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,;.:;. I / Please Retum to DOCUMENT CONTROL Su5itna Joint VPntt~n~ Document NumbP~ ,,~ ,' l ..:.. /,_,;.:;. i / Please Retum To DOCUMENT CONTROL >" '. '<It. ·- ~, .. "'-, --~..... t'~",:<;., - ' ... ·,¥ c~......_ ~"''"' -A"i~~~·/~ ~ ... -. ·.:... ~~·~, ):·,.,., ";./':: . 0 • • ~ ' • • • • • • ,. • . • ' • • . ¢' ll ( ' c • • r • • - . RESPONSES OF GRIZZLY BEARS TO HYDROCARBON EXPLORATION ON r RICHARDS ISLAND, NORTHWEST TERRITORIES, CANADA LEE HARDING, Environmental Protection Service, Department of Ftshenes and Environment, P.O. Box 2310, Yellowkmie, Northwest Terrllones X1A 2P7 JOHN A. NAGY, Canadian Wildlife Service, Fisheries and Environment Canada, 10025 Jasper Avenue, Edmonton, Alberta TSJ 2X9 1 Abstract: Observations on numbers, distribution, locations of dens, and responses of grizzly bears (Ursus arctos L.) to industrial disturbances f were noted on Richards Island, Northwest Territories, Canada, during 1972-75. During this period, 13-23 bears occupied the 2,460-km2 study s area. Bear responses to hydrocarbon exploration and related activities were observed 23 times, and 35 dens were located. Bears were distributed t evenly over the study area during summer but avoided camps by 1 km or more. Density was comparable to that of other arctic mountain and coastal bear populations, and no decline was apparent. Effects of industrial activities included slight loss of habitat, disturbance of denning areas resulting in abandonment of dens, and relocation of problem bears. It is predicted that proposed natural gas production facilities will not be compatible with _ontinued survival of grizzly bears in Richards Island. Grizzly bears have so long been abundant in the responses to hydrocarbon exploration collected by the Mackenzie Delta region that one of the Eskimo place­ senior author during the course of these studies. names is Aklavik, or "Bear Country" (Porsild 1945). The studies were supported by Imperial Oil Ltd., Richards Island in particular has been the location of Gulf Oil Canada Ltd., Shell Canada Ltd., and Cana­ numerous reported sightings (Clarke 1944, Porsi1d dian Arctic Gas Study Ltd., who gave permission for 1945, Macpherson 1965, Nolan et al. 1973). Although the pt,Iblication of data. generally protected east of the Mackenzie River. grizzly bears are hunted within the Reindeer Grazing STUDY AREA Reserve, which includes Richards Island (Northwest Richards Island, a part of the Mackenzie Delta, has Territories 1971). Yet arctic grizzly bears are slow to an arctic climate and biota influenced by the Mackenzie mature and reproduce (Curatolo and More 1975) and River, with attendant warmer weather and seasonal they probably cannot stand increased pressures on their flooding of lowlands (Gill 1972). lts sou them apex populations (Macpherson 1965). The spread of modern 69°00' N, 134°401 W coincides with the northern tree culture has caused grave concern for the grizzly's con­ limit. Vegetation is typical of arctic coastal tundra. tinued survival, both in areas of the western Canadian Because the area is a complex interface between arctic Arctic (Macpherson 1965) and on the North Slope of and subarctic climates, forest and tundra biomes, low­ Alaska (Bee and Hall 1956). The-threat d hydrocarbon land and upland terrain, and freshwater and marine expioration ~o grizzly bears has been recognized since ecosystems, it supports an abundance and a wide vari­ 1956 (Bee and Ha111956, Barry 1959). Since then, ety of wildlife (Harding 1974). Topography includes beats ... have been ,.studied by .Quimby (1974), Slaney deltaic floodplains and Pleistocene uplands (Mackay (l974},::-Pearson·(1975), :Pearson and-Nagy (1976), and 1963) ranging in elevation up to 70 m above sea level. others·in this· general "regfort in ·otder to predict the Hydrocarbon exploration facilities in the area in­ impact of proposed industrial development. clude 3 base camps, drilling rigs (each with associated Oil companies have explored Richards Island since camp and airstrip), a communication rower with the rr.id-1960s. Oil and natural gas have been found generating plant, gravel (borrow) pits, and a network of i and construction of production facilities may begin winter roads. These facilities and associated aircraft I soon. flight corridors are distributed over approximately half ! Grizzly bear studies by F. F. Slaney and Co. Ltd. the study area and are concentrated in the southwest during 1072-75 were part of a broader environmental portion of the island. program to determine indices of mammal density and to Facilities proposed for the study area include wharf identify and describe important habitats near areas of sites, more gravel mining sites, 2 natural gas processing possible future facilities for natural gas production on plants, an elevated pipeline gathering system radiating Richards Island. Results were reported by Slaney from each plant (Slaney 1974), a 122-cm buried gas trunk (1974, 1975) and by Harding (1976). The purpose of line, and all-weather roads to Tuktoyaktuk and Inuvik the present paper is to discuss results from the above (Foothills Pipe Lines Ltd. 1975, Pearson and Nagy studies in the context of bear observations and den site 1976). locations in relation to existing gas expJoration During 1972 and 1973, a mirninum of 13 and 23 facilities and to present new observations on grizzly grizzly bears, respectively, occupied the 2,460-km2 I I ' _j . .... 278 BEARS - THEIR BIOLOGY AND MANAGEMENT study area (Slaney 1974). During 1974 and 1975, 14 Industry-related Movements bears (including 3 sow-cub groups) and 16 bears (in­ Of 17 instances where bear movements were fol­ cluding 4 sow..cub groups), respectively, denned on the lowed in detail within 7.2 km of camps, 16 of the bear island (Harding 1916). groups did not venture closer than 1.0 km to the camps. Because there was no apparent seasonal movement Tracks measured during the summer of 1973 indicated to or from denning areas, the numbers of bears denning that on at least 8 occasions, bears foraged or traveled in the study area were considered representative of the within 2.6-7.4 km of industry camps without being population densities. These densities of l bear per 176 seen and without entering the camps. A good example 2 2 km and 154 km are similar to those reported by occurred in July 1973 when tracks of a large single bear 2 Curatolo and More ( 1975) of 1 bear per 119-228 km in were located and followed along a beach towards a 2 arctic mountains, and 1 per 200 km by Pearson and drilling rig. The tracks indicated that as the bear came Nagy (1976) on the arctic coast. Of the 35 dens lo­ in sight of a drilling rig 1.4 km away, it turned and then I cated, 2& (80 percent) were within general areas of bypassed the rig, keeping approximately the same dis­ hydrocarbon exploration activity as indicated by flight tance from it. On a ninth occasion, tracks of 1 bear corridors (Slaney 1974, 1975). were found adjacent to an active gravel pit, although the bear had not been noticed by shift workers. METHODS In April 1974, 3 bear dens were located within 4.8 During May-September, 1972 and 1973, observa­ km south of a borrow pit and the associated camp. tions were collected opportunistically during the course Upon abandoning their dens, 2 single bears and a sow­ of other studies. These observations covered the study cub group traveled generally northward toward the area but concentrated on known bear denning areas and camp, bypassing it by 1.2, 1.0, and 2.0 km, respec­ areas of proposed hydrocarbon development. tively. An adult male spent several days foraging 3.0 During 1974-15, aircraft, snowmobiles, and snow­ km from a drilling rig that was audible to the inves­ shoes were used to track bears after their emergence tigator at that distance but was not visible because of a -- from winter dens, and in areas of industrial activity. low. intervening h:ll. Similarly, another adult male for­ The Canadian Wildlife Service began a capture­ aged for several days approximately 7.2 km from a marking program in 1974 on the study area. Radiocol­ staging camp. The camp was visible to the investigator lars and color-co..;ed markings facilitated the monitor­ at that distance. Tracks indicated that these male bears ing of individual bed" movements. Reactions of bears finally left the vicinity of the camps without venturing to Cessna 185 and 337 and Be11206 aircraft approaches closer. at various altitudes and horizontal distances were re­ In 1975, a single bear vacated a den 1.6 km from a '<'~ corded during the den surveys of 1973, 1974, and gravel excavation camp and bypassed the camp by ap­ 1975. Industrial personnel were interviewed with re­ proximately l.O kin. Similarly, a single adult and a spect to hear-man encounters. sow-cub group, which denned 3.2 and 6.4 km, respec­ tively, from a staging camp, did not approach the camp. RESULTS AND DISCUSSION Only twice did bears persist in remaining near camps. In July I 974, a subadult female grizzly was Den Disturbance seen repeatedly near a camp's sewage lagoon. At the At least 2 denning bears were disturbed by request of camp administrators, Canadian Wildlife hydrocarbon-related operations during the study. In Service personnel tranquilized and relocated the bear . January 1973, a seismic vehicle was driven over an .~n 1975, personnel of the same camp again requested active den, causing the be·ar to abandon it. The bear left the removal of a bear that had been observed for several the area and was observed several times before it was days among the buildings. Later, however, the bear left shot by an Eskimo trapper during March or April. of its own accord. Bears entered camps briefly on 4 Again, In November i 973, a denning bear was dis­ other occasions. Each of 3 different industry staging turbed during gravel mining operations. The bear fled camps were approached once by single bears during the area and its den was destroyed.
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