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SMS100 Exam 2
Umaine SMS100 with Townsend study guide for Exam 2
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Undergraduate 2
11/17/2015

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Term
Photosynthesis
Definition
Most important form of primary production
Term
Chemosynthesis
Definition
Lesser form of primary production
Term
Primary production
Definition
rate of organic matter formation, mostly dissolved organic carbon.
Term
Biomass
Definition
Standing stock of organic matter
Term
Autotrophs
Definition
photosynthesizers, chemosynthesizers
Term
Heterotrophs
Definition
consumers
Term
Chlorophyll
Definition
photosynthetic pigment
Term
Reaction of life running right
Definition
photosynthesis
Term
Reaction of life running left
Definition
respiration
Term
Is photosynthesis the same as growth?
Definition
no
Term
What are the major macronutrients?
Definition
Nitrogen/nitrate, Phosphorus/phosphate, Silicon/silicate.
Term
Give an example of a micronutrient
Definition
Iron, or other trace metals that organisms need.
Term
Where are nutrients generally more concentrated and why?
Definition
At great depth, they are depleted at the surface having been taken up by phytoplankton.
Term
What are the limiting factors in reference to primary production?
Definition
Light and nutrients.
Term
What is N-Fixation?
Definition
Conversion of inert N2 into NH4+ or another useable form.
Term
Spring bloom dynamics
Definition
Rapid growth of phytoplankton, visible in satellite images, occurs when daylight and thermocline become just right, cells are suspended near the surface.
Term
Critical depth
Definition
Depth to which cells can be vertically mixed in the water column but still get enough light for photosynthesis to exceed respiration.
Term
How much biomass is lost at each trophic step and how?
Definition
80-90% is lost as heat and metabolic wastes.
Term
Chlorophyll fluorescence
Definition
Chlorophyll molecule absorbs blue light and re-emits red light (lower energy). Precise way to measure low concentrations of chlorophyll.
Term
Benthic
Definition
Sea floor
Term
Pelagic
Definition
water column
Term
Osmotic stress
Definition
pressure on organisms when salinity differs within and outside their bodies.
Term
What does the binomial system refer to?
Definition
Genus and species.
Term
Phytoplankton
Definition
Archaea and bacteria, prokaryotes.
Term
Cyanobacteria
Definition
Phytoplankton, blue green bacteria.
Term
Prochlorophytes
Definition
smallest and most abundant phytoplankton
Term
Green algae
Definition
Eukaryotic phytoplankton
Mostly freshwater
Term
Silicoflagellates
Definition
Eukaryotic phytoplankton
Rare
important in sediments
Term
Coccolithophores
Definition
Eukaryotic phytoplankton
Important to CO2 system and sediments
Term
Diatoms
Definition
EP
Larger cells, very important in food webs.
Glass shell, tend to sink, formations to prevent sinking.
Asexual or sexual reproduction.
Term
Dionflagellates
Definition
EP
2 flagella, swim vertically
Harmful algal blooms and red tides
Mixotrophy - photosynthesis and phagotrophy
Term
Picophytoplankton/ultraphytoplankton
Definition
.3-2 micrometers, some are bacteria. Most abundant, most primary production.
Term
Macroalgae
Definition
Greens, reds, browns (see weeds, rockweeds, kelps)
Term
Sea grasses
Definition
Eel grass.
Wasting disease in 1930s, provide important habitat.
Term
Meroplankton
Definition
part-time plankton. planktonic larvae, nauplius/cyprid
Term
Holoplankton
Definition
Full time plankton
Term
Microzooplankton
Definition
Small ciliates, important in the microbial loop.
Term
Copepods
Definition
Most abundant animal on the planet, "grazers", 6 naupliar and 5 copepoded stages.Diapause, filter feed, vertical migration
Term
Amphipods, mysids, euphausids
Definition
Krill
Term
Pteropods
Definition
planktonic molluscs
Term
Gelatinous zooplankton
Definition
Arrow worms, ctenophores, salps, jelly fishes, etc.
Term
Ichthyoplankton
Definition
fish eggs and larvae
Term
Cambrian explosion
Definition
Most invertebrates first appeared, 570-542 mya. First multicellular organisms, increased O2 levels.
Term
Biodiversity
Definition
Number and abundance of species
Term
Species diversity
Definition
number of species
Term
Species richness
Definition
abundance of species
Term
Infaunal
Definition
living in sediments
Term
Epifaunal
Definition
living on sediments.
Term
Sponges
Definition
Don't move, primitive animal w/ glass skeleton
Term
Sea anemones
Definition
Nematocysts, sit and wait predator.
Term
Stony corals
Definition
Calcium carbonate skeletal support, Zooanthellae (photosynthetic symbiont)
Term
Lophophorates
Definition
Cup like thing (cluster of ciliated tentacles) used to capture planktonic food particles.
Term
Flatworms
Definition
under rocks at low tide
Term
Ribbon worms
Definition
Mud flats
Term
Round worm/nematodes
Definition
Everywhere, most evolutionarily successful animal.
Term
Polychaetes
Definition
Segmented, proboscis, swim crawl and burrow.
Term
Benthic molluscs
Definition
Bivalves, gastropods
Term
Echinoderms
Definition
star fish, sea cucumbers, sand dollars, sea urchins.
Term
Pycnogonids
Definition
sea spiders and horseshoe crabs
Term
Crustaceans
Definition
isopods, amphipods, decapods (crabs etc)
Term
Cephalopods/nectonic invertebrates
Definition
Squid, nautilus, octopus
Term
Agnathans
Definition
Jawless fishes, lampreys and hagfish
Term
Cartilagenous fishes
Definition
Condrichthyes, elasmobranchs and chimaeras.
Term
Sharks
Definition
Fast swimmers, ampullae of lorenzini detect electric fields, lateral line. Must swim
Term
Rays and skates
Definition
flattened, big pectoral fins/wings.
Term
Bony fishes
Definition
96% of 30000 species
Term
Lobe finned
Definition
Coelecanth, lungfish
Term
Ray finned
Definition
Modern fishes, operculum, bone skeleton, breathe by gulping.
Term
Lunate caudal fin
Definition
Tuna, fastest
Term
Shoaling
Definition
Social
Term
Schooling
Definition
Tactical
Term
Pods
Definition
Contracted schools under attack
Term
Planktivores
Definition
Gill rakers
Term
High vs low fecundity
Definition
elasmobranchs vs. bony fish
Term
Mortality/survival in early life stages
Definition
The average fish is dead
Term
The bathysphere
Definition
sphere to let people go deep in the ocean
Term
Otoliths
Definition
stone in ear used to age fish
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