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BIOL 1070 midterm 1 review .
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BIOL*1070 Midterm 1 Review: Cannot swim or crawl Released by mussel, gets into fish gills
Nested Hierarchy: (host), evolutionary characteristic
Groups of related organisms share suites of Attach to host
similar characteristics and the number of shared
traits increases with relatedness. Unionid Strategy #1: Bait
Conglutinates:
The higher order category must be suitable for The membrane in which the Glochidia are
the lower order sublevels. enclosed.
Method of infecting fish host
Ex. Ecosystem refers to both physical The conglutinate membrane resembles fish
environment and population of organisms. prey (lure), trick the fish.
Ex. 1 Ex. 2 On a line attached to the mussel.
Glochidia released from conglutinate
membrane when fish approaches.
Unionid Strategy #2: Host Capture
Mussel grips host and pumps Glochidia in
Simple Lure:
Modified mantle tissue catch fish attention
Complex Lure:
Mantle tissue mimics fish (host) prey
Evolution: Advantages and Disadvantages of Lure
Complexity?
What Is it? Advantages Disadvantages
genetic change Enables attraction of Mussels utilize more
change in the allele frequencies of a needed host fish for energy to develop
population reproduction complex lures
not necessarily good or bad (obligate parasitism) (conglutinates) to
more complex the attract needed host
Why Study it? more specialized the fish.
To manage exploitation host fish
*we eat the big fish out of the population, Developmental Perspective:
that’s artificial/human selection Different lure complexity, not necessarily “less
To understand mutating bacteria (antibiotic evolved”, just not trying to attract the same host
resistance) fish, or can reproduce with a larger variety of
host fish, …requires less complexity.
Unionid Larvae Mussels: Ecological Perspective:
Greater lure complexity dictates type of host
Life Cycle: fish, mimicry of host fish’s prey to trick
1. Fertilization pump Glochidia reproductive success
2. Larva (Glochidia) (obligate parasitism phase). As complexity
3. Fish Host evolved, the more reproductively successful
4. Juvenile mussels survived and passed their genes. (small
5. Adult mutations over time).
Veliger Larvae Mussels:
Glochidia Larvae: Ex. Zebra Mussels
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