The Harvest of Pacific Walruses by the Pelagic Whaling Industry, 1848 to Arctic and Alpine Research, Vol. 14, No. 3. (Aug., 1982), pp
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1 The Harvest of Pacific Walruses by the Pelagic Whaling Industry, 1848 to 1914 John R. Bockstoce; Daniel B. Botkin Arctic and Alpine Research, Vol. 14, No. 3. (Aug., 1982), pp Stable URL: Arctic and Alpine Research is currently published by The Regents of the University of Colorado, a body corporate, contracting on behalf of the University of Colorado at Boulder for the benefit of INSTAAR. Your use of the JSTOR archive indicates your acceptance of JSTOR's Terms and Conditions of Use, available at JSTOR's Terms and Conditions of Use provides, in part, that unless you have obtained prior permission, you may not download an entire issue of a journal or multiple copies of articles, and you may use content in the JSTOR archive only for your personal, non-commercial use. Please contact the publisher regarding any further use of this work. Publisher contact information may be obtained at Each copy of any part of a JSTOR transmission must contain the same copyright notice that appears on the screen or printed page of such transmission. The JSTOR Archive is a trusted digital repository providing for long-term preservation and access to leading academic journals and scholarly literature from around the world. The Archive is supported by libraries, scholarly societies, publishers, and foundations. It is an initiative of JSTOR, a not-for-profit organization with a mission to help the scholarly community take advantage of advances in technology. For more information regarding JSTOR, please contact Sun Jul 8 01:56:
2 Arctic and Alpine Research, Vol. 14, No. 3, 1982, pp THE HARVEST OF PACIFIC WALRUSES BY THE PELAGIC WHALING INDUSTRY, 1848 TO 1914 JOHNR. BOCKSTOCE New Bedford Whaling Museum, 18 Johnny Cake Hill, New Bedford, Massachusetts 02740, U.S.A. DANIEL B. BOTKIN Department of Biological Sciences and Environmental Studies Program University of California, Santa Barbara, California 93106, U. S.A. ABSTRACT The most important agent in the historical reduction of the Pacific walrus (Odobenus rosmarus) population in the 19th century was the pelagic whaling industry. From 1848, when the whaling grounds of Bering Strait were discovered, to 1914, by which time the industry had collapsed, whaling vessels made more than 2700 cruises seeking bowhead whales in the waters of the western Arctic. Large numbers of walruses also were taken during those voyages. We present here the results of the first systematic attempt to determine the size of the pelagic whaling industry's walrus harvest. Our data are drawn from the best extant records: the logbooks of the whaling vessels. Our data indicate that in the course of their voyages, the whalers captured approximately 140,000 walruses. INTRODUCTION Recently there has been popular speculation that the heretofore only Fay (1957) has attempted such a study. Pacific walrus (Odobenus rosmarus) population has Fay's important, pioneering analysis was based on hisreached such a high level that it may be approaching a torical harvest data derived from published sources, the crash (Jones, 1979). It has been suggested that this dra- best information then available. Recently, however, we matic increase may be the result of a severe suppression have been able to refine our understanding of the harvest of the population by commercial harvesting in the 19th carried out by the pelagic whaling fleets by analyzing the and early 20th centuries. The population may have been data in the logbooks of the whaling vessels. reduced to such a low level that large areas of the ani- Our data begin in It is unlikely that whaling vesmal's former feeding range were undisturbed for as long sels took Pacific walruses before this date, for until 1848 as a century. These unexploited areas apparently allow- no whaling vessel had passed far north of the Aleutian ed an abundance of food for the recovering population and Commander islands. In 1848 one ship reached Berwhen the commercial harvest ended (Lowry et al., 1980). ing Strait, but there is no evidence that it captured any Like some terrestrial mammal populations that have been walruses; however, in 1849 and the years immediately folintroduced to a new food supply, today's walrus popula- lowing, several ships took a few walruses, more out of tion, because of time lags in its birth and death rates, may curiosity than a desire for economic gain. It was not unhave increased beyond the carrying capacity of its eco- til the 1860s that a relatively steady market price for anisystem (Fay et al., 1977). mal oils and a severe reduction in the bowhead whale It would be useful to know the size of this historical population brought about the development of a delibercommercial harvest in order to assess this possibility, but ate walrus hunt /82/ $00.90 O1982, Regents of the University of Colorado
3 The pattern of the bowhead's annual migration was a third factor in the development of the harvest. From mid- June to early August the bowheads, traveling in the safety of the ice in the Chukchi and Beaufort seas, were generally inaccessible to the whaleships, which could only move north with the retreating margin of the pack ice. Although the ships were kept from the bowheads, they were within easy reach of vast herds of Pacific walruses. Because the costs of a whaling voyage were fixed, regardless of whether the crew was whaling, it was logical to harvest walruses for their oil and ivory and thus to derive revenue from an otherwise unproductive period of time. Although some ships made a concerted effort to hunt walruses in the early 1860s, the majority did not begin walrusing until after the Civil War. This intensive hunt continued until the early 1880s when a severely depleted walrus population and a declining price for oil made the hunt unprofitable. From the mid-1880s onward, walrusing was all but abandoned by the whaling fleet, which again turned its attention solely to bowheads (Bockstoce, 1980: 20-21). METHODS AND RESULTS We gathered the data on the walrus harvest in the course of a larger project on the historical reduction of the bowhead whale population (Bockstoce and Botkin, 1982). The first step in our investigation was to identify all whaling vessels that cruised in the Bering Strait region and Chukchi and Beaufort seas, to determine both the size of the fleet in each year and the names of those vessels for which logbooks might have survived. The basic sources for this phase of the study were the several newspapers published in New Bedford, San Francisco, and Honolulu that reported marine news. We also gathered data from more than 500 books, magazine articles, manuscripts, and government documents. These resources allowed us to expand our purview beyond the American whaling industry to include vessels of the other nations operating in the western Arctic: Hawaii, Germany, France, and Great Britain (Australia). In all, more than 25,000 reports were processed, giving us a record of more than 2700 annual cruises. Significantly, as our work advanced, fewer and fewer new cruises were found to add to our list; during the extraction of data from the last hundred or so documents, no new cruises were identified. Thus we believe that our list of whaling vessels operating annually in the western Arctic is accurate to within at least 99%. When we had completed our preliminary list of cruises, we were then able to locate the surviving logbooks and in turn extract the primary data from them. We extracted data for 516 complete cruises (approximately 19% of the total number of cruises) from logbooks spanning this entire period of whaling history. We compiled more than 66,000 days of observations and recorded -among other information-the following data for each day: the ship's name; the date and geographical coordinates; the weather, ice conditions, and visibility; and the species and number of marine mammals sighted, chased, and captured. The result was a continuous, representative sample of information on the activities of whaleships in the western Arctic from 1849 to The primary information for an analysis of the whaling fleet's walrus harvest appears in Table 1 and includes the total voyages we identified (column A), the total documents we read (column B), the number of these documents that repo;ted a walr'us harvest (column C), and the number of walruses reported caught (column D). In our attempt to find the best method for extrapolating from these data to obtain a figure for the total walrus catch by the entire whaling fleet, we assumed that the extant documents have no consistent bias toward or against ships that sought walrus. By grouping the data in 5-yr periods to obtain a larger sample per period, we calculated (Table 2) standard statistics for these data, including a mean catch, standard error and confidence interval. This calculation yielded an estimate of 133,000 k 48,000 walruses caught. It may be argued, however, that the data are best treated as a case study not open to an error estimate; consequently, we made a simple extrapolation, weighting the catch observed by the inverse of the fraction of the voyages read in each year. This weighting assumes that our 19% sample of all whaling voyages is sufficiently large to provide a trustworthy assessment of walrusing activities by the whaling fleet. This method yielded an estimate of 148,250 walrus caught (Table 3). DISCUSSION The two statistical methods yield results that are close and suggest that a reasonable estimate of the total number of walruses caught is approximately 140,000. As Table 3 shows, the vast majority of the whalers' walrusing activities took place in the 17 yr from 1867 to 1883 when about 90% of the total harvest was made. The catch statistics from our data sample have been segmented further in Table 4. It shows that the walrus were taken primarily during the months of June and July (while the whaleships, impeded by ice, moved slowly northward toward the northwest coast of Alaska to be ready to intercept the bowheads on their return migration from the Beaufort Sea in August and September). We have also subdivided the Bering, Chukchi, and
4 -- Walrus catch from data base A F C [I UHALING TOTAL WALRUS YEAR VOYAGES ggcyme\is ggcyntcus cfl1cy 't ? Y " I ; YOD c c A -Total known whaling voyages per year. B-Total number of logbooks examined. C-Number of logbooks examined that reported a walrus catch. D -Total number of walrus caught as reported by documents in column C. Beaufort seas into 19 regions which we constructed empirically to segregate areas where the greatest concentrations of ships' cruising had occurred (Figure 1). The ships had their greatest successes in July (Table 4) in the waters immediately north of Bering Strait (Figure 1, division G), a time and place when the walrus were found in great numbers and the ice had disintegrated sufficiently to allow the ships relatively easy access to the herds. Our data do not indicate whether the whalemen suppressed a particular subpopulation or age group because of the ships' proximity to certain segments of the population at regular times of the year; nor have we found any evidence within the documents to suggest that the whalers practiced selective harvesting during the hunt. Apart from estimating whalers' total catch, it is far more difficult to estimate the-total walrus kill. After the Civil War, when the hunters began using large calibre rifles (before then they had used harpoons and lances) to kill the animals, the loss no doubt increased dramatically through the escape of large numbers of mortally wounded animals. Although the records of the walrus that were caught and processed were faithfully kept, it is regrettable that few records were kept of the total kill for this lacuna hampers our understanding of the total damage done to the population by whalemen. The four that we have found are Northern Light 3 June 1876: retrieved 59 of 82 shot 21 June 1876: lost all 24 of walruses shot 26 July 1877: retrieved 118 of 130 shot Lucretia 21 June 1883: retrieved 18 of 40 or 50 shot Although insufficient for use in statistical procedures, these data suggest that no more than 60 to 70% of the walruses shot were retrieved and processed. Thus the total kill by the whaling fleet may have been approximately 200,000 to 235,000. Beyond the question of the size of the whalers' catch and kill lies the more difficult, if not insoluble, problem of estimating the total commercial catch and kill. Although the pelagic whaling fleet killed the greatest proportion of walruses in the 19th century and left a detailed body of data from which to reconstruct their harvest, vessels engaged in trade for walrus ivory left few records, and it is unlikely that their activities can be accurately measured. The 19th century trade for walrus ivory took several forms: small trading vessels, personal trade by whaling captains and officers, and trade both at posts near Chukotka and in Alaska. In the first case a number of schooners and brigs sailed annually from Honolulu, Hong Kong, Sydney, Hobart, and San Francisco (and after 1900, from Nome) to the Bering Strait region to trade alcohol and manufactured goods to the natives for baleen, furs, and ivory. Occasionally these vessels also hunted walruses for a short time when they had finished trading. Except in rare cases their logbooks have not survived, nor were their activities regularly reported in newspapers.
5 TABLE 2 Estimated total walrus catch using standard statistical methods" A B C D E TOTAL X THAT EST. TOT. HEAN ESTIMATED WHALING CAUGHT WALRUS CATCH/ TOTAL YEARS VOYAGES!%!US -VOYf?9ES- VOYAGE -- CATCH TOTALS adata are grouped by 5-yr periods to obtain a larger sample. The mean catch per cruise, standard error and confidence interval are given. Of those documents read, the percentage reporting a walrus catch is given in column B. The estimated total number of cruises on which walruses were caught (column C) is calculated by multiplying the entry in column B by the total number of voyages for that period (column A). The mean catch per voyage (column D) is the average catch per vessel among those vessels reporting a walrus catch. In column E, the estimated total catch is obtained by multiplying column C by column D. I FIGURE 1. Regions of the Bering, Chukchi, and Beaufort seas. 186 / ARCTIC AND ALPINE RESEARCH
6 TABLE3 Estimated total walrus catch E ucuncal vgnq rsn! cnich A-Number of walruses caught in documents read. B -Cumulative catch. C- Weighting factor (the total number of voyagedthe num- ber of documents read). D- Weighted catch (CATCH x WFACTOR). E- Weighted cumulative catch , I9O , rr ad , 2 A TABLE4 Summary of the sample Pacific walrus catch per month and 10-yr period, Total May June --- July _ August September , , Total 22, ,
7 Similarly, there is no documentation for the ivory trade carried on by whalemen with the natives for personal gain, and furthermore, surviving records of the trading companies are sparse. But even if these documents had survived, one would be faced with the possibly insoluble problem of estimating the factor by which the natives increased their subsistence hunt to provide raw materials for the trade market. ACKNOWLEDGMENTS We are indebted to Dr. Francis Fay for his critical comments and to our assistants who contributed so much to the success of the project: Elizabeth Rex, who was in dayto-day charge of the data extraction program; and to Tad Reynales, who carried out the majority of the computer programming and statistical analyses. Part of the work was carried out under contract with the Institute of Marine Science, University of Alaska, with funding by the Bureau of Land Management through interagency agreement with the National Oceanic and Atmospheric Administration, as part of the Outer Continental Shelf Environmental Assessment Program. Bockstoce, J. R., 1980: A preliminary estimate of the reduction of the western Arctic bowhead whale population by the pelagic whaling industry: Marine Fisheries Review, 42 (9-10): Bockstoce, J. R. and Botkin, D. B., 1982: The historical status and reduction of the western Arctic bowhead whale (Balaena mysticetus) population by the pelagic whaling industry, Report of the International Whaling Commission, special issue no. 5. (In press.) Fay, F. H., 1957: History and present status of the Pacific walrus population. Transactions of the Twenty Second North American Wildlife Conference. Washington, D. C. : Wildlife Management Institute, REFERENCES CITED Fay, F. H., Feder, H. M., and Stoker, S. W., 1977: An Estimation of the Impact of the Pacific Walrus Population on Its Food Resources in the Bering Sea. Final Report to U.S. Marine Mammal Commission on Contracts MM4AC-006 and MM5AC-024. Report Nos. MMC-75/06 and MMC-74/03. Washington, D.C.: Marine Mammal Commission. Jones, T., 1979: Return of the Pacific walrus: Too much of a good thing? Alaska Magazine, September, pp , Lowry, L. F., Frost, K. J., and Burns, J. J., 1980: Feeding of bearded seals in the Bering and Chukchi seas and trophic interaction with Pacific walruses. Arctic, 33: Ms submitted November 1981
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