nephropidae) Based On Mitochondrial 16s Rrna Gene Sequences, Y. K. Tam, Irv Kornfield
Marine Sciences Faculty Scholarship
Approximately 350 base pairs (bp) of the mitochondrial 16S rRNA gene were used to study the phylogenetic relationships among 5 genera of the clawed lobster family Nephropidae (infraorder Astacidea), including Homarus, Homarinus, Metanephrops, Nephrops, and Nephropsis. Maximum-parsimony analysis, using a hermit crab, Pagurus pollicaris (infraorder Anomura), as an outgroup. produced a tree topology in which Homarus and Nephrops formed a well-supported clade that excluded Homarinus. The same tree topology was obtained from both neighbor-joining and maximum-likelihood analyses, Some morphological characters that appear synapomorphic for Nephrops and Metanephrops may be due to convergence rather than symplesiomorphy. The current taxonomy, therefore, does …
Different Early Post-Settlement Strategies Between American Lobsters Homarus Americanus And Rock Crabs Cancer Irroratus In The Gulf Of Maine, A. T. Palma, Richard Wahle, Robert Steneck
Different Early Post-Settlement Strategies Between American Lobsters Homarus Americanus And Rock Crabs Cancer Irroratus In The Gulf Of Maine, A. T. Palma, Richard Wahle, Robert Steneck
Marine Sciences Faculty Scholarship
The abundance of many invertebrates with planktonic larval stages can be determined shortly after they reach the benthos. In this study, we quantified patterns of abundance and habitat utilization of early benthic phases of the American lobster Homarus americanus and the rock crab Cancer irroratus. These 2 decapods are among the most common and abundant macroinvertebrates in coastal zones of the Gulf of Maine, with similar densities of larger individuals. Settlement and early postsettlement survival indicate that lobsters are highly substrate-specific early in life, settling predominantly in cobble beds. Crabs appear to be less selective, setting both in cobble and …