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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sul. |
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Data corrente: |
25/11/2011 |
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Data da última atualização: |
15/02/2012 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
LACA, E.; GENRO, T. C. M.; BREMM, C.; GENRO, J.; SCHRIEFER, C. |
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Afiliação: |
EMILIO LACA, University of California, Davis, California, United States; TERESA CRISTINA MORAES GENRO, CPPSUL; Carolina Bremm, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil; JAIRO GENRO, Universidade Federal de Santa Maria, Santa Maria, Brazil; Craig Schriefer, University of California, Davis, California, United States. |
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Título: |
Patch size controls selectivity of sheep grazing grass-clover grasslands. |
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Ano de publicação: |
2011 |
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Fonte/Imprenta: |
In: ANNUAL MEETING OF THE SOCIETY FOR RANGE MANAGEMENT, 64., 2011, Billings, MT. Abstracts... [Wheat Ridge: Society for Range Management], 2011. p. 392. |
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Idioma: |
Inglês |
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Conteúdo: |
The trophic interaction between ruminants and grasslands is a fundamental process that shapes landscapes and modulates ecosystem function and productivity. Selective grazing can structure plant communities and thus, the control of selectivity can be used for ecosystems management. We hypothesized that selectivity for clover by sheep can be modulated by changing the degree of interspersion between grass and clover patches. We built 34 x 17 m pastures and modified their vegetation by seeding subclover and using selective broadleaf and grass herbicides to create either four 8.5 x 17 m rectangles or seventeen 2 x 17 m bands dominated by grass or clover. Pastures were grazed in the spring with either four sheep for 12 days or 12 sheep during four days. We measured herbage mass before and after grazing, and observed activity (grazing or other) and location (grass or clover) from 6 AM to 8 PM and determined selectivity as the ratio of total sheep-hours grazing clover divided by sheep-hours grazing grass. Sheep grazed more time in clover than in grass, particularly in the large patches than in the bands (P=0.025, 2.9 vs. 1.4). We did not detect a significant difference due to number of sheep or interaction, but the test had low power due to small sample size. Herbage mass changes also reflected a strong preference for clover, particularly in large patches. These results provide further evidence to the literature that indicates that vegetation pattern can be used as a management factor to modulate plant-animal interactions. MenosThe trophic interaction between ruminants and grasslands is a fundamental process that shapes landscapes and modulates ecosystem function and productivity. Selective grazing can structure plant communities and thus, the control of selectivity can be used for ecosystems management. We hypothesized that selectivity for clover by sheep can be modulated by changing the degree of interspersion between grass and clover patches. We built 34 x 17 m pastures and modified their vegetation by seeding subclover and using selective broadleaf and grass herbicides to create either four 8.5 x 17 m rectangles or seventeen 2 x 17 m bands dominated by grass or clover. Pastures were grazed in the spring with either four sheep for 12 days or 12 sheep during four days. We measured herbage mass before and after grazing, and observed activity (grazing or other) and location (grass or clover) from 6 AM to 8 PM and determined selectivity as the ratio of total sheep-hours grazing clover divided by sheep-hours grazing grass. Sheep grazed more time in clover than in grass, particularly in the large patches than in the bands (P=0.025, 2.9 vs. 1.4). We did not detect a significant difference due to number of sheep or interaction, but the test had low power due to small sample size. Herbage mass changes also reflected a strong preference for clover, particularly in large patches. These results provide further evidence to the literature that indicates that vegetation pattern can be used as a management fact... Mostrar Tudo |
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Thesagro: |
Ovelha; Pastagem; Trevo. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/48052/1/SRM-2011-abstracts-title-index.pdf
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Marc: |
LEADER 02176nam a2200193 a 4500
001 1907385
005 2012-02-15
008 2011 bl uuuu u00u1 u #d
100 1 $aLACA, E.
245 $aPatch size controls selectivity of sheep grazing grass-clover grasslands.$h[electronic resource]
260 $aIn: ANNUAL MEETING OF THE SOCIETY FOR RANGE MANAGEMENT, 64., 2011, Billings, MT. Abstracts... [Wheat Ridge: Society for Range Management], 2011. p. 392.$c2011
520 $aThe trophic interaction between ruminants and grasslands is a fundamental process that shapes landscapes and modulates ecosystem function and productivity. Selective grazing can structure plant communities and thus, the control of selectivity can be used for ecosystems management. We hypothesized that selectivity for clover by sheep can be modulated by changing the degree of interspersion between grass and clover patches. We built 34 x 17 m pastures and modified their vegetation by seeding subclover and using selective broadleaf and grass herbicides to create either four 8.5 x 17 m rectangles or seventeen 2 x 17 m bands dominated by grass or clover. Pastures were grazed in the spring with either four sheep for 12 days or 12 sheep during four days. We measured herbage mass before and after grazing, and observed activity (grazing or other) and location (grass or clover) from 6 AM to 8 PM and determined selectivity as the ratio of total sheep-hours grazing clover divided by sheep-hours grazing grass. Sheep grazed more time in clover than in grass, particularly in the large patches than in the bands (P=0.025, 2.9 vs. 1.4). We did not detect a significant difference due to number of sheep or interaction, but the test had low power due to small sample size. Herbage mass changes also reflected a strong preference for clover, particularly in large patches. These results provide further evidence to the literature that indicates that vegetation pattern can be used as a management factor to modulate plant-animal interactions.
650 $aOvelha
650 $aPastagem
650 $aTrevo
700 1 $aGENRO, T. C. M.
700 1 $aBREMM, C.
700 1 $aGENRO, J.
700 1 $aSCHRIEFER, C.
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Registro original: |
Embrapa Pecuária Sul (CPPSUL) |
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| 4. |  | FONSECA JUNIOR, W. C. da. Análise de mídia sonora. In: DUARTE, J.; BARROS, A. (Org.). Métodos e técnicas de pesquisa em comunicação. São Paulo: Atlas, 2005. 380 p. Três capítulos do livro foram publicados na internet, no site : . Estes capítulos não se encontram impresso no livro mas estão relacionados no sumário . não paginado Este capítulo foi publicado na internet, no site : . O capítulo não foi impresso no livro mas está relacionado no sumário. Cópia em papel encontra-se no Anexo 1 do registro nº...| Biblioteca(s): Embrapa Unidades Centrais. |
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