Types of Relationships
This type of relationship benefits both organisms.
What is mutualism?
Sunlight, soil, and water are examples of these factors.
What are abiotic factors?
When sea otters are removed, sea urchin numbers grow and kelp decreases. This is called…
What is a trophic cascade?
A fungus rides on beetle wings but does not harm them.
What is commensalism?
Removing snakes from a grassland might cause rodent numbers to ____________?
What is increase?
A remora fish attaches to a shark and eats leftover scraps without harming it.
What is commensalism?
This factor would be MOST responsible if a pond dried up.
What is an abiotic factor? The Sun
Removing a predator usually causes an __________ in prey numbers.
What is increase?
A cactus depends on a moth for pollination at night. If the moth disappears…
The cactus population will decrease
If algae disappear from a pond, what happens to fish population that eat them?
They will decrease.
A fungus infecting an insect and reducing its lifespan is this relationship.
What is parasitism?
Wolves hunting elk in Yellowstone is an example of this kind of factor.
What is a biotic factor?
Overfishing large fish in a coral reef can cause algae to grow out of control. Why?
Because smaller herbivores are not eaten and can’t keep algae balanced.
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If berry bushes die off in winter, how might bears be affected?
Bears may lose a food source and decline in number.
Two bird species fighting for nesting sites in the same trees.
What is competition?
A volcanic eruption covering an island with ash is which factor?
What is an abiotic factor?
In a desert canyon, removing hawks would cause rodent populations to __________
What is increase?
Brine shrimp in a salt flat die when rain dilutes the saltwater. Which factor caused this?
What is an abiotic factor?
Introducing goldfish into a mountain lake ecosystem where they eat algae and shrimp will have what affect on the rare birds that also eat shrimp?
The birds will decline because shrimp numbers drop.
A glowworm uses light to lure insects into sticky traps.
What is predation?
If a non-airborne disease kills half of a frog population, that’s which kind of factor?
What is a biotic factor?
Adding a non-native insect predator that eats crop pests could cause what unintended effect?
What is a trophic cascade that reduces other species populations unexpectedly?
A parasitic worm relies on both snails and frogs. If frogs disappear, what happens to the worm?
The worm population will decrease.
A parasite reduces fertility in a cave fish species. How might this affect the food web?
It could reduce fish numbers, changing predator and prey balances.