Environmental drivers and reproductive consequences of variation in the diet of a marine predator

Ocean conditions can greatly impact lower trophic level prey assemblages in marine ecosystems, with effects of ocean state propagating to higher trophic levels. In many regions throughout their range, common murre (Uria aalge) exhibit narrow dietary breadth in feeding chicks and therefore are vulnerable to recruitment failures of dominant prey species during the breeding season. Contrastingly, common murres nesting in the northern California Current off Oregon, exhibit high species diversity and variability in dominant prey consumed.

Trends and variability in demographic indicators of a recovering population of green sea turtles Chelonia mydas

Multiple populations of green sea turtles Chelonia mydas show signs of population recovery. In Hawaii (USA), green turtles have increased 5.4% yr−1 since 1973, but fluctuations in census counts of nesting females make recovery diagnosis difficult. This work contributes to a growing set of studies evaluating sea turtle demography for temporal variability and is the first for Hawaiian green turtles. Our study demonstrates that some easily monitored demographic variables may serve as indicators of population change.

Legal aspects of ecosystem-based management (EBM): Implementation in Oregon coastal management

The strength of ecosystem-based management is that, if fully implemented, the approach has the potential to protect large marine ecosystems. Its weakness is that creating the perfect statute that includes all elements is nearly impossible due to differing politics, opinions, and perspectives. The next steps in this research are analyzing certain types of current projects, including ocean acidification and liquid naturalized gas, happening along the Oregon coast and determining if and how ecosystem-based management can be implemented.

Exploring participant motivations and expectations in a researcher-stakeholder engagement process: Willamette Water 2100

Many barriers impede managers and policy makers from incorporating the “best available science” into decision making and problem solving. Researcher-stakeholder engagement in research is one way to help overcome such cultural, institutional, and practical barriers. In the Willamette Water 2100 project (WW2100), scientists and stakeholders studied biophysical and socioeconomic drivers of future water scarcity in the Willamette Basin to identify ways to anticipate and respond to it.

The KP theory and Mach reflection

Interactions of two line solitons in the two-dimensional shallow-water field are studied based on the Kadomtsev-Petviashvili (KP) theory. With the use of the normal form, the extended KP equation with higher-order correction is derived. This extended KP theory improves significantly the predictability of the original KP theory for soliton interactions with finite oblique angles. The previously existing discrepancy between the experiments and the theory in the Mach reflection problem is now resolved by the normal form theory.

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