Chesapeake Science最新文献

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A white southern stingray,Dasyatis americana (Pisces, Dasyatidae), from Pamlico Sound, North Carolina 一种白色的南方黄貂鱼,美洲黄貂鱼(双鱼座,黄貂鱼科),产于北卡罗来纳州帕姆利科湾
Chesapeake Science Pub Date : 1977-03-01 DOI: 10.2307/1350369
F. Schwartz, Glenn Safrit
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引用次数: 15
Bioassay procedures for marine phytoplankton with special reference to chlorine 特别参考氯的海洋浮游植物生物测定程序
Chesapeake Science Pub Date : 1977-03-01 DOI: 10.2307/1350384
M. Roberts
{"title":"Bioassay procedures for marine phytoplankton with special reference to chlorine","authors":"M. Roberts","doi":"10.2307/1350384","DOIUrl":"https://doi.org/10.2307/1350384","url":null,"abstract":"In general, bioassay procedures for phytoplankton have involved measurement of population enumerative parameters (such as specific growth rate, biomass, or chlorophyll a concentration) or population functional parameters (such as 14C uptake) in static cultures exposed to a toxicant. From these data, an estimate is then made of the concentration of the toxicant having some defined effect. Hirayama and Hirano (1970) used the experimental design shown in Fig. 1 to assess the effects of a 5 or 10 min. exposure to chlorine on phytoplankton by measuring subsequent population growth rates. Skeletonema was found to be more sensitive than Chlamydomonas, with the major effect being an increase in the time elapsed before measurable growth occurred. In these experiments, high population densities and nutrient enrichment were employed raising the possibility that the populations were capable of tolerating higher chlorine doses than might natural populations. Roberts and Diaz (1976) measured primary productivity potential of populations of four phytoplankton species (Tetraselmis suecica, Pseudoisochrysis paradoxa, Pyramimonas virginica, and Nannochloris occulatus) exposed to logarithmic chlorine dose series at three temperatures and three salinities (Fig. 2). The cultures were established in filtered pasteurized nonenriched water at cell densities comparable to wild phytoplankton populations (103 cells/ml). The relationship between carbon uptake (expressed as percent of control) and log chlorine dose was often non-linear, whereas the relationship between assimilation ratio (expressed as percent of control) and log chlorine dose was linear (Fig. 3). (Assimilation ratio as used here means the carbon uptake rate/chlorophyll a concentration.) Fig. 4 shows typical results for combined temperature/chlorine effects. Deviation from the original culture temperature tended to increase the sensitivity to chlorine. An unex-","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"28 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":"133602197","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: 8
Problems in measuring residuals in chlorinated seawater 氯化海水中残留量测定的若干问题
Chesapeake Science Pub Date : 1977-03-01 DOI: 10.2307/1350375
J. H. Carpenter
{"title":"Problems in measuring residuals in chlorinated seawater","authors":"J. H. Carpenter","doi":"10.2307/1350375","DOIUrl":"https://doi.org/10.2307/1350375","url":null,"abstract":"","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"33 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":"127658231","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
Behavioral avoidance responses of estuarine fishes to chlorine 河口鱼类对氯的行为回避反应
Chesapeake Science Pub Date : 1977-03-01 DOI: 10.2307/1350387
J. Meldrim, J. Fava
{"title":"Behavioral avoidance responses of estuarine fishes to chlorine","authors":"J. Meldrim, J. Fava","doi":"10.2307/1350387","DOIUrl":"https://doi.org/10.2307/1350387","url":null,"abstract":"","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"18 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":"125024684","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: 12
Biological and physical dynamics of a Georgia tidal creek 乔治亚潮汐溪的生物和物理动力学
Chesapeake Science Pub Date : 1976-12-01 DOI: 10.2307/1350514
C. Hackney, W. D. Burbanck, O. P. Hackney
{"title":"Biological and physical dynamics of a Georgia tidal creek","authors":"C. Hackney, W. D. Burbanck, O. P. Hackney","doi":"10.2307/1350514","DOIUrl":"https://doi.org/10.2307/1350514","url":null,"abstract":"The physical and biological characteristics of five stations in and near a tidal creek were studied for 18 months. Tidal creeks and tidal rivers are differentiated and defined. Diel fluctuations of dissolved oxygen and temperature were greatest and tidal-induced salinity oscillations the least at the headwaters of the creek. Small salinity oscillations promoted a high overall diversity of fishes at the head-waters of the creek, even though few fish species maintained permanent populations there. Juvenile fishes were abundant in the summer and fall. Extreme temperature and low dissolved oxygen levels prompted a migration of fishes from these areas in late summer. Permanent fish populations were found at the mouth of the creek and in an adjacent tidal river.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130514570","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: 79
Proximate causes of mortality determining the distribution and abundance of the barnacle Balanus improvisus Darwin in Chesapeake Bay 决定切萨皮克湾baranus improvisus Darwin分布和丰度的死亡近因
Chesapeake Science Pub Date : 1976-12-01 DOI: 10.2307/1350515
E. Branscomb
{"title":"Proximate causes of mortality determining the distribution and abundance of the barnacle Balanus improvisus Darwin in Chesapeake Bay","authors":"E. Branscomb","doi":"10.2307/1350515","DOIUrl":"https://doi.org/10.2307/1350515","url":null,"abstract":"The effects of predation and competition on survival of the barnacle,Balanus improvisus Darwin, in the upper Chesapeake Bay varied from location to location in 1972 and probably vary from year to year. The flatworm,Stylochus ellipticus Girard, was the predominant predator on barnacles and the bryozoan,Victorella pavida Kent, was the major spatial competitor. Those intertidal barnacles not killed by the flatworms or bryozoans died from exposure to a combination of high winds (25 knots) and low air temperature (−9° C) in the winter. Subtidal barnacle populations were not eliminated by biotic or physical factors and may be the source of those larvae recolonizing the intertidal zone every spring.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127177194","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: 15
Production and fractionation of14CO2 labeled smooth cordgrass,Spartina alterniflora 互花米草14co2标记的制备与分选
Chesapeake Science Pub Date : 1976-12-01 DOI: 10.2307/1350517
R. Fallon, F. Pfaender
{"title":"Production and fractionation of14CO2 labeled smooth cordgrass,Spartina alterniflora","authors":"R. Fallon, F. Pfaender","doi":"10.2307/1350517","DOIUrl":"https://doi.org/10.2307/1350517","url":null,"abstract":"A simple chamber for use in radioactive carbon labeling of plants is described and used to successfully labelSpartina alterniflora. The plant material contained 5.5±1.3 μc/g (dry) after a 1-week pulse. The plant was chemically fractionated and the mean activity (±standard error) was determined in four biochemical fractions: fiber =2.6±0.7 μc/g (dry), organic acid = 2.6±0.1 μc/g (dry), protein/nucleic acid =2.4±0.5 μc/g (dry), and lipid =27.3±6.2 μc/g (dry). The high activity of the lipid fraction indicates that it may serve as a carbon storage pool in the plant under the described growing conditions. The simple, low cost chamber can be used for plant biochemistry experiments, and for the production of labeled detritus and plant fractions.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"104 1236 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115220091","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: 6
Time series analysis and forecasting of Atlantic menhaden catch 大西洋鲱鱼捕获量的时间序列分析与预测
Chesapeake Science Pub Date : 1976-12-01 DOI: 10.2307/1350524
A. L. Jensen
{"title":"Time series analysis and forecasting of Atlantic menhaden catch","authors":"A. L. Jensen","doi":"10.2307/1350524","DOIUrl":"https://doi.org/10.2307/1350524","url":null,"abstract":"The autocorrelation structure of menhaden catch data are examined, and a second order autoregressive model is applied for prediction of menhaden catch. The model is useful for year ahead predictions of catch, and the model enables calculation of confidence intervals or error bounds.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133649970","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: 16
A relict population of the mottled sculpin,Cottus bairdi, from the Maryland coastal plain 一种来自马里兰州沿海平原的斑纹石雕的孑遗种群
Chesapeake Science Pub Date : 1976-12-01 DOI: 10.2307/1350521
R. Franz, David S. Lee
{"title":"A relict population of the mottled sculpin,Cottus bairdi, from the Maryland coastal plain","authors":"R. Franz, David S. Lee","doi":"10.2307/1350521","DOIUrl":"https://doi.org/10.2307/1350521","url":null,"abstract":"A population of mottled sculpin,Cottus bairdi, in the central Delmarva Peninsula (Nanticoke drainage) is the only record of this species from the Atlantic Coastal Plain. Examination reveals that specimens have characteristics of bothC. bairdi and the problematicC. girardi. The presence of other Piedmont indicator-species in this general area suggest a relict Piedmont community.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"54 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120909259","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
Distribution, growth, and predation of juvenile white mullet (Mugil curema) in oceanside waters of Virginia’s eastern shore 分布,生长,幼白鲻鱼(Mugil curema)在弗吉尼亚东海岸的近海水域捕食
Chesapeake Science Pub Date : 1976-12-01 DOI: 10.2307/1350525
C. E. Richards, M. Castagna
{"title":"Distribution, growth, and predation of juvenile white mullet (Mugil curema) in oceanside waters of Virginia’s eastern shore","authors":"C. E. Richards, M. Castagna","doi":"10.2307/1350525","DOIUrl":"https://doi.org/10.2307/1350525","url":null,"abstract":"Distribution, growth, and predation level data for juvenile white mullet (Mugil curema Valenciennes) were obtained in 1965 by shallow water seine hauls during an exploratory survey of oceanside embayments of Virginia’s eastern shore peninsula. Average minimum growth was 17.5 mm fork length per half-month period, June through September. Growth equations fitted with an analog computer are: Wt=615(1−e−0.78t)3 Lt=360(1−e−0.78(t+0.06)) Fork lengths are in mm and weights are in grams. Highest predation incidence, 49%, was observed in late September inlet collections. Literature data implies juvenile white mullet, that occur north of North Carolina, have a southern origin.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129539959","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: 11
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