Relative predation intensity within temperate seagrass habitat during June 2015 (Habitat_Fragmentation project) (NCEI Accession 0278373)
This dataset contains biological and survey - biological data collected at Back_Sound_NC during deployment Fodrie_HabitatFragmentation from 2015-06-10 to 2015-06-24. These data include common_name. The instruments used to collect these data include Trawl_custom. These data were collected by Dr F. Joel Fodrie of University of North Carolina - Morehead City as part of the "Collaborative Research: Habitat fragmentation effects on fish diversity at landscape scales: experimental tests of multiple mechanisms (Habitat Fragmentation)" project. The Biological and Chemical Oceanography Data Management Office (BCO-DMO) submitted these data to NCEI on 2019-03-01.
The following is the text of the dataset description provided by BCO-DMO:
Relative predation intensity within temperate seagrass habitat.
Dataset Description:
Our investigation of seagrass edge effects on mesopredators and larger predators took place in Back Sound, North Carolina (34 degrees 40 minutes North, 76 degrees 34 minutes West). Predation-driven mortality (loss rates of tethered individuals) of blue crabs and pinfish were monitored within a 5,600 m2 seagrass meadow at Jack's Island along the southern rim of Back Sound. These predation measurements were collected during June-July, 2015, in connection with the global-scale Zostera Experimental Network study.
The following is the text of the dataset description provided by BCO-DMO:
Relative predation intensity within temperate seagrass habitat.
Dataset Description:
Our investigation of seagrass edge effects on mesopredators and larger predators took place in Back Sound, North Carolina (34 degrees 40 minutes North, 76 degrees 34 minutes West). Predation-driven mortality (loss rates of tethered individuals) of blue crabs and pinfish were monitored within a 5,600 m2 seagrass meadow at Jack's Island along the southern rim of Back Sound. These predation measurements were collected during June-July, 2015, in connection with the global-scale Zostera Experimental Network study.
Dataset Citation
- Cite as: Fodrie, F. Joel (2023). Relative predation intensity within temperate seagrass habitat during June 2015 (Habitat_Fragmentation project) (NCEI Accession 0278373). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0278373. Accessed [date].
Dataset Identifiers
ISO 19115-2 Metadata
gov.noaa.nodc:0278373
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Ordering Instructions | Contact NCEI for other distribution options and instructions. |
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NOAA National Centers for Environmental Information +1-301-713-3277 NCEI.Info@noaa.gov |
Dataset Point of Contact |
NOAA National Centers for Environmental Information ncei.info@noaa.gov |
Time Period | 2015-06-10 to 2015-06-24 |
Spatial Bounding Box Coordinates |
West: -76.56667
East: -76.56667
South: 34.66667
North: 34.66667
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Data Presentation Form | Digital table - digital representation of facts or figures systematically displayed, especially in columns |
Dataset Progress Status | Complete - production of the data has been completed Historical archive - data has been stored in an offline storage facility |
Data Update Frequency | As needed |
Supplemental Information | Acquisition Description: We utilized tethering trials as a proxy of predator-driven mortality of blue crabs and pinfish within edge and interior regions of the seagrass meadow at Jack’s Island. Our design consisted of 21 "edge" (0-1 m from seagrass-sandflat boundary) and 21 "interior"(>3 m from seagrass-sandflat boundary) plots, with each plot defined by two 1x1-m subplots separated from each other by 0.5 m (but with the entirety of each plot being at the suitable distance for edge/interior designations). Each of the 42 total plots were separated from one another by >2 m. For both the edge and interior treatments, seagrass shoot density was reduced by 50% in a third of the plots, seagrass shoot density was reduced by 80% in another third of the plots, and seagrass shoot density was left at ambient in the final third of plots (all randomly assigned). This resulted in a 2x3 experimental design in which meadow location and shoot density were fully crossed. Reduction of shoot densities was achieved by deploying a 1x1-m quadrant with a 10x10 grid (with each grid cell = 0.01 m2). We then removed all seagrass in 50 or 80 of the cells for the 50% and 80% reduction treatments, respectively. The resultant shoot densities were as follows: ambient treatments had a mean of 575 shoots m-2, 50% reduction treatments had a mean of 283 shoots m-2, and 80% reduction treatments had a mean of 124 shoots m-2. We deployed 126 tethered blue crabs (5.2 ± 0.1 cm carapace width) and 168 tethered pinfish (5.1 ± 0.1 cm total length) in plots over three and four trials, respectively. We ran one less trial with blue crabs due to the availability of specimens within our preferred size range during our experimental window. All crabs and pinfish were collected via small trawl on the day before deployment. During each trial, a tethered blue crab was randomly assigned to one of the subplots within each plot, while a tethered pinfish was placed in the remaining subplot (i.e., 42 juvenile blue crabs and 42 pinfish were deployed in a trial). Each tethering device consisted of a lawn staple as an anchor placed in the center of a subplot, connected to a 30-cm long section of 3.6-kg clear monofilament fishing line. For blue crabs, the free end of the monofilament was glued to the center of the crab’s carapace after making a lasso around the crab’s body. Blue crabs had each of their claws glued shut using Loctite super glue gel to prevent them from cutting the tether. Pinfish were tethered through the soft tissue immediately behind their lower jaw bone by piercing this tissue, threading the line through the piercing, and the tying an overhand knot in the line. As a method check, we individually tethered >40 blue crabs and >20 pinfish in laboratory tanks outfitted with artificial seagrass. Over a 4-day period, none of the tethered animals became free, tethered pinfish did not behave noticeably different that untethered pinfish also in the tank, and tethered animals did not become entangled in artificial seagrass blades. Tethered blue crabs and pinfish were deployed in our field experiment ~3 hours before daytime high tides. Following deployment, each tethered animal was checked after 1 hour, 2 hours, 3 hours, and 24 hours to assess loss rates (presumably via predation). Individual blue crabs or pinfish missing at the 1-, 2-, 3-, and 24-hour checks were randomly assigned a survival time ranging between 0-1, 1-2, 2-3, and 3-24 hours, respectively, to acknowledge that we could not be sure within check intervals when predation occurred. Furthermore, this approach insured that we did not artificially reduce variances among replicates. Any animal remaining on its tether after 24 hours was assigned a survival time of 24 hours, and then released. |
Purpose | This dataset is available to the public for a wide variety of uses including scientific research and analysis. |
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Last Modified: 2024-05-31T15:15:28Z
For questions about the information on this page, please email: ncei.info@noaa.gov
For questions about the information on this page, please email: ncei.info@noaa.gov