Marine Primary Producers
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1 Marine Primary Producers OCN 201 Biology Lecture Photo: Fuhrman Lab; University of Southern California Primary production The production of organic compounds from atmospheric or aquatic carbon dioxide, principally through the process of photosynthesis (or chemosynthesis) Amount of carbon fixed per unit area (or volume) per unit time Units: g C m -2 yr -1 Carried out by autotrophs
2 Primary production On land primary producers are mostly macroscopic In the sea nearly all primary production is due to microscopic phytoplankton Terrestrial Biomes
3 Primary Producers Dugong feeding on seagrass Photo: Mark Goodchild Kelp Forests Can grow at up to 18 inches/day create canopy, habitat structure
4 Kelp Forests Can grow at up to 18 inches/day create canopy, habitat structure Macroalgae & Seagrasses limited to coastal areas
5 Macroalgae & Seagrasses Exception: Sargassum limited to coastal areas a planktonic macroalga Photosynthetic bacteria Diatom Photosynthetic picoeukaryotes Dinoflagellate Most Life in the Sea is Microscopic!
6 Photosynthetic bacteria Photosynthetic picoeukaryotes Most Life in the Sea is Microscopic! Prokaryotic Phytoplankton (Cyanobacteria) Most abundant in the ocean: Prochlorococcus Synechococcus (there are others) Responsible for most of the primary productivity in the open ocean...and about half of the oxygen on the planet!
7 Eukaryotic Phytoplankton Picoeukaryotes (0.2-2 µm) Diatoms ( µm) Dinoflagellates ( µm) Coccolithophores (3-50 µm) Picoeukaryotes Ostreococcus - smallest free-living eukaryote 0.8 µm François Yves Bouget in Le Journal du CNRS Wenche Eikrem and Jahn Throndsen, University of Oslo
8 nucleus Picoeukaryotes Micromonas pusilla chloroplast mitochondrion Diatom Coccolithophore Silica frustule Calcium carbonate plates cyanobacterium Cellulose thecal plates picoeukaryote Dinoflagellates
9 Dinoflagellates Harmful algal blooms: Impacts filter feeding shellfish accumulate algal toxins by feeding on toxic phytoplankton, sometimes at levels potentially lethal to humans or other consumers fish, shellfish, and bird kills, occasionally invertebrate and marine mammal kills toxins or other compounds can kill marine fauna directly, or result in low oxygen conditions as the bloom biomass decays
10 Relevant to Hawaii? 11 William Walsh/DAR/DLNR roi William Walsh/DAR/DLNR kole Top 10 fish species involved in reported cases of ciguatera fish poisoning in Hawaii during the 5-year period between September 1999 and Benthic dinoflagellate: Gambierdiscus toxicus papio uku palani RANKING FISH (Hawaiian name OUTBREAKS ILLNESSES and common name) % and (n) % and (n) No. 1 roi 18.5% (23) 22.5% (56) (peacock grouper) No. 2 kole 15.3% (19) 15.7% (39) (gold ring surgeonfish) No. 3 ulua 9.6% (12) 7.6% (19) (large jacks mixed spp) No. 4 papio 7.3% (9) 7.2% (18) (small jacks mixed spp) No. 5 seabass 5.6% (7) 8.0% (20) (spp uncertain) No. 6 palani 5.6% (7) 8.0% (20) (eyestripe surgeonfish) No. 7 uku 5.6% (7) 4.8% (12) (green jobfish) No. 8 weke 5.6% (7) 4.8% (12) (goatfish) No. 9 wahanui 4.0% (5) 2.8% (7) (smalltoothed jobfish) No. 10 uhu 1.6% (2) 1.2% (3) (parrotfish) TOTAL All fish implicated in 100% (124) 100% (249) reported cases of ciguatera poisoning. DIATOMS Fragilaria Navicula
11 Chaetocerous Fragilaria DIATOMS Navicula Coscinodiscus Siliceous Sediments
12 Coccolithophores Emiliania huxleyi Coccolithophores
13 Summary Kelp and sea grasses important in nearshore in nutrient rich areas BUT most primary producers are microscopic Photosynthetic bacteria (cyanobacteria) are most abundant primary producers on the planet The larger photosynthetic planktonic eukaryotes are also very abundant Some important groups: diatoms & coccolithophores have hard shells that create massive (and inspirational) mineral deposits Questions?
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