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  • 1
    Electronic Resource
    Electronic Resource
    Reciprocal egg trading and brood care in a hermaphroditic polychaete worm
    Amsterdam : Elsevier
    Animal Behaviour 33 (1985), S. 938-944 
    Details
    ISSN: 0003-3472
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0003-3472(85)80028-2
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reciprocal egg trading and brood care in a hermaphroditic polychaete worm
    Amsterdam : Elsevier
    Animal Behaviour 33 (1985), S. 938-944 
    Details
    ISSN: 0003-3472
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0003-3472(85)80028-2
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Inheritance, maternal influence and biochemical analysis of an egg color polymorphism inOphryotrocha diadema (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 97-98 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the Polychaete wormOphryotrocha diadema, the yellow coloration of egg yolk is due to the selective uptake of lutein from food. The genetic control of this mechanism depends on a single locus with 2 alleles, the dominantY (yellow) allele, and the recessivey (absence of coloration) allele.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01960650
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Chromosomal nucleolar organizer region (NOR) phenotypes in nine species of the genus Ophryotrocha (Polychaeta: Dorvilleidae) (1995)
    Springer
    Marine biology 124 (1995), S. 425-433 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Chromosomal nucleolar organizer region (NOR) phenotypes have been characterized in nine species of the genus Ophryotrocha (Polychaeta: Dorvilleidae), namely O. notoglandulata, O. sp. macrovifera, O. sp. labronica pacifica, O. labronica labronica, O. puerilis puerilis, O. diadema, O. sp. robusta, O. gracills and O. hartmanni. Irrespective of chromosome number and morphology, Ag positive regions were terminally located in all but one species, O. diadema, where the NORs were pericentromerical in a metacentric pair. The presence of a single chromosome pair bearing NOR in invertebrates is considered an ancestral trait. According to this assumption, O. sp. robusta, O. dialema, and perhaps O. p. puerilis appear to be more ancestral than the other species. On the contrary, O. notoglandulaia, O. sp. macrovifera, O. sp. labronica oacifica, with two chromosomal pairs bearing NOR sites, seem to represent examples of further evolution within the genus Ophryotrocha.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00363916
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Genetic divergence among three sympatric species of Mediterranean Patella (Archaeogastropoda) (1993)
    Springer
    Marine biology 115 (1993), S. 401-405 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Patella caerulea L., P. aspera Lam. (=P. ulyssiponensis Gmelin). P. rustica L. (=P. lusitanica Gmelin) are coexisting Mediterranean species of the genus Patella. P. caerulea and P. rustica have a haploid complement of n=9 with seven metacentric and two telocentric chromosomes, while P. aspera has a haploid complement of n=8 without telocentric chromosomes. To better define the phylogenetic relationships among these three species, an electrophoretic analysis of 12 enzyme coding loci was performed on samples of the three species collected from Laigueglia (Liguria, Italy) in 1989. On the whole, genotypic frequencies were in agreement with Hardy-Weinberg expectations and no significant differences were observed among the populations of the three species as far as their genetic structure is concerned. Nearly 50% of the sampled loci were diagnostic. Nei's genetic distance was 0.82 between P. caerulea and P. aspera, 0.97 between P. aspera and P. rustica and 0.94 between P. caerulea and P. rustica. By greatly separating P. rustica from the other two species, results of the electrophoretic analysis are consistent with the traditional view, which regards P. aspera and P. caerulea as more closely related than P. rustica on the basis of radular teeth morphology. Using genetic distances and the assumptions of the molecular clock, lineages leading to P. aspera and to P. caerulea may have diverged from the stem common to P. rustica ca. 18 million years ago.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349838
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Chromosome analysis of three species of Patella (Archaeogastropoda) (1988)
    Springer
    Genetica 77 (1988), S. 97-103 
    Details
    ISSN: 1573-6857
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Differences in karyotypic structure are compared with reported isozyme differences in three Mediterranean species of Patella. In addition, the karyotypic structure of Patella is discussed in terms of the karyotypic variability of Archaeogastropoda. Both P. lusitanica and P. caerulea have a haploid complement of n=9 (6 metacentric, 1 submetacentric, 1 subtelocentric, 1 telocentric chromosome in P. lusitanica and 6 metacentric, 1 submetacentric, 2 telocentric chromosome in P. caerulea). P. aspera, although regarded as morphologically more closely related to P. caerulea, has a haploid complement of only n=8 (7 metacentric and 1 submetacentric chromosomes).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00057759
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    Paper (German National Licenses)
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