<div><p>Sampling was conducted along the Pacific Continental Shelf of Oregon and Washington (44.34 N to 46.99 N, depth 42 to 88 meters) during the following cruises (dates are provided in YYYY-MM-DD format):<br />
COP2021 (2021-10-19) on R/V Pacific Storm,<br />
COP2022A (2022-04-07) on R/V Pacific Storm,<br />
COP2022B (2022-07-07 to 2022-07-10) on R/V Pacific Storm,<br />
COP2022C, cruise IDs SP2215 and RS2215 (2022-07-22 to 2022-07-23) on R/V Gordon Sproul,<br />
COP2022D, cruise ID SP2219 (2022-09-13 to 2022-09-19) on R/V Gordon Sproul,<br />
COP2022E (2022-09-21 to 2022-09-22) on R/V Pacific Storm.</p>
<p>At each box core station, samples were collected with a modified Grey-O'Hara 0.1 square meter (m²) box core. One box core sample was taken at each station. Depth was recorded from the vessel's echosounder at the time the box corer hit the bottom. Only samples with a penetration depth of at least 4 centimeters (cm) were accepted for processing. Approximately 80 milliliters (mL) of sediment were collected from the undisturbed surface layer for later grain size analysis. Any organisms noticed in the sediment subsample at the time of collection were removed and placed in the organism sample jar. Surface sediment samples were then stored in the ship's refrigerator. The remainder of the collected core was sieved onboard through a 1.0 millimeter (mm) mesh screen, and all organisms except the target shrimp <em>Neotrypaea</em> (both infauna living in the sediment and small epifauna which may have been on the surface, hereafter collectively called "macrofauna") as well as debris retained on the screen were preserved in 70% EtOH. <em>Neotrypaea</em> in good condition were placed in a cooler with collected sediment and battery-operated bubblers to keep for experiments at the Hatfield Marine Science Center. <em>Neotrypaea</em> deemed not suitable for experimental work were preserved in 95% EtOH and placed in the freezer.</p>
<p>At approximately every third station, vertical water-column profiles of conductivity, temperature, dissolved oxygen, pH, and fluorescence were obtained with a Sea-Bird Electronics CTD (conductivity, temperature, depth) unit equipped with additional sensors. At approximately every third station on COP2022B, a camera lander with two downward-facing video cameras was dropped and left on the seafloor for one minute and then retrieved. Those videos will be later analyzed for the presence of burrows holes attributable to the <em>Neotrypaea</em> and to be used to check for false negatives (places where the shrimp are present but not collected in the box core).</p>
<p>At each camera lander station, a camera lander with two downward-facing video cameras and a set of lights for each camera was dropped and left on the seafloor for one minute and then retrieved. The field of view of each camera is ~0.4 m². Burrows holes attributable to <em>Neotrypaea</em> were quantified on each video. In addition to quantification, these were used to check for false negatives (places where the shrimp are present but not collected in the box core).</p>
<p>The EC lander deployments yield high-resolution time-series measurements of near-bed velocities and dissolved oxygen from which benthic fluxes of oxygen have been derived for each 15-minute sampling interval.</p>
<p>The BBL lander is a platform that supports a Nortek Aquadopp velocity profiler and a triggered sampling device that collects water samples at discrete heights (1 to 100 cm ) above the seabed. In cases where the near-bed gradients can be resolved, these data may be modeled to yield benthic fluxes.</p>
<p>The slow corer refers to a coring device that takes sediment cores (10.5 cm diameter) that typically have intact sediment water-interfaces and sediment column lengths of 50-60 cm. After collection, these are immediately moved to the cold van. These cores are utilized for core incubations made at sea to yield ex-situ benthic fluxes, and these cores are sectioned for post-cruise analyses of porosity, bulk density, grain size, total C and N, and inorganic C.</p></div>
Sample Stations for COP Cruises 2021-2022
Sample Stations for COP Cruises 2021-2022
<div><p><strong>BCO-DMO Processing:</strong><br />
- renamed fields to comply with BCO-DMO naming conventions;<br />
- replaced blanks with "No" in the VideoDive column (to distinguish from "no data");<br />
- added date-time field in ISO8601 format;<br />
- converted PDT dates to format YYYY-MM-DD;<br />
- replaced blanks with "nd" (no data).</p></div>
880760
Sample Stations for COP Cruises 2021-2022
2022-09-21T13:49:02-04:00
2022-09-21T13:49:02-04:00
2023-12-14T12:07:44-05:00
urn:bcodmo:dataset:880760
Sample stations for the Neotrypaea COP (Community, Oxygen, & Productivity) Effects ground-truth cruises in 2021 and 2022
Benthic invertebrate communities, that the highly productive US West Coast fishery species and marine mammals rely on for food, are being increasingly impacted by low oxygen conditions. This project addresses the potential ecological consequences of a new member to these benthic communities, the ghost shrimp Neotrypaea. In estuaries, Neotrypaea continuously rework the sediment via their burrowing activities. Their high abundances and geological effects make them important in mitigating impacts of nutrient run-off (natural and human-induced), which can exacerbate low oxygen conditions. Neotrypaea are also considered threats to the oyster industry because of their sediment-excavating activities. An expansion of their distribution beyond estuaries may have additional consequences for the Dungeness crab fishery (regionally valued at $33-74M/y) as Neotrypaea sp. are both competitors with juveniles and prey for larger Dungeness crab. This project will ground-truth predictions of Neotrypaea’s new offshore distribution with video and sample collections. Using box core samples we will document differences in potentially interacting benthic communities within the Neotrypaea beds as compared to areas not colonized by the shrimp. These new data are needed to determine whether the existing species composition is altered by the recruitment of Neotrypaea. We will estimate the shrimp’s contribution to benthic oxygen and nutrient fluxes by using aquatic eddy covariance (EC) methods and core incubations in shelf areas with and without abundant shrimp. This dataset includes the sampling locations for the model ground-truthing/community changes (box core collections) and the EC lander deployment and slow core collections. Coastal waters along the OR-WA shelf are subject to growing human related management, extractive, cultural, and recreational activities. This research is particularly needed for commercial fisheries stakeholders in decisions regarding ocean-use planning and be valuable to oyster growers concerned over burrowing shrimp pest management.
false
Henkel, S. K. (2022) Sample stations for the Neotrypaea COP (Community, Oxygen, & Productivity) Effects ground-truth cruises. Biological and Chemical Oceanography Data Management Office (BCO-DMO). (Version 1) Version Date 2022-09-22 [if applicable, indicate subset used]. doi:10.26008/1912/bco-dmo.880760.1 [access date]
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10.26008/1912/bco-dmo.880760.1
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benthic invertebrates
benthic flux
habitat suitability modeling
2023-12-14
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