TRAITORS RIVER • 



INDEX MAP 



INDEX MAP 



Figure 1. — Traitors Cove estuary, Revlllagigedo Island, Alaska, and locations of stations where oceanographic surveys 



were made, 1963-65. 



SAMPLING SCHEDULE 



The oceanographic surveys of Traitors Cove 

 estuary were made on August 21-22, 1963; 

 April 14-17, 1964; June 13-15, 1964; and 

 October 6-7, 1965. 



On each survey we occupied 12 stations along 

 the midchannel of the estuary (1 in Behm Canal, 

 6 in Outer Bay, and 5 in Inner Bay- -see fig. 1). 

 The stations in Behm Canal and Outer Bay 

 were each occupied once- -without regard to 

 tidal conditions. The stations in Inner Bay were 

 each occupied twice--once on the low tide and 

 once on the high. We were not always able to 

 complete the series of five stations in Inner 

 Bay within the 2 hours between 1 hour before 

 slack water and 1 hour after but completed them 

 as soon as possible on the following tide. Also, 

 we did not measure all of the oceanographic 

 properties on every survey because personnel 

 and equipment were limited. Water tempera- 

 ture, salinity, and transparency were measured 

 on all four surveys; dissolved oxygen, phos- 

 phate, silicate, and chlorophyll _a were de- 

 termined on three of the surveys; and surface 

 currents were observed intermittentlybetween 

 June 1964 and October 1965. 



Table 2 shows the tide predictions for Inner 



and Outer Bays during the survey periods 

 (U.S. Coast and Geodetic Survey, 1963, 1964, 

 1965). These predictions are only approximate 

 and contain errors. For instance, on certain 

 low tides the water level in Inner Bay is pre- 

 dicted to stand lower than the lowest level of 

 water in Outer Bay on that tide. This situation 

 is physically impossible, but the error in- 

 volved is relatively small. 



METHODS 



We used conventional oceanographic methods 

 on most of the surveys. Water temperature 

 was determined by reversing thermometer, 

 salinity by titration, concentration of dissolved 

 oxygenby the Winkler method, and transparency 

 by a white 30-cm. Secchi disk. Concentrations 

 of silicate, phosphate, and chlorophyll a were 

 determined by the methods of Strickland and 

 Parsons (I960). On the October cruise we 

 measured temperature and salinity with an 

 Industrial Instruments Portable Induction 

 Salinometer, Model RS-5.* This instrument 

 measures to accuracies of about 1 0.4° C. and 

 10.4 o/oo. 



'Trade name referred to in this publication does not 

 Imply endorsement of commercial product. 



