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Scales of larval settlement in marine fishes and invertebrates Elizabeth Madin, Jenn Caselle and Robin Pelc 26 May 2005
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Outline Objectives Progress to date Data Planned work Points for discussion
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Outline Objectives Progress to date Data Planned work Points for discussion
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Objectives 1.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
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Outline Objectives Progress to date Data Planned work Points for discussion
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Progress to date Objective 1: Gather life history data to inform F3 model parameterization
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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.)
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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
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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
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Progress to date Objective 2: Use existing data to determine scales of decorrelation in larval settlement
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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
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Outline Objectives Progress to date Data Planned work Points for discussion
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Data 1.PISCO SMURF settlement data 2.Other settlement datasets
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Measuring fish recruitment: SMURFs
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Kelp Bass Yellowtail/Olive Rockfish Copper Rockfish Data: PISCO Kelp Rockfish Gopher/Black & Yellow RF
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Sampling design -2004
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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 Data: PISCO
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Data 1.PISCO SMURF settlement data 2.Other settlement datasets
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Data: Caffey (1985) Location: Australia (NSW) Species: barnacles (Tesseropora rosea)
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Data: Caffey (1985)
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Data: Ebert et al. (1994) D: Gaviota E: Ellwood Pier F: Stearn’s Wharf G: Dana Point H: SIO I: Ocean Beach Location: California Species: urchins (Strongylocentrotus franciscanus and S. purpuratus)
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Data: Ebert et al. (1994) S. purpuratus settlement
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Data: Ebert et al. (1994) S. franciscanus settlement
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Data: Robertson (unpub’d) Location: Panama (San Blas Archipelago) Species: Ocean surgeon (Acanthurus bahianus)
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Outline Objectives Progress to date Data Planned work Points for discussion
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Planned work Incorporate new data: -Latest (2004) PISCO data -Other datasets (if possible) (Gaylord; VanTresca; Roberston)
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Planned work New analyses: -More robust (de-)correlation analyses -Apply spatial statistical techniques (e.g., semivariograms/covariograms, kriging(?))
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Planned work: Spatial stats
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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)
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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
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Outline Objectives Progress to date Data Planned work Points for discussion
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-Calculation of ‘non-linear’ PISCO pairwise site distances: - weighting by current/flow data? - other methods? -Suggestions of other useful analyses?
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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
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Scales of larval settlement in marine fishes and invertebrates Elizabeth Madin, Jenn Caselle and Robin Pelc 26 May, 2005
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