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Full-Text Articles in Life Sciences
Temperature-Dependent Sex Determination In Manouria Emys Emys, The Asian Forest Tortoise, Sherri Ann Emer
Temperature-Dependent Sex Determination In Manouria Emys Emys, The Asian Forest Tortoise, Sherri Ann Emer
Biology Theses
Captive husbandry programs in zoos have documented nesting behavior and have successfully hatched Manouria emys emys, but data on sex determining mechanisms and sex ratios are absent. A total of 30 M. e. emys eggs were artificially incubated at five different temperatures in constant humidity. Mean incubator temperatures were 24.99°C, 25.06°C, 27.18°C, 28.00°C, and 30.79°C. Incubation duration ranged from 60 days to 92 days, and hatching success was 50%. Sex determined by histology and laparoscopy resulted in male differentiation at low temperatures (24.99°C, 27.18°C) and female differentiation at high temperatures (30.79°C). Pivotal temperature was estimated to be 29.29°C. The following …
Lifetime Reproductive Effort, Eric Charnov, Robin Warne, Melanie Moses
Lifetime Reproductive Effort, Eric Charnov, Robin Warne, Melanie Moses
Biology Faculty & Staff Publications
The concept of lifetime reproductive effort[LRE] is defined for arbitrary age structured populations. Optimal life history theory with metabolic production constraints is developed to predict the numeric value of LRE; This is tested with large data sets for mammals and lizards.
Electrical And Behavioral Courtship Displays In The Mormyrid Fish Brienomyrus Brachyistius, Ryan Y. Wong, Carl D. Hopkins
Electrical And Behavioral Courtship Displays In The Mormyrid Fish Brienomyrus Brachyistius, Ryan Y. Wong, Carl D. Hopkins
Biology Faculty Publications
Mormyrid electric fish rely on the waveform of their electric organ discharges (EODs) for communicating species, sex, and social status, while they use the sequences of pulse intervals (SPIs) for communicating rapidly changing behavioral states and motivation. Little is known of electric signaling during courtship behavior because of two major difficulties: (1) the fish are not easily bred in captivity and (2) there is no reliable means of separating electric signals from several individuals in natural communication settings. Through simulating artificial rain conditions, we have successfully induced courtship and succeeded in breeding a mormyrid electric fish (Brienomyrus brachyistius) in the …