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  • Springer  (297)
  • 1980-1984  (297)
Collection
Keywords
Publisher
Years
Year
  • 11
    Electronic Resource
    Electronic Resource
    Predatory control of copepod seasonal cycles on Georges Bank (1984)
    Springer
    Marine biology 82 (1984), S. 31-40 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A stimulation model of copepod population dynamics (development rate, fecundity, and mortality) was used to compute the predatory consumption necessary to control population growth in three dominant copepod species (Pseudocalanus sp., Paracalanus parvus, and Calanus finmarchicus) on Georges Bank, given observed seasonal cycles of copepod and predator populations. The model also calculated secondary production of each species. Copepod development rate and fecundity were functions of temperature while mortality was a function of predator abundance and consumption rate. Daily inputs of temperature and predator abundance (chaetognaths, ctenophores, and Centropages spp.) were derived from equations fit to field data. Model runs were made with various consumption rates until the model output matched observed copepod seasonal cycles. Computed consumption rates were low compared with published values from field and laboratory studies indicating that, even at conservative estimates of consumption, predators are able to control these copepod populations. Combined annual secondary production by the small copepod species, Pseudocalanus sp. and P. parvus, was nearly twice that of the larger C. finmarchicus with P. parvus having the highest total annual production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392761
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  • 12
    Electronic Resource
    Electronic Resource
    Gene flow among population of a teleost (painted greenling, Oxylebius pictus) from Puget Sound to southern California (1981)
    Springer
    Marine biology 65 (1981), S. 17-23 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Four geographic populations of the painted greenling Oxylebius pictus, a small cryptic reef fish of the western coast of North America, were examined for biochemical evidence of genetic differentiation. Painted greenlings in Puget Sound and those in central and southern California are similar by Nei's genetic identity (I=0.966 to 0.995); Fowever, other observations argue for genetic differentiation among the 4 populations. First, there are geographic differences in allelic frequencies at two loci (Est-3 and Pgm), with a geographic cline exhibited at the latter locus. Second, and most significant, two assayable loci are uniquely present in pairs of populations below Point Conception (G3pdh-3) and above Point Conception (Idh-3), respectively. Larval dispersal patterns are inferred from breeding times for the painted greenling and on patterns of currents off the western coast of North America. We believe that gene flow in this species is less across Point Conception than between Puget Sound, Washington, and Monterey, California, on the basis of these genetic data and the patterns of dispersal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397063
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  • 13
    Electronic Resource
    Electronic Resource
    Infaunal benthos of a natural petroleum seep: Study of community structure (1980)
    Springer
    Marine biology 59 (1980), S. 31-41 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract At 8 wk intervals, from December 1975 through March 1978, we took a census of the infaunal benthic invertebrates at a natural petroleum seep near Santa Barbara, California, USA and at an area nearby where no fresh petroleum occurred in the sediments. Both sites had in common 72% of the populations representing over 90% of the individuals, strongly suggesting that the two sites are part of the same community. At the petroleum seep there were higher densities of individuals in many populations (∼60%), but no dramatic difference in diversity (Shannon-Wiener or dominance-diversity). The seep populations tended to be more variable from one sampling period to the next, possibly due, at least in part, to large larval settlements there. The most abundant populations at the seep site were dominated by deposit feeders (14 of the 15 species considered), especially oligochaetes which are extremely rare at the comparison site. The discussion includes a hypothesis of trophic enrichment of the seep populations by bacterial growth stimulated by fresh petroleum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396980
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  • 14
    Electronic Resource
    Electronic Resource
    Man-made structures on marine sediments: Effects on adjacent benthic communities (1982)
    Springer
    Marine biology 70 (1982), S. 295-303 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This study (1975–1977) examines the effect of man-made structures on natural sand bottom communities in shallow water in San Diego County, southern California, USA. While there were shallow scour effects to 15 m around some artificial reefs, the reefs had no measurable effect on sand ripple patterns, grain size, organic carbon or infauna beyond the scoured areas. Foraging by reef-associated fishes produced profound alterations in the epifauna populations of the sea pen Stylatula elongata. The sea pen densities were 4 to 10 m-2 before the reefs were established, but within 5 mo were eliminated from distances greater than 200 m around the reefs. On the other hand, densities of the tube-building polychaetes Diopatra spp. seemed to be enhanced in the immediate vicinity of the artificial reef. Oil platforms and bridge pilings seem to have much more profound effects on the nearby sand communities than do the relatively small artificial reefs. In addition to the elimination of sea pens, Diopatra spp. densities increased from 〈1.0 m-2 in control areas to as many as 73 m-2 in the vicinity of oil platforms. Grain size and infauna were strongly affected by the oil platform.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396848
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  • 15
    Electronic Resource
    Electronic Resource
    Food concentrations on Georges Bank: non-limiting effect on development and survival of laboratory reared Pseudocalanus sp. and Paracalanus parvus (Copepoda: Calanoida) (1984)
    Springer
    Marine biology 82 (1984), S. 41-46 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Laboratory and field studies were used to show that development rate and survival of the copepods Pseudocalanus sp. and Paracalanus parvus are generally not food limited on Georges Bank. Copepods were reared in the laboratory at a series of phytoplankton concentrations (25 to 200 μg carbon l-1) spanning the range of particulate carbon and nitrogen measured on Georges Bank in October, 1978 and February, 1979. Pseudocalanus sp. and P. parvus were reared at 5° and 12°C, respectively. Development rate and survival in both species were not affected at Georges Bank food concentrations but were reduced at lower food levels. Development times from hatching to adulthood was 60 to 70 d for Pseudocalanus sp. and 25 to 30 d for P. parvus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392762
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  • 16
    Electronic Resource
    Electronic Resource
    Dependence of dissolved carbohydrate concentrations upon small scale nanoplankton and bacterioplankton distributions in the western Sargasso Sea (1981)
    Springer
    Marine biology 65 (1981), S. 289-296 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Significant correlations between trophic components of the 〈20 μm microbial plankton and the concentrations of total dissolved carbohydrate (TCHO) and polysaccharide (PCHO) have been found at two drogued buoy stations which were sampled at 3 or 4-h intervals over diel cycles. An attempt was made to sample on two pre-selected isotherms (approximating isopycnals) at each station. Significant inverse correlations of TCHO and of PCHO with numbers of phototrophic nanoplankton (PNAN) were found along both isotherms at a station off the Carolina coast. Off central Florida, TCHO and/or PCHO were significant multiple linear functions of PNAN, heterotrophic bacterioplankton (BAC) and sometimes heterotrophic nanoplankton (HNAN) counts. Partial regression coefficients for PNAN were always negative and those for HNAN were positive. Inverse trends dominated the relations of BAC with PCHO and TCHO. The combined data from the two stations (300 nautical miles apart) produced very similar multiple linear relations. This suggests that the observed relationships are real, resulting from general physiological processes and interactions of the microbial plankton groups rather than from chance occurrences at a particular station, and that the combined activities of the 〈20 μm plankton actively regulate dissolved carbohydrate concentrations in the Sargasso Sea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397124
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  • 17
    Electronic Resource
    Electronic Resource
    A pressure-retaining deep ocean sampler and transfer system for measurement of microbial activity in the deep sea (1981)
    Springer
    Microbial ecology 7 (1981), S. 51-65 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A deep ocean sampler (DOS) has been developed for microbiological sampling and is capable of aseptically collecting 400-ml water samples from any depth in the world oceans. The instrument maintains samples under in situ pressure and temperature. A hyperbaric transfer system has also been developed, enabling transfer of sample volumes up to 150 ml, without decompression or dilution, to pressurized incubation chambers. Utilization of14C-glutamate (21 to 96μg/l) and14C-acetate (4.6μg/l) by microbial populations in undecompressed water samples from the N.W. Atlantic and the Cape and Angola Basins was recorded over incubation periods of 2 to 18 weeks. Rates of substrate utilization ranged from 1 to 38×10−2 μg/l/day.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02010478
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  • 18
    Electronic Resource
    Electronic Resource
    Book reviews (1980)
    Springer
    Immunogenetics 10 (1980), S. 509-511 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01572585
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  • 19
    Electronic Resource
    Electronic Resource
    Book reviews (1980)
    Springer
    Immunogenetics 10 (1980), S. 615-617 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01572597
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  • 20
    Electronic Resource
    Electronic Resource
    Ten new monoclonal antibodies detecting antigenic determinants on class I H-2 molecules (1981)
    Springer
    Immunogenetics 14 (1981), S. 177-180 
    Details
    ISSN: 1432-1211
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00344311
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