Geometric morphometric differences between Panstrongylus geniculatus from field and laboratory
The finding of Panstrongylus geniculatus nymphs inside a house in northeastern Antioquia, Colombia, and the reports related to their increasing presence in homes suggest the need for surveillance methods for monitoring the invasion processes. We analyzed the morphological differences between a wild population and its laboratory descendants, using the techniques of geometric morphometry, with the idea that such differences might parallel those between sylvatic and synanthropic populations. The analyses over five generations showed differences in size but not in shape. Head size and wing size were both reduced from sylvatic to laboratory populations, but the decrease in head size occurred only up to the second generation while the decrease in wing size proceeded up to the fifth generation. In contrast, although a decrease in sexual size dimorphism has been proposed as a marker of colonization in human dwellings, we did not detect any significant loss of dimorphism between sexes of P. geniculatus over the five generations studied. We conclude that size changes may have a physiological origin in response to a change of ecotopes, but more than five generations may be required for the expression of permanent morphological markers of human dwellings colonization.
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Instituto Oswaldo Cruz, Ministério da Saúde
2002
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oai:scielo:S0074-027620020005000152002-08-30Geometric morphometric differences between Panstrongylus geniculatus from field and laboratoryJaramillo O,NicolásCastillo,DianaWolff E,Marta geometrical morphometry isometric size shape Triatominae Panstrongylus geniculatus Chagas disease The finding of Panstrongylus geniculatus nymphs inside a house in northeastern Antioquia, Colombia, and the reports related to their increasing presence in homes suggest the need for surveillance methods for monitoring the invasion processes. We analyzed the morphological differences between a wild population and its laboratory descendants, using the techniques of geometric morphometry, with the idea that such differences might parallel those between sylvatic and synanthropic populations. The analyses over five generations showed differences in size but not in shape. Head size and wing size were both reduced from sylvatic to laboratory populations, but the decrease in head size occurred only up to the second generation while the decrease in wing size proceeded up to the fifth generation. In contrast, although a decrease in sexual size dimorphism has been proposed as a marker of colonization in human dwellings, we did not detect any significant loss of dimorphism between sexes of P. geniculatus over the five generations studied. We conclude that size changes may have a physiological origin in response to a change of ecotopes, but more than five generations may be required for the expression of permanent morphological markers of human dwellings colonization.info:eu-repo/semantics/openAccessInstituto Oswaldo Cruz, Ministério da SaúdeMemórias do Instituto Oswaldo Cruz v.97 n.5 20022002-07-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762002000500015en10.1590/S0074-02762002000500015 |
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Jaramillo O,Nicolás Castillo,Diana Wolff E,Marta |
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Jaramillo O,Nicolás Castillo,Diana Wolff E,Marta Geometric morphometric differences between Panstrongylus geniculatus from field and laboratory |
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Jaramillo O,Nicolás Castillo,Diana Wolff E,Marta |
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Jaramillo O,Nicolás |
title |
Geometric morphometric differences between Panstrongylus geniculatus from field and laboratory |
title_short |
Geometric morphometric differences between Panstrongylus geniculatus from field and laboratory |
title_full |
Geometric morphometric differences between Panstrongylus geniculatus from field and laboratory |
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Geometric morphometric differences between Panstrongylus geniculatus from field and laboratory |
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Geometric morphometric differences between Panstrongylus geniculatus from field and laboratory |
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geometric morphometric differences between panstrongylus geniculatus from field and laboratory |
description |
The finding of Panstrongylus geniculatus nymphs inside a house in northeastern Antioquia, Colombia, and the reports related to their increasing presence in homes suggest the need for surveillance methods for monitoring the invasion processes. We analyzed the morphological differences between a wild population and its laboratory descendants, using the techniques of geometric morphometry, with the idea that such differences might parallel those between sylvatic and synanthropic populations. The analyses over five generations showed differences in size but not in shape. Head size and wing size were both reduced from sylvatic to laboratory populations, but the decrease in head size occurred only up to the second generation while the decrease in wing size proceeded up to the fifth generation. In contrast, although a decrease in sexual size dimorphism has been proposed as a marker of colonization in human dwellings, we did not detect any significant loss of dimorphism between sexes of P. geniculatus over the five generations studied. We conclude that size changes may have a physiological origin in response to a change of ecotopes, but more than five generations may be required for the expression of permanent morphological markers of human dwellings colonization. |
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Instituto Oswaldo Cruz, Ministério da Saúde |
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2002 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762002000500015 |
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