Expedition Field Report:
"July 23, 2016"

East 61st and John Finley Walk, Upper East Side, East River

Manhattan, NY

July 23, 2016

Expedition Metadata

Metadata is information about the monitoring expedition. This includes the people who conducted the expedition, the type of structure, and the date/location information above.

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    Oyster Structure Name: "61st & John Finley Walk"
    Oyster Structure Type: Research Station
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    User: Lindsey Strehlau
    User Type: citizen scientist
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    Organization Name: Unaffiliated/None (Community Scientists)
    Organization Location: N/A, N/A, N/A
    Organization Type: Other

Expedition Data

Billion Oyster Project is working to understand the best methods and locations to restore oysters in New York Harbor. We also want to understand what benefits to the harbor, or "ecosystem services," oysters might provide. You help us conduct this research by collecting data on:

  • Measures of oyster performance (mortality, growth, and recruitment)
  • Factors that affect oyster performance (including site conditions and water quality)
  • Diversity and abundance of non-oyster species (mobile and sessile organisms)
The data in this expedition represents one piece of a larger dataset that is growing with your help! To view data from multiple expeditions, use the View Data page.

This protocol captures data on oyster mortality (how many oysters survived) and growth (how long each live oyster is, measured in millimeters).

Contributor for this protocol: Lindsey Strehlau

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    Bioaccumulation on Cage:
    Medium – Some encrusting macroalgae/animals reducing size of mesh opening up to 25%.

  • Summary Data for This Expedition

    Summary data including the # of oysters measured and the average, largest, and smallest oyster lengths.
    Number of Live Oysters Measured 74
    Average Oyster Length (the "mean") 27.55 mm
    Smallest Oyster (the "minimum" or "min") 10 mm
    Largest Oyster (the "maximum" or "max") 44 mm

    Different types of graphs can help you assess how well the oysters are growing at your site. A bar chart is one way to visualize the lengths of each oyster. During this expedition there were 74 live oysters total. This chart uses one bar to represent each live oyster's length, so there are 74 bars. The bars are sorted in order from smallest to largest.

    (You can hover over a bar to display the exact measurement. Click the icon to explore the graph in Plot.ly).

    The length, in millimeters, of each live oyster measured during this expedition, sorted from smallest to largest.

    A frequency distribution histogram is a different way to visualize the lengths of the live oysters. The frequency is how many times an observation appeared in the dataset, and the distribution is the grouping of the observations. This one splits all of the oyster measurements into even-sized groups, or "bins," by length (in 5mm increments) and tells you how many oysters are in each group. A histogram is a good way to view patterns and to condense a large dataset into a smaller, more readable graph.

    (You can hover over the graph to display the exact # of oysters in each bin. Click the icon to explore the graph in Plot.ly).

    A box plot is another way to visualize the oyster measurement dataset. This box plot shows you what the smallest (min), largest (max), average (mean), and "normal" range of oyster measurements were for this expedition.

    • The bottom and top lines represent the min and max oyster measurements. These lines show us the range of oyster measurements for this expedition.
    • The line in the middle of the box represents the mean oyster measurement.
    • The top and bottom lines of the box represent the standard deviation above and below the mean oyster measurement. (It's okay if you don't know what a standard deviation is- it's a way of showing what's considered "normal" in a dataset. )

    (You can hover over this graph to view exact numbers. Click the icon to explore the graph in Plot.ly.)

    The table below shows the length of each live oyster. This is the "raw data" that was used to make the bar chart, histogram, and box plot above.

    Table: Oyster Lengths

    Oyster Lengths
    Oyster Length (mm)
    30
    27
    19
    25
    28
    15
    21
    27
    13
    25
    26
    31
    15
    20
    20
    25
    29
    35
    32
    35
    32
    40
    26
    36
    30
    23
    30
    25
    10
    25
    32
    35
    29
    32
    26
    25
    23
    34
    41
    26
    31
    31
    44
    34
    30
    18
    31
    12
    21
    25
    20
    44
    22
    26
    32
    32
    33
    30
    36
    18
    31
    39
    31
    16
    11
    40
    29
    24
    22
    29
    27
    34
    24
    34

    Oyster Measurements Photos

    outer side substrate shell photo
    Substrate Shell #1, outer side
    inner side substrate shell photo
    Substrate Shell #1, inner side
    outer side substrate shell photo
    Substrate Shell #2, outer side
    inner side substrate shell photo
    Substrate Shell #2, inner side
    outer side substrate shell photo
    Substrate Shell #3, outer side
    inner side substrate shell photo
    Substrate Shell #3, inner side
    outer side substrate shell photo
    Substrate Shell #4, outer side
    inner side substrate shell photo
    Substrate Shell #4, inner side
    outer side substrate shell photo
    Substrate Shell #5, outer side
    inner side substrate shell photo
    Substrate Shell #5, inner side
    outer side substrate shell photo
    Substrate Shell #6, outer side
    inner side substrate shell photo
    Substrate Shell #6, inner side
    outer side substrate shell photo
    Substrate Shell #7, outer side
    inner side substrate shell photo
    Substrate Shell #7, inner side
    outer side substrate shell photo
    Substrate Shell #8, outer side
    inner side substrate shell photo
    Substrate Shell #8, inner side
    outer side substrate shell photo
    Substrate Shell #9, outer side
    inner side substrate shell photo
    Substrate Shell #9, inner side
    outer side substrate shell photo
    Substrate Shell #10, outer side
    inner side substrate shell photo
    Substrate Shell #10, inner side

    This protocol captures data on meteorological conditions, recent rainfall, and the environmental conditions of the land and water, including pollution and garbage. Site Conditions can affect oysters by impacting water quality, particularly through Combined Sewer Overflows.

    Contributor for this protocol: Lindsey Strehlau

    Meteorological Conditions

    Weather Sunny
    Air temperature 33.3 ℃
    Wind speed 5 MPH
    Wind direction northwest
    Humidity 43%

    Recent Rainfall

    Water Conditions

    Describe the water color Dark Green
    Is there an oil sheen present? true

    This protocol captures data on sessile organisms, which are creatures that don't move again after they anchor to one spot, like sponges, tunicates, and barnacles. To measure this, we place a transparent grid with 25 points over each of the ORS's tiles, and identify which species is underneath each grid point. This tells us about the potential for oyster reefs to provide a substrate for a variety of sessile species, as well as how those species might change over time ("ecological succession").

    Contributor for this protocol: Lindsey Strehlau

    Common Name Scientific Name Grid Points occupied (across all tiles) Percent of grid points occupied (across all tiles)
    None/Sediment N/A 9 / 100 9%

    Sessile Organisms Photos

    settlement tile photo
    Settlement Tile #1
    settlement tile photo
    Settlement Tile #2
    settlement tile photo
    Settlement Tile #3
    settlement tile photo
    Settlement Tile #4

    This protocol captures data on several different water quality parameters (temperature, salinity, dissolved oxygen, etc.) that might affect oyster mortality and growth.

    Contributor for this protocol: Lindsey Strehlau

    Water Quality Parameter Method Unit Average of Results
    Water Temperature digitalThermometer c 24.166666666666668
    Dissolved Oxygen colormetricvAmpules mgl 8
    Salinity refractometer ppt 25
    pH sensor pHlogscale 7.636666666666667
    Ammonia testStrips ppm 6