Time filter

Source Type

Pacific Grove, CA, United States

Bresnahan P.J.,University of California at San Diego | Wirth T.,University of California at San Diego | Martz T.R.,University of California at San Diego | Andersson A.J.,University of California at San Diego | And 6 more authors.
Methods in Oceanography | Year: 2016

A novel chemical sensor package named "WavepHOx" was developed in order to facilitate measurement of surface ocean pH, dissolved oxygen, and temperature from mobile platforms. The system comprises a Honeywell Durafet pH sensor, Aanderaa optode oxygen sensor, and chloride ion selective electrode, packaged into a hydrodynamic, lightweight housing. The WavepHOx has been deployed on a stand-up paddleboard and a Liquid Robotics Wave Glider in multiple near-shore settings in the Southern California Bight. Integration of the WavepHOx into these mobile platforms has enabled high spatiotemporal resolution pH and dissolved oxygen data collection. It is a particularly valuable tool for mapping shallow, fragile, or densely vegetated ecosystems which cannot be easily accessed by other platforms. Results from three surveys in San Diego, California, are reported. We show pH and dissolved oxygen variability >0.3 and >50% saturation, respectively, over tens to hundreds of meters to highlight the degree of natural spatial variability in these vegetated ecosystems. When deployed during an extensive discrete sampling program, the WavepHOx pH had a root mean squared error of 0.028 relative to pH calculated from fifty six measurements of total alkalinity and dissolved inorganic carbon, confirming its capacity for accurate, high spatiotemporal resolution data collection. © 2016 Elsevier B.V..

Agency: NSF | Branch: Standard Grant | Program: | Phase: | Award Amount: 25.00K | Year: 2011

For the past decade, Ocean Discovery Institute has been empowering diverse youth from an urban district to protect our oceans and natural environment, improve the health of our communities and strengthen our quality of life. Ocean Discovery Institute is the only non-profit in the San Diego region using the ocean as an educational tool to capitalize on young peoples instinctive attraction to the sea and build knowledge of our planets defining feature. Ocean Discovery Institute leads a series of initiatives that incorporate education, scientific research and environmental stewardship. Currently these initiatives reach over 4,500 low-income students and community members each year. All of Ocean Discovery Institutes programming is provided tuition-free.

Agency: NSF | Branch: Standard Grant | Program: | Phase: AISL | Award Amount: 249.99K | Year: 2013

This Pathways project from the Ocean Discovery Institute (ODI) seeks to develop and pilot a program model designed to fill an identified gap in citizen science research and practice literature: how to effectively engage and better understand how to foster participation among people from under-represented groups in citizen science research. The ODI model is designed around six principles: (1) leaders who are reflective of the community, (2) science that is locally relevant, (3) guided, as opposed to self-guided, experiences, (4) direct interactions with scientists, (5) progressively increasing responsibilities for participants who express interest, and (6) removing barriers to participation, such as transportation, language, family involvement and access to technology.

The project addresses environmentally degraded, crime-ridden local canyons, a locally relevant STEM-related issue, and leverages the Southern California Coastal Water Research Projects (SCCWRP) regional citizen science effort focused on identifying the sources and pathways of trash through regional watersheds. The scientific research components of the project focus on four canyons in the area, employing sampling methods developed by SCCWRP. Youth who are part of other ODI programs and who have demonstrated leadership and interest in science, work with the project team to scaffold family and youth participation in project activities taking place during afterschool and weekend time. Based on continued participation in the project, community participants can become more involved in the project, starting as new scientists and moving through returning scientists to expert scientists roles. The project evaluation seeks to identify the role and importance of the components of the proposed model with respect to participation, retention, and learning by participants from groups under-represented in STEM. The dissemination products of this Pathways project include a white paper describing the model and lessons learned as well as presentations to community groups and education and citizen science practitioners.

Based on insights from the iterative approach to the model during this Pathways study, a subsequent full-scale development project would seek to engage citizen science projects around the nation in adapting the model to increase participation of individuals from groups underrepresented in STEM, including building out ODIs citizen science programming.

Wang J.H.,University of Hawaii at Manoa | Fisler S.,Ocean Discovery Institute | Swimmer Y.,National Oceanic and Atmospheric Administration
Marine Ecology Progress Series | Year: 2010

Visual cues play important roles in sea turtle foraging behavior and likely influence their interactions with fishing gear. Altering these cues may be a useful strategy to reduce the incidental catch of sea turtles in various fisheries. We examined the potential effectiveness of 3 visual cues-shark shapes placed along the length of the gill net, illumination of nets by LED lights, and nets illuminated with chemical lightsticks-in reducing bycatch of green sea turtles Chelonia mydas in gill nets. We then adapted these potential deterrents into commercial bottom gill net fishery to quantify their effects on target fish catch rates and the catch value. Our results indicate that the presence of shark shapes significantly reduced the mean catch rates of green turtles by 54% but also reduced target catch by 45% and, correspondingly, catch value by 47%. In contrast, nets illuminated by LED lights significantly reduced mean sea turtle catch rates by 40% while having negligible impacts on target catch and catch value. Similarly, nets illuminated by chemical lightsticks also significantly reduced mean sea turtle catch rates by 60% while having no significant impact on target catch and catch value. These results illustrate the potential for modifying fishing gear with visual deterrents to effectively reduce sea turtle catch rates. © Inter-Research 2010 · www.int-res.com.

Wang J.,University of Hawaii at Manoa | Barkan J.,Ocean Discovery Institute | Fisler S.,Ocean Discovery Institute | Godinez-Reyes C.,Comision Nacional de A reas Naturales Protegidas | Swimmer Y.,National Oceanic and Atmospheric Administration
Biology Letters | Year: 2013

Fisheries bycatch of marine animals has been linked to population declines of multiple species, including many sea turtles. Altering the visual cues associated with fishing gear may reduce sea turtle bycatch. We examined the effectiveness of illuminating gillnets with ultraviolet (UV) light-emitting diodes for reducing green sea turtle (Chelonia mydas) interactions. We found that the mean sea turtle capture rate was reduced by 39.7% in UV-illuminated nets compared with nets without illumination. In collaboration with commercial fishermen, we tested UV net illumination in a bottom-set gillnet fishery in Baja California, Mexico. We did not find any difference in overall target fish catch rate or market value between net types. These findings suggest that UV net illumination may have applications in coastal and pelagic gillnet fisheries to reduce sea turtle bycatch. © 2013 The Author(s) Published by the Royal Society. All rights reserved.

Discover hidden collaborations