English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Phytoplankton and bacteria are sensitive indicators of environmental  change. The temporal development of these key organisms was  monitored from 1988 to the end of 2007 at the time series station  Boknis Eck in the western Baltic Sea. This period was characterized  by the adaption of the Baltic Sea ecosystem to changes in the  environmental conditions caused by the conversion of  the political system in the southern and eastern border states,  accompanied by the general effects of global climate  change. Measured variables were chlorophyll, primary production,  bacteria number, -biomass and -production, glucose turnover rate,  macro-nutrients, pH, temperature and salinity. Negative trends with  time were recorded for chlorophyll, bacteria number, bacterial  biomass and bacterial production, nitrate, ammonia, phosphate, silicate, oxygen and  salinity while temperature, pH, and the ratio between bacteria  numbers and chlorophyll increased. Strongest reductions with  time occurred for the annual maximum values, e.g. for chlorophyll  during the spring bloom or for nitrate during winter, while the  annual minimum values remained more stable. In deep water above sediment  the negative trends of oxygen, nitrate, phosphate and bacterial  variables as well as the positive trend of temperature were similar  to those in the surface while the trends of salinity, ammonia and  silicate were opposite to those in the surface. Decreasing oxygen,  even in the surface layer, was of particular interest because it  suggested enhanced recycling of nutrients from the deep hypoxic  zones to the surface by vertical mixing. The long-term seasonal  patterns of all variables correlated positively with temperature, except chlorophyll  and salinity. Salinity correlated negatively with all bacterial  variables (as well as precipitation) and positively with  chlorophyll. Surprisingly, bacterial variables did not correlate  with chlorophyll, which may be inherent with the time lag between the  peaks of phytoplankton and bacteria during spring. Compared to the  20-yr averages of the environmental and microbial variables, the  strongest negative deviations of corresponding annual averages were  measured about ten years after political change for nitrate and bacterial  secondary production (~ −60%),  followed by chlorophyll (−50%) and bacterial  biomass (−40%). Considering the circulation of surface  currents in the Baltic Sea we interpret the observed patterns of the microbial variables at  the Boknis Eck time series station as a consequence of the improved management  of water resources after 1989 and – to a minor extent – the  trends of the climate variables salinity and temperature

Impact of change in climate and policy from 1988 to 2007 on environmental and microbial variables at the time series station Boknis Eck, Baltic Sea