Age and Size Composition of Weakfish, Cynoscion regalis, from Pound Nets in Chesapeake Bay, Virginia 1954-1958

1963 ◽  
Vol 4 (1) ◽  
pp. 43
Author(s):  
William H. Massmann
Keyword(s):  
Chesapeake Bay ◽  
Size Composition ◽  
Cynoscion Regalis

Stability of elemental signatures in the scales of spawning weakfish, Cynoscion regalis

2003 ◽  
Vol 60 (4) ◽  
pp. 361-369 ◽  
Author(s):  
Brian K Wells ◽  
Simon R Thorrold ◽  
Cynthia M Jones
Keyword(s):  
Chesapeake Bay ◽  
Juvenile Fish ◽  
Atlantic Coast ◽  
Age Groups ◽  
Delaware Bay ◽  
Adult Fish ◽  
Juvenile Period ◽  
Cynoscion Regalis ◽  
Natural Tags ◽  
Pamlico Sound

We quantified elemental signatures in scales of ages-1 and -2 weakfish, Cynoscion regalis, collected during the spawning season in Pamlico Sound, Chesapeake Bay, and Delaware Bay in 1998. We compared these signatures with elemental signatures from scales of juvenile weakfish collected while still resident in natal estuaries at five locations along the Atlantic coast in 1996 and 1997. Although Mg/Ca and Mn/Ca were lower in the juvenile portion of scales from adults compared with scales from juvenile fish, Sr/Ca and Ba/Ca were similar in the three age groups. We compared scale and otolith chemistries from juveniles and adults to determine if relative concentrations of elements/Ca in scales remained consistent, even if absolute levels were altered. Scale Mn/Ca and Ba/Ca remained correlated with those in otoliths of adult fish. Finally, we examined the ability of elemental signatures in scales to act as natural tags of natal estuaries in spawning weakfish. Allocation of fish to natal estuaries based on geochemical signatures in scales and otoliths from age-1 fish was similar; however, allocation was different for age-2 fish. Elemental signatures in scales degraded after the juvenile period and after maturation were insufficiently stable for use as a natural tag of natal origins in weakfish.

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.

Developing TMDLs for Local Impairments Consistent with the Regional Chesapeake Bay TMDL

2012 ◽  
Author(s):  
Gene Yagow ◽  
Brian Benham ◽  
Karen Kline ◽  
Becky Zeckoski ◽  
Carlington Wallace
Keyword(s):  
Chesapeake Bay

Spatial ecology and growth in early life stages of bay anchovy Anchoa mitchilli in Chesapeake Bay (USA)

2020 ◽  
Vol 651 ◽  
pp. 125-143
Author(s):  
TD Auth ◽  
T Arula ◽  
ED Houde ◽  
RJ Woodland
Keyword(s):  
Chesapeake Bay ◽  
Spatial Ecology ◽  
Environmental Variability ◽  
Larval Growth ◽  
Larval Abundance ◽  
Spatial And Temporal Variability ◽  
Estuarine Ecosystem ◽  
Anchoa Mitchilli ◽  
Larval Production ◽  
Bay Anchovy

The bay anchovy Anchoa mitchilli is the most abundant fish in Chesapeake Bay (USA) and is a vital link between plankton and piscivores within the trophic structure of this large estuarine ecosystem. Baywide distributions and abundances of bay anchovy eggs and larvae, and larval growth, were analyzed in a 5 yr program to evaluate temporal and spatial variability based on research surveys in the 1995-1999 spawning seasons. Effects of environmental variability and abundance of zooplankton that serve as prey for larval bay anchovy were analyzed. In the years of these surveys, 97.6% of eggs and 98.8% of larvae occurred in the polyhaline lower bay. Median egg and larval abundances differed more than 10-fold for surveys conducted in the 5 yr and were highest in the lower bay. Within years, median larval abundance (ind. m-2) in the lower bay was generally 1-2 orders of magnitude higher than upper-bay abundance. Salinity, temperature, and dissolved oxygen explained 12% of the spatial and temporal variability in egg abundances and accounted for 27% of the variability in larval abundances. The mean, baywide growth rate for larvae over the 5 yr period was 0.75 ± 0.01 mm d-1, and was best explained by zooplankton concentration and feeding incidence. Among years, mean growth rates ranged from 0.68 (in 1999) to 0.81 (in 1998) mm d-1 and were fastest in the upper bay. We identified environmental factors, especially salinity, that contributed to broadscale variability in egg and larval production.

Patterns of conduct of Argentine SMEs with respect to ICT investments

2020 ◽  
pp. 47-78
Author(s):  
Guillermo Alberto Tricoci ◽  
Pablo Alejandro Corral ◽  
María Cecilia Oriolo
Keyword(s):  
Size Composition ◽  
Field Work ◽  
Mixed Methodology ◽  
Small Companies ◽  
Consulting Services ◽  
Empirical Scheme ◽  
Composition Of Capital

Various authors have concluded that there are different groupings that make it possible to explain the differences between companies in terms of their size, composition of capital or the degree of their evolution in terms of ICT and that within medium and small companies there are special dynamics that are necessary understand. This work is focused on this type of firms and a mixed methodology has been used to obtain data, which included the preparation of a field work supported by consultations with relevant personalities from academia, industry and consulting services in the area. It is proposed to draw an empirical scheme of the SME sector in Argentina, and results are presented in relation to the investment and adoption of ICT in these type of firms.

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