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A Model of Dynamics in the Lower Potomac River Estuary 波托马克河下游河口的动力学模型
Chesapeake Science Pub Date : 1977-06-01 DOI: 10.2307/1350859
R. Wilson
{"title":"A Model of Dynamics in the Lower Potomac River Estuary","authors":"R. Wilson","doi":"10.2307/1350859","DOIUrl":"https://doi.org/10.2307/1350859","url":null,"abstract":"A simple two-dimensional numerical model has been developed to represent the observed vertical structure of tidal and nontidal currents and tidal elevations along a reach of the lower Potomac River Estuary. The model is based on a linearized longitudinal momentum equation and a laterally averaged continuity equation. It incorporates the effects of a naturally varying channel cross-section through the continuity equation, and a seaward increase in density through the pressure gradient term in the momentum equation. The observed distribution of density in the reach is used to evaluate the horizontal pressure gradient relative to the water surface. The model utilizes a coefficient of vertical eddy viscosity which varies both vertically and longitudinally. With but two adjustable parameters associated with the eddy viscosity, good agreement is obtained between the computed and observed tidal and nontidal currents.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130465102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Toxicity and uptake of Kepone in marine unicellular algae 酮在海洋单细胞藻类中的毒性和吸收
Chesapeake Science Pub Date : 1977-06-01 DOI: 10.2307/1350863
G. Walsh, K. Ainsworth, Alfred J. Wilson
{"title":"Toxicity and uptake of Kepone in marine unicellular algae","authors":"G. Walsh, K. Ainsworth, Alfred J. Wilson","doi":"10.2307/1350863","DOIUrl":"https://doi.org/10.2307/1350863","url":null,"abstract":"Four species of marine unicellular algae were exposed to Kepone in laboratory bioassays. EC50 values after seven days’ growth, in mg/liter (ppm), were:Chlorococcum sp., 0.35;Dunaliella tertiolecta, 0.58;Nitzschia sp., 0.60;Thalassiosira pseudonana, 0.60. When exposed to 100 μg/liter (ppb) Kepone for 24 hr, residues associated with the algae, in mg/kg (ppm) wet weight, were:Chlorococcum sp., 80;D. tertiolecta, 23;Nitzschia sp., 41;T. pseudonana, 52.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"95 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120906490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 20
Cutaneous myxosporidiosis in an American eel, Anguilla rostrate 美洲鳗鲡皮肤黏液孢子虫病
Chesapeake Science Pub Date : 1977-06-01 DOI: 10.2307/1350868
M. W. Newman
{"title":"Cutaneous myxosporidiosis in an American eel, Anguilla rostrate","authors":"M. W. Newman","doi":"10.2307/1350868","DOIUrl":"https://doi.org/10.2307/1350868","url":null,"abstract":"","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130216610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
The fishes of Missouri 密苏里州的鱼
Chesapeake Science Pub Date : 1977-06-01 DOI: 10.2307/1350869
F. Martin, W. L. Pflieger
{"title":"The fishes of Missouri","authors":"F. Martin, W. L. Pflieger","doi":"10.2307/1350869","DOIUrl":"https://doi.org/10.2307/1350869","url":null,"abstract":"","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128343381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 173
A simple hand corer for shallow water sampling 一个简单的手盖浅水采样
Chesapeake Science Pub Date : 1977-06-01 DOI: 10.2307/1350866
J. H. Baker, L. A. Pugh, K. T. Kimball
{"title":"A simple hand corer for shallow water sampling","authors":"J. H. Baker, L. A. Pugh, K. T. Kimball","doi":"10.2307/1350866","DOIUrl":"https://doi.org/10.2307/1350866","url":null,"abstract":"A simple, inexpensive 2″ Hand Corer has been developed for efficiently sampling most types of shallow water sediments. The corer consists of a Lexan plastic core tube, 1-1/2″-check valve unit, and polyvinyl chloride tube handle. The 2″ Hand Corer consistently collected higher mean densities of organisms than did the Mackin Corer, resulting in more precise estimates of the mean densities of the collected taxa. Undisturbed sediment samples for pesticide, oil and grease, and heavy metals analysis also were collected.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129421783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Predation on the ctenophore,Mnemiopsis leidyi, by butterfish,Peprilus triacanthus, in Narragansett Bay, Rhode Island 罗得岛纳拉甘西特湾，三棘蝶鱼捕食栉水母
Chesapeake Science Pub Date : 1977-06-01 DOI: 10.2307/1350867
C. Oviatt, P. Kremer
{"title":"Predation on the ctenophore,Mnemiopsis leidyi, by butterfish,Peprilus triacanthus, in Narragansett Bay, Rhode Island","authors":"C. Oviatt, P. Kremer","doi":"10.2307/1350867","DOIUrl":"https://doi.org/10.2307/1350867","url":null,"abstract":"Consumption rates ofMnemiopsis leidyi by butterfish,Peprilus triacanthus, ranged between 4 ml/gm dry wt/hr to 184 ml/gm dry wt/hr, depending on fish size and feeding history. These rates of comsumption supply adequate food to support the metabolism of the fish and probably account for the late summer-early fall decline in population levels ofMnemiopsis observed in Narragansett Bay.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"297 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121459214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 40
Sedimentation Rates in a Coastal Marsh Determined from Historical Records 根据历史记录确定的沿海沼泽的沉积速率
Chesapeake Science Pub Date : 1977-06-01 DOI: 10.2307/1350858
K. Flessa, Kenneth Constantine, M. K. Cushman
{"title":"Sedimentation Rates in a Coastal Marsh Determined from Historical Records","authors":"K. Flessa, Kenneth Constantine, M. K. Cushman","doi":"10.2307/1350858","DOIUrl":"https://doi.org/10.2307/1350858","url":null,"abstract":"Historical records indicate that Flax Pond, a smallSpartina alterniflora marsh located on the north shore of Long Island, New York, was opened to marine waters in 1803. This opening is recorded in the sediments by a sharp transition from sedge (brackish or fresh water) peat toSpartina (salt marsh) peat. This dated horizon was used to calculate an average net rate of vertical accretion of 2.5 mm/yr and a maximum net rate of 4.7 mm/yr. These estimates may serve to predict the rate at whichSpartina marshes are able to recover from physical disturbance. *** DIRECT SUPPORT *** A00BY066 00002","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129549385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 43
The biology of the stout razor clamTagelus plebeius: II. Some aspects of the population dynamics 粗壮剃刀蛤的生物学:2。人口动态的一些方面
Chesapeake Science Pub Date : 1977-06-01 DOI: 10.2307/1350860
A. Holland, J. Dean
{"title":"The biology of the stout razor clamTagelus plebeius: II. Some aspects of the population dynamics","authors":"A. Holland, J. Dean","doi":"10.2307/1350860","DOIUrl":"https://doi.org/10.2307/1350860","url":null,"abstract":"The population dynamics of the stout razor clam,Tagelus plebeius, were investigated for three years. Density, year-class structure, and recruitment varied with elevation above mean low water, among sample areas, and among years. Recruitment was unimodel and restricted to the late spring. Over 80% of the juveniles recruited in the spring were absent from the sample areas by the following fall. Growth rates ofT. plebeius varied with season, age, and elevation above MLW, but did not vary among sample areas or years.T. plebeius grew faster and reached a larger final length in low intertidal areas. The American Oystercatcher,Haematopus palliatus palliatus, and the stingrays,Dasyatis sabena andDasyatis americana, were the major clam predators identified.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131480324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 35
The Biology of the Stout Razor Clam Tagelus plebeius: I. Animal-Sediment Relationships, Feeding Mechanism, and Community Biology' 粗壮蛏子的生物学:1 .动物-沉积物关系、摄食机制和群落生物学
Chesapeake Science Pub Date : 1977-03-01 DOI: 10.2307/1350364
A. Holland, J. Dean
{"title":"The Biology of the Stout Razor Clam Tagelus plebeius: I. Animal-Sediment Relationships, Feeding Mechanism, and Community Biology'","authors":"A. Holland, J. Dean","doi":"10.2307/1350364","DOIUrl":"https://doi.org/10.2307/1350364","url":null,"abstract":"Six intertidal populations ofTagelus plebeius, the stout razor clam, and associated macroinvertebrates were sampled in the North Inlet estuary, near Georgetown, South Carolina.T. plebeius inhabited only stable sediments composed of greater than 2.0 % silts and clays and which were covered by a visible surface film of benthic microalgae. Gut contents, gill morphology, and behavior all indicated that this clam functioned as a suspension feeder obtaining its nutrition by filtering suspended particles from the water column. Maintenance of the siphon tubes and burrows was important to the survival of this organism.T. plebeius was quantitatively an important member of the infuana within its habitat, composing 93.0% of the biomass, but only 3.2% of the total number of individuals. Sediment stability, in addition to affecting the distribution ofT. plebeius, also had a significant role in determining the structure of invertebrate communities inhabiting the intertidal sandbars sampled. The stable muddy-sand sediments of lagoon areas supported a more diverse faunal assemblage than did the less stable sandy sediments of fringe areas of the same sandbar.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124650722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 81
Phenylpropanoids in chlorination 氯化过程中的苯丙素
Chesapeake Science Pub Date : 1977-03-01 DOI: 10.2307/1350382
R. Hsu, Y. Shimizu
{"title":"Phenylpropanoids in chlorination","authors":"R. Hsu, Y. Shimizu","doi":"10.2307/1350382","DOIUrl":"https://doi.org/10.2307/1350382","url":null,"abstract":"are abundant in plants in free and conjugated forms. The presence of phydroxycinnamic acid and its derivatives in rivers has been reported. Chlorine not only works oxidatively but also reacts with organic compounds to form chlorinated compounds which may be hazardous to human health, and also many have impact upon ecological systems. In order to clarify this problem, phenylpropanoids which are likely to exist in water systems polluted with organic materials have been treated with various concen-","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1977-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120893334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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