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A record of the white bass,Morone chrysops, from the Susquehanna river 来自萨斯奎哈纳河的白鲈鱼，Morone chrysops的记录
Chesapeake Science Pub Date : 1976-12-01 DOI: 10.2307/1350523
Robert F. Denoncourt, W. Potter, D. W. Daniels
{"title":"A record of the white bass,Morone chrysops, from the Susquehanna river","authors":"Robert F. Denoncourt, W. Potter, D. W. Daniels","doi":"10.2307/1350523","DOIUrl":"https://doi.org/10.2307/1350523","url":null,"abstract":"","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"86 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134392119","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: 0
Early planktonic larvae of the blackcheek tonguefish,Symphurus plagiusa (Pisces: Cynoglossidae), in the lower Chesapeake Bay 切萨皮克湾下部的黑颊舌鱼(双鱼座:舌鱼科)的早期浮游幼虫
Chesapeake Science Pub Date : 1976-12-01 DOI: 10.2307/1350510
J. Olney, G. C. Grant
{"title":"Early planktonic larvae of the blackcheek tonguefish,Symphurus plagiusa (Pisces: Cynoglossidae), in the lower Chesapeake Bay","authors":"J. Olney, G. C. Grant","doi":"10.2307/1350510","DOIUrl":"https://doi.org/10.2307/1350510","url":null,"abstract":"One hundred ninety-four larvae ofSymphurus plagiusa were taken in the lower Chesapeake Bay during a three-year zooplankton survey 1971–1974. Early larval stages (1.3–6.2 mm NL) are illustrated and described. Recently hatched larvae (1.3–2.8 mm NL) are distinguished by pigment patterns, gut configuration, and a fleshy occipital hump. Later larvae (2.8–6.2 mm NL) are identified by pigmentation, gut configuration and produced dorsal rays.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"194 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":"123170709","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: 17
Growth and Mortality of Littorina irrorata Say in Three North Carolina Marshes 北卡罗莱纳三片沼泽地的小蠹生长与死亡
Chesapeake Science Pub Date : 1976-09-01 DOI: 10.2307/1351194
A. E. Stiven, J. T. Hunter
{"title":"Growth and Mortality of Littorina irrorata Say in Three North Carolina Marshes","authors":"A. E. Stiven, J. T. Hunter","doi":"10.2307/1351194","DOIUrl":"https://doi.org/10.2307/1351194","url":null,"abstract":"During one year, growth and mortality of the salt marsh gastropod,Littorina irrorata, were examined at three levels of population density within three salt marshes in the Morehead City region of North Carolina. Density was manipulated by enclosures. The standing crop of the dominant vegetationSpartina alterniflora differed among the three marshes. Overall weight gain ofLittorina differed among marshes, density treatments, and three size classes of snails. Weight gain in the smallest individuals was significantly different among the three marsh areas, but not the density treatments. For intermediate-sized individuals, growth rate differences occurred only in response to the density treatments. In adults, weight gain was different in the three marshes, but the density treatments had little effect. Within-cage mortality appeared independent of the density treatments, but significantly different among the three marshes. Computed equations characterized average annual growth in shell width ofLittorina irrorata in the three marshes.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134164044","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: 34
A mixed-dimension kinematic estuarine model 混合维河口运动学模型
Chesapeake Science Pub Date : 1976-09-01 DOI: 10.2307/1351190
A. Elliott
{"title":"A mixed-dimension kinematic estuarine model","authors":"A. Elliott","doi":"10.2307/1351190","DOIUrl":"https://doi.org/10.2307/1351190","url":null,"abstract":"A kinematic model, developed for use during conditions of low salinity when the upper reaches of an estuary are vertically mixed, divides the estuary into one-and two-dimensional regimes. The model has been applied to the Potomac by assuming that the estuary is one-dimensional above Maryland Point and two-dimensional seaward of Morgantown.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116945476","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
Response of the patuxent estuary to a winter storm 延伸性河口对冬季风暴的响应
Chesapeake Science Pub Date : 1976-09-01 DOI: 10.2307/1351200
A. Elliott
{"title":"Response of the patuxent estuary to a winter storm","authors":"A. Elliott","doi":"10.2307/1351200","DOIUrl":"https://doi.org/10.2307/1351200","url":null,"abstract":"Current and tidal records from the Patuxent estuary are analyzed to investigate the response of the river after a two-day period of strong northwesterly winds. The storm depressed mean water levels throughout the Chesapeake area, and the Patuxent, required about two days to recover to its former mean water level. Surface slopes provided evidence for the existence of a long period seiche.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125343857","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
Responses of embryonic Cyathura polita (stimpson) (Isopoda: Anthuridea) to varying salinities 胚胎棘鱼对不同盐度的反应。(等足目:蚁总科
Chesapeake Science Pub Date : 1976-09-01 DOI: 10.2307/1351193
B. J. Kelley, W. D. Burbanck
{"title":"Responses of embryonic Cyathura polita (stimpson) (Isopoda: Anthuridea) to varying salinities","authors":"B. J. Kelley, W. D. Burbanck","doi":"10.2307/1351193","DOIUrl":"https://doi.org/10.2307/1351193","url":null,"abstract":"The salinity responses of the embryonic stages of the isopodCyathura polita have been studied. The development of cleaving eggs and embryos from the two cell stage through juveniles leaving the marsupium was observed in salinities of 0, 0.5, 10, 20, 30 and 40‰ The role of the embryonic membranes in osmoregulation was examined by various combinations of membrane removals and determinations of freezing point depressions of embryonic fluids in the various salinities. The marsupial stages are the most salinity sensitive stages in the life cycle. Normal development can proceed in water with salinities in the interval between 0 and 30‰ The vitelline and embryonic membranes osmoregulate, maintaining concentration differences in dilute and concentrated media. Membrane shedding is an osmotic process and is the developmental event most vulnerable to osmotic disruption. Fluids within the vitelline and embryonic membranes are favorable to water uptake in 0 to 20‰, but not in 30 and 40‰ After hatching, membrane-less juveniles are limited hyperosmotic regulators. The distribution ofC. polita conforms to the salinity limitations of the marsupial stages.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133414871","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: 23
Are the Chesapeake Bay waters warming up 切萨皮克湾的海水变暖了吗
Chesapeake Science Pub Date : 1976-09-01 DOI: 10.2307/1351204
D. Brady
{"title":"Are the Chesapeake Bay waters warming up","authors":"D. Brady","doi":"10.2307/1351204","DOIUrl":"https://doi.org/10.2307/1351204","url":null,"abstract":"1. \u0000 \u0000Apparently significant trends within moderately long (50-year) series of meteorological or hydrological data should be regarded with suspicion until justified on the basis of much longer term information. \u0000 \u0000 \u0000 \u0000 \u00002. \u0000 \u0000Extra efforts should be directed toward securing the continuance of routine observations at stations where long data histories are already available and where the termination of such records might be regretted at some future time. \u0000 \u0000 \u0000 \u0000 \u00003. \u0000 \u0000Mean annual air and water temperatures at different sites may be quite highly correlated even when the points of measurement are very widely separated. \u0000 \u0000 \u0000 \u0000 \u00004. \u0000 \u0000The annual average water temperature at one station close to the Chesapeake Bay appears to be normally distributed with a standard deviation of 0.7°C about a stationary overall mean value of 14.6°C. Its 1000-year departure is ±2.2°C.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116625733","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: 3
Ecology of the gastropod epifauna of eelgrass in a Virginia estuary 维吉尼亚河口大叶藻腹足类动物的生态学
Chesapeake Science Pub Date : 1976-09-01 DOI: 10.2307/1351196
G. A. Marsh
{"title":"Ecology of the gastropod epifauna of eelgrass in a Virginia estuary","authors":"G. A. Marsh","doi":"10.2307/1351196","DOIUrl":"https://doi.org/10.2307/1351196","url":null,"abstract":"Twenty-three species of gastropod molluscs, including 10 prosobranchs and 13 opisthobranchs, were collected during a 14-month period fromZostera in the lower York River, Virginia. Salinities ranged from 16.0 to 22.4 ‰ during the sampling period; temperatures ranged from 2.8 to 28.3 C. Seasonal abundance, depth distribution, and notes on the life cycles and general ecology of this epifauna are reported.Diastoma varium andCrepidula convexa occurred throughout the year and were the two most abundant species collected.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121711002","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: 27
Antibiotic resistant bacteria in Chesapeake Bay 切萨皮克湾的抗生素耐药细菌
Chesapeake Science Pub Date : 1976-09-01 DOI: 10.2307/1351201
R. Morgan, P. Guerry, R. Colwell
{"title":"Antibiotic resistant bacteria in Chesapeake Bay","authors":"R. Morgan, P. Guerry, R. Colwell","doi":"10.2307/1351201","DOIUrl":"https://doi.org/10.2307/1351201","url":null,"abstract":"Water and shellfish samples were collected in Chesapeake Bay during February and March 1975, for bacteriological analyses, which included enumeration and identification of coliform bacteria resistant to multiple antibioties. Water samples were analyzed using eosin-methylene blue (EMB) agar supplemented with antibiotics. Shellfish samples were analyzed following accepted methods for examination of shellfish for coliforms and fecal coliforms. Pure cultures were isolated and evaluated for multiple drug resistance patterns using the antibiotic disk procedure to determine susceptibility. A total of 479 multiple resistant organisms was isolated. Of these, 34 were randomly picked and identified. From a compilation of the data for all the sampling sites, a trend was noted, indicating a threefold or more increase in the number of antibiotic resistant coliforms, extending up the Bay from the Chesapeake Bay Bridge north to Baltimore Harbor. The increase in number of antibiotic resistant bacteria in the vicinity of a populated area such as Baltimore supports the hypothesis that sewage effluents have a detectable influence on the water quality of Chesapeake Bay, as measured by the presence of antibiotic resistant coliform bacteria.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122312066","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: 17
The Circulation and Salinity Distribution of the Upper Potomac Estuary 波托马克河河口上游环流与盐度分布
Chesapeake Science Pub Date : 1976-09-01 DOI: 10.2307/1351191
A. Elliott
{"title":"The Circulation and Salinity Distribution of the Upper Potomac Estuary","authors":"A. Elliott","doi":"10.2307/1351191","DOIUrl":"https://doi.org/10.2307/1351191","url":null,"abstract":"Salinity and current data from the Upper Potomac estuary have been analyzed to determine the intensity of the internal circulation. One set of data, collected during the fall of 1973, suggested that a reverse flow existed as far upstream as Maryland Point. Data taken during other periods indicated that an estuarine circulation, with a reverse flow in the lower layer, was not well developed above Morgantown. However, the net seaward flow did decrease significantly with depth at all stations below Douglas Point causing vertical shear in the mean profiles and, although there was no direct observational evidence from the measurements, it is possible that a return flow existed close to the bottom at some of the stations.","PeriodicalId":106819,"journal":{"name":"Chesapeake Science","volume":"122 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1976-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115284576","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
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