THE RELATIONSHIP BETWEEN TRENDS IN A CONDITION INDEX OF THE AMERICAN OYSTER, CRASSOSTREA-VIRGINICA, AND ENVIRONMENTAL PARAMETERS IN 3 VIRGINIA ESTUARIES

被引：34

作者：

AUSTIN, H ^{[1
]}

HAVEN, DS ^{[1
]}

MOUSTAFA, MS ^{[1
]}

机构：

[1] SCI APPLICAT INT CORP,MCLEAN,VA 22102

来源：

ESTUARIES | 1993年 / 16卷 / 02期

关键词：

D O I：

10.2307/1352508

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Oyster Condition Index (CI) was partitioned, using a moving average filter, into seasonal cycles and long-term trends in the James, York, and Rappahannock rivers for the period 1970-1983. Seasonal cyclic fluctuations in CI could be explained partially by changes in salinity and number of days within various temperature regimes. Long-term trends in the James River show a steady increase in CI over the study period, while a concurrent decline was noted in the Rappahannock River. Superimposed on these trends is a 4 to 5 yr cycle that is in synchrony with river discharge (salinity). In the York River, CI peaked in 1975-1976 at all stations. Measured environmental parameters do not sufficiently explain the trends. We speculate that the differences in the Rappahannock and james rivers may be due to a decline in bottom oxygen as a result of gravitational circulation differences.

引用

页码：362 / 374

页数：13

共 41 条

[1] SEASONAL PATTERNS OF OYSTER SETTING IN THE JAMES RIVER AND CHESAPEAKE BAY [J].