Image from the Biodiversity Heritage Library.
Contributed by Museum of Vertebrate Zoology, University of California, Berkeley.
| www.biodiversitylibrary.org
Transcription
INSPECTION TRIP OF ANAHO ISLAND WILDLIFE REFUGE, PYRAMID L., NEVADA
July 3, 1950 10:00 am to 3:30pm
Observers: LeRoy Giles, Fred Wright, David B. Marshall and Thomas H. McAllister
of Oregon State Game Commission.
Schedule: Visited all colonies to band young and make more complete estimates
on the number of birds present. Estimates here given therefore supersede
t hose made on May 15 and June 26, 1950.
Data given below also includes summary of observations made on May 15 and June 26.
Dates MARKED for observations below are for July 3 unless otherwise specified.
Birds
Eared Grebe - 2 seen in water off island.
Western Grebe - Saw only one, but several seen on June 26 and May 15.
White Pelican - Giles estimated 5,000 adults on May 15, which is the best observation
to date on adults. Adults can be estimated to best advantage earlier in the
season when more are present. Of the 5,000, 1,000 were at the mouth of the
Truckee River. Since pelicans range OVER a vast area from this colony,
many adults belonging to the colony went uncounted because of tours over the
region. As an example on May 16, the day after Giles made his count 400
pelicans were counted on the Stillwater Wildlife Management Area.
1,160 young pelicans in 14 pods or colonies were counted on July 3. Also 16
e ggs, some of which may not have been fertile. Nesting was more progressed at
lower levels on the island. As one went up the island to the top nesting
areas was at successively LATER earlier stages. Two pods were at the
top of the island having 59 nests containing a total of 80 young and 9 eggs.
Pipping of eggs and newly hatched young were observed at this location.
These two colonies were overlooked on previous visits. About 8 young, all that
were in the lowest colony had apparently left the island. This colony was
observed on May 15. Pods or colonies found on July 3 are as follows:
1. 60 young
2. 200 young
3. 300 young
4. 60 young
5. 850 young
6. 750 young
7. 200 young and 3 eggs
8. 300 young and 4 eggs
9. 10 young
10. 50 young and MORE 8 eggs
11. 30 young and 1 egg
12. 350 yo ng
13. 200 young
14. 800 young
1,160 young and 16 eggs.
On June 26 roughly 75% of the fish regurgitated by the young pelicans were
carp
, the remainder being chubs (Siphateles obesus) and cui-ui (Chamistes
cuius). On July 3 no dead carp or cui-ui were observed to be regurgitated, MX