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| 1. |
Character selection in relation to the numerical taxonomy of some male Diaspididae (Homoptera: Coccoidea) |
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Biological Journal of the Linnean Society,
Volume 12,
Issue 2,
1979,
Page 95-165
R. G. DAVIES,
K. L. BORATYŃSKI,
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摘要:
A quantitative comparison of the classifications of 24 species of male Diaspididae by principal component and principal coordinate analysis was extended to allow the comparison of classifications based on selected subsets of the 101 available characters. It was shown that subsets of 25–28 characters could be chosen numerically and used to construct classifications that resembled very closely the classification based on the reference set of characters. The conclusions are discussed in relation to other views on character‐weighting and in relation to classifications of the Diaspididae based on traditional taxonomic characters provided by the fema
ISSN:0024-4066
DOI:10.1111/j.1095-8312.1979.tb00051.x
出版商:Blackwell Publishing Ltd
年代:1979
数据来源: WILEY
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| 2. |
Lack of reproductive isolation between populations of the grasshopperMyrmeleotettix maculatusacross a steep cline in B‐chromosome frequency |
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Biological Journal of the Linnean Society,
Volume 12,
Issue 2,
1979,
Page 167-176
C. M. BULL,
G. M. HEWITT,
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摘要:
The rapid cline in B‐chromosome frequency in populations of the grasshopperMyrmeleotettix maculatusin East Anglia, reported by Hewitt&Brown (1970), has not been satisfactorily explained. Test were made of the hypothesis that the cline represented the contact of two groups of populations with differently co‐adapted genomes, between which there was reproductive isolation. There was no evidence that females in a cage discriminated between the courtship of males from the same or the opposite side of the cline. Progeny from crosses between populations on opposite sides of the cline showed no reduced survival to hatching, survived to adulthood and had normal meiosis. Thus the evidence available does not support the hypothesis that the cline is the interface of two incompatible genomes. The problems of other models accounting for the cline are discus
ISSN:0024-4066
DOI:10.1111/j.1095-8312.1979.tb00052.x
出版商:Blackwell Publishing Ltd
年代:1979
数据来源: WILEY
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| 3. |
Tubulanus annulatus, an aposematic nemertean? |
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Biological Journal of the Linnean Society,
Volume 12,
Issue 2,
1979,
Page 177-179
PER SUNDBERG,
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PDF (141KB)
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ISSN:0024-4066
DOI:10.1111/j.1095-8312.1979.tb00053.x
出版商:Blackwell Publishing Ltd
年代:1979
数据来源: WILEY
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| 4. |
The calculating cormorants |
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Biological Journal of the Linnean Society,
Volume 12,
Issue 2,
1979,
Page 181-186
PAMELA EGREMONT,
MIRIAM ROTHSCHILD,
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摘要:
Traditional fishing with captive cormorants was observed on the Li‐Kiang River. After catching seven fish the birds were allowed to eat the eighth. Without this reward they refused to fish again. These birds could apparently count up to seve
ISSN:0024-4066
DOI:10.1111/j.1095-8312.1979.tb00054.x
出版商:Blackwell Publishing Ltd
年代:1979
数据来源: WILEY
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