RED-NECKED GREBE ( Podiceps qriseqena ) 



S tatus . --Rare spring and fall transient and winter visitant in coastal 

 waters. 



N ormal period of occurrence . --Early November to early April. 



Records .— 1. 9 km E Ocean City, 25 March 1973 (Rowlett 1973b). 



HORNED GREBE ( Podiceps a uritus ) 



Status . --Fairly common spring and fall transient and winter visitant in 

 shallow coastal waters. Rare beyond 50 km from shore (Fig. 5). 



Normal period of occurrence . — Mid-October to mid-May. 



Earl iest fall record . — 14 November 1971. 



Latest spring record . --25 March 1973. 



Maximum coun ts. --49 in 2 h, 15-25 km ENE Ocean City, 12 February 1977. 



Remarks . --Undoubtedly many grebes were overlooked because they are wary 

 and difficult to detect on choppy and rough seas. The observations on 12 

 February 1977 were made when viewing conditions were optimal. 



E 

 o 



03 



1000 n 



500 



100 



40 



30 



20 



10 







X 

 X 

 X 



X X 

 X X 



X 



T 1 1 1 1 



FMAMJJAS 



^ 



rl37 



-118 ^ 



-111 a> 



-95 0) 



-77 E 



- 5A O 



- 19 •=; 



O N D 



month 



1=0.1-1.0 1=1.1-5.0 



MEAN NUMBER OF INDIVIDUALS OBSERVED PER HOUR 



X = ZONE NOT SAMPLED IN THIS MONTH 



Figure 5. Seasonal abundance and seaward distribution patterns of the horned 

 grebe in the northern Chesapeake Bight, 1971-1977. 



11 



