| multi-level assessment of chronic toxicity of estuarine sediments with the amphipod gammarus locusta: i. biochemical endpoints. | we report on biomarker responses conducted as part of a multi-level assessment of the chronic toxicity of estuarine sediments to the amphipod gammarus locusta. a companion article accounts for organism and population-level effects. five moderately contaminated sediments from two portuguese estuaries, sado and tagus, were assessed. three of them were muddy and two were sandy sediments. the objective was to assess sediments that were not acutely toxic. three of the sediments met this criterion, th ... | 2005 | 15649528 |
| multi-level assessment of chronic toxicity of estuarine sediments with the amphipod gammarus locusta: ii. organism and population-level endpoints. | this study aimed to test the performance of the amphipod gammarus locusta (l.) in chronic sediment toxicity tests. it constitutes part of a multi-level assessment of chronic toxicity of estuarine sediments, integrating organism and population-level endpoints with biochemical markers responses. here we account for organism and population-level effects, while biomarker responses were reported in a companion article. five moderately contaminated sediments from sado and tagus estuaries were tested, ... | 2005 | 15649529 |
| redescription of lagenophrys maxillaris (jankowski, 1993) (ciliophora, peritrichia, lagenophryidae), an ectosymbiont of marine amphipods. | the loricate peritrich ciliate lagenophrys maxillaris, a highly specialized ectosymbiont of marine gammarid amphipods, was examined and redescribed by using material from museum collections to make hematoxylin and protargol preparations. the infraciliature is described for the first time, and the shape of the macronucleus was found to differ significantly from the shape given in the original description. lagenophrys maxillaris is one of only four species of lagenophrys known to occur on the maxi ... | 2005 | 15702978 |
| congeneric amphipods show differing abilities to maintain metabolic rates with latitude. | metabolic variability across latitudinal populations of gammarid amphipods was examined in the summer by determining whole-animal rates of oxygen uptake (m(o)₂) in four species with overlapping distribution patterns in the northeast atlantic and arctic oceans. comparisons were made between an arctic/boreal species, gammarus setosus, a subarctic/boreal species, gammarus oceanicus, a boreal/temperate species, gammarus duebeni duebeni, and a temperate species, gammarus locusta. measurements include ... | 2013 | 21460526 |
| microtubule systems associated with the septate junctions of the gill cells of four gammarid amphipods. | the microtubular systems associated with the septate junctions of the gill epithelial cells of four species of gammarid amphipod are described. the four species examined included two relatively stenohaline marine forms, chaetogammarus marinus and gammarus locusta; a highly euryhaline species, gammarus duebeni, and a stenohaline freshwater species, gammarus pulex. of these amphipods, g. locusta and c. marinus maintain only a limited osmotic gradient between their haemolymph and the medium and hav ... | 1995 | 18621295 |