Top Posters
Since Sunday
g
1
New Topic  
colleen colleen
wrote...
Valued Member
Posts: 17076
13 years ago
We included spatial refuges, predator satiation, and size in our discussions of the role played by refuges in the persistence of exploited species. How could time act as a refuge? Explain how natural selection could lead to the evolution of temporal “refuges.”

Joseph Culp and Gary Scrimgeour (1993) studied the timing of feeding by mayfly larvae in streams with and without fish. These mayflies feed by grazing on the exposed surfaces of
stones, where they are vulnerable to predation by fish, which in the streams studied are size-selective feeders and feed predominantly during the day. In the study streams without fish, both small and large mayflies have a slight tendency to feed during the day but feed at all hours of the day and night. In the streams with abundant fish populations, small mayflies fed around the clock, while large mayflies fed mainly at night. Explain these patterns in terms of time as a refuge and size-selective predation.
Read 1946 times
1 Reply
Sunshine ☀ ☼
Replies
Answer accepted by topic starter
bio_manbio_man
wrote...
Educator
Top Poster
Posts: 33390
13 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1538 People Browsing
Show Emoticons
:):(;):P:D:|:O:?:nerd:8o:glasses::-):-(:-*O:-D>:-D:o):idea::important::help::error::warning::favorite:
Related Images
  
 290
  
 316
  
 912
Your Opinion
Who's your favorite biologist?
Votes: 722