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  • 1
    Electronic Resource
    Electronic Resource
    Influence of predation on infaunal abundance in Upper Chesapeake Bay, USA (1980)
    Springer
    Marine biology 57 (1980), S. 221-235 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The importance of predators in controlling the densities of infaunal (〉0.5 mm) organisms was investigated in the mesohaline region of the Upper Chesapeake Bay (USA) using field experiments. The role of predators in controlling infaunal density and community characteristics varied with habitat type, season (i.e., predator abundance) and developmental or successional stage of the community. Few infaunal species were adversely affected by predator exclusion. Species that increased greatly in abundance in the absence of predators (e.g. Eteone heteropoda, Streblospio benedicti, Nereis succinea, and juvenile Macoma balthica and Mya arenaria) lived near the sediment-water interface and had major population pulses from fall through spring. Species whose abundances increased moderately or were not affected by predator exclusion were deeper burrowing organisms (e.g. Heteromastus filiformis and adult Mya arenaria), or were relatively small organisms (e.g. Paraprionospio pinnata, Scolecolepides viridis and Peloscolex gabriellae) whose principal predators could be other members of the infauna. Competition did not appear to be an important factor controlling infaunal density in these experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00390739
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature tolerance of embryos and larvae of five bivalve species under simulated power plant entrainment conditions: a synthesis (1983)
    Springer
    Marine biology 77 (1983), S. 271-278 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Thermal tolerance studies on three larval stages of five species of bivalve are compared: Crassostrea virginica, Mulinia lateralis, Argopecten irradians, Mercenaria mercenaria, and Spisula solidissima. Experiments were designed to simulate possible larval entrainment in the cooling systems of power plants and involved an 11 (temperature)x8(time-exposure) experimental matrix. Temperatures ranged from about 17.4° to 43°C at approximately 2C° intervals, and exposure times ranged from 1 min to 6 h (sometimes longer in the case of C. virginica). For all species, larval mortality generally increased with increasing exposure temperature and with increased time-exposure at any one temperature. In some species (M. mercenaria and A. irradians), a cold-shock was also apparent (i.e. increased mortality at temperatures below those at which the larvae were spawned). In the case of A. irradians, this effect was more noticeable at the trochophore stage than at the other two stages, although for all species investigated, there was a general trend of decreased thermal sensitivity with increasing age. Despite some interspecies variability from temperature to temperature and from stage to stage, S. solidissima was the most sensitive species and A. irradians was intermediate in thermal tolerance between this and the other three species. At temperatures as high as 40°–41°C, straight hinge M. mercenaria and C. virginica sustained low mortality for more than 2 h and on this basis were judged to be the most “temperature-shock” resistant of all larvae investigated. However, younger stages showed no significant differences between M. mercenaria, C. virginica or M. lateralis, and we conclude that these three species are generally very similar in their larval resistance to thermal increase. All three are more euryhaline than are the remaining two polyhaline or marine species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395816
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  • 3
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    Influence of predation on infaunal abundance in Upper Chesapeake Bay, USA (1980)
    Springer
    Details
    Publication Date: 1980-01-01
    Print ISSN: 0025-3162
    Electronic ISSN: 1432-1793
    Topics: Biology
    Published by Springer
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  • 4
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    Temperature tolerance of embryos and larvae of five bivalve species under simulated power plant entrainment conditions: a synthesis (1983)
    Springer
    Details
    Publication Date: 1983-01-01
    Print ISSN: 0025-3162
    Electronic ISSN: 1432-1793
    Topics: Biology
    Published by Springer
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  • 5
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    Regional energetic coupling of man and his environment: Data requirements (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: An energy analysis methodology was developed to serve as a rational basis for evaluating alternative regional management/use schemes. Human and natural systems are coupled and can be interpreted, using a common base of energy-flow analysis to evaluate past, present, and future states of regional integrated systems in the coastal zone and to provide the capability for rational selection of alternative patterns of resource use. Energy flows (or flows of dollars or materials converted to energy equivalents) are believed to be the basic factor in the organizations of all types of systems. An analysis example is provided of an estuarine subsystem of the Chesapeake Bay, and tabular listings of regional data needs are given. Current remote sensing capabilities were used to provide some of the necessary information.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center Appl. of Remote Sensing to the Chesapeake Bay Reg.; p 157-175
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Power Plants: Effects of Chlorination on Estuarine Primary Production (1970)
    American Association for the Advancement of Science
    Details
    Publication Date: 1970-07-10
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science
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  • 7
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    Fecundity estimates for Maryland Striped Bass (2021)
    University of Maryland Center for Environmental Science | Solomons, MD
    In:  http://aquaticcommons.org/id/eprint/6719 | 130 | 2011-11-15 12:19:43 | 6719 | University of Maryland Center for Environmental Science. Chesapeake Biological Laboratory
    Details
    Publication Date: 2021-06-26
    Description: Contemporary striped bass population modeling efforts on coastal stocks point to a reduced population fecundity in Chesapeake Bay being partially responsible for declining reproduction (Anonymous 1985; Boreman and Goodyear 1984). Fecundity values used in these models were based on earlier work by jackson and tiller (1952), lewis and Bonner (1966), Hollis (1967) and Holland and Yelverton (1973). An important feature to the Boreman and Goodyear (1985) model (FSIM) is an accurate determination of the fecundity weight regression equation used to determine the rate of egg deposition over time. Egg deposition models in turn can be used to determine how reproductive potential is changing over time in response to various management actions, i.e. reducing fishing mortality rates. thus it is imperative to follow population stock structure in the Bay system and to develop a contemporary fecundity relationship for striped bass. This report deals with the gonadal material collected in 1986 and 1987 from a coordinated Maryland field program. Samples were obtained from drift gill net collections during the spawning season from four localities: Potomac Estuary, Upper Bay, Chesapeake and Delaware Canal, and the Choptank Estuary (Figure 1).
    Description: Maryland Department of Natural Resources, Tidewater Administration
    Keywords: Conservation ; Ecology ; Fisheries ; Management ; Chesapeake Bay ; Choptank ; Potomac ; fecundity ; gill net ; managment ; model ; striped bass ; gut contents ; otoliths ; aging ; ovary ; gonadal tissue ; eggs
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
    Format: 26
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  • 8
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    An Analysis of 1974 Striped Bass spawning success in the Potomac Estuary. (2021)
    Academic Press | New York
    In:  http://aquaticcommons.org/id/eprint/1997 | 130 | 2010-12-14 16:47:36 | 1997
    Details
    Publication Date: 2021-07-11
    Description: ABSTRACT: The Potomac River Fisheries Program is concerned with the longterm effects of power plant ichthyoplankton entrainment on striped bass(hforone smatilis) recruitment. Since striped bass population fluctuations are determined strongly by environmental conditions during spawning and early development, assessment of power plant-induced ichthyoplankton mortalities must consider the mechanisms controlling spawning success. Ichthyoplankton distributions for 1974, spawning population abundance and fecundity, and environmental conditions were considered for analysis. Loss of the early part of the spawn (including the peak) accounted for the highest mortalities among ichthyoplankton. This was due to the proximity of these distributions to the salt wedge where transport into regions un!ivorable to survival seems to have occurred. The later, successful portion of the spawn occurred further upstream, in fresh tidal portions of the river. The sequence of events Ieading to an assessment of factors affecting ichthyoplankton surnnl are evaluated. Due to high early mortalities in ichthyoplankton, 1974 spawning success was low, and a poor yearclass is projected.
    Description: UMCES (University of Maryland Center for Environmental Science); Ref. No. 76-186 UMCES (University of Maryland Center for Environmental Science); Contribution No. 686
    Keywords: Management ; Fisheries ; Striped Bass ; Potomac River ; United States
    Repository Name: AquaDocs
    Type: book_section , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 151-165
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