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Articles 1 - 4 of 4
Full-Text Articles in Life Sciences
Ecological And Physiological Controls Of Species Composition In Green Macroalgal Blooms, Kathryn L. Van Alstyne Dr., Timothy A. Nelson, Karalon Haberlin, Amorah V. Nelson, Heather Ribarich, Ruth Hotchkiss, Lee Buckingham, Dejah J. Simunds, Kerri Fredrickson
Ecological And Physiological Controls Of Species Composition In Green Macroalgal Blooms, Kathryn L. Van Alstyne Dr., Timothy A. Nelson, Karalon Haberlin, Amorah V. Nelson, Heather Ribarich, Ruth Hotchkiss, Lee Buckingham, Dejah J. Simunds, Kerri Fredrickson
Shannon Point Marine Center Faculty Publications
Green macroalgal blooms have substantially altered marine community structure and function, specifically by smothering seagrasses and other primary producers that are critical to commercial fisheries and by creating anoxic conditions in enclosed embayments. Bottom-up factors are viewed as the primary drivers of these blooms, but increasing attention has been paid to biotic controls of species composition. In Washington State, USA, blooms are often dominated by Ulva spp. intertidally and Ulvaria obscura subtidally. Factors that could cause this spatial difference were examined, including competition, grazer preferences, salinity, photoacclimation, nutrient requirements, and responses to nutrient enrichment. Ova specimens grew faster than …
The Distribution Of Dmsp In Green Macroalgae From Northern New Zealand, Eastern Australia And Southern Tasmania, Kathryn L. Van Alstyne Dr.
The Distribution Of Dmsp In Green Macroalgae From Northern New Zealand, Eastern Australia And Southern Tasmania, Kathryn L. Van Alstyne Dr.
Shannon Point Marine Center Faculty Publications
The sulphonium compound diinethylsulphoniopropionate (DMSP) is commonly found in temperate green macroalgae. To examine taxonomic and regional and local geographical patterns of DMSP production in Australasian algae, I collected 30 species of green algae from 14 sites in three regions, eastern Australia, Tasmania, Australia, and the North Island of New Zealand. The distribution of DMSP content was similar to that seen from other areas of the world. DMSP was found in high concentrations in Ulva and Codium spp. It tended to be undetectable or in lower concentrations in other members of the orders Bryopsidales and Cladophorales. There was …
Growth And Grazing Of Microzooplankton In Response To The Harmful Alga Heterosigma Akashiwo In Prey Mixtures, Sylvia Lynne Graham
Growth And Grazing Of Microzooplankton In Response To The Harmful Alga Heterosigma Akashiwo In Prey Mixtures, Sylvia Lynne Graham
WWU Graduate School Collection
Heterosigma akashiwo is one of the most ichthyotoxic species of phytoplankton, severely impacting marine ecosystems and economies worldwide. Microzooplankton may play a role in regulating blooms of this alga. This study tested the effects of H. akashiwo, when part of a mixed-prey assemblage, on the growth and feeding of microzooplankton. A saturating prey concentration of 200 μg C l-1 was determined for three ciliate species: Favella sp., Strombidinopsis acuminatum, and Metacylis sp. This was used as the total prey concentration for dual-prey experiments in which the three ciliate species were exposed to reciprocal concentrations of H. akashiwo and a beneficial …
Movements And Home Ranges Of Harbor Seals (Phoca Vitulina) In The Inland Waters Of The Pacific Northwest, Sarah E. Hardee
Movements And Home Ranges Of Harbor Seals (Phoca Vitulina) In The Inland Waters Of The Pacific Northwest, Sarah E. Hardee
WWU Graduate School Collection
Marine resources are under increasing human pressure and conservation managers are using tools such as marine reserves to increase target fish stocks. However, marine predators may respond to the resultant changes in fish abundance. Harbor seals, Phoca vitulina, are abundant marine predators in the inland waters of the Pacific Northwest with the potential to influence the recovery of depressed fish stocks, yet relatively little is known about their movement patterns and home range sizes in the region. To describe harbor seal behavior, I deployed satellite and time-depth recorder tags during April and May 2007 on 20 individuals at three haul-out …