Plankton Net
Fnft
Fnft: The evolutionary relationships of the major groups of marine organisms
Size Distribution
Fnft: Relative sizes of phytoplankton groups
Fnft: Food pyramid that leads to an adult herring
PHYTOPLANKTON “plant plankton” Photosynthetic The very base of the food chain…
Fnft: A micrograph of pelagic diatoms
Diatom (chain) diatom
Fnft: The size difference between a typical centric diatom and a coccolithophore cell © Steve Gschmeissner/Photo Researchers, Inc.
Fnft: SEM of Thalassiosira © Dee Breger/Photo Researchers, Inc.
Fnft: SEM of entire Asteromphalus heptacles Courtesy of Dr. José Luis Iriarte M., Universidad Austral de Chile
Fnft: Mixed sample of spinous and chain-forming diatoms, Diatoma vulgare © blickwinkel/Alamy Images
Figure 3.11: Cells in a chain of Stephanopyxis Courtesy of Kohki Itoh
Fnft: centric diatom from saltwater © Phototake/Alamy Images
Fnft: A dinoflagellate © Phototake/Alamy Images
Dinoflagellates
Ceratium A Dinoflaggelate “Phytoplankton”
Fnft: SEM of Gonyaulax polygramma
Fnft: SEM of Dinophysis rapa
Figure 3.16c: SEM of Gonyaulax © CSIRO Marine Research
Fnft: SEM of Ceratochoris horrida © CSIRO Marine Research
Why do phytoplankton matter to global change?
ZOOPLANKTON “animal plankton” NOT Photosynthetic – but “herbivores” and “carnivores” instead They FEED ON the very base of the food chain (phytoplankton)…but how?
2 types of ZOOPLANKTON HOLOPLANKTON Spend entire lives as plankton Copepod, for example MEROPLANKTON Only part of their lives as plankton crabs & many fish, for example
Copepod, holoplankton
…a “survey” of zooplankton
salp
Larvacean: (Sea Squirt) Filter Feeder
Feeding on Dispersed Prey The appendicularian Oikopleura, within its mucous bubble. Arrows indicate path of water flow.
(mollusk)
Inhabitants of the Pelagic Division Some large gelatinous zooplankton: (a) A pelagic mollusk, Corolla. © David Wrobel/Visuals Unlimited
(sea star)
Polychaete worms & some mollusks
(crustacean)
Meroplankton
Inhabitants of the Pelagic Division Some large gelatinous zooplankton: (b) A ctenophore, Bolinopsis, swimming with eight rows of ciliated combs. Courtesy of OAR/National Undersea Research Program/NOAA
They aren’t always “small!” Some large gelatinous zooplankton: (c) A colony of salps (Pegea) cloned from a single parent. © Eric Prine/age fotostock
The “ultimate” symbiosis: sea slug w/ jellyfish
Not all plankton are small
Water spider
The cycle from a larva stage to the upcoming of adult hood.
Vertical Migration: Tying the Upper Zones Together A midwater siphonophore with a small, gas- filled pneumatophore at the upper end. Courtesy of Dr. Alice Alldredge, University of California, Santa Barbara
Bad plankton
Fnft: Phytoplankton bloom along the California coast
Food Chain impacts
Table 15.01