Interannual variability in phytoplankton biomass and species composition in northern Marguerite Bay (West Antarctic Peninsula) is governed by both winter sea ice cover and summer stratification

first_imgThe rapid warming of the West Antarctic Peninsula region has led to reduced sea ice cover and enhanced glacial melt water input. This has potential implications for marine ecosystems, notably phytoplankton growth, biomass, and composition. Fifteen years (1997–2012) of year-round size fractionated chlorophyll a (Chl a), phytoplankton pigment fingerprinting and environmental data were analyzed to identify the relationship between sea ice cover, water column stability and phytoplankton dynamics in northern Marguerite Bay, Antarctica. Over the investigated period, both summer (December–February) and winter biomass declined significantly, 38.5% and 33.3% respectively. Winter phytoplankton biomass was low (< 0.25 μg Chl a L−1) and consisted on average of 69% diatoms, 5% cryptophytes, and 20% haptophytes. Summers following winters with low (< 65 days) sea ice cover were characterized by decreased stratification strength and relatively low (median  20 μm) fraction was strongly decreased in the low biomass years, from 92% to 39%, coinciding with a smaller diatom fraction in favor of nanophytoplankton ( 95%) during summers with average-to-high biomass. We advance a conceptual model whereby low winter sea ice cover leads to low phytoplankton biomass and enhanced proportions of nanophytoplankton, when this coincides with reduced stratification during summer. These changes are likely to have a strong effect on the entire Antarctic marine food web, including krill biomass, and distribution.last_img read more

PRICE, MARY F. (Clemente)

first_img94, of Union Beach, passed away January 20, 2018, at Madison Center, Old Bridge. She was born in Kitzmiller, MD; and resided in Bayonne prior to settling in Union Beach. She was a homemaker and a Eucharistic Minister at St. Andrew’s Church, Bayonne. Mary was predeceased by her husband, William F. Price; her parents, Danado and Rosa (Colurso) Clemente; and eight brothers and sisters. She is survived by her children, Francis Price, Mary Rose Gouker and her husband George, and Joseph Price; nine cherished grandchildren and five precious great grandchildren. In lieu of flowers, donations may be made to the family. Funeral arrangements by DAY Funeral Home, 361 Maple Place, Keyport, NJ.last_img read more