1,721,089 research outputs found
Pelagic biomass and production in the Adriatic Sea. In: The European Anchovy and its Environment
No full textSeasonal variations in carbon and nitrogen content of Acartia clausi (Copepoda, Calanoida) in the Gulf of Trieste (Northern Adriatic Sea).
No full textSEASONAL AND INTER-ANNUAL VARIABILITY OF MESOZOOPLANKTON BIOMASS IN THE NORTHERN ADRIATIC SEA (GULF OF TRIESTE).
No full textThis paper reports the rate of change of mesozooplankton biomass on seasonal, inter-annual and decadal
time scale in the Gulf of Trieste (NE Mediterranean, Northern Adriatic). We measured variability in
mesozooplankton dry weight (mg DW m−3), organic carbon and nitrogen contents of the DW in relation to
mesozooplankton taxonomic structure and some environmental parameters. The study is based on data
obtained from mesozooplankton samples collected monthly by a vertical WP2 net (200 μm) from January
1986 to September 2005 at one monitoring station, a coastal site in the Gulf of Trieste. We considered
mesozooplankton DW in relation to copepods, phytoplankton taxonomic structure, water temperature and
North Atlantic Oscillation. For further analyses we counted also on data for DW for the period 1972–1980,
monthly data for organic carbon (mg C m−3) and nitrogen contents (mg N m−3) of the DW for the period
1991–2005, determined by a CHN Elemental Analyzer.We explored statistically our high temporal resolution
time series data picking out the main features: seasonal components and trends. Mesozooplankton DW
ranged from only 1 mg m−3 (January 1977) to 95 mg m−3 (March 1990) in the coastal ecosystem of the
Northern Adriatic during the period 1972–2005. The annual cycle of the DW was found to be bimodal with
maximum in late winter–spring and a weaker one in late summer. Maximum DW were regularly recorded
when Copepods prevailed the mesozooplankton community structure. Similarly, high organic carbon and
nitrogen contents were detected when copepods dominated, although wide-ranging on a seasonal scale.
Irregular intra- and inter-annual fluctuations were typical mostly during the 1990s. Mesozooplankton DW
sharply shifted since 2001–2002 to the level exceeding the observed one during the regime of the 1980s. Our
results indicate substantial changes in the seasonal timing of mesozooplankton DW, which together with
decadal inter-annual fluctuations match significantly with shifts in copepods, phytoplankton taxonomic
structure, temperature and NAO index. The discussed zooplankton descriptors (DW, C and N contents and
C:N ratio) being to a certain degree predictive of phyto- and mesozooplankton composition, in essence
might foretell the phenological response of plankton communities to environmental changes in the coastal
ecosystem, including climate change
Tintinnids in Terranova Bay - Ross Sea During Two Austral Summers (1987/88 and 1989/90).
No full text
Long-Term Copepod Dynamic in the Gulf of Trieste (Northern Adriatic Sea). Recent Changes and Trends
No full textCluster and time series analyses were applied to a 1970–1999 data set of zooplankton
collected from the Gulf of Trieste (Northern Adriatic Sea). Two time periods were compared:
1970–1980 and 1986–1999. Associations of copepod species were identified and an attempt was
made to reveal their long-term dynamics and significant patterns over the study period. Two main
groups with 2 and 3 subgroups each were identified. We observed a seasonal alternation of the 2
main groups, albeit with remarkably different patterns during the 2 periods. Time-series analyses
suggested recent changes in the periodicity of the associations. The long-term annual mean copepod
abundance showed an increase in the late 1990s in comparison to the 1970s; however, this increase
was not constant. Small-sized copepods increased in the second period, indicative of changes in the
phytoplankton size spectrum. Shifts in the 1990s appeared to be related to climate change in the
Northern Hemisphere that appeared abruptly after 1987. Climate change is thus recognized as the
most important factor (more so than anthropogenic change) affecting inter-annual and inter-decadal
variability of plankton dynamics. The strong signal recorded in the zooplankton community seems to
reflect this, identifying the Gulf of Trieste as one of the most sensitive areas in the Mediterranean
Seasonal variations in the dynamics of microbial plankton communities: first estimates from experiments in the Gulf of Trieste, Northern Adriatic Sea
No full textMucilaginous agglomerations in the Gulf of Trieste (Northern Adriatic Sea): analysis of the micro-zooplankton populations in the period June-August 1989
No full textDistribution of the main microzooplankton taxa in the Ross Sea (Antarctica): austral summer 1994
No full textThe application of a plug-flow reactor to measure the biodegradable dissolved organic carbon (BDOC) in seawater.
No full text- …
