Ficha de avaliação EICAT
Bromus tectorum
MO · Moderado
Avaliação histórica recuperada de registros do SIGEEI. A estrutura e os campos foram preservados; a confirmação permanece pendente.
Identificação e síntese
Nomenclature and linkage
The original assessment name is preserved. The accepted name and synonyms support discovery and reconciliation without overwriting the historical EICAT record.
Taxonomia registrada
Classificação canônica recuperada da integração com o GBIF. O sistema explicita os níveis que a própria resposta do GBIF não informa.
Avaliação de impactos
1. Redução no desempenho de indivíduos da biota nativa
Resposta: Sim
Mecanismos selecionados: (1) Competição,(9) Impacto químico no ecossistema
Evidências por mecanismo
\"The uninvaded site was dominated by Stipa comata (36.6 +-7.8), followed by other species (14.2 +- 4.4) and Hilaria jamesii (4.5 6 2.6). The invaded site was dominated by Bromus tectorum (23.0 +- 6.6), followed by other species (24.5 +- 5.0) and H. jamesii (8.5 +- 2.6). Bare ground was similar for both types of sites (43.6 +- 5.1).\" (Rimer and Evans 2006)
\"Two years post invasion, the labile pool of soil nitrogen, in situ inorganic nitrogen and in situ net mineralization were significantly different between the invaded and uninvaded areas. The labile pool of soil nitrogen was over 50% smaller for invaded sites than uninvaded sites as calculated using data from long-term soil incubations (Fig. 1).\" (Rimer and Evans 2006)
Referências: Rimer RL, Evans RD (2006) Invasion of Downy Brome (Bromus tectorum L.) Causes Rapid Changes in the Nitrogen Cycle. Am. Midl. Nat. 156:252–258. http://dx.doi.org/10.1674/0003-0031(2006)156[252:IODBBT]2.0.CO;2
2. Declínio no tamanho populacional de espécie nativa
Resposta: Sim
Mecanismos selecionados: (1) Competição,(9) Impacto químico no ecossistema
Evidências por mecanismo
\"At Dugway, B. tectorum neighbors significantly reduced biomass of E. elymoides target plants at the end of the first spring growing season (F = 15:08; p< 0:001), but E. elymoides neighbors did not (throughout, we refer to effects as not significant when p>0,10).\" (Humphrey and Schupp 2004) \"The uninvaded site was dominated by Stipa comata (36.6 +-7.8), followed by other species (14.2 +- 4.4) and Hilaria jamesii (4.5 6 2.6). The invaded site was dominated by Bromus tectorum (23.0 +- 6.6), followed by other species (24.5 +- 5.0) and H. jamesii (8.5 +- 2.6). Bare ground was similar for both types of sites (43.6 +- 5.1).\" (Rimer and Evans 2006)
\"Two years post invasion, the labile pool of soil nitrogen, in situ inorganic nitrogen and in situ net mineralization were significantly different between the invaded and uninvaded areas. The labile pool of soil nitrogen was over 50% smaller for invaded sites than uninvaded sites as calculated using data from long-term soil incubations (Fig. 1).\" (Rimer and Evans 2006) 'Fine fuel biomass was 3- and 2-fold greater in the annual grass-invaded compared with the non-invaded plant community in 2010 and 2011. Fine fuel biomass was 1109 30 and 349 24 kg ha1 in the annual grass-invaded and non-invaded plant communities in 2010\" (Davies and Nafus 2013)
Referências: Davies KW, Nafus AM (2013) Exotic annual grass invasion alters fuel amounts, continuity and moisture content. International Journal of Wildland Fire. 22, 353–358. http://dx.doi.org/10.1071/WF11161 Humphrey LD, Schupp EW (2003) Competition as a barrier to establishment of a native perennial grass (Elymus elymoides) in alien annual grass (Bromus tectorum) communities. Journal of Arid Environments 58 405–422 Rimer RL, Evans RD (2006) Invasion of Downy Brome (Bromus tectorum L.) Causes Rapid Changes in the Nitrogen Cycle. Am. Midl. Nat. 156:252–258. http://dx.doi.org/10.1674/0003-0031(2006)156[252:IODBBT]2.0.CO;2
3. Extinção local de população nativa
Resposta: Não
4. Reversibilidade da extinção local após remoção do táxon
Resposta: Nenhuma extinção registrada