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Registro Completo |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
08/05/2013 |
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Data da última atualização: |
18/05/2017 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SILVA, F. W. S.; VIOL, D. L.; FARIA, S. V.; LIMA, E.; VALICENTE, F. H.; ELLIOT, S. L. |
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Afiliação: |
FERNANDO HERCOS VALICENTE, CNPMS. |
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Título: |
Two's a crowd: phenotypic adjustments and prophylaxis in anticarsia gemmatalis larvae are triggered by the presence of conspecifics. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
Plos One, San Francisco, v. 8, n. 4, p. 1-10, 2013. |
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DOI: |
10.1371/journal.pone.0061582 |
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Idioma: |
Inglês |
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Conteúdo: |
Defence from parasites and pathogens involves a cost. Thus, it is expected that organisms use this only at high population densities, where the risk of pathogen transmission may be high, as proposed by the "density-dependent prophylaxis" (DDP) hypothesis. These predictions have been tested in a wide range of insects, both in comparative and experimental studies. We think it pertinent to consider a continuum between solitarious and gregarious living insects, wherein: (1) solitarious insects are those that are constitutively solitary and do not express any phenotypic plasticity, (2) the middle of the continuum is represented by insects that are subject to fluctuations in local density and show a range of facultative and plastic changes; and (3) constitutively gregarious forms live gregariously and show the gregarious phenotype even in the absence of crowding stimuli. We aimed to chart some of the intermediary continuum with an insect that presents solitarious aspects, but that is subject to fluctuations in density. Thus, Anticarsia gemmatalis (Lepidoptera: Noctuidae) larvae reared at higher densities showed changes in coloration, a greater degree of encapsulation, had higher hemocyte densities and were more resistant to Baculovirus anticarsia, but not to Bacillus thuringiensis. Meanwhile, with increased rearing density there was reduced capsule melanization. Hemocyte density was the only variable that did not vary according to larval phenotype. The observed responses were not a continuous function of larval density, but an all-or-nothing response to the presence of a conspecific. As A. gemmatalis is not known for gregarious living, yet shows these density-dependent changes, it thus seems that this plastic phenotypic adjustment may be a broader phenomenon than previously thought. MenosDefence from parasites and pathogens involves a cost. Thus, it is expected that organisms use this only at high population densities, where the risk of pathogen transmission may be high, as proposed by the "density-dependent prophylaxis" (DDP) hypothesis. These predictions have been tested in a wide range of insects, both in comparative and experimental studies. We think it pertinent to consider a continuum between solitarious and gregarious living insects, wherein: (1) solitarious insects are those that are constitutively solitary and do not express any phenotypic plasticity, (2) the middle of the continuum is represented by insects that are subject to fluctuations in local density and show a range of facultative and plastic changes; and (3) constitutively gregarious forms live gregariously and show the gregarious phenotype even in the absence of crowding stimuli. We aimed to chart some of the intermediary continuum with an insect that presents solitarious aspects, but that is subject to fluctuations in density. Thus, Anticarsia gemmatalis (Lepidoptera: Noctuidae) larvae reared at higher densities showed changes in coloration, a greater degree of encapsulation, had higher hemocyte densities and were more resistant to Baculovirus anticarsia, but not to Bacillus thuringiensis. Meanwhile, with increased rearing density there was reduced capsule melanization. Hemocyte density was the only variable that did not vary according to larval phenotype. The observed responses were not ... Mostrar Tudo |
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Thesagro: |
Inseto; Patógeno. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/82566/1/Two-crowd.pdf
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Marc: |
LEADER 02483naa a2200217 a 4500
001 1957410
005 2017-05-18
008 2013 bl uuuu u00u1 u #d
024 7 $a10.1371/journal.pone.0061582$2DOI
100 1 $aSILVA, F. W. S.
245 $aTwo's a crowd$bphenotypic adjustments and prophylaxis in anticarsia gemmatalis larvae are triggered by the presence of conspecifics.$h[electronic resource]
260 $c2013
520 $aDefence from parasites and pathogens involves a cost. Thus, it is expected that organisms use this only at high population densities, where the risk of pathogen transmission may be high, as proposed by the "density-dependent prophylaxis" (DDP) hypothesis. These predictions have been tested in a wide range of insects, both in comparative and experimental studies. We think it pertinent to consider a continuum between solitarious and gregarious living insects, wherein: (1) solitarious insects are those that are constitutively solitary and do not express any phenotypic plasticity, (2) the middle of the continuum is represented by insects that are subject to fluctuations in local density and show a range of facultative and plastic changes; and (3) constitutively gregarious forms live gregariously and show the gregarious phenotype even in the absence of crowding stimuli. We aimed to chart some of the intermediary continuum with an insect that presents solitarious aspects, but that is subject to fluctuations in density. Thus, Anticarsia gemmatalis (Lepidoptera: Noctuidae) larvae reared at higher densities showed changes in coloration, a greater degree of encapsulation, had higher hemocyte densities and were more resistant to Baculovirus anticarsia, but not to Bacillus thuringiensis. Meanwhile, with increased rearing density there was reduced capsule melanization. Hemocyte density was the only variable that did not vary according to larval phenotype. The observed responses were not a continuous function of larval density, but an all-or-nothing response to the presence of a conspecific. As A. gemmatalis is not known for gregarious living, yet shows these density-dependent changes, it thus seems that this plastic phenotypic adjustment may be a broader phenomenon than previously thought.
650 $aInseto
650 $aPatógeno
700 1 $aVIOL, D. L.
700 1 $aFARIA, S. V.
700 1 $aLIMA, E.
700 1 $aVALICENTE, F. H.
700 1 $aELLIOT, S. L.
773 $tPlos One, San Francisco$gv. 8, n. 4, p. 1-10, 2013.
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Registro original: |
Embrapa Milho e Sorgo (CNPMS) |
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URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Ocidental. |
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Data corrente: |
23/11/2018 |
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Data da última atualização: |
23/11/2018 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
MORAIS, I. da S. de; REIS, V. R.; ALMEIDA, F. L. |
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Afiliação: |
IRANI DA SILVA DE MORAIS, CPAA; V. R. Reis; FERNANDA LOUREIRO ALMEIDA OSULLIVAN, CPAA. |
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Título: |
The influence of water pH on the sex determination of tambaqui (Colossoma macropomum). |
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Ano de publicação: |
2018 |
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Fonte/Imprenta: |
In: INTERNATIONAL SYMPOSIUM ON REPRODUCTIVE PHYSIOLOGY OF FISH, 11., 2018, Manaus. |
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Páginas: |
p. 100. |
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Idioma: |
Inglês |
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Conteúdo: |
The Amazonian tambaqui (Colossoma macropomum) are the most important native fish in Brazilian aquaculture. The species is responsible for more than 38% of the national production of fish. At harvest, females are almost 20% heavier than males, therefore are the most profitable sex to be cultivated in tambaqui farming. In order to provide knowledge supporting the development of new technologies for the tambaqui industry, we aimed to evaluate the influence of pH on the sex determination of tambaqui. |
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Thesagro: |
Colossoma Macropomum; Tambaqui. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/186957/1/ISRPF-PROGRAM-2018-100.pdf
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Marc: |
LEADER 01052nam a2200169 a 4500
001 2100003
005 2018-11-23
008 2018 bl uuuu u00u1 u #d
100 1 $aMORAIS, I. da S. de
245 $aThe influence of water pH on the sex determination of tambaqui (Colossoma macropomum).$h[electronic resource]
260 $aIn: INTERNATIONAL SYMPOSIUM ON REPRODUCTIVE PHYSIOLOGY OF FISH, 11., 2018, Manaus.$c2018
300 $ap. 100.
520 $aThe Amazonian tambaqui (Colossoma macropomum) are the most important native fish in Brazilian aquaculture. The species is responsible for more than 38% of the national production of fish. At harvest, females are almost 20% heavier than males, therefore are the most profitable sex to be cultivated in tambaqui farming. In order to provide knowledge supporting the development of new technologies for the tambaqui industry, we aimed to evaluate the influence of pH on the sex determination of tambaqui.
650 $aColossoma Macropomum
650 $aTambaqui
700 1 $aREIS, V. R.
700 1 $aALMEIDA, F. L.
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Embrapa Amazônia Ocidental (CPAA) |
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