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Modeling solitary bee abundance E rica Stevani, Silvia Lom á scolo and Jimena Dorado

Modeling solitary bee abundance E rica Stevani, Silvia Lom á scolo and Jimena Dorado. Study area: Villavicencio Reserve Mendoza. Solitary bee Megachile sp. Photo Nachu Chacoff. Nest traps. Larrea divaricata. Photo Beni Padron. Objective:

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Modeling solitary bee abundance E rica Stevani, Silvia Lom á scolo and Jimena Dorado

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  1. Modeling solitary bee abundanceErica Stevani, Silvia Lomáscolo and Jimena Dorado

  2. Study area: Villavicencio Reserve Mendoza

  3. Solitary bee Megachile sp. Photo Nachu Chacoff

  4. Nest traps Larrea divaricata Photo Beni Padron

  5. Objective: • Modeling solitary bee abundance along the floral season in four sites in Villavicencio. • Questions: • 1-Does the pattern of bee abundance differ among the sites ? • In what parameters? • 2-If they differ, is the difference correlated to habitat degradation?

  6. Our data Deterministic portion: Gaussian y= A*exp(-(x-b)^2/(2*(c^2)) Stochastic portion: Poisson distribution mle2(ocupacion~dpois(A*exp(-(dias-b)^2/(2*(c^2)))),start=list(A=7,b=35,c=14),data=ocup.fecha06)

  7. Our data Deterministic portion: Gaussian y= A*exp(-(x-b)^2/(2*(c^2)) Stochastic portion: Poisson distribution A c b

  8. Question 1: • Does the pattern of bee abundance differ among the sites ? • In what parameters? A, b, c, different for all sites A is similar, b and c are different A is different, b and c are similar A, b, c, similar for all sites

  9. Bee abundance differs among sites Log-likelihood = -44.87 Log-likelihood = -34.90 Likelihood Ratio Test: Chi-sq = 19.94, df = 9, p = 0.019

  10. Question 1: • Does the pattern of bee abundance differ among the sites ? YES • In what parameters? A, b, c, different for all sites A is similar, b and c are different A is different, b and c are similar A, b, c, similar for all sites

  11. Questions: • 1-Does the pattern of bee abundance differ among the sites ? YES • In what parameters? In A ANOVA: Chi-sq = 7.21 df = 3 p = 0.066 ANOVA: Chi-sq = 8.28 df = 6 p = 0.218 A, b, c, different for all sites A is similar, b and c are different A is different, b and c are similar A, b, c, similar for all sites

  12. Objective: • Modeling solitary bee abundance along the floral season in four sites in Villavicencio. • Questions: • 1-Does the pattern of bee abundance differ among the sites ? YES • In what parameters? In A • 2-If they differ, is the difference correlated to habitat degradation?

  13. Question 2: • Is the difference among sites related to habitat degradation? A is different b and c similar for pristine and degraded sites A, b, c, different for all sites A is similar, b and c are different A is different, b and c are similar A, b, c, similar for all sites

  14. Disturbed and pristine sites have different pattern of bee ocupation Log-likelihood = -39.59 Log-likelihood = -39.04 Likelihood Ratio Test: Chi-sq = 1.11, df = 2, p = 0.575

  15. Question 2: • Is the difference among sites related to habitat degradation? A is different b and c similar for pristine and degraded sites A, b, c, different for all sites A is similar, b and c are different A is different, b and c are similar A, b, c, similar for all sites

  16. Objective: • Modeling solitary bee abundance along the floral season in four sites in Villavicencio. • Questions: • 1-Does the pattern of bee abundance differ among the sites ? YES • In what parameters? In A • 2-If they differ, is the difference correlated to habitat degradation? IT SEEMS TO BE

  17. General conclusions • The nesting pattern varies mainly in number of traps occupied, not so much in the timing. • The degraded sites have greater abundance of bee nests. • We don’t know why abundance is greater, really…

  18. Thanks!!

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