Path Analysis This presentation contains paths using functional groups described in following slide The rest of the slides contained in the presentation.

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Presentation transcript:

Path Analysis This presentation contains paths using functional groups described in following slide The rest of the slides contained in the presentation outline the following paths Kelp forest community using complete dataset for PISCO where samples are repeated through time for sites 2) Same as above with strongest indirect path highlighted 3) Kelp forest community after temporal autocorrelation among sites was removed by subtracting abundance data from previous year for PISCO sites 4) Same as a above with strongest indirect path highlighted

Functional Groups AUTOTROPHS INVERTEBRATES FISHES Fleshy algae/ Understory kelp (Eisenia arborea, Laminaria setchellii, Pterygophora californica) Giant kelp (Macrocystis pyrifera) INVERTEBRATES Herbivorous invertebrates Algae grazers: Strongylocentrotus franciscanus, Strongylocentrotus purpuratus (potentially incorporating lag time t-1) Other herbivores: (Haliotis rufescens, Lithopoma gibberosum, Megathura crenulata,) Omnivorous/scavenger invertebrates (Asterina miniata, Parastichopus parvimensis) Sessile planktivorous invertebrates (Crassedoma giganteum, Tethya aurantia, Urticina lofotensis, Urticina piscivora, Astrangiala jollaensis, Balanophyllia elegans, Corynactis californica, Diopatra/Chaetopterus ornata/spp., Phragmatopoma californica, Stylaster californicus) Predator invertebrates (Kelletia kelletii, Pisaster giganteus, Pisaster ochraceous, Pycnopodia helianthoides) FISHES Planktivorous fish (Chromis punctipinnis, Sebastes mystinus, Semicossyphus pulcher) Mobile small-invertebrate-eating fish (Damalichthys vacca, Embiotoca jacksoni, Embiotoca lateralis, Oxyjulisc alifornica) Invertebrate-eating fish/piscivores (Sebastes atrovirens, Sebastes serranoides, Sebastes flavidus, Semicossyphus pulcher) Fishbase piscivorous fish* (Sebastes carnatus, Sebastes melanops, Sebastes chrysomelas, Sebastes rastrelliger, Sebastes caurinus) Sebastes species not included: Sebastes miniatus, Sebastes paucispinis, Sebastes serriceps Based on conversations with Ben, Fio, Bernardo we decided to separate herbivorous inverts into two functional groups. Algae grazers are urchin species. Other herbivores are species that may feed on detached algae or algal detritus but are primarily associated with algae as a habitat classification. These are not directly affecting fleshy algae * From Fish Base

Temporal autocorrelation removed -.01 .06 .03 -.16 .24 .30 .13 .15 .06 .23 .43 .94 .28 -.13 .16 .33 .22 .16 .04 .10 -.25

Strongest indirect effect: predatory inverts  pisc fish = 0.10 Temporal autocorrelation removed -.01 .06 .03 -.16 .24 .30 .13 .15 .06 .23 .43 .94 .28 -.13 .16 .33 .22 .16 .04 .10 -.25 Strongest indirect effect: predatory inverts  pisc fish = 0.10

Temporal autocorrelation NOT removed -.21 -.03 -.02 .09 -.41 .26 .18 .54 .06 -.19 -.34 .20 -.05 -.09 .43 .20 .16 -.20 .02 .37 .37

Strongest indirect effect: kelp  fish_invert_pisc = 0.13 Temporal autocorrelation NOT removed -.21 -.03 -.02 .09 -.41 .26 .18 .54 .06 -.19 -.34 .20 -.05 -.09 .43 .20 .16 -.20 .02 .37 .37 Strongest indirect effect: kelp  fish_invert_pisc = 0.13