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Scales of larval settlement in marine fishes and invertebrates

Scales of larval settlement in marine fishes and invertebrates. Elizabeth Madin, Jenn Caselle and Robin Pelc 26 May 2005. Outline. Objectives Progress to date Data Planned work Points for discussion. Outline. Objectives Progress to date Data Planned work Points for discussion.

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Scales of larval settlement in marine fishes and invertebrates

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  1. Scales of larval settlement in marine fishes and invertebrates Elizabeth Madin, Jenn Caselle and Robin Pelc 26 May 2005

  2. Outline Objectives Progress to date Data Planned work Points for discussion

  3. Outline Objectives Progress to date Data Planned work Points for discussion

  4. Objectives • Gather life history data to inform F3 model parameterization: a) fishes b) invertebrates 2. Use existing data to determine scales of decorrelation in larval settlement: a) spatial b) temporal

  5. Outline Objectives Progress to date Data Planned work Points for discussion

  6. Progress to date Objective 1: Gather life history data to inform F3 model parameterization

  7. Progress to date Focal species: • Kelp bass (Paralabrax clathratus) • Kelp rockfish (Sebates atrovirens) • Cabezon (Scorpaenichthys marmoratus) • Urchins (S. purpuratus; S. franciscanus) • Abalone (Haliotis rufescens) • Lobster (Panulirus spp.)

  8. Progress to date:data gathered • Larval PLD • Spawning season • Spawning character • Fecundity (# larvae/female) • Spawning cues/habitats • Precompetency period • Competency period • Larval dispersal locations • Natural mortality rate of adults (m) • Form(s) of density-dependence • Data sources

  9. Progress to date:data gathered • Habitat • Duration of releases • Realized dispersal distance • Spatial scale of releases these data don’t seem to exist for most species relevant to F3

  10. Progress to date Objective 2: Use existing data to determine scales of decorrelation in larval settlement

  11. Progress to date • Initial (de-)correlation analyses explored • Some data quality and analytical issues need resolution • Currently revising these analyses to allow for more reliable, robust conclusions

  12. Outline Objectives Progress to date Data Planned work Points for discussion

  13. Data • PISCO SMURF settlement data 2. Other settlement datasets

  14. Measuring fish recruitment: SMURFs

  15. Copper Rockfish Kelp Rockfish Kelp Bass Gopher/Black & Yellow RF Yellowtail/Olive Rockfish Data: PISCO

  16. Sampling design -2004

  17. Data: PISCO Raw data: (small subset) PISCO SMURF (ongoing) - Location: California - Species: Pacific fishes; some inverts mean settlers per SMURF - per site - per sampling period - per species/ spp. group

  18. Data: PISCO

  19. Data • PISCO SMURF settlement data 2. Other settlement datasets

  20. Data: Caffey (1985) Location: Australia (NSW) Species: barnacles (Tesseropora rosea)

  21. Data: Caffey (1985)

  22. Data: Ebert et al. (1994) Location: California Species: urchins (Strongylocentrotus franciscanus and S. purpuratus) D: Gaviota E: Ellwood Pier F: Stearn’s Wharf G: Dana Point H: SIO I: Ocean Beach

  23. Data: Ebert et al. (1994) S. purpuratus settlement

  24. Data: Ebert et al. (1994) S. franciscanus settlement

  25. Data: Robertson (unpub’d) Location: Panama (San Blas Archipelago) Species: Ocean surgeon (Acanthurus bahianus)

  26. Outline Objectives Progress to date Data Planned work Points for discussion

  27. Planned work Incorporate new data: • Latest (2004) PISCO data • Other datasets (if possible) (Gaylord; VanTresca; Roberston)

  28. Planned work New analyses: • More robust (de-)correlation analyses • Apply spatial statistical techniques (e.g., semivariograms/covariograms, kriging(?))

  29. Planned work: Spatial stats

  30. Planned work Further data exploration: • analogous analyses for SST data • partitioning PISCO dataset by year (i.e., to filter out interannual variation) • prewhitening (i.e., to filter out large scale climatic variation) • examine potential larval/oceanographic interactions (spatial; temporal)

  31. Planned work Comparison with results of related studies: • Myers et al. (1997) settlement decorrelation (fishes); global • Field and Ralston (in review) settlement decorrelation (fishes); west coast • Broitman et al. (in press) recruitment variability (intertidal inverts); SCI

  32. Outline Objectives Progress to date Data Planned work Points for discussion

  33. Points for discussion • Calculation of ‘non-linear’ PISCO pairwise site distances: - weighting by current/flow data? - other methods? • Suggestions of other useful analyses?

  34. Conclusion • PLD and other life history characteristics may influence the scales of spatial and temporal decorrelation in larval settlement • Spatial decorrelation plots may inform the probability distribution (kernel) of larval dispersal in specific regions

  35. Scales of larval settlement in marine fishes and invertebrates Elizabeth Madin, Jenn Caselle and Robin Pelc 26 May, 2005

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