Relationships Between Habitat Preferences, Feeding, Life Cycles of Aquatic Insects & Stream Health Relationships Between Habitat Preferences, Feeding, Life Cycles of Aquatic Insects & Stream Health Dr. Robert Bohanan University of Wisconsin - Madison Center for Biology Education [email protected]
35
Embed
Relationships Between Habitat Preferences, Feeding, Life Cycles of Aquatic Insects & Stream Health Dr. Robert Bohanan University of Wisconsin - Madison.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Relationships Between Habitat Preferences, Feeding, Life Cycles of Aquatic Insects & Stream
Health Relationships Between Habitat Preferences, Feeding, Life Cycles of Aquatic Insects & Stream
Health
Dr. Robert BohananUniversity of Wisconsin - Madison
Homage to Santa Rosalia orWhy are there so many different kinds of animals?
G. E. Hutchinson, 1959
“… Vast numbers of Corixidae were living in the water. At first I was rather disappointed because every specimen of the two species present was a female, and so lacking in most critical diagnostic features, while both sexes of the second slightly smaller species were present in about equal number. … The larger C. punctata was clearly at the end of its breeding season, the smaller C. affinis was probably just beginning to breed. This is the sort of observation than any naturalist can and does make all the time. It was not until I asked myself why the larger species should breed first, and then the more general question as to why there should be 2 and not 20 or 200 species of the genus in the pond, that ideas suitable to present to you began to emerge. These ideas prompted the very general question as to why there are such an enormous number of animal species.”
Aquatic Insects Inhabit Virtually Every Possible Freshwater Habitat
• What are some of the factors that might explain why insects have been so successful in freshwater?– Evolutionary history– Morphology– Physiology– Behavior– Development
What living and non-living factors could influence the successful development of an organism from
an egg to a sexually reproducing adult in a stream?
How might habitat selection affect the life history of an aquatic insect?
• Substrate for attachment and or shelter• Food availability (quality and quantity)• Range of current• Water temperature and Oxygen• Presence and relative abundance of other organisms• Others?
• Often Bivoltine• Mostly Univoltine• Likely Univoltine• Univoltine, some Semivoltine• Univoltine• Univoltine, some Bivoltine/Multi• Univoltine• Bivoltine, some Univoltine
Trichoptera
Living Free
Filter Feeding Using Nets
How do caddisflies share what may be limited resources?