The vertical distribution of copepod (>64 pm) grazing was mcasurcd on the equator at 14O”W during March/ April (19 d) and October 1992 (21 d). El NiAo conditions prevailed during the March/April time series. Hydrographic variables were similar to the climatological mean during the October time series.,We found higher weight-specific copepod filtration rates in October when mixed-layer temperatu...

Accelerated anthropogenic changes in the Eastern Mediterranean Sea (EMS) have facilitated introduction, spread and establishment of invasive copepod species this region. Here, we report introduction two non-native cyclopoid copepods Dioithona oculata Oithona davisae for first time Israeli coastal waters describe their temporal variability. The were identified by morphological characteristics, D...

The hypothesis was tested that zooplankton community size structure shifts toward an increased relative biomass of microzooplankton with increased lake trophy at 12 sites in Quebec, The seasonal mean abundance and biomass of ciliates, rotifers, nauplii, cladocerans, and cyclopoid copepods were significantly (P < 0.1) related to lake trophy, but Calanoid copepod abundance and biomass varied inde...

The estuarine copepod Acartia tonsa naturally carried diverse strains of bacteria on its body. The bacterial community composition (BCC) remained very conservative even when the copepod was fed different axenic algal species, indicating that the food per se did not much affect BCC associated with the copepod. In xenic algal treatments, however, copepod-associated BCC differed with each alga fed...

Large copepod species (Calanus spp.) overwinter in the North Water Polynya (NOW; ~75 to 79° N, ~68 to 78° W) and, via upward migration, can potentially exert a rapid and important grazing impact on the spring phytoplankton bloom. This study investigated the pattern and factors controlling copepod herbivory in the NOW from April through July 1998. Typically, there was a chlorophyll maximum betwe...

Predation on rotifers by the small suspension-feeding Calanoid copepod Diaptomus pallidus was examined in order to quantify the effects of prey density, prey type, and the presence of algal food resources on ingestion rates, and to determine whether ingested rotifer biomass could be utilized to enhance the survival and reproduction of the copepods. Clearance and ingestion rates of D. pallidus o...

DMSP-consuming bacteria (DCB) were recovered from the body and fecal pellets of the copepod Acartia tonsa (Dana). The most probable number of DCB associated with starved A. tonsa was 9.2x10(2) cells copepod(-1). The abundance of DCB recovered from the copepod body increased to 1.6-2.8x10(4) after the copepod fed on DMSP-containing alga. DCB abundance associated with fecal pellets averaged 1.2x1...

Following a 120-h exposure period to 3 concentrations of oil dispersions (0.022 mg L(-1) , 1.8 mg L(-1) , and 16.5 mg L(-1) , plus controls) generated from a North Sea crude oil and a subsequent 21-d recovery, mortality, and several reproduction endpoints (egg production rates, egg hatching success, and fraction of females participating in reproduction) in Calanus finmarchicus were studied. Con...