University of Washington
Comparative biomechanics lab home
Comparative biomechanics lab
Comparative biomechanics lab Adam Summers Biomechanics Research comparative biomechanics peer reviewed papers Adam Summers writing for popular press comparative biomechanics in the news
Comparative biomechanics lab home
NavLab1 NavPpl1 NavResrch1 NavPub1 NavPopSci1 NavNews1
University of Washinton Home




Friday Harbor Laboratories
Integrated Center for Marine Biomaterials and Ecomechanics

Home

Research

Cartilage

Hard Prey

Big Fish

Fast Fish

Breathing

Burrowing

Egg Capsules

Shark Fishing

Financial Support

Egg Capsules

Tom Koob and I are intersted in the amazing biomechanical, biochemical, and evolutionary aspects of the chondrichthian egg capsule. Egg-laying, or oviparity has evolved at least 4 times in the cartilaginous fishes, and an embryo may spend as long as three years in the capsule before hatching.

The capsular material is relatively impermeable to oxygen, so the embryo requires a flow of oxygenated water through the capsule as it develops. item2Small slits open up in the sides of the capsule to allow flow. In the case of skates and chimaeroids the embryo actively pumps water through the capsule by undulating its tail. In sharks the capsule water is passively pumped through the capsule by currents around it.

We are investigating the tradeoffs between active and passive flow, the metabolic costs of pumping, the evolution of the capsule shape, and the hydrodynamics of the egg capsule.

Adam Summers studies the biomechanics of egg capsules
item1a
Loading