Josh E. Carter, Raven D. Walker, Dr. Glenn A. Jones, Ocean and Coastal Resources, Undergraduate...
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Josh E. Carter, Raven D. Walker, Dr. Glenn A. Jones, Ocean and Coastal Resources, Undergraduate History Repeats: A demand-supply price case study of the
Josh E. Carter, Raven D. Walker, Dr. Glenn A. Jones, Ocean and
Coastal Resources, Undergraduate History Repeats: A demand-supply
price case study of the 19 th century Diamond-back terrapin
population collapse Menu Analysis Menus, or bills of fare, debuted
in the US during the 1820s and became widespread by the 1850s
(Jones, 2008). Ephemeral by design, they are typically discarded
and replaced by a new menu. Those that have survived can now serve
new purpose as a source of never-before examined price data for the
items they feature. Recent character recognition software and
digitization techniques have allowed databases of primary source
collections such as newspaper archives and menus to be made usable
for scientific research. After sorting through a host of menus that
we selected menus from the 1850s to 1930s featuring entre dishes
containing diamondback terrapin; in most cases the entre dish
featured was Terrapin a la Maryland. Menus were acquired from one
online database (New York Public Library (NYPL) and two collections
(NYPL and American Antiquarian Society). The majority of the menus
found came from the Buttolph-Collection 1900-1907 housed at the
NYPL. Newspaper Articles and Periodicals We used historical
newspaper articles and periodicals as sources of information for
assembling market wholesale data before 1950. We constructed a
database with year, price, and state of origination for each item.
Previous studies have used nontraditional datasets to study
pre-1950 marine ecological systems including menus (Jones 2008),
fishery logbooks (Alexanders 2009), and cookbooks (Levin and
Dufaults 2010). Fisheries catch data reported by the National
Oceanic and Atmospheric Administration (NOAA) and Food and
Agriculture Organization (FAO) dates back to 1950, therefore market
data for diamondback terrapin is not readily available before or
after 1900. The majority of newspaper articles and periodicals were
collected from the New York Times and Chicago Tribune. Inflation
Adjustment We converted menu and market prices using the 2010 Sahr
Consumer Price Index (CPI) adjustment inflation factor. Using
inflationadjusted market and menu values we graphically plotted
values to demonstrate the data trend for the market behavior of
supplydemand for terrapin and the relationship to the CPI. Each
inflationadjusted market and menu data point shows the purchasing
power of $1 in 2010 US (i.e. $120 per dozen in 1897 = $3158 in 2010
US dollars). Organization of Data To estimate the probability of
distribution of the menu and market data, we used statistical bins
as a graphing tool to show the mean value for four year intervals.
Discussion Methods Data Analysis Introduction Results Historically,
the first living resources to be affected by anthropogenic changes
have been those found in estuary systems and near-shore coastal
waters (Lotze et al., 2006, Lotze 2010). Of these resources,
freshwater and marine turtles have historically been utilized for
sale in food markets and the pet trade. Increasing demand for
turtles in Chinese food markets has led to a decline in several
Southeast Asian species and an increase in turtle imports from the
United States. Survival of the Southeast Asian Box Turtle (Cuora
amboinensis) is threatened throughout its range due to
international trade as a food commodity and use in Traditional
Chinese Medicine (TCM). At present time catch regulations in
Indonesia is non science-based, driven by demand to supply
importing countries. Diamondback Terrapin: Then & Now in
Chesapeake Bay, terrapin feed on various snails that damage marsh
grasses. Years before diamondback terrapin were favored as a
highclass delicacy, they were food for slaves. Demand for terrapin
proliferated once the potential of this ingredient was realized. In
most cases the terrapin was intended only for the richest of
diners. Terrapin stew quickly became a premium entre that was
featured on the menus of restaurants such as the Waldorf-Astoria in
New York City, NY and The Continental in Philadelphia, PA.
Recommendations We were able to quantify that the growth in
consumer demand led to an increase in the wholesale value of
diamondback terrapin from $20 (US$400 in 2010) per dozen in 1875 to
an astonishing $120 (US$3158 in 2010) per dozen at its peak in
1897. Correspondingly, menu prices ranged from $0.75/dish
(US$12.93) in 1863 to $4.50/dish (US$104.00) in 1907. Market
increased exponentially over a 20-year span from 1880 to 1900
reflecting the rapid growth in demand for terrapin. Market prices
declined soon after 1897, while menu prices began to decline in
1910. Compared with other commercially important living resources
of the bay system, the demand supply price behavior of terrapin
increased at a faster rate than that of canvas-back duck, oyster,
and blue crab. Market behavior of the Southeast Asian box turtle
appears to resemble that of terrapin during the late 1800s,
following a similar sharp increase in demandsupply price. Ephemera
Figure 3a. Menu from Hotel Knickerbocker in New York City, NY,
December 25, 1906. (New York Public Library Buttolph Collection). A
price of $3.50 ($85.25 in 2010US$) for Terrapin a la Maryland.
Figure 4. Newspaper clipping from the New York Times in 1891,
exclaiming the noticeable decline in terrapin for the markets and
absence from menus. Figure 3b & 3c. Such historical documents
can be used to map the prices of popular delicacies of the time,
some of which are no longer available for the consumer. In the US
and Indonesia the turtle is not typically favored as a local
delicacy in its country of origin, but the meat sells for up to
$20/lb. in China (MD legislators 2010). The US is a major exporter
of turtles to East Asian markets. In some ways the decline in the
Southeast Asian box turtle parallels that of the diamondback
terrapin in the US during 1880s to 1920s. Diamondback terrapin
(Malaclemys terrapin) now faces threats of over- harvesting after
years of high demand during the late 1800s and early 1900s. The
terrapin is a small, estuarine emydid turtle with a geographic
range from Cape Cod to Texas (Ernst et al., 1994) and is
exclusively endemic to coastal salt marshes, estuaries, and tidal
creeks of the Atlantic and Gulf Coasts of the United States.
Essential to the balance of the ecosystem As global wealth rises,
so does global consumption of meat, which includes wild meat.
Turtle meat used to be a rare delicacy in the Asian diet, but no
longer. China, along with Hong Kong and Taiwan, has vacuumed the
wild turtles out of most of Southeast Asia. -Eating the Wild, The
New York Times, January 26, 2009 Figure 5. Menu from the
Continental Hotel Restaurant in Philadelphia, PA, March 26, 1863.
(Jones Collection 2012). Prices of relevant species for this study
are identified with a checkmark and are reproduced in Table 1.
Note: Considered to be disposable ephemera, menus such as this one
from the Continental Hotel Restaurant (1863) rarely survived past
their use. Such historical documents can be used to map the prices
of popular delicacies of the time, some of which are no longer
available for the consumer. Figure 6. The consumer price index and
pre-1913 equivalent. Menu and market items are non-inflation
adjusted. Note the difficulty in identifying any rate of change On
this plot, the `850 value is US$0.56 meaning the purchasing power
of US$0.56 in `850 is the equivalent of US$`0 in 2010. In this
case, a plot of constant dollars would be a representative value of
US$10 for all years from 1850 to 2010 (Sahr 2010). Figure 8. Bin
plot showing inflation-adjusted market prices per dozen for
diamondback terrapin from 1850 to the late 1910s. Figure 9. Plot
showing the inflation rate of the menu entree prices of
diamond-back terrapin, Blue Crab, dozen oysters on the half shell,
and Canvas-back duck. Figure 7. Bin plot showing the
inflation-adjusted menu prices of diamondback terrapin from 1850 to
1950. Figure 10. Plot showing menu prices of diamond-back terrapin
from 1850 to 1950 and the Southeast Asian box turtle which was
around 1890-1900. References The future of the Southeast Asian Box
turtle and other turtles is now in question. Consumption patterns
in China resemble past terrapin demand supply. According to data
collected from turtle trade TRAFFIC reports, prices of turtle on
the global market have closely followed inflation rates as supply
has supported the demand (Schoppe 2009). In the late 1990s, prices
for turtle escalated due to the demand increasing faster than the
inflation rate. We believe this is due to Chinas recent economic
growth and enlarged middle class income per capita. If the current
exploitation rates of the box turtle continue, we suspect it will
become commercially extinct just as the terrapin did in the early
20 th century. We recommend that federal legislation be proposed
that would robustly regulate the imports/exports of turtles
destined for trade in Chinese food markets. Figure 1. Plot showing
the wholesale inflation-adjusted market values for Southeast Asian
Box turtles. (Schoppe 2009) Figure 2. The diamondback terrapin is
the only turtle in the world that is specially adapted to spend its
entire life in estuarine waters. (Ernst et al 1994) The reign of
the diamondback terrapin as an American delicacy was short- lived,
becoming a coveted dish of the wealthy by the 1880s and declining
in popularity by the 1920s. For reasons unknown, the market for
terrapin in the Northeastern US was met with an abrupt decline, in
effect becoming commercially extinct in northern portions of the
terrapins range (Hildebrand and Hatsel 1926). Concerns expressed in
national newspapers of the period indicate that increasing
extermination rates would lead to the depletion of the resource.
There are similarities in the data of diamondback terrapin
consumption in the US when compared with the Southeast Asian Box
turtle consumption in China (Figure 9). The menu price of
diamondback terrapin followed the rate of inflation from 1845 to
the early 1880s when supply was large enough to accommodate the low
demand. However, a distinct rise in the demand for terrapin in
restaurants rose faster than the inflation rate from the 1880s to
the early 1920s. We suggest this is due to the passing of the
Prohibition Act of 1919, because sherry wine was a main ingredient
in terrapin dishes. The Prohibition Act may have saved the
existence of the diamondback terrapin. The Southeast Asian Box
turtle appeared in Chinese markets in the late 1970s. Since then
the market price has followed the inflation rate, in which the
supply has supported the demand (Schoppe 2009). However, new 21 st
century demand for turtles in the market has led to a sharp
increase in prices (Figure 9). We believe this is accompanied with
Chinese citizens recent gain in expendable income. In the regions
of Southeast Asia where turtles do persist, biologists say, they
are fast disappearing to satisfy the huge, some say infinite,
demand for turtles in China. - The New York Times, May 4, 1999
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