Morphometric comparison of Simulium perflavum larvae (Diptera: Simuliidae) in relation to season and gender in Central Amazônia, Brazil
Number of larval instars, age structure and environmental effects on these parameters represent basic information in the study of insect population biology. When species have economic importance, this information is essential in order to choose the best period to apply different control methods and...
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Instituto Oswaldo Cruz, Ministério da Saúde
2001
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ftdoajarticles:oai:doaj.org/article:8a11066108b84d589fa892a3b71382ca 2023-05-15T15:15:58+02:00 Morphometric comparison of Simulium perflavum larvae (Diptera: Simuliidae) in relation to season and gender in Central Amazônia, Brazil Yamile B Alencar Neusa Hamada Sandra Magni-Darwich 2001-08-01T00:00:00Z https://doi.org/10.1590/S0074-02762001000600008 https://doaj.org/article/8a11066108b84d589fa892a3b71382ca EN eng Instituto Oswaldo Cruz, Ministério da Saúde http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762001000600008 https://doaj.org/toc/0074-0276 https://doaj.org/toc/1678-8060 doi:10.1590/S0074-02762001000600008 0074-0276 1678-8060 https://doaj.org/article/8a11066108b84d589fa892a3b71382ca Memórias do Instituto Oswaldo Cruz., Vol 96, Iss 6, Pp 785-789 (2001) aquatic insects black fly biometry larval instars Amazônia Arctic medicine. Tropical medicine RC955-962 Microbiology QR1-502 article 2001 ftdoajarticles https://doi.org/10.1590/S0074-02762001000600008 2023-01-08T01:26:16Z Number of larval instars, age structure and environmental effects on these parameters represent basic information in the study of insect population biology. When species have economic importance, this information is essential in order to choose the best period to apply different control methods and to determine the stages of the life cycle of the insect that are most susceptible to each treatment. The family Simuliidae has many species of medical/veterinary importance in the world, and some studies in the temperate region have suggested that the number of larval instars and the larval size can vary according to the season, gender and some environmental factors, such as temperature and diet. This study, with the zoophilic species Simulium perflavum Roubaud, is the first in the Neotropics observing some of these factors and will serve as a template for other species of medical importance in the region. S. perflavum larvae were collected in five streams in Central Amazônia (Manaus and Presidente Figueiredo counties, State of Amazonas), in Sept./Oct. 1996 (dry season) and Feb./Mar. 1997 (rainy season). These larvae were measured (lateral length of head capsule and width of cephalic apodema) to determine the number of larval instars (n=3985), to compare the larval size between seasons and genders (last and penultimate larval instars, n=200). Seven larval instars were determined for this species using frequency distributions, t-tests and Crosby´s growth rule. Significant differences were not detected (t-test, p>0.05) in larval size between seasons and genders. Our results differ from some found in temperate regions suggesting that in the Neotropical region the larval size in different seasons and different genders remains constant, although some environmental parameters, such as diet, change depending on the season. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Memórias do Instituto Oswaldo Cruz 96 6 785 789 |
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Open Polar |
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op_collection_id |
ftdoajarticles |
language |
English |
topic |
aquatic insects black fly biometry larval instars Amazônia Arctic medicine. Tropical medicine RC955-962 Microbiology QR1-502 |
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aquatic insects black fly biometry larval instars Amazônia Arctic medicine. Tropical medicine RC955-962 Microbiology QR1-502 Yamile B Alencar Neusa Hamada Sandra Magni-Darwich Morphometric comparison of Simulium perflavum larvae (Diptera: Simuliidae) in relation to season and gender in Central Amazônia, Brazil |
topic_facet |
aquatic insects black fly biometry larval instars Amazônia Arctic medicine. Tropical medicine RC955-962 Microbiology QR1-502 |
description |
Number of larval instars, age structure and environmental effects on these parameters represent basic information in the study of insect population biology. When species have economic importance, this information is essential in order to choose the best period to apply different control methods and to determine the stages of the life cycle of the insect that are most susceptible to each treatment. The family Simuliidae has many species of medical/veterinary importance in the world, and some studies in the temperate region have suggested that the number of larval instars and the larval size can vary according to the season, gender and some environmental factors, such as temperature and diet. This study, with the zoophilic species Simulium perflavum Roubaud, is the first in the Neotropics observing some of these factors and will serve as a template for other species of medical importance in the region. S. perflavum larvae were collected in five streams in Central Amazônia (Manaus and Presidente Figueiredo counties, State of Amazonas), in Sept./Oct. 1996 (dry season) and Feb./Mar. 1997 (rainy season). These larvae were measured (lateral length of head capsule and width of cephalic apodema) to determine the number of larval instars (n=3985), to compare the larval size between seasons and genders (last and penultimate larval instars, n=200). Seven larval instars were determined for this species using frequency distributions, t-tests and Crosby´s growth rule. Significant differences were not detected (t-test, p>0.05) in larval size between seasons and genders. Our results differ from some found in temperate regions suggesting that in the Neotropical region the larval size in different seasons and different genders remains constant, although some environmental parameters, such as diet, change depending on the season. |
format |
Article in Journal/Newspaper |
author |
Yamile B Alencar Neusa Hamada Sandra Magni-Darwich |
author_facet |
Yamile B Alencar Neusa Hamada Sandra Magni-Darwich |
author_sort |
Yamile B Alencar |
title |
Morphometric comparison of Simulium perflavum larvae (Diptera: Simuliidae) in relation to season and gender in Central Amazônia, Brazil |
title_short |
Morphometric comparison of Simulium perflavum larvae (Diptera: Simuliidae) in relation to season and gender in Central Amazônia, Brazil |
title_full |
Morphometric comparison of Simulium perflavum larvae (Diptera: Simuliidae) in relation to season and gender in Central Amazônia, Brazil |
title_fullStr |
Morphometric comparison of Simulium perflavum larvae (Diptera: Simuliidae) in relation to season and gender in Central Amazônia, Brazil |
title_full_unstemmed |
Morphometric comparison of Simulium perflavum larvae (Diptera: Simuliidae) in relation to season and gender in Central Amazônia, Brazil |
title_sort |
morphometric comparison of simulium perflavum larvae (diptera: simuliidae) in relation to season and gender in central amazônia, brazil |
publisher |
Instituto Oswaldo Cruz, Ministério da Saúde |
publishDate |
2001 |
url |
https://doi.org/10.1590/S0074-02762001000600008 https://doaj.org/article/8a11066108b84d589fa892a3b71382ca |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Memórias do Instituto Oswaldo Cruz., Vol 96, Iss 6, Pp 785-789 (2001) |
op_relation |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762001000600008 https://doaj.org/toc/0074-0276 https://doaj.org/toc/1678-8060 doi:10.1590/S0074-02762001000600008 0074-0276 1678-8060 https://doaj.org/article/8a11066108b84d589fa892a3b71382ca |
op_doi |
https://doi.org/10.1590/S0074-02762001000600008 |
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Memórias do Instituto Oswaldo Cruz |
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96 |
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6 |
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