7998

• UCREFRP Catalog Number: 7998
• Author: Desert Fishes Council, G. a. S., ed.)‎.
• Title: Proceedings of the Desert Fishes Council Volume XXVII, 1995 Annual Symposium.
• USFW Year: 1996.
• USFW - Doc Type: November, 16-19.
• Copyright Material: NO

PROCEEDINGS OF THE DESERT FISHES COUNCIL, 1995 SYMPOSIUM VOLUMEXXVII-PUE11% D 1996
ALPHABETICAL LISTING OF ABSTRACTS
ALANfz-GARCIA, J.'; Ruiz-CAMPos, G. (Fa wtad &- cke ew, u.&.;a.aA o.. de B* Cagf.ad' m6&.)
Food habits of the killifish Fundulus lima (Vaillant) in the San Ignacio oasis, Baja California Sur,
Mexico
KEYWORDS: feeding habits; San Ignacio oasis; San Ignacio; killifish; Baja California Sur; Mexico
ABSTRACT
The seasonal feeding habits of San Ignacio killifish Fundulus lima were studied in the oasis of San
Ignacio, Baja California Sur. A total of 108 stomach contents were qualitatively and quantitatively analyzed
during an annual cycle. The diet is composed of 16 prey groups. The most important prey groups (biomass
and frequency of occurrence) were diatoms, filamentous green algaes and vascular plant remains. Diet
composition was significantly similar among size classes (Schoener's overlap index) as well as among
seasons. Fish prey were frequently observed in killifish specimens >35 mm SL.
RESUMEN
Se estudiaron los habitos alimenticios estacionales de la sardinilla de la peninsula, Fundulus lima en el
oasis de San Ignacio, Baja California Sur. Se analizaron cualitativa y cuantitativamente 108 contenidos
estomacales durante un ciclo anual. La dieta esta compuesta de 16 tipos de presas, siendo los mss
importantes en frecuencia y biomasa; las diatomeas, algas verdes filamentosas y restos de plantas vasculares.
La composition de la dieta fue significativamente similar entre clases de talla (fndice de traslape de
Schoener) asf como entre las estacsones. Peces presa fueron frecuentemente observados en especimenes de
peces lima >35 mm LP.
ANDERSEN, M. E. (D. & Moore, L. Vegas, rM
Linear regression model of the Devils Hole pupfish population, 1977-1995
KEYWORDS: Devils Hole; California; Devils Hole pupfish; linear regression; population dynamics
ABSTRACT
Population counts of the Devils Hole pupfish (Cyprinodon diabolis Wales, 1930) made later than 1
January 1977 were considered in the present study. The first counts of the day (n=89) were found to be
most consistent if more than one count was made in the same day. When all the available first count values
were plotted against time, a sine wave was apparent. Over 65% of the information in the first counts data
set could be explained by a linear regression model which used the cumulative date as the trend line and
the sine function of the yearly cycle as the predictive (independent) variables. The construction of this
relatively simple model allows determination of deviations from predicted size, and may identify the timing
of ecological events that have a significant impact on the population. Examination of standardized residuals
suggests that events in the early 1980's had a negative impact on pupfish population size, but that trend
is showing signs of reversal.
RESUMEN
En el presente estudio se consideraron los conteos de poblaci6n del Devils Hole pupfish (Cyprinodon
diabolis Wales, 1930) efectuados despues de enero 01 de 1977. Los primeros conteos del dfa (n=89) se
observaron mss consistentes si mas de un conteo era efectuado al dfa. Al graficar los valores de los primeros
conteos disponibles contra el tiempo, se obtuvo una onda sinusoidal. Arriba del 65% de la information en
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