| Contributors | Affiliation | Role |
|---|---|---|
| Bruno, John | University of North Carolina at Chapel Hill (UNC-Chapel Hill) | Principal Investigator |
| Rauch, Shannon | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
Onset HOBO U22-001 Underwater Temperature Data Loggers were placed on the benthos at 8 m depth by attaching them to a stainless steel eye bolt.
Data Processing:
Hoboware Version 3.7.21 and R Studio Version 1.1.383 were used to process data.
BCO-DMO Processing:
- changed Date_Time column to ISO8601 format: YYYY-MM-DDThh:mmZ
| File |
|---|
temperature_logger.csv (Comma Separated Values (.csv), 4.28 MB) MD5:c9c494f154791270e4572624bd4504d9 Primary data file for dataset ID 838851 |
| Parameter | Description | Units |
| Measurement | Measurement ID number | unitless |
| Date_Time | Date and time (GMT); format: YYYY-MM-DDThh:mmZ | unitless |
| Temp_C | Water temperature | degrees Celsius |
| Site | Site name | unitless |
| Lat | Latitude | degrees North |
| Long | Longitude | degrees East |
| Dataset-specific Instrument Name | Onset HOBO U22-001 Underwater Temperature Data Logger |
| Generic Instrument Name | Onset HOBO Pro v2 temperature logger |
| Generic Instrument Description | The HOBO Water Temp Pro v2 temperature logger, manufactured by Onset Computer Corporation, has 12-bit resolution and a precision sensor for ±0.2°C accuracy over a wide temperature range. It is designed for extended deployment in fresh or salt water.
Operation range: -40° to 70°C (-40° to 158°F) in air; maximum sustained temperature of 50°C (122°F) in water
Accuracy: 0.2°C over 0° to 50°C (0.36°F over 32° to 122°F)
Resolution: 0.02°C at 25°C (0.04°F at 77°F)
Response time: (90%) 5 minutes in water; 12 minutes in air moving 2 m/sec (typical)
Stability (drift): 0.1°C (0.18°F) per year
Real-time clock: ± 1 minute per month 0° to 50°C (32° to 122°F)
Additional information (http://www.onsetcomp.com/)
Onset Computer Corporation
470 MacArthur Blvd
Bourne, MA 02532 |
| Website | |
| Platform | R/V Queen Mabel |
| Description | August 2018 research cruise in the Galápagos archipelago aboard the vessel Queen Mabel. |
NSF Award Abstract:
A well-known pattern in coastal marine systems is a positive association between the biomass of primary producers and the occurrence or intensity of upwelling. This is assumed to be caused by the increase in nutrient concentration associated with upwelling, enabling higher primary production and thus greater standing algal biomass. However, upwelling also causes large, rapid declines in water temperature. Because the metabolism of fish and invertebrate herbivores is temperature-dependent, cooler upwelled water could reduce consumer metabolism and grazing intensity. This could in turn lead to increased standing algal biomass. Thus upwelling could influence both bottom-up and top-down control of populations and communities of primary producers. The purpose of this study is to test the hypothesis that grazing intensity and algal biomass are, in part, regulated by temperature via the temperature-dependence of metabolic rates. Broader impacts include the training and retention of minority students through UNC's Course Based Undergraduate Research program, support of undergraduate research, teacher training, and various outreach activities.
The investigators will take advantage of the uniquely strong spatiotemporal variance in water temperature in the Galápagos Islands to compare grazing intensity and primary production across a natural temperature gradient. They will combine field monitoring, statistical modeling, grazing assays, populations-specific metabolic measurements, and in situ herbivore exclusion and nutrient addition to measure the effects of temperature on pattern and process in shallow subtidal communities. The researchers will also test the hypothesis that grazer populations at warmer sites and/or during warmer seasons are less thermally sensitive, potentially due to acclimatization or adaptation. Finally, the investigators will perform a series of mesocosm experiments to measure the effect of near-future temperatures on herbivores, algae, and herbivory. This work could change the way we view upwelling systems, particularly how primary production is regulated and the temperature-dependence of energy transfer across trophic levels.
| Funding Source | Award |
|---|---|
| NSF Division of Ocean Sciences (NSF OCE) |