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Registro Completo |
Biblioteca(s): |
Embrapa Gado de Leite. |
Data corrente: |
23/01/2016 |
Data da última atualização: |
03/02/2024 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
AUAD, A. M.; SILVA, S. E. B.; SANTOS, J. C.; VIEIRA, T. M. |
Afiliação: |
ALEXANDER MACHADO AUAD, CNPGL; Sandra E. B. Silva; Juliana C. Santos; Tamiris M. Vieira. |
Título: |
Impact of fluctuating and constant temperatures on key life history parameters of Sipha flava (Hemiptera: Aphididae). |
Ano de publicação: |
2015 |
Fonte/Imprenta: |
Florida Entomologist, v. 98, n. 2, p. 424-429, 2015. |
Idioma: |
Inglês |
Conteúdo: |
This study aimed to evaluate the impact of constant and fluctuating temperatures on the biology of Sipha flava (Forbes) (Hemiptera: Aphididae) in order to determine whether the results of laboratory studies can be extrapolated to those performed in natural conditions. We compared the biological parameters of S. flava kept in an uncontrolled greenhouse in which temperatures fluctuated (treatment 1) with those kept in a phytotron-type climate chamber that simulated the mean hourly average temperatures of the greenhouse (treatment 2). In addition, we compared the effects of treatment 2 versus the effects of having a set temperature during photophase and another set temperature during scotophase versus a constant daily average temperature. The experimental design was completely random, and 150 nymphs were used per treatment at the outset of the biossays. However, the number of repetitions was altered in relation to survival of the aphids in the different instars and treatments. By daily use of a stereoscopic microscope, we evaluated the following parameters: the duration (days) and survival (%) of each instar and stage as well as the reproductive capacity (offspring per female per day) and the longevity (days) of adults. The simulation of mean hourly temperatures of an uncontrolled greenhouse favored the survival, reproductive capacity, and longevity of adults ? which are factors of great importance in the insect population growth ? compared with those insects kept at 27 °C (photophase) and 18 °C (scotophase) or kept at the constant daily average temperature. The results showed that much caution must be exercised in extrapolating results obtained in the laboratory under constant temperatures to predict the population dynamics of field populations of S. flava. MenosThis study aimed to evaluate the impact of constant and fluctuating temperatures on the biology of Sipha flava (Forbes) (Hemiptera: Aphididae) in order to determine whether the results of laboratory studies can be extrapolated to those performed in natural conditions. We compared the biological parameters of S. flava kept in an uncontrolled greenhouse in which temperatures fluctuated (treatment 1) with those kept in a phytotron-type climate chamber that simulated the mean hourly average temperatures of the greenhouse (treatment 2). In addition, we compared the effects of treatment 2 versus the effects of having a set temperature during photophase and another set temperature during scotophase versus a constant daily average temperature. The experimental design was completely random, and 150 nymphs were used per treatment at the outset of the biossays. However, the number of repetitions was altered in relation to survival of the aphids in the different instars and treatments. By daily use of a stereoscopic microscope, we evaluated the following parameters: the duration (days) and survival (%) of each instar and stage as well as the reproductive capacity (offspring per female per day) and the longevity (days) of adults. The simulation of mean hourly temperatures of an uncontrolled greenhouse favored the survival, reproductive capacity, and longevity of adults ? which are factors of great importance in the insect population growth ? compared with those insects kept at 27 °C (pho... Mostrar Tudo |
Palavras-Chave: |
Aphid; Insect. |
Thesaurus Nal: |
forage. |
Categoria do assunto: |
O Insetos e Entomologia |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/137565/1/Cnpgl-2015-FloridaEnt-Impact.pdf
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Marc: |
LEADER 02361naa a2200193 a 4500 001 2034881 005 2024-02-03 008 2015 bl uuuu u00u1 u #d 100 1 $aAUAD, A. M. 245 $aImpact of fluctuating and constant temperatures on key life history parameters of Sipha flava (Hemiptera$bAphididae).$h[electronic resource] 260 $c2015 520 $aThis study aimed to evaluate the impact of constant and fluctuating temperatures on the biology of Sipha flava (Forbes) (Hemiptera: Aphididae) in order to determine whether the results of laboratory studies can be extrapolated to those performed in natural conditions. We compared the biological parameters of S. flava kept in an uncontrolled greenhouse in which temperatures fluctuated (treatment 1) with those kept in a phytotron-type climate chamber that simulated the mean hourly average temperatures of the greenhouse (treatment 2). In addition, we compared the effects of treatment 2 versus the effects of having a set temperature during photophase and another set temperature during scotophase versus a constant daily average temperature. The experimental design was completely random, and 150 nymphs were used per treatment at the outset of the biossays. However, the number of repetitions was altered in relation to survival of the aphids in the different instars and treatments. By daily use of a stereoscopic microscope, we evaluated the following parameters: the duration (days) and survival (%) of each instar and stage as well as the reproductive capacity (offspring per female per day) and the longevity (days) of adults. The simulation of mean hourly temperatures of an uncontrolled greenhouse favored the survival, reproductive capacity, and longevity of adults ? which are factors of great importance in the insect population growth ? compared with those insects kept at 27 °C (photophase) and 18 °C (scotophase) or kept at the constant daily average temperature. The results showed that much caution must be exercised in extrapolating results obtained in the laboratory under constant temperatures to predict the population dynamics of field populations of S. flava. 650 $aforage 653 $aAphid 653 $aInsect 700 1 $aSILVA, S. E. B. 700 1 $aSANTOS, J. C. 700 1 $aVIEIRA, T. M. 773 $tFlorida Entomologist$gv. 98, n. 2, p. 424-429, 2015.
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Embrapa Gado de Leite (CNPGL) |
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Biblioteca(s): |
Embrapa Florestas. |
Data corrente: |
19/01/2018 |
Data da última atualização: |
22/01/2018 |
Autoria: |
BRAGA, E. O.; ROCHA, A. E. S.; COSTA NETO, S. V.; LIMA, T. T. S.; COSTA, L. G. S.; MIRANDA, I. S. |
Título: |
Biomassa e sazonalidade das raízes finas em savanas da Amazônia Oriental. |
Ano de publicação: |
2017 |
Fonte/Imprenta: |
Pesquisa Florestal Brasileira, Colombo, v. 37, n. 92, p. 475-483 out./dez. 2017. |
DOI: |
10.4336/2017.pfb.37.92.1382 |
Idioma: |
Português |
Conteúdo: |
Este trabalho objetivou comparar a biomassa de raízes finas em diferentes fisionomias e avaliar a influência da sazonalidade sobre a massa de raízes finas em savanas amazônicas localizadas no Amapá e Pará. Amostras de solos foram coletadas em cinco profundidades, de 10 em 10 cm, em três pontos no Cerrado sensu stricto, quatro no Campo Cerrado e dois no Campo Limpo, com 4 repetições em cada posição. A influência da sazonalidade foi verificada apenas no Campo Cerrado, em abril (pico das chuvas), julho (final das chuvas) e outubro (pico da seca) de 2010 e em janeiro de 2011 (inicio das chuvas). As fisionomias foram diferenciadas pela massa de raízes, quando analisadas nas diferentes classes diamétricas de raízes e nas diferentes profundidades. A maior massa de raízes finas ocorreu no pico da estação seca. Esses resultados sugerem estratégias diferentes das fisionomias na alocação das raízes mais finas em diferentes profundidas do solo e na dinâmica das raízes para aumentar o potencial de absorção durante a seca. |
Palavras-Chave: |
Estação seca. |
Thesagro: |
Rizosfera; Sistema radicular. |
Thesaurus NAL: |
Rhizosphere; Root systems. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/171395/1/1382-16849-1-PB.pdf
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Marc: |
LEADER 01808naa a2200253 a 4500 001 2085868 005 2018-01-22 008 2017 bl uuuu u00u1 u #d 024 7 $a10.4336/2017.pfb.37.92.1382$2DOI 100 1 $aBRAGA, E. O. 245 $aBiomassa e sazonalidade das raízes finas em savanas da Amazônia Oriental.$h[electronic resource] 260 $c2017 520 $aEste trabalho objetivou comparar a biomassa de raízes finas em diferentes fisionomias e avaliar a influência da sazonalidade sobre a massa de raízes finas em savanas amazônicas localizadas no Amapá e Pará. Amostras de solos foram coletadas em cinco profundidades, de 10 em 10 cm, em três pontos no Cerrado sensu stricto, quatro no Campo Cerrado e dois no Campo Limpo, com 4 repetições em cada posição. A influência da sazonalidade foi verificada apenas no Campo Cerrado, em abril (pico das chuvas), julho (final das chuvas) e outubro (pico da seca) de 2010 e em janeiro de 2011 (inicio das chuvas). As fisionomias foram diferenciadas pela massa de raízes, quando analisadas nas diferentes classes diamétricas de raízes e nas diferentes profundidades. A maior massa de raízes finas ocorreu no pico da estação seca. Esses resultados sugerem estratégias diferentes das fisionomias na alocação das raízes mais finas em diferentes profundidas do solo e na dinâmica das raízes para aumentar o potencial de absorção durante a seca. 650 $aRhizosphere 650 $aRoot systems 650 $aRizosfera 650 $aSistema radicular 653 $aEstação seca 700 1 $aROCHA, A. E. S. 700 1 $aCOSTA NETO, S. V. 700 1 $aLIMA, T. T. S. 700 1 $aCOSTA, L. G. S. 700 1 $aMIRANDA, I. S. 773 $tPesquisa Florestal Brasileira, Colombo$gv. 37, n. 92, p. 475-483 out./dez. 2017.
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