BIOL 111 Lecture Notes - Lecture 14: Dytiscidae, Hydrostatic Skeleton, Dytiscus

• School: McGill University
• Department: Biology (Sci)
• Course: BIOL 111
• Professor: Irene Gregory- Eaves

Document Summary

Biology lecture 14: arthropods i- skeletons, molting and muscles. Arthropods are the most diverse eukaryotic group. Dytiscus: predaceous diving beetle, adults collect air under wings and use this to breathe underwater. Honey bee (apis) has the most complex social life e. g. worker bees dance to communicate location of new food source. Angle of waggle relative to sun communicates position of food source. Duration of waggle communicates distance of food source. This work was awarded a nobel prize. However new data shows that up to 93% of the time other bees ignore the dance. Early experiments were conducted with artificial feeders and few food sources. Other cues such as odor are likely important. Very abundant (1018 individuals alive at any one time) Covers all external surfaces, digestive tract, and tracheae. Physical protection from abrasion, predation, parasite entry from desiccation. Location of pigments (camouflage, warning coloration, mating) Opportunity to change morphology between larval and adult stages.