Differences in biological characteristics of two strains of the cestode Hymenolepis diminuta
SUMMARY Biological characteristics of infectivity, growth rate and fecundity of Hymenolepis diminuta isolated from wild Rattus rattus in Japan were compared with parasites of Texas origin maintained for several generations in this and many other laboratories in laboratory bred Rattus norvegicus. The...
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Language: | English |
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Cambridge University Press (CUP)
1987
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Online Access: | http://dx.doi.org/10.1017/s0031182000057589 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0031182000057589 |
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crcambridgeupr:10.1017/s0031182000057589 2024-03-03T08:48:27+00:00 Differences in biological characteristics of two strains of the cestode Hymenolepis diminuta Kino, H. Kennedy, C. R. 1987 http://dx.doi.org/10.1017/s0031182000057589 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0031182000057589 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Parasitology volume 95, issue 1, page 97-110 ISSN 0031-1820 1469-8161 Infectious Diseases Animal Science and Zoology Parasitology journal-article 1987 crcambridgeupr https://doi.org/10.1017/s0031182000057589 2024-02-08T08:40:06Z SUMMARY Biological characteristics of infectivity, growth rate and fecundity of Hymenolepis diminuta isolated from wild Rattus rattus in Japan were compared with parasites of Texas origin maintained for several generations in this and many other laboratories in laboratory bred Rattus norvegicus. The timing of development and maturation was similar in parasites from both sources, but the mean parasite dry weight was less and the mean egg production lower in Japanese parasites in both single and multiple infections. The differences persisted over 10 weeks in single infections, and were unaffected by rat strain. In all experiments there was much greater variation and heterogeneity in the biological characteristics of the Japanese parasites. It was concluded that the Texas parasites were better adapted to R. norvegicus and in the course of adaptation had become more homogeneous, and that the difference between the parasite strains had a complex genetic basis. Some Japanese parasites of the early isolated generations failed to produce normal eggs, but the proportion of these decreased in later generations. However, selected individual Japanese parasites whose egg production was equal to that of parasites of Texas origin did not produce offspring of larger mean size or higher mean fecundity, and heterogeneity of these characteristics was maintained. In the intermediate host, the mean number of cysticercoids of the Japanese isolate per beetle was higher than that of the Texas strain in Tribolium confusum but lower in Tenebrio molitor. The greater heterogeneity exhibited by Japanese parasites and the genetic basis of the strain difference are discussed with particular reference to geographical isolation, differences in definitive hosts and co-evolution of wild and laboratory host and parasite populations. Article in Journal/Newspaper Rattus rattus Cambridge University Press Parasitology 95 1 97 110 |
institution |
Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Infectious Diseases Animal Science and Zoology Parasitology |
spellingShingle |
Infectious Diseases Animal Science and Zoology Parasitology Kino, H. Kennedy, C. R. Differences in biological characteristics of two strains of the cestode Hymenolepis diminuta |
topic_facet |
Infectious Diseases Animal Science and Zoology Parasitology |
description |
SUMMARY Biological characteristics of infectivity, growth rate and fecundity of Hymenolepis diminuta isolated from wild Rattus rattus in Japan were compared with parasites of Texas origin maintained for several generations in this and many other laboratories in laboratory bred Rattus norvegicus. The timing of development and maturation was similar in parasites from both sources, but the mean parasite dry weight was less and the mean egg production lower in Japanese parasites in both single and multiple infections. The differences persisted over 10 weeks in single infections, and were unaffected by rat strain. In all experiments there was much greater variation and heterogeneity in the biological characteristics of the Japanese parasites. It was concluded that the Texas parasites were better adapted to R. norvegicus and in the course of adaptation had become more homogeneous, and that the difference between the parasite strains had a complex genetic basis. Some Japanese parasites of the early isolated generations failed to produce normal eggs, but the proportion of these decreased in later generations. However, selected individual Japanese parasites whose egg production was equal to that of parasites of Texas origin did not produce offspring of larger mean size or higher mean fecundity, and heterogeneity of these characteristics was maintained. In the intermediate host, the mean number of cysticercoids of the Japanese isolate per beetle was higher than that of the Texas strain in Tribolium confusum but lower in Tenebrio molitor. The greater heterogeneity exhibited by Japanese parasites and the genetic basis of the strain difference are discussed with particular reference to geographical isolation, differences in definitive hosts and co-evolution of wild and laboratory host and parasite populations. |
format |
Article in Journal/Newspaper |
author |
Kino, H. Kennedy, C. R. |
author_facet |
Kino, H. Kennedy, C. R. |
author_sort |
Kino, H. |
title |
Differences in biological characteristics of two strains of the cestode Hymenolepis diminuta |
title_short |
Differences in biological characteristics of two strains of the cestode Hymenolepis diminuta |
title_full |
Differences in biological characteristics of two strains of the cestode Hymenolepis diminuta |
title_fullStr |
Differences in biological characteristics of two strains of the cestode Hymenolepis diminuta |
title_full_unstemmed |
Differences in biological characteristics of two strains of the cestode Hymenolepis diminuta |
title_sort |
differences in biological characteristics of two strains of the cestode hymenolepis diminuta |
publisher |
Cambridge University Press (CUP) |
publishDate |
1987 |
url |
http://dx.doi.org/10.1017/s0031182000057589 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0031182000057589 |
genre |
Rattus rattus |
genre_facet |
Rattus rattus |
op_source |
Parasitology volume 95, issue 1, page 97-110 ISSN 0031-1820 1469-8161 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0031182000057589 |
container_title |
Parasitology |
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95 |
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1 |
container_start_page |
97 |
op_container_end_page |
110 |
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1792505318142377984 |