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  • QTL  (3)
  • BALB/cBy  (2)
  • copepods  (2)
  • Springer  (5)
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  • Springer  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    The role of copepods in the planktonic ecosystems of mixed and stratified waters of the European shelf seas (1994)
    Springer
    Hydrobiologia 292-293 (1994), S. 521-530 
    Details
    ISSN: 1573-5117
    Keywords: Plankton ; copepods ; ecosystem ; biomass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The European shelf seas can be divided into regions which have tidally mixed waters and thermally stratified waters. The tidally mixed near shore environments support zooplankton communities dominated by smaller copepods and having large meroplankton contributions. These small copepods (Centropages spp., Temora spp., Acartia spp., Paral Pseudo/Microcalanus spp.) together with the microzooplankton component form a different and more complex food web than the larger copepod/diatom link associated with thermally stratified waters. The copepods Calanus finmarchicus and C. helgolandicus account for over 90% of the copepod dry weight biomass in stratified waters. Although occurring in lower numbers in mixed waters they can still make significant contributions to the biomass. A 31 year time series from the European shelf shows the inter- and intea-annual variability of these species. The basic biology and food web that these two systems support, and the transfer of energy, can result in marked differences in quantity and quality of particulates available as food for fish larvae. Calanus dominated systems allow the primary production to be directed straight through the trophic food chain (diatoms/Calanus/fish larvae) while the near shore communities of smaller copepods limit the amount of energy being transferred to the higher trophic levels. Eighty-two Longhurst Hardy Plankton Recorder hauls were used as the data base for this study. In all cases the zooplankton was dominated by copepods both in numbers and biomass accounting for 〉 80% of total zooplankton dry weight in the Irish Sea, Celtic Sea, shelf edge of the Celtic Sea and the northern and southern North Sea in Spring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229980
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  • 2
    Electronic Resource
    Electronic Resource
    A Quantitative Genetic Analysis of Slow-Wave Sleep in Influenza-Infected CXB Recombinant Inbred Mice (1999)
    Springer
    Behavior genetics 29 (1999), S. 339-348 
    Details
    ISSN: 1573-3297
    Keywords: Sleep ; influenza ; virus ; recombinant inbred ; C57BL/6 ; BALB/cBy ; QTL
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Influenza-infected C57BL/6J mice spend increased amounts of time in slow-wave sleep (SWS) during the dark phase of the circadian cycle compared to healthy mice. In contrast, infected BALB/cByJ mice show a normal or reduced time in SWS, particularly during the light phase. To identify genetic loci with linkage to these traits, we measured sleep in 13 CXB recombinant inbred (RI) strains derived from a cross between C57BL/6ByJ and BALB/cByJ mice. The probability density distribution of sleep patterns of influenza-infected CXB RI mice showed modes that correspond roughly with the parental modes during the dark phase of the circadian cycle and are intermediate or C57BL/6-like during the light phase. These patterns are consistent with the presence of a low number of major effect quantitative trait loci (QTLs). Chromosomal regions with provisional association to strain variation in influenza-induced SWS patterns were identified. In particular, a 10- to 12-cM interval on Chr 6 between D6Mit74 and D6Mit188 contains a QTL (LRS = 16.6 at 1 cM proximal to D6Mit316; genomewide p〈.05) that influences the SWS response to influenza infection during the light phase. We have provisionally named this QTL Srilp1 (sleep response to influenza, light phase 1). Candidate genes for mediation of this phenotype include Ghrhr (growth hormone releasing hormone receptor), Crhr2 (corticotropin releasing hormone receptor 2), and Cd8a (an epitope on cytotoxic T lymphocytes). Several other intervals achieved suggestive probability scores that are sufficient to warrant further analysis either with additional RI strains or with F2 panels. The analysis also suggests that dark phase and light phase responses are regulated by different genetic factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021661901196
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  • 3
    Electronic Resource
    Electronic Resource
    Spatial heterogeneity and niche differentiation in oceanic zooplankton (1988)
    Springer
    Hydrobiologia 167-168 (1988), S. 151-159 
    Details
    ISSN: 1573-5117
    Keywords: copepods ; vertical distribution ; seasonal abundance ; niche
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The annual mean abundance (1958 to 1986) and geographical distributions of four of the major biomass species of copepod in the northern North Atlantic Ocean are shown together with their seasonal vertical distributions (1971 to 1974) from Ocean Weather Station I. The arcticboreal species Euchaeta norvegica and Calanus finmarchicus have sympatric distributions with their maximum numerical abundance in the cold water current system between Labrador and Greenland. The distribution of the temperate species Pleuromamma robusta and Metridia lucens are allopatric with respect to the two previous species but have sympatric distributions centering around the north-eastern oceanic region. The four species dominate the copepod biomass of the oceanic epiplankton and minimise interspecific competition by a) seasonal displacement of their main reproductive periods, b) occupying different trophic levels, c) having diverse reproductive strategies, d) residing in different positions in the water column and e) having different migratory behaviour throughout the year. The vertical distributions and migratory behaviour of these four copepods suggest a highly structured community with individual species occupying distinct niches with minimum overlap between competitors; even though the vertical distributions of the species are constantly changing through diel, ontogenetic and seasonal migrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026301
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  • 4
    Electronic Resource
    Electronic Resource
    A Quantitative Genetic Analysis of Locomotor Activity in CXB Recombinant Inbred Mice (1999)
    Springer
    Behavior genetics 29 (1999), S. 319-328 
    Details
    ISSN: 1573-3297
    Keywords: Recombinant inbred mice ; circadian ; locomotor activity ; QTL ; C57BL/6J ; BALB/cByJ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Recent studies have identified genes that influence the length of the circadian period maintained by mice housed under constant lighting conditions. However, a less studied circadian activity variable is the amplitude of daily oscillations in locomotor activity. This parameter reflects spontaneous activity exhibited under standard lighting and housing conditions and, therefore, differs conceptually from assessments of exploratory or open-field activity, voluntary wheel-running, or circadian period during exposure to constant light or constant darkness conditions. We recently observed a greater daily amplitude of oscillation in spontaneous locomotor activity in C57BL/6 mice compared to BALB/cBy mice. To identify genetic loci with potential linkage to circadian variation in the amount of locomotor activity, we measured the spontaneous activity of 13 CXB recombinant inbred (RI) strains of mice. The probability density distributions of locomotor activity phenotypes for the 13 CXB RI strains were consistent with the presence of a low number of major quantitative trait loci affecting this trait. Regions of chromosomes 3, 8, 12, 13, and 19 showed provisional linkage to strain variation in locomotor activity. Probabilities of linkage were not sufficient for declaration of an activity-related quantitative trait locus but were sufficient to warrant further analysis either with additional RI strains or with F2 panels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021657800287
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  • 5
    Electronic Resource
    Electronic Resource
    A Quantitative Genetic Analysis of Slow-Wave Sleep and Rapid-Eye Movement Sleep in CXB Recombinant Inbred Mice (1999)
    Springer
    Behavior genetics 29 (1999), S. 329-337 
    Details
    ISSN: 1573-3297
    Keywords: Sleep ; REM sleep ; mice ; recombinant inbred ; QTL ; BALB/cBy ; C57BL/6
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Psychology
    Notes: Abstract Various inbred strains of mice show different daily amounts of slow-wave sleep (SWS) and rapid-eye movement sleep (REMS), suggesting the possibility of genetic influences on sleep propensity. Previous work by others studying the spontaneous sleep patterns of seven strains of CXB recombinant inbred (RI) mice suggested several candidate quantitative trait loci (QTLs) associated with variation in REMS. Extending this approach, we evaluated the sleep patterns of 13 CXB RI strains and conducted linkage analyses based on 223 discrete informative loci. The probability density distribution of light phase REMS for the CXB RI strains showed deflections that correspond approximately to the parental phenotypes. This type of pattern is consistent with the presence of a low number of major effect quantitative trait loci. Regions of chromosomes 4, 16, and 17 showed provisional linkage to strain variation in REMS. The distribution of loci further suggested that dark phase and light phase REMS may be regulated by different genetic factors. Probabilities of linkage were not sufficient for declaration of a quantitative trait locus for REMS but were sufficient to warrant further analysis either with additional RI strains or with F2 panels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1021609917126
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