Life-history of a population of Cottonmouths in east-central Alabama Scott Boback, Matt Greene, Roger Birkhead, Matt Williams, and Dave Koons.

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Presentation transcript:

Life-history of a population of Cottonmouths in east-central Alabama Scott Boback, Matt Greene, Roger Birkhead, Matt Williams, and Dave Koons

How do organisms respond to environmental variation?

Comparative life-history can help us understand how organisms respond to variation in the environment.

A. p. piscivorus A. p. leucostoma A. p. conanti

Methodology

Results Four years of sampling every two weeks 391 captures of 198 individuals 49% adults

SVL (cm) Number of Snakes Males Females Body Size

Body Mass (g) Number of Snakes Males Females Body Size

Mean Male SVL (cm) ARNCVA AL AR SC 67.9 Body Size

SSD Index Equal ARNCVA ARSCALFL Sexual Size Dimorphism

Sex Ratio (F:M) March – June 15 June 16 – October 1:1 Sex Ratio Sex Ratio

Cormack-Jolly-Seber estimator for open populations Survival = probability that a snake alive in week i survived and did not permanently emigrate from study area in week i+1 Recapture = probability that a marked snake alive in week i did not permanently emigrate and was captured in week i+1 Survival Analysis- MARK

Recapture Probabilities SVL (cm) Weekly Recapture Probability Annual survival = 0.79 Recapture probability higher in first year Strong effect of transient individuals

Litter size = 4.1±1.5 (N=11) RCM = 26.2±9.3 (N=7) Frequency of pregnancy from 91% - 15% Reproduction

Mean Litter Size TXNCVAFLARSCALFLTXVA 4.1 Litter Size

Midpoint SVL (cm) Growth Rate (cm/month) Growth – Field Data Males Females

Midpoint SVL (cm) Growth Rate (cm/month) Growth – Lab Data Males Females

Midpoint SVL (cm) Growth Rate (cm/month) Growth – Field versus Lab Field Lab

J F M A M J J A S O N DA S O N D SVL (cm) J F M A M J J A S O N D Polyphasic Growth

Summary High annual survival Likely a long-lived species Frequency of reproduction highly variable Small litter size Slow growth but capable of extremely rapid growth when resources are abundant

Acknowledgements