scholarly journals Development of a climate-niche model to evaluate spatiotemporal trends in Placopecten magellanicus distribution in the Gulf of Maine, USA

2019 ◽  
Vol 50 ◽  
pp. 37-50 ◽  
Author(s):  
M P Torre ◽  
K R Tanaka ◽  
Y Chen
Keyword(s):  
Gulf Of Maine ◽  
Placopecten Magellanicus ◽  
Niche Model ◽  
Climate Niche ◽  
Spatiotemporal Trends

High Densities of Juvenile Sea Scallop (Placopecten magellanicus) on Banks and Ledges in the Central Gulf of Maine

2010 ◽  
Vol 29 (2) ◽  
pp. 369-372 ◽  
Author(s):  
Kevin D. E. Stokesbury ◽  
Jonathan D. Carey ◽  
Bradley P. Harris ◽  
Catherine E. O'Keefe
Keyword(s):  
Gulf Of Maine ◽  
Placopecten Magellanicus ◽  
Sea Scallop

scholarly journals Reduced fecundity in a deep-water population of the giant scallop Placopecten magellanicus in the Gulf of Maine, USA

1988 ◽  
Vol 42 ◽  
pp. 207-212 ◽  
Author(s):  
BJ Barber ◽  
R Getchell ◽  
S Shumway ◽  
D Schick
Keyword(s):  
Deep Water ◽  
Gulf Of Maine ◽  
Placopecten Magellanicus

Mesoscale climatic impacts on the distribution of Homarus americanus in the US inshore Gulf of Maine

2019 ◽  
Vol 76 (4) ◽  
pp. 608-625 ◽  
Author(s):  
Kisei R. Tanaka ◽  
Jui-Han Chang ◽  
Ying Xue ◽  
Zengguang Li ◽  
Larry Jacobson ◽  
...  
Keyword(s):  
Gulf Of Maine ◽  
Additive Model ◽  
Circulation Model ◽  
Homarus Americanus ◽  
The United States ◽  
Niche Modelling ◽  
Modelling Framework ◽  
Climate Niche ◽  
The Us ◽  
Climatic Impacts

American lobster (Homarus americanus) supports one of the most valuable fisheries in the United States. Spatial distributions of H. americanus are hypothesized to be influenced by climate-driven environmental factors, but such effects have not been quantified. We developed a Tweedie generalized additive model (GAM) to quantify environmental effects on season-, sex-, and size-specific distributions of H. americanus in the inshore Gulf of Maine. Tweedie GAMs were coupled with regional circulation model output to predict spatiotemporal changes in distribution of H. americanus due to mesoscale climate variability. GAM results indicated that bottom temperature and salinity impacts on H. americanus distribution were more pronounced during spring. The coupled climate–niche model predicted significantly higher H. americanus abundance under a warm climatology scenario. This study provides a predictive climate–niche modelling framework that may be useful for planning fishery investments and anticipating management challenges given ongoing climate-driven changes in the Northwest Atlantic.

In situ swimming characteristics of the sea scallop, Placopecten magellanicus, on German Bank, Gulf of Maine

2014 ◽  
Vol 94 (5) ◽  
pp. 1019-1026 ◽  
Author(s):  
Gwyn E. Mason ◽  
Jessica A. Sameoto ◽  
Anna Metaxas
Keyword(s):  
Size Distribution ◽  
Gulf Of Maine ◽  
Natural Habitat ◽  
Maximum Velocity ◽  
Swimming Activity ◽  
Placopecten Magellanicus ◽  
Remotely Operated Vehicle ◽  
German Bank ◽  
Sea Scallop

Size distribution and swimming activity of the sea scallop, Placopecten magellanicus, were measured in situ from high-definition video recordings collected by a remotely operated vehicle on a fished scallop bed on German Bank, Gulf of Maine in August 2010. Scallop densities ranged from 0.004 to 3.89 m−2 and shell height (SH) ranged from 16.3 to 193.8 mm. The size distribution was bimodal, with high abundance from 20 to 40 mm SH indicating a recent recruitment event in the area. The low abundance of scallops >100 mm SH was likely due to the active fishery in this area. Of 535 observed swims, 200 were characterized for swim distance, time, velocity and distance travelled per adduction. The size of scallops observed to swim ranged from 18.9 to 99.9 mm SH. Both swim time and swim distance increased linearly with SH, and quadratic relationships were observed between velocity and SH, and between distance travelled per adduction and SH. Swimming velocities peaked at ~ 50 cm s−1 for scallops between 60 and 80 mm, and maximum velocity was 103.2 cm s−1observed for an individual of 64.0 mm SH. Our study provided a unique opportunity to investigate size distribution and associated swimming activity of scallops in their natural habitat, rather than in a simulated study in the laboratory, and at depths not reachable by SCUBA diving.

Fine structure of the retina of the giant scallop, Placopecten magellanicus

1984 ◽  
Vol 42 ◽  
pp. 312-313
Author(s):  
C.V.L. Powell
Keyword(s):  
Fine Structure ◽  
Electron Microscope ◽  
Light Intensity ◽  
Scanning Electron Microscope ◽  
Eye Development ◽  
Preliminary Observation ◽  
Columnar Epithelium ◽  
Placopecten Magellanicus ◽  
Environmental Light ◽  
Scanning Electron

The overall fine structure of the eye in Placopecten is similar to that of other scallops. The optic tentacle consists of an outer columnar epithelium which is modified into a pigmented iris and a cornea (Fig. 1). This capsule encloses the cellular lens, retina, reflecting argentea and the pigmented tapetum. The retina is divided into two parts (Fig. 2). The distal retina functions in the detection of movement and the proximal retina monitors environmental light intensity. The purpose of the present study is to describe the ultrastructure of the retina as a preliminary observation on eye development. This is also the first known presentation of scanning electron microscope studies of the eye of the scallop.

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