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| 1. |
Natural hybrids of the African cichlid fishesTilapia spilurus nigraandT. leucosticta: a case of hybrid introgression |
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Biological Journal of the Linnean Society,
Volume 3,
Issue 2,
1971,
Page 103-146
H. Y. ELDER,
D. J. GARROD,
P. J. P. WHITEHEAD,
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摘要:
Hybridization is documented between two species of African cichlid fishes,Tilapia spilurus nigraandT. leucosticta.First discovered in a rice padi at Tebere in eastern Kenya (ostensibly stocked only withT. s. nigra), similar hybrids were later found in Lake Naivasha, Kenya (stockedinter aliawithT. s. nigraandT. leucosticta).Hybrid characters are examined individually and by summation as a hybrid index. Pond and laboratory crosses indicate that hybridization occurs readily and produces at least partially fertile hybrids. Hybrid introgression appears to be occurring in theTilapiapopulations of Lake Naivasha. Ecological features of the natural populations of both parental species and of the hybrids are examined with particular reference to habitat preferences and sex ratios.
ISSN:0024-4066
DOI:10.1111/j.1095-8312.1971.tb00173.x
出版商:Blackwell Publishing Ltd
年代:1971
数据来源: WILEY
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| 2. |
Numerical taxonomy: criticisms and critiques: Presidential address to the Systematics Association, November 1970 |
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Biological Journal of the Linnean Society,
Volume 3,
Issue 2,
1971,
Page 147-157
P. H. A. SNEATH,
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摘要:
Some recent criticisms and critiques of numerical taxonomy are reviewed, together with some of its present shortcomings. It is pointed out that most of the problems are equally severe for orthodox taxonomy, and many of them can only be investigated by numerical techniques. The reasons for the general success of numerical methods in bacterial classification are discussed. Besides bringing deeper insights into taxonomy as a whole, numerical taxonomy is entering a new and heuristic phase, which includes potential applications to the study of evolution.
ISSN:0024-4066
DOI:10.1111/j.1095-8312.1971.tb00174.x
出版商:Blackwell Publishing Ltd
年代:1971
数据来源: WILEY
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| 3. |
An explosive pollination mechanism inEriope crassipes, aBrazilian labiate |
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Biological Journal of the Linnean Society,
Volume 3,
Issue 2,
1971,
Page 159-164
R. M. HARLEY,
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摘要:
The first recorded case of an explosive pollination mechanism in the Labiatae is reported. This was discovered inEriope crassipesBenth., a frequent herb of the South and Central Brazilian savanna. Observations made on the sequence of events associated with pollination by the beeEpanthidioidesgregarium(Schrottky) are described in detail, and it is demonstrated that the whole process from flower opening to corolla fall is normally completed in a single day. Finally, the possible occurrence of this mechanism in other species ofEriope, and in related genera, is discussed.
ISSN:0024-4066
DOI:10.1111/j.1095-8312.1971.tb00175.x
出版商:Blackwell Publishing Ltd
年代:1971
数据来源: WILEY
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