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Trophic cascades in the western Ross Sea, Antarctica: revisited

Creator:: Ainley, David G., Ballard, Grant, Jones, Randolph M., Jongsomjit, Dennis, Pierce, Stephen D., Smith, Walker O., Jr., and Veloz, Sam
Abstract:: We investigated mesopredator effects on prey availability in the Ross Sea, Antarctica, assessing the reasons why Adélie penguin Pygoscelis adeliae foraging trip duration (FTD) increases and diet changes from krill to fish as numbers of foraging penguins and competing cetaceans increase in the penguins’ foraging area. To investigate penguins’ seasonally...
Resource Type:: Article
Full Text:: of Ross Island; G. Ballard & D. Ainley pers. obs.). As above, we included a random effect for

Factors driving Adélie penguin chick size, mass and condition at colonies of different sizes in the Southern Ross Sea

Creator:: Whitehead, Amy L., Lyver, Phil O'B., Ballard, Grant, Barton, Kerry, Karl, Brian J., Dugger, Katie M., Jennings, Scott, Lescroël, Amelie, Wilson, Peter R., and Ainley, David G.
Abstract:: Body size, mass and condition can affect an organism’s ability to cope with variation in resource availability or metabolic demand, particularly as juveniles reach independence. It follows that changes to parental provisioning efficiency (size and frequency of meals) through intraspecific competition or environmental conditions that affect prey availability may affect...
Resource Type:: Article
Full Text:: Adélie penguin chick size, mass and condition at colonies of different sizes in the Southern Ross Sea

Modelling diatom and Phaeocystis blooms and nutrient cycles in the Southern Bight of the North Sea: the MIRO model

Creator:: Lancelot, C., Spitz, Y., Gypens, N., Ruddick, K., Becquevort, S., Rousseau, V., Lacroix, G., and Billen, G.
Abstract:: The link between anthropogenic nutrient loads and the magnitude and extent of diatom and Phaeocystis colony blooms in the Southern Bight of the North Sea was explored with the complex ecosystem model MIRO. The model was adapted for resolving the changing nutrient loads, the complex biology of the bloom species...
Resource Type:: Article
Full Text:: . Gypens1, K. Ruddick3, S. Becquevort1, V. Rousseau1, G. Lacroix3, G. Billen4 1Université Libre de

Errors in juvenile copepod growth rate estimates are widespread: problems with the Moult Rate method

Creator:: Hirst, A. G., Peterson, William T., and Rothery, P.
Abstract:: The Moult Rate (MR) method has been used widely to derive stage-specific growth rates in juvenile copepods. It is the most common field-based method. Unfortunately, the equation underlying the method is wrong and, consequently, large errors in juvenile growth rate estimates are widespread. The equation derives growth from the mean...
Resource Type:: Article
Full Text:: rate estimates are widespread: problems with the Moult Rate method A. G. Hirst1,*, W. T. Peterson2

Light-induced growth of phytoplankton collected during the winter from the benthic boundary layer off Oregon, USA

Creator:: Wetz, Michael S., Wheeler, Patricia A., and Letelier, Ricardo M.
Abstract:: Despite the importance of the spring phytoplankton bloom off Oregon as a food source for zooplankton, little is known about the sources of phytoplankton seed stock for the bloom or its timing. Experiments were conducted in the late winter to determine if the benthic boundary layer (BBL) could be a...
Resource Type:: Article
Full Text:: 10 12 14 b 0 2 4 6 8 10 12 14 0 1 2 3 4 5 6 7 8 9 10 c a C hl or op hy ll a (µ g

Larval development of Euphausia pacifica in the laboratory: variability in developmental pathways

Creator:: Feinberg, Leah R., Shaw, C. Tracy, and Peterson, William T.
Abstract:: Gravid adult female Euphausia pacifica were collected off Newport, Oregon, USA and transferred to the laboratory, where females spawned eggs, eggs hatched, and larvae were reared at 10.5 degrees C. We fed 4 cohorts of larvae to excess with a combination of phytoplankton species and monitored them daily until they...
Resource Type:: Article
Full Text:: Puget Sound (Ross et al. 1982), May through June in the North Pacific (Ponomareva 1966) and February

Variability in brood size and female length of Euphausia pacifica among three populations in the North Pacific

Creator:: Gomez-Gutierrez, Jaime, Feinberg, Leah R., Shaw, Tracy, and Peterson, William T.
Abstract:: We compared brood sizes among adult female Euphausia pacifica Hansen, 1911 from 3 populations in the North Pacific: Puget Sound, Washington, USA; Toyama Bay, Japan; and the Oregon coast, USA. Additionally, we used multiple linear regression models to compare the interspecific brood size as a function of female length and...
Resource Type:: Article
Full Text:: of Euphausia pacifica (reviewed by Ross & Quetin 2000). In higher latitudes (49 to 51° N) of the

Late spring and summer patterns of euphausiid reproduction in Southeast Alaska fjord waters

Creator:: Szabo, Andrew R. and Batchelder, Harold P.
Abstract:: Abundance, size and development stage data for furcilia and juvenile euphausiids and data on timing and prevalence of attached spermatophores on adult females are used to infer spawning times by four euphausiid species in Frederick Sound and lower Stephens Passage, Southeast Alaska. Results from net tows conducted between late May...
Resource Type:: Article
Full Text:: 10.5°C 271 (Feinberg et al. 2006) to 68 days at 8°C (Ross 1981). At these rates, juveniles observed

Response of bacteria to simulated upwelling phytoplankton blooms

Creator:: Wetz, Michael S. and Wheeler, Patricia A.
Abstract:: Until recently, studies of the fate of primary production in coastal upwelling systems have focused mainly on export through sinking of particulate organic matter (POM). In week-long deck incubations conducted during the upwelling season off Oregon, a large accumulation of carbonrich (C:N ≥ 16) dissolved organic matter (DOM) occurred following...
Resource Type:: Article
Full Text:: : 257–270 Gordon LI, Jennings JC Jr, Ross AA, Krest JM (1995) A sug- gested protocol for continuous

Potential effects of sea-level rise on plant productivity: species-specific responses in northeast Pacific tidal marshes

Creator:: Janousek, Christopher
Abstract:: Coastal wetland plants are adapted to varying degrees of inundation. However, functional relationships between inundation and productivity are poorly characterized for most species. Determining species-specific tolerances to inundation is necessary to evaluate sea-level rise (SLR) effects on future marsh plant community composition, quantify organic matter inputs to marsh accretion, and...
Resource Type:: Article
Full Text:: time of planting. Total dry mass values (mean ± SD) were 0.79 ± 0.27, 2.30 ± 1.20, and 0.29 ± 0.13 g

ScholarsArchive@OSU

Trophic cascades in the western Ross Sea, Antarctica: revisited

Factors driving Adélie penguin chick size, mass and condition at colonies of different sizes in the Southern Ross Sea

Modelling diatom and Phaeocystis blooms and nutrient cycles in the Southern Bight of the North Sea: the MIRO model

Errors in juvenile copepod growth rate estimates are widespread: problems with the Moult Rate method

Light-induced growth of phytoplankton collected during the winter from the benthic boundary layer off Oregon, USA

Larval development of Euphausia pacifica in the laboratory: variability in developmental pathways

Variability in brood size and female length of Euphausia pacifica among three populations in the North Pacific

Late spring and summer patterns of euphausiid reproduction in Southeast Alaska fjord waters

Response of bacteria to simulated upwelling phytoplankton blooms

Potential effects of sea-level rise on plant productivity: species-specific responses in northeast Pacific tidal marshes

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