Final: Lentic fish communities- Lake Mendota case study Flashcards
Lake Mendota
Anthropogenic habitat change
Functional roles of fishes in ecosystems
Manipulation of fish assemblages
Unintended consequences of management
eutrophication
-nonpoint nutrient pollution
-most common impairment of surface waters in US excess inputs of phosphorus and nitrogen
phosphorus
polyps produce
nitrogen
polyps produce
nonpoint pollution
- inputs are the major
source of water pollution in U.S
-difficult to control –> biomanipulation
biomanipulation
Nonpoint sources difficult to
control
-top-down
increases habitat restoration
intensive stocking
harvest regulations
rooted aquatic plants
top-down vs bottom-up
Top-down: low water clarity –> planktivores abundant
northern pike
-adhesive egg
spawns on flooded vegitation
- sessile larve
adhesive eggs
-adheres on contact to substrate material or other eggs
piscivores
carnivorous animal that eats fish
-primary fish
EX: pickerel
sessile larvae
stays in one place
planktivores
-eat plankton and small organisms
EX: perch, cisco
zooplanktivory
acts of eating zooplankton
size-efficiency hypothesis
-Brooks and dodson (1965)
-plaktivores eat zooplankton so now more less effective grazers = more algea = affect algae biomass and clarity
zooplankters
-Grazers of algae
-bigger ones outcompete small
