SOUTHERN GRID 
PRELIMINARY REPORT AT-SEA SURVEY NO# 7 
2-9 toy 1966 
This report is based upon the observations and collections made within 
the Southern Grid during the period 2-9 toy inclusive# The cruise track used 
in April was followed again during the present survey (see Figure 1)# This 
track has an advantage of short overall distance whereby it is unnecessary 
to cruise at night during the allotted grid time. Thus important and highly 
productive night collecting can be performed as well as having practically 
the entire grid track covered by diurnal observations# 
The Smithsonian survey party included Richard Crossin (Biologist in 
Charge), Dayle Rusted, Norman Keryford, Brian Harrington, Jim Lewis, Frank 
Smith, Dave Hoff, Ken Balcomb and Jeff Tordoff. The grid cruise was made 
aboard the U.S.N.S# SHEARWATER (T-AG 177). Excellent cooperation and assist¬ 
ance were received from the officers and crew members# 
A total of 6S4 miles and 84 hours of diurnal observations ras completed 
during the grid period (Table 1)# During this time 5,127 birds of 21 species 
were recorded and 110 birds of 6 species were collected. Choppy seas occurred 
during most of the grid period and prevented effective use of the small skiff 
for collecting purposes. 
Nocturnal observations were maintained from sunset to sunrise, except 
during island operations. A total of 159 miles and 53 hours was completed# 
During night operations 661 birds of 11 species were recorded and 29 birds 
of 7 species were collected# Gray-backed Terns and Audubon’s Shearwaters 
