1 / 13

Ephemeroptera: Mayflies

Ephemeroptera: Mayflies. In North America 17 families 680 species (569 in US) PA species. Hemimetabolous. Egg. Larva /nymph/naiad. Adult. Larvae. http://www.cals.ncsu.edu/course/ent425/compendium/mayfly.html. More Larvae. Life History.

quynn-norman
Télécharger la présentation

Ephemeroptera: Mayflies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Ephemeroptera: Mayflies

  2. In North America • 17 families • 680 species (569 in US) • PA species

  3. Hemimetabolous Egg Larva/nymph/naiad Adult

  4. Larvae http://www.cals.ncsu.edu/course/ent425/compendium/mayfly.html

  5. More Larvae

  6. Life History • Usually one generation/yr, some have two; others may take 2 years/generation (tend to be larger species) • Eggs always laid in water; hatch in 1 week to several months; diapause may last up to 11 months • Larval stage lasts 3-6 mos (range 10 days-2 yrs); molt many times (more than any other aquatic insect: 12-27 times; 45x in some species); may vary even within species • Emergence: • Float to surface, use exuvium as raft; better be quick! • Crawl to edge (~5cm) to emerge

  7. Life History continued • Have unique subimago life stage: the only flying insect that is not fully developed, i.e., sexually mature • Wings are dull and semitransparent due to fine hairs • Subimagos of same species and habitat usually synchronize emergence…why? • Subimago lasts ~ 24 hrs (range: minutes to 2 days) • Adult is imago-has shiny wings

  8. Subimago (aka dun)

  9. Adult or Imago (aka spinner)

  10. Reproduction • Adult lives 24 hrs (range: 90 minutes to 2 days); don’t feed-have no mouth parts and degenerate digestive systems • Males-only swarm over water; have distinctive swarming behavior • Lay eggs and die; some explode!

  11. Significance & Ecological Role • Mass emergences may be annoying (Put-in-Bay snowplows; Port Clinton brownout) • Most are sensitive to pollution, hence are clean water indicators • Feed mostly on algae, plant material, detritus • Are the mice and rabbits of the aquatic ecosystem: convert much of the plant matter into animal flesh • An essential link in the food chain

  12. Adults

  13. Trout must be really dumb

More Related