96
Estudio ecosistémico del lago de Pátzcuaro
lla mínima registrada de reproducción fue de
25 mm, asimismo la temperatura no represen-
ta un factor limitante ya que
C. patzcuarensis
se
adapta a las fluctuaciones presentes. Hay una
variación espacio-temporal de parámetros fisi-
coquímicos en el Lago de Pátzcuaro, que presen-
tan poca fluctuación de temperatura, oxígeno y
pH. Se presentó un descenso de la salinidad y la
conductividad durante la temporada de lluvias.
El amonio registrado presentó su mayor con-
centración con 42.05 mg/l al norte del Lago de
Pátzcuaro en la localidad de Chupícuaro, segui-
dos por las zonas de Cucuchucho, Pared-Tarerio
y Oponguio, esto indica una eutrofización del
lago. La composición del suelo está compuesto
por un alto porcentaje de arcillas y arenas finas
en tamaños que van desde 0.062 a 0.42 mm, con
presencia de zonas de áreas rocosas. Los por-
centajes de materia orgánica registrada fueron
del 6% al 16%.
Abstract
For this study we made an ecological zoning
Lake in 17 regions. The collections were made
by using scoop nets, with minimal areas of 1m
2
.
The organisms were identified using taxonomic
keys (Villalobos, 1955) and morphometric data
were taken as: total length, carapace length, to-
tal weight and sex. Also physicochemical para-
meters were water. Based on the records were
mapped collects the areas for the representa-
tion of the population structure of
C. patzcua-
rensis
, results indicate population sex relations-
hip 1H average ( ): 1 M ( ) maximum sizes
of 38.3 mm for females and males of 37 mm for
females and minimum sizes of 8.67 mm and 11.3
mm for male. There was a population density of
10 organisms per m
2
, recording density per m
2
5 for females and 5 for males per m
2
. The areas
with the highest density per area are Yunuen Is-
land and Isla Janitzio. Puácuaro Island and Isla
Janitzio Yunuen established as breeding areas
for its rocky bottom and high presence of ovige-
rous females. The population indicators were:
Synthetic Fertility Index ( ISF ) = 199.17; Gross Re-
production Rate ( R ) = 97.19; Interval for spaw-
ning Medium size ( TMD ) = 37.81; Play Net Rate
( Ro) = 3.79; rate Population Growth Ratio = 1.53
and growth rate (% ) = 153.13%. The indicators
obtained for the population of
C. patzcuarensis
determine which is increasing. The highest re-
cord of spawning was observed during the rainy
season, which runs from June to October, with
an average number of eggs per female of 65 ,
maximum of 101 and minimum of 30. Reveals
seven larval development stages lasting 35 days
before hatching of the egg. In this species spaw-
ning female has continued with intervals of less
than 20 days of each other. There was a low
number of eggs but high viability. The minimum
size reproduction recorded was 25 mm, also
the temperature is not a limiting factor since
C.
patzcuarensis
adapts to these fluctuations. The-
re is a spatio-temporal variation of physicoche-
mical parameters on Lake Patzcuaro, they show
little fluctuation in temperature, oxygen and
pH. It showed a decline in salinity and conduc-
tivity during the rainy season. The registration
showed the highest ammonium concentration
42.05 mg / l north of Lake Patzcuaro in the town
of Chupícuaro, followed by Cucuchucho areas,
and Wall - Tarerio Oponguio, this indicates eu-
trophication. The soil composition is comprised
of a high percentage of clay and fine sand in
sizes ranging from 0.062 to 0.42 mm, with the
presence of areas of rocky areas. Organic matter
percentages were recorded from 6% to 16%.
Introducción
Se realizaron estudios y análisis de la estructu-
ra poblacional del acocil endémico,
Cambarellus
patzcuarensis
en el Lago de Pátzcuaro de 2004 al
