Effects of livestock removal and perennial grass recovery on the lizards of a desertified arid grassland

Castellano, Michael J.; Valone, Thomas J.

doi:10.1016/j.jaridenv.2005.10.016

Cited by 57 publications

(46 citation statements)

References 35 publications

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“…Nota-se que com a redução e a alteração do clima local, reduz-se, também, a pecuária em termos de cabeças no ambiente, não só de produção, como também de consumo local (Figura 4B), com o aumento da morte dos caprinos, bovinos e equinos remanescentes (Figura 4) (Castellano & Valone, 2006;Hendricks et al, 2007;Goirán et al, 2012;Kong et al 2014).…”

Section: Resultados Das Variáveis Ambientais E Humanasunclassified

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Santana

2016

Desenvolv. Meio Ambiente

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Artigo recebido em 19 de outubro de 2015, versão final aceita em 23 de maio de 2016. RESUMO:A região analisada é historicamente um espaço de conflitos e de uma "violência fundadora", situada acima do médio São Francisco, entre as cidades de Ibimirim e Cabrobó (Pernambuco/Brasil). A presença desses conflitos, associada ao colapso ambiental causado pelo neoextrativismo local e ao clima árido, são fortes indícios para influenciarem a dinâmica populacional. Porém, o contrário é observado na região. A manutenção da população na região é corroborada pelo baixo valor de emigração e pelas narrativas. Por isso, variáveis ambientais e sociais foram coletadas e analisadas para avaliar se a ausência de uma dinâmica populacional é motivada por uma resistência social. Assim, o objetivo deste trabalho foi analisar o contexto ambiental e a narrativa de quem ficou no colapso da matéria-prima na Caatinga Árida pós-neo-extrativismo, onde se pôde notar que a manutenção da população na região trata-se de uma expressão da resistência social local, na interface entre parâmetros ambientais e sociais analisados. A preservação da herança familiar (patrimonialismo) foi considerada o principal destaque nas narrativas dos sertanejos.Palavras-chave: mobilização social; desertificação; neoextrativismo. ABSTRACT:The analyzed region is historically a place of conflict and a 'founding violence', situated above São Francisco River, between the cities of Ibimirim and Cabrobó (Pernambuco/Brazil). The presence of those conflicts, associated with the environmental collapse, caused by the new local extractiv and arid climate, are strong evidence to act on population dynamics. However, the opposite is observed in the region. The maintenance of population there is supported by the low value of emigration and by narratives. Therefore, environmental and social variables were collected and analyzed to assess whether a social resistance motivates the lack of population dynamics. The objective of this study was to analyze the environmental context and the narratives of who remained in collapse of raw material in Arid Caatinga post the new extractivism. Where one might note that the maintenance of the population in the region is an expression of local social resistance, on the

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Section: Resultados Das Variáveis Ambientais E Humanasunclassified

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Santana

2016

Desenvolv. Meio Ambiente

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“…Vegetation change leading to desertification has been attributed to many factors, but is frequently coincident with overgrazing by livestock (Fleischner, 1994;Castellano and Valone, 2006). Although most researchers agree that overgrazing is a major cause of desertification (Van Auken, 2000), livestock removal does not result in the rapid restoration of perennial grassland (Fuhlendorf et al, 2001;Valone et al, 2002).…”

Section: Article In Pressmentioning

confidence: 99%

Effects of Salsola passerina shrub patches on the microscale heterogeneity of soil in a montane grassland, China

Zheng

et al. 2008

Journal of Arid Environments

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“…While plant species identity is certainly critical to highly specialized animals, animals in temperate regions often respond more strongly to changes in the physical attributes of vegetation rather than changes in plant species composition [MacMahon 1981;e.g., ants (Crist and Wiens 1994), birds (Brownsmith 1977;McAdoo et al 1989), lizards (Castellano and Valone 2006;Pianka 1966), rodents (Schooley et al 1996;Waser and Ayers 2003)]. Of specific concern to conservationists, simplification of vegetation structure is often linked to loss of animal abundance and biodiversity (e.g., Ballinger and Watts 1995;Hadden and Westbrooke 1996;McAdoo et al 1989).…”

Section: Introductionmentioning

confidence: 99%

Structural changes in vegetation coincident with annual grass invasion negatively impacts sprint velocity of small vertebrates

2009

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Sagebrush ecosystems in the intermountain west of the United States are being threatened by conversion to the non-native grass, cheatgrass (Bromus tectorum). The dramatic shift in the physical structure of vegetation coincident with cheatgrass invasion likely has negative impacts on animal communities, yet these structural impacts have not been well-studied. In a previous study, dense cheatgrass stems reduced sprint velocity for the flattened, wide-bodied desert horned lizard (Phrynosoma platyrhinos). Here, we asked if a decrease in sprint velocity due to cheatgrass impediment can be generalized to the suite of small vertebrates inhabiting the sagebrush ecosystems of western Utah. We evaluated sprint performance of the common rodent (n = 3) and lizard (n = 4) species on two raceway types, cheatgrass and no-cheatgrass, and hypothesized that body size, body shape, and form of movement are important factors influencing sprint velocity through dense cheatgrass stems. All species showed significant reductions in speed on cheatgrass versus no-cheatgrass raceways, with percent reduction greatest for larger, wider, or hopping organisms compared to smaller, more slender, or running organisms. Of concern, surveys for rodents and lizards at our study areas support a common pattern: lower abundances of small vertebrates, as well as a loss of rodent species richness, in areas infested with cheatgrass compared to intact, native sagebrush communities. By extension, we expect a negative impact on animal communities in other semi-arid regions experiencing dramatic shifts in vegetation structure upon invasion by non-native grasses that are capable of forming dense stands in the interspaces of native desert plants [e.g., Sonoran desert invaded by buffelgrass (Pennisetum ciliare)].

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Effects of livestock removal and perennial grass recovery on the lizards of a desertified arid grassland

Cited by 57 publications

References 35 publications

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Resistência social na Caatinga árida: a narrativa de quem ficou no colapso ambiental

Effects of Salsola passerina shrub patches on the microscale heterogeneity of soil in a montane grassland, China

Structural changes in vegetation coincident with annual grass invasion negatively impacts sprint velocity of small vertebrates

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