Vertical Migration of Centropages typicus (Copepoda) in Chesapeake Bay, with Some Thoughts on Migration Studies

Estuaries ◽  
1979 ◽  
Vol 2 (1) ◽  
pp. 61 ◽  
Author(s):  
Harris H. White ◽  
Jeff S. Heaton ◽  
Kathleen B. Schmitz
Keyword(s):  
Chesapeake Bay ◽  
Vertical Migration ◽  
Migration Studies ◽  
Centropages Typicus

scholarly journals Effects of water of reduced salinity on the vertical migration of zooplankton

1962 ◽  
Vol 42 (2) ◽  
pp. 131-154 ◽  
Author(s):  
Joan Lance
Keyword(s):  
Vertical Migration ◽  
Developmental Stages ◽  
Marked Effect ◽  
Sea Water ◽  
Acartia Tonsa ◽  
Upward Migration ◽  
Southampton Water ◽  
Water Columns ◽  
Temora Longicornis ◽  
Centropages Typicus

SUMMARYEffects of water of reduced salinity on the vertical migration of the zooplankton of Southampton Water were investigated in the laboratory using the adults of six copepod species (Acartia tonsa, A. bifilosa, A. discaudata, A. clausi, Centropages hamatus, Temora longicornis) and the larvae of one decapod species (Porcellana longicornis). Additional observations were made on Centropages typicus adults taken off Plymouth.Salinity discontinuity layers had a marked effect on the vertical migration of zooplankton. A single discontinuity layer formed by placing less dense diluted sea water over full strength sea water acted as a barrier to animals attempting to swim toward the surface of an experimental water column and no individuals were able to enter the zone of reduced salinity when an extreme dilution was used. Comparison of the behaviour of various species and of different sexes or developmental stages of a particular species suggests that vertical distribution was partly dependent on the salinity tolerances of individuals. Upward migration was also restricted by a vertical series of discontinuity layers.The swimming activity of copepods was depressed in homogeneous water columns of reduced salinity. Activity depended both on the degree of dilution and on the period of immersion. There were indications that behaviour varied according to the salinity tolerances of the different species.

Between ‘Savage Man’ and ‘Most Faithful Englishman’ Manteo and the Early Anglo-Indian Exchange, 1584–1590

Itinerario ◽  
2000 ◽  
Vol 24 (2) ◽  
pp. 146-169 ◽  
Author(s):  
Michael Leroy Oberg
Keyword(s):  
North Carolina ◽  
Chesapeake Bay ◽  
One Year ◽  
Anglo Indian

In August of 1587 Manteo, an Indian from Croatoan Island, joined a group of English settlers in an attack on the native village of Dasemunkepeuc, located on the coast of present-day North Carolina. These colonists, amongst whom Manteo lived, had landed on Roanoke Island less than a month before, dumped there by a pilot more interested in hunting Spanish prize ships than in carrying colonists to their intended place of settlement along the Chesapeake Bay. The colonists had hoped to re-establish peaceful relations with area natives, and for that reason they relied upon Manteo to act as an interpreter, broker, and intercultural diplomat. The legacy of Anglo-Indian bitterness remaining from Ralph Lane's military settlement, however, which had hastily abandoned the island one year before, was too great for Manteo to overcome. The settlers found themselves that summer in the midst of hostile Indians.

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