Kang H.-K.,Korea Ocean Research and Development Institute
Journal of Plankton Research | Year: 2012
The ingestion rate, egg production, egg-hatching success and survival rate of adult female copepods, Paracalanus sp., in relation to a suspended sediment concentration gradient (control: 0 mg L-1, low: 10 mg L-1, middle: 30 mg L-1 and high: 100 mg L-1) were examined in the laboratory under two concentrations (1 × 103 and 1 × 104 cells mL-1) of the dinoflagellate Prorocentrum minimum to understand the impacts of turbidity on the reproductive responses. Ingestion rates under both phytoplankton concentrations were significantly lower at high level of suspended sediments than at the control level. The egg production rate at the low phytoplankton concentration also decreased with increasing suspended sediment concentration, but there was no effect of suspended sediment on egg production at the high phytoplankton concentration. Egg-hatching success was relatively high at >90; thus, there was no deleterious effect of suspended sediments on egg viability. The survival rate of adult females decreased with time in all treatments, indicating no negative effects of suspended sediments on the mortality of female copepods. These results suggest that higher concentrations of suspended sediments might have negative effects on copepod recruitment in the field. Feeding efficiency on phytoplankton decreased in the presence of suspended sediments, thus potentially decreasing the copepod egg production rate. However, the negative effects may be lessened if the copepod ingests more food in terms of both quality and quantity in favorable food environments. © 2012 The Author. Published by Oxford University Press. All rights reserved.
Ham Y.-G.,NASA |
Ham Y.-G.,Universities Space Research Association |
Kug J.-S.,Korea Ocean Research and Development Institute
Climate Dynamics | Year: 2012
In this study, we evaluate the fidelity of current climate models in simulating the two types of El Nino events using the pre-industrial output in CMIP3 archives. It is shown that a few climate models simulate the two types of El Nino events to some extent, while most of the models have serious systematic problems in simulating distinctive patterns of sea-surface temperature (SST) and precipitation anomaly associated with the two types of El Nino; that is, they tend to simulate a single type of El Nino. It is shown that the ability of climate models in simulating the two types of El Nino is related to the sensitivity of the atmospheric responses to the SST anomaly patterns. Models whose convective location is shifted to the east (west) as the SST anomaly center moves to the east (west) tends to simulate the two types of El Nino events successfully. On the other hand, models whose location of convective anomaly is confined over the western or central Pacific tends to simulate only the single type of El Nino event. It is also shown that the confinement of the convective anomaly over the western or central Pacific is closely linked to the dry bias and the associated cold bias over the eastern Pacific. That is, because positive El Nino SST anomalies over the eastern Pacific cannot increase local convection effectively when the total SSTs are still too cold due to a cold bias. This implies that the realistic simulation of climatology, especially over the equatorial eastern Pacific, is essential to the successful simulation of the two types of El Nino. © 2011 Springer-Verlag.
Korea Ocean Research and Development Institute | Date: 2013-11-29
The present invention relates to novel hydrogenases isolated from novel hyperthermophilic strains belonging to
Korea Ocean Research and Development Institute | Date: 2014-04-25
The present invention relates to the novel use (anti-inflammatory activity) of Ramalin isolated from the Antarctic lichen
Korea Ocean Research and Development Institute | Date: 2013-05-22
The present invention relates to pharmaceutical and food compositions for preventing or treating diabetes or obesity, and more particularly to pharmaceutical compositions and functional foods for preventing or treating diabetes or obesity, which contain, as an active ingredient, a novel compound synthesized from a compound separated from an extract of the