Title: Bulletin
Identifier: bulletin7477sout (find matches)
Year: 1971- (1970s)
Authors: Southern California Academy of Sciences
Subjects: Science; Natural history; Natural history
Publisher: Los Angeles, Calif. : The Academy
Contributing Library: New York Botanical Garden, LuEsther T. Mertz Library
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
16 BULLETIN SOUTHERN CALIFORNIA ACADEMY OF SCIENCES VOLUME 74 - I cr u Q_ to cr u O O I u Li_ O l/l cr u CD 3 A 32- 30- A y A 28- / / ^ \ \ 26- / / / / / / \ \ 24- / / / / \ 22- 20- y / / / iy 18- 16- %â ' 1 TV 14- f \ r 12- 1 MEAN 10- r d 8- A 6- 4. 2- 7 MAY 'JUNE 'JULY ' AUG 'sept 'OCT ' NOV'i 16 46 56 4 30 18 17
Text Appearing After Image:
-90 80 â 100 60 Q LlI O CC o e) z LU Z Ul z o Iâ I/) < LU -30 20 - I MAR APR MAY JUNE JULY AUG SEPT Figure 1. The occurrence of Hanneinania hylae on Hyta cadaveiina at Fortynine Palms Oasis, from May 1969 through September 1970. N = number of frogs examined, triangles and solid lines indicate mean numbers of larvae per frog, and dots and dashed lines show the percent of Hyla with at least one unengorged chigger. 1964). Other plants in and around the ponds were cattails, reeds, ntimerous herbs, and algae. Pond one, the largest and deepest (1 m), contained the most Hyla cadaverina and Bitjo punctatus. The tree frogs were in evidence around the pond by day and night in the spring and fall, whereas on summer days they regularly retreated into rock crevices at the west end of the pool. Pond two, a small depression filled with cattails and water about 0.2 m deep, contained few Hyla cadaverina and Bufo punctatus. Pond three, the most stable of all oasis ponds, contained nearly 0.5 m of water and varied less than 0.03 m in depth all year. This pond was shaded by palms nearly all day and harbored few Hyla cadaverina or Bufo punctatus. METHODS Twenty-two visits to Fortynine Palms Oasis were made between May 1969 and April 1971, to locate and capture Hyla cadaverina and Bufo punctatus. These anurans were released soon after the toes were clipped (Jameson, 1955) and the numbers of unengorged and engorged larvae were recorded. The amphibian populations were estimated using the Schnabel Method of accumulative cap- ture and recaptures (Smith, 1966). N = S(A) (B) 2(C) A = number of amphibians captured B = number of amphibians marked C = number of recaptures N = population estimate ! 2 = sum With this method the total estimate of the amphibians was obtained by averaging the last four population estimates. The larval population of each species was determined by using the mean host population estimate and mean number of chiggers counted per host each visit. These data were arranged by months and plotted in figures 1 and 2. In addition, two attempts were made to locate unfed, free-living chigger larvae using ten un-

Note About Images