Quiz 2 Flashcards
Services provided by marine ecosystems
Temperature moderation, nutrient cycling, habitat, commercial fishing, storm protection, water purification, medicine, CO2 absorption
Photic Zone
Area where sunlight reaches, upper 200M of ocean, most productivity occurs here
Pelagic Zone
Open water, Epipelagic Zone = where sunlight reaches, 90% of ocean life, low nutrients
Benthic Zone
Ocean floor - starfish, mollusks, sponges
Mesopelagic (Twilight) Zone
low temps, increased water pressures, species have thin bodies, bioluminescence, go to epipelagic layer at night
Bathypelagic (Midnight) Zone
No primary production, 1% of animals live here, fish have slim, weak bodies, bioluminescence, slow metabolic rates, may not have eyes
Abyssal
Unique organisms adapted to lack of light live here. Very cold, few nutrients, high pressures
Hadal
Deepest part of marine environment
Threats to Marine Ecosystems
Overfishing, Pollution, Climate Change, Habitat Loss, Invasive Species, Sedimentation
Bottom Trawling
Large nets are dragged behind trawler ships. Destroy sea floor habitats for coral, sponges, starfish, etc. As a result, smaller species have become more dominant
“Fishing down the food chain”
Apex predators like cod or tuna are overfished, leaving lower-trophic level species to overpopulate and compete with the young of more desirable species
“dead zone” or hypoxic area
Area where organisms cannot survive
Euthrophication
Nutrient pollution - fertilizers wash into water, algae flourishes too much, blocks sunlight from other plants
Food chains vs. Food webs
Sequence of organisms that feed off each other and acquire energy and organic molecules
A linked set of food chains that show the connections within a community
Approx. how much energy is passed to each Trophic level? Where does the rest go?
10%. Most energy is lost as heat.
Primary Consumers
Herbivores. Eat Primary Producers
Secondary Consumers
Eat Primary Consumers
Detritovores
Organisms that feed on dead plants and animals: Crabs, Worms, Insects
