AREA 325, Eureka (cont'd.) 



Castle Rock 4145'37"N, 12415'U 



Castle Rock is the second most important seabird colony in California. 

 It presently has the largest breeding populations of Common Murres and 

 Rhinoceros Auklets in California as well as important populations of Fork- 

 tailed and Leach's Storm-Petrels, and Tufted Puffins. It is a major hauling 

 area for California sea lions (Zalophus californianus) and Stellers sea lions 

 (Eumetopias jubata) and is a pupping grounds for Harbor seals (Phoca 

 vitulina). Elephant Seals (Mirounga angustirostris) are often present in low 

 numbers. 



Castle Rock is the primary spring staging grounds for the endangered 

 Aleutian Canada Goose (Branta canadensis leucopareia). The island serves 

 as a safe night roost for the geese as most feeding occurs in nearby fields. 



Until 1979, Castle Rock was privately owned and in the 1920's sheep 

 grazed its slopes. Speculators have contemplated guano mining, rock quarrying, 

 and construction of a tourist attraction on the island. Fortunately, in 1979, the 

 Nature Conservancy purchased Castle Rock and it will soon be protected as a 

 refuge by the U.S. Fish and Wildlife Service. See Appendix B. 



Fork-tailed Storm-Petrel 

 Leach's Storm-Petrel 

 Brandt's Cormorant 

 Pelagic Cormorant 

 Black Oystercatcher 

 Western Gull 

 Common Murre 

 Pigeon Guillemot 

 Cassin's Auklet 

 Rhinoceros Auklet 

 Tufted Puffin 



Total 



Brandt's Cormorant 

 Brandt's Cormorant 

 Pelagic Cormorant 

 Pelagic Cormorant 

 Black Oystercatcher 

 Black Oystercatcher 

 Western Gull 

 Common Murre 

 Cassin's Auklet 

 Rhinoceros Auklet 

 Cassin's Auklet 

 Rhinoceros Auklet 

 Tufted Puffin 



/I Estimate is number of birds present 



100 (Osborne, 1970, L) 



5,000 (Osborne, 1970, L) 



2,200 (DeGange & Nelson, 7/25/80, A, II) 



340 (Lester, Nakagawa & Vasey, 6/19/80,6, III) 



6 (Lester, Nakagawa & Vasey, 6/19/80,6, III) 

 1,350 .(Lester & Rodstrom,7/12/79,A,&7/19/79,A,III) 

 126,000^(Lester & Rodstrom,7/12/79,A,&7/19/79,A,III) 



800 (Lester, Nakagawa & Vasey, 6/19/80,6, III) 



3,600 (Osborne, 1970, L) 

 200+ (Osborne, 1977, L) 



100 (Lester, 1980, BL, III) 

 139,596 



1,758 (Osborne, 1970,1) 



2,010 (Lester & Rodstrom, 7/12/79 ,A&7/19/79,A,HI) 



TOO (Osborne, 1970, L) 



96 (Lester & Rodstrom, 5/21/79, 8, III) 



2 (Osborne,! 970, L) 



2 (Lester & Rodstrom, 5/21/79,6,111) 



1,200 (Os borne, 1970,1) 



80,000 (Osborne, 1970.L) 



100 (Thoresen,4/16 &8/25/59,L) 



X (Clay,1917,L} 



X (Clay, 5/20/34,1) 



100-150 (Osborne, 1970, L) 



50 (Osborne, 1 970, L) 



times 1.67, see page 10. Briggs et al.'s estimate for 7/2/80 aerial survey (also times 1.67) is 131,600 



35 

 35 

 42 

 42 

 42 

 42 

 42 

 42 

 35 

 34 

 42 



35 

 42 

 35 

 42 

 35 

 42 

 35 

 35 

 41 

 35 

 35 

 35 

 35 



"Tolowa Rocks" 4145'15"N, 12414'W 



Fork-tailed Storm-Petrel 60 



Leach's Storm-Petrel ? 



Pelagic Cormorant 92 



Black Oystercatcher 8 



Western Gull 116 



Pigeon Guillemot 40 



Total 316 



Pelagic Cormorant 24 



Pelagic Cormorant 36 



Western Gull 24 



(Lester, 6/20/80, L, III) 

 (Lester, 6/20/80, L) 

 (Lester, 6/19&6/20/80,B, II) 

 (Lester,6/19&6/20/80,BL,II) 

 (Lester, 6/19&6/20/80,BL, II) 

 (Lester,6/19&6/20/80,BL,III) 



(Osborne, 9/1 4/70, M, census of one rock) 

 (Lester S Rodstrom, 5/21/79, B, I) 

 (Lester & Rodstrom, 5/21/79,8, II) 



42 

 42 

 42 

 42 

 42 

 42 



35 

 42 

 42 



66 



