Encontrados 4 documentos, a visualizar página 1 de 1
Structural and functional responses of benthic invertebrates to imidacloprid in...
Pestana, J. L. T.; Alexander, A. C.; Culp, J. M.; Baird, D. J.; Cessna, A. J.; Soares, A. M. V. M.Structural and functional responses of a benthic macroinvertebrate assemblage to pulses of the insecticide imidacloprid were assessed in outdoor stream mesocosms. Imidacloprid pulses reduced invertebrate abundance and community diversity in imidacloprid-dosed streams compared to control streams. These results correlated well with effects of imidacloprid on leaf litter decomposition and feeding rates of Pteronar...
Genetic Determination of Tolerance to Lethal and Sublethal Copper Concentration...
Lopes, I.; Baird, D. J.; Ribeiro, R.In order to study the effects of environmental pollution on the genetic diversity of natural populations, two field populations of the cladoceran Daphnia longispina were sampled: one in a reference site (uncontaminated) and the other in a site historically stressed with acid mine drainage (AMD). Five hypotheses were formulated: (1) the stressed population presents a higher tolerance to lethal levels of copper t...
Testing physiologically-based resource allocation rules in laboratory experimen...
Nogueira, António; Baird, D. J.; Soares, AmadeuThe rules governing the allocation of available resources to varying physiological processes are evaluated in three physiologically-based models of individual Daphnia. In laboratory experiments using a single clone, subjected to varying regimes of food deprivation, growth was found to vary inversely with food level, ceasing in the absence of food, implying that growth allocation is derived directly from food. R...
Determining the ecotoxicological mode of action of toxic chemicals in meiobenth...
Barata, C.; Baird, D. J.; Medina, M.; Albalat, A.; Soares, A.A short-term Tisbe battagliai toxicity test design was used to assess the potential ecological effects of pollutants in coastal marine communities. By exposing nauplii and reproductive females over 4 and 6 d, respectively, to 3 toxic substances (fluoranthene, cypermethin and deltamethrin), the bioassay was seen to successfully measure survival effects on egg, nauplii and adults and sublethal effects on food acq...
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