GENETIC COSTS OF TOLERANCE TO METALS IN DAPHNIA LONGISPINA POPULATIONS HISTORICALLY EXPOSED TO A COPPER MINE DRAINAGE

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Agra, AR (Author) Other; Guilhermino, L. (Author) ICBAS; Soares, AMVM (Author) Other; Barata, C (Author) Other

Journal

Title: Environmental Toxicology and Chemistry

Vol. 29

Pages: 939-946

ISSN: 0730-7268

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 23 Citations

ISI Web of Science

Scopus - 20 Citations

Pubmed / Medline

Scientific classification

FOS: Natural sciences > Biological sciences

Other information

Authenticus ID: P-003-7R6

DOI: 10.1002/etc.97

Abstract (EN): The present study was conducted to assess three microevolutionary aspects of adaptation to pollution in Daphnia longispina populations historically exposed to an acid mine drainage from an abandoned pyrite mine: pollution mediated effects in acute tolerance to copper (Cu) and zinc (Zn); pollution-mediated effects on genetic variability of tolerant and physiological traits related to fitness (feeding rates); and fitness costs of tolerance measured as genetic trade-offs between tolerance and feeding rates under none and low levels of contamination. These objectives were addressed by comparing broad sense heritabilities and genetic correlations using up to 20 distinct clonal lineages randomly obtained from two populations: one located in a water reservoir contaminated by the acid mine drainage, and the other located in a nearby clean water reservoir. Results showed that only sensitive and resistant lineages to Cu were present in the reference and contaminated site, respectively. For Zn, however, both populations had a similar distribution pattern of sensitivities. Heritability values for tolerant and feeding traits across metal exposure levels was similar in both populations being in most cases greater than 50%. Fitness costs of tolerance were illustrated by lower feeding rates of the tolerant population compared to the reference one and negative genetic correlations between mean clonal feeding rates and median clonal survival time in control conditions (no added Cu or Zn). The results obtained thus support the view that tolerance to pollution is ecologically costly. Environ. Toxicol. Chem. 2010;29:939-946. (C) 2009 SETAC

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8