Interannual variability of shellfish toxicity in the Gulf of Maine: Time and space patterns and links to environmental variability

Harmful Algae ◽  
2010 ◽  
Vol 9 (5) ◽  
pp. 458-480 ◽  
Author(s):  
Andrew C. Thomas ◽  
Ryan Weatherbee ◽  
Huijie Xue ◽  
Guimei Liu
Keyword(s):  
Interannual Variability ◽  
Environmental Variability ◽  
Gulf Of Maine ◽  
Time And Space

The interannual variability of size at maturity of the brown crab Callinectes bellicosus Stimpson, 1859 (Brachyura, Portunidae) in the Gulf of California

Crustaceana ◽  
2015 ◽  
Vol 88 (12-14) ◽  
pp. 1339-1350 ◽  
Author(s):  
Guillermo Rodríguez-Domínguez ◽  
Sergio G. Castillo-Vargasmachuca ◽  
Raúl Pérez-González ◽  
E. Alberto Aragón-Noriega
Keyword(s):  
Interannual Variability ◽  
Gulf Of California ◽  
Environmental Variability ◽  
Mature Female ◽  
Size At Maturity ◽  
Power Law Model ◽  
Negative Power ◽  
Chl A ◽  
Environmental Variations ◽  
Sea Surface Temperature Anomalies

This study examines how the size at maturity (CW50%) of Callinectes bellicosus Stimpson, 1859 is affected by environmental variability and by the source of the data. The samples were obtained from a coastal lagoon in the eastern Gulf of California between 2000 and 2003, and in 2011. To explore for interannual variation in environmental conditions, an extended negative power-law model was used, with SSTa as the annual sum of monthly sea surface temperature anomalies and Chl-a as the monthly chlorophyll a mean in a year. The interannual variability in the CW50% of C. bellicosus was also calculated. We found that the percent of mature female drives inter-annual variability in CW50% and that the addition of Chl-a to the model does not contribute further to the explanation of this phenomenon. The hypothesis that environmental variations affect the reproductive dynamics of the stocks needs to be tested in this species in another area.

scholarly journals Model study of nutrient and phytoplankton dynamics in the Gulf of Maine: patterns and drivers for seasonal and interannual variability

2014 ◽  
Vol 72 (2) ◽  
pp. 388-402 ◽  
Author(s):  
Rucheng Tian ◽  
Changsheng Chen ◽  
Jianhua Qi ◽  
Rubao Ji ◽  
Robert C. Beardsley ◽  
...  
Keyword(s):  
Interannual Variability ◽  
Gulf Of Maine ◽  
Phytoplankton Bloom ◽  
Function Analysis ◽  
Nutrient Supply ◽  
Open Boundary ◽  
Phytoplankton Production ◽  
Phytoplankton Dynamics ◽  
Salinity Regime ◽  
Dominant Feature

Abstract Coupled physical–biological modelling experiments were made for the period of 1995–2009 to analyse the spatial and interannual variability of nutrients and phytoplankton production in the Gulf of Maine (GOM). The physical model was the Finite-Volume Community Ocean Model (FVCOM) and the biological model was a Nitrogen, Phytoplankton, Zooplankton, and Detritus (NPZD) model. The simulation was carried out with realistic meteorological surface forcing, five major tidal constituents, river discharge, and observation-based open boundary conditions. The results were robust with comparison to SeaWiFS chlorophyll data and historical data of nitrogen. An Empirical Orthogonal Function analysis clearly identified two dominant modes in nutrient and phytoplankton dynamics: (1) sustained nutrient supply and phytoplankton production from spring through autumn, and (2) a dominating phytoplankton bloom in spring, relatively low production in summer, and a noticeable bloom in autumn. Mode 1 was a dominant feature in strong tidal energy dissipation regions such as the southwestern shelf of Nova Scotia, Georges Bank, Nantucket Shoals, the Bay of Fundy, and the coastal regions of GOM, where tidal pumping and mixing were the major drivers for the sustained nutrient supply, and primary production showed certain resilience with less interannual variability. Mode 2 was a characteristic in the deep Gulf, the offshore region of the Scotian Shelf, and in the open sea area, where the timing and amplitude of the spring phytoplankton bloom is essentially controlled by the salinity regime, and its interannual variability was significantly influenced by freshening events controlled by local and remote forcing.

scholarly journals Seasonal and diurnal variations of Hg° over New England

2008 ◽  
Vol 8 (5) ◽  
pp. 1403-1421 ◽  
Author(s):  
H. Mao ◽  
R. W. Talbot ◽  
J. M. Sigler ◽  
B. C. Sive ◽  
J. D. Hegarty
Keyword(s):  
New England ◽  
Interannual Variability ◽  
Gulf Of Maine ◽  
Deposition Velocity ◽  
Warm Season ◽  
Background Level ◽  
Anthropogenic Sources ◽  
Homogeneous Distribution ◽  
Seasonal And Diurnal Variations ◽  
The Impact

Abstract. Factors influencing diurnal to interannual variability in Hg° over New England were investigated using multi-year measurements conducted by AIRMAP at the Thompson Farm (TF) coastal site, an inland elevated site at Pac Monadnock (PM), and two month measurements on Appledore Island (AI) in the Gulf of Maine. Mixing ratios of Hg° at TF showed distinct seasonality with maxima in March and minima in October. Hg° at AI tracked the trend at TF but with higher minima, while at PM the diurnal and annual cycles were dampened. In winter, Hg° was correlated most strongly with CO and NOy, indicative of anthropogenic emissions as their primary source. Our analysis indicates that Hg° had a regional background level of ~160 fmol/mol in winter, a dry deposition velocity of ~0.20 cm s−1 with a ~16 day lifetime in the coastal boundary layer in summer. The influence of oceanic emissions on ambient Hg° levels was identified using the Hg°-CHBr3 correlation at both TF and AI. Moreover, the lower Hg° levels and steeper decreasing warm season trend at TF (0.5–0.6 fmol/mol d−1) compared to PM (0.2–0.3 fmol/mol d−1) likely reflected the impact of marine halogen chemistry. Large interannual variability in warm season Hg° levels in 2004 versus 2005/2006 may be due to the role of precipitation patterns in influencing surface evasion of Hg°. In contrast, changes in wintertime maximum levels of Hg° were small compared to drastic reductions in CO, CO2, NOy, and SO2 from 2004/2005 to 2006/2007. These trends could be explained by a homogeneous distribution of Hg° over North American in winter due to its long lifetime and/or rapid removal of reactive mercury from anthropogenic sources. We caution that during warmer winters, the Hg°-CO slope possibly reflects Hg° loss relative to changes in CO more than their emission ratio.

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