Now showing items 21-23 of 23
Spring Diet of River Otters, Lontra Canadensis, in the San Juan Islands of Washington State
(Friday Harbor Laboratories, 2014-06)
Lontra canadensis, the river otter, is a predator in marine nearshore ecosystems in North America. Because it is a top carnivore, L. canadensis, may be exerting a trophic cascade. Its diet can vary regionally and possibly seasonally. This study examines the diet of L. canadensis through feces analysis from two sites on San ...
Capture Efficiency of Various Species and Sizes of Drift Macrophytes by Red Urchins, Strongylocentrotus franciscanus
(Friday Harbor Laboratories, 2013-06)
In the San Juan Islands, drift macrophytes from shallow waters represent a significant spatial subsidy provided to the subtidal zone. This organic matter is a potential food source for deep dwelling herbivores like the red urchin Strongylocentrotus franciscanus. Little is known about how urchins capture and use drift material. ...
Response of Haptera Growth to Different Frequencies of Light in Deep Water Agarum fimbriatum and Shallow Water Alaria marginata
(Friday Harbor Laboratories, 2014-06-30)
Light plays an important role in kelp ecology as an energy source and as an important kelp growth regulator. It induces a negative phototropic response in kelp haptera. Because longer wavelengths of light are available at shallower depths in additions to shorter wavelengths, it was hypothesized that kelp species generally ...