Two decades of colonization of the urban environment of Porto Alegre, southern Brazil, by Drosophila paulistorum (Diptera, Drosophilidae)

Iheringia. Série Zoologia

Ana Cristina L. Garcia²  Victor Hugo Valiati¹  Marco S. Gottschalk²  Cláudia Rohde²  Vera Lúcia Da S. Valente² 

[1] ,Universidade Federal do Rio Grande do Sul Instituto de Biociências Departamento de GenéticaPorto Alegre RS ,Brazil

关键词: Biological invasion;    colonization;    Drosophila paulistorum;    urban ecology;    Zaprionus indianus;    Invasão biológica;    colonização;    Drosophila paulistorum;    ecologia de ambientes urbanos;    Zaprionus indianus;   

DOI  :  10.1590/S0073-47212008000300007

来源: SciELO

【 摘 要 】

Drosophila paulistorum Dobzhansky & Pavan, 1949 had initially been considered absent in anthropogenically disturbed environments, but in 1985 the detection of the species in Porto Alegre city, southern Brazil, suggested its potential to colonize new habitats and laid the foundations for ecologic studies on this species' populations. This study followed the variations in D. paulistorum populations in this town almost 20 years after its first local record. Drosophilid specimens were collected in sites with different urbanization grades and the results point to the expressive decline in D. paulistorum populations in Porto Alegre. This decline may be linked to urban growth and to naturally driven population decline, as imputed to climatic changes like variations in maximum and minimum temperatures as a consequence of a global climate warming. Also, the recent introduction of exotic species Zaprionus indianus Gupta, 1970 seems to play a role in this scenario, changing the interactions between native species.

【 授权许可】

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