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Duncan Murrell - A Whale of a Time

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Duncan Murrell - A Whale of a Time

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  • Dramatic declines in harbor seal numbers have been documented in Alaska, including a decline from approximately 11,000 seals to 1,000 seals during 1976-1988 on Tugidak Island near Kodiak – a site previously considered to host one of the largest concentrations of harbor seals in the world. That decline resulted in the listing of Alaskan harbor seals as a species of special concern by the Marine Mammal Commission. A 63% decline in harbor seal numbers also occurred in Prince William Sound during 1984-1997. Although seal numbers in the Kodiak area have been steadily increasing since the early 1990s and seal numbers in PWS began to stabilize and show signs of increase in 2002, both populations remain severely depressed compared to pre-decline population levels. Similarly, a greater than 65% decline in seal numbers has been documented in Glacier Bay since the early 1990s. Seals in Glacier Bay continue to decline at a precipitous rate despite conservation measures in place to control vessel traffic, commercial fishing, and subsistence harvest. The declines and lack of substantial recovery of some harbor seal populations in Alaska contrasts sharply with other parts of the world, where the species has proven to be resilient and capable of fairly rapid recovery from perturbations. There is no evidence that movements of seals between areas can explain these declines; the cause is unknown, but multiple factors are likely involved. Harbor seals appear to have responded severely to changes in carrying capacity and therefore may be particularly sensitive indicators of future change, such as ocean warming.
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  • The harbor seal (Phoca vitulina), a widespread species in both the north Atlantic and Pacific oceans, is found in Alaska along the coast extending from Dixon Entrance north to Kuskokwim Bay and west throughout the Aleutian Islands. Harbor seals, and other phocid (true) seals, also are called “hair” seals, which helps distinguish true seals from fur seals. Harbor seals haul out of the water periodically to rest, give birth, and nurse their pups. In winter seals spend up to 80% of their time in the water. In spring and summer they spend more time hauled out during pupping and moult season. Reefs, sand and gravel beaches, sand and mud bars, and glacial, pan ice, and sea ice are commonly used for haul-out sites. The moulting lines on these seals are clearly visible.
    Alaska-harbour-seal1.jpg
  • The most common predator of harbor seals is the killer whale. Other predators include sharks, sea lions, and land predators such as wolves, bears and coyotes. Since implementation of the Marine Mammal Protection Act in 1972, hunting has been restricted to Alaska Natives. Harbor seals play a crucial role in the culture and diet of Alaska Natives; the annual subsistence harvest of harbor seals in Alaska is about1,800 to 2,900 animals, with fewer seals harvested in recent years. The harbor seal's ability to damage or remove salmon from gillnets has caused conflicts between seals and commercial fishers in Alaska. This behavior creates economic losses for fishers and often fosters an antagonistic attitude toward seals. The Copper River Delta, the mouths of the Stikine and Taku rivers, and portions of Bristol Bay are areas with notable harbor seal-fishery conflicts. Sometimes seals are caught and killed or injured in fishing gear, primarily in gillnets and occasionally in crab pots.
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  • The total Alaska harbor seal population is estimated at approximately 141,000 in non-glacial sites and approximately 15,000 in glacial fjords. Harbor seals are difficult to census because they can only be accurately counted when they are hauled out. They haul out at different times of the day at thousands of locations in Alaska; both at terrestrial sites and on glacial ice calved from tidewater glaciers. During any survey, some seals are in the water and not available to be counted while others are hauled out, but the proportion of the total population hauled out at any given time is unknown and must be estimated. One way to arrive at this estimate is to radio tag seals in the area, prior to conducting a survey. When the survey is conducted, the proportion of radio-tagged seals that are not hauled out provides a correction factor to estimate the total seal population (e.g., if 3 of 10 tagged seals were not hauled out, an additional 30% would be added to the count of seals hauled out to estimate the total population).
    Alaska-harbour-seal6.jpg
  • Harbor seals show variable movement patterns depending on their sex and age class, with some exhibiting considerable localized travel but noseasonalpatterns,whileothersshowmoreextendedmovements,particularlyduringthewinter. Seasonaluseofglacialfjords,wheremanyfemalesaggregateto give birth on icebergs in the summer, is common. Satellite tagging studies have shown that pups may range up to 232 miles (374 km) from their birth site, although most movements are less than 62 miles (100km) away. Juvenile seals can make more extensive movements of up to 186-310 miles (300-500 km) away from their tagging location; however, most remain within 100km. Adult seals typically make shorter movements and on average are within 37 miles (60km) of their tagging site. More recent tagging of seals that occupy glacial fiords has revealed movements of seals from one glacial fiord to another as well as one extensive movement of a juvenile female seal from Glacier Bay in southeastern Alaska to Prince William Sound, an estimated straight-line distance of ~ 520 miles (830 km). As more seals are being satellite-tagged, much more information is becoming available about winter and summer movements.
    Alaska-harbour-seal2.jpg
  • In Alaska, single pups are born between May and mid-July. Young pups are able to swim almost immediately after birth. They normally remain with their mothers about one month, after which they are weaned and separate from their mother. At that time over half their body weight may consist of fat, providing them a head start on self-sufficiency.While harbor seals will often voluntarily swim close to humans on beaches or in small boats, seals resting on land or ice are wary of people and will rush into the water if approached too closely. If disturbed too often, seals have been known to abandon favorite haul-out sites or their pups. I was able to approach this sleeping seal pup close enough to touch it. They are usually much more alert than sea lions because there is less distracting noise and commotion. I have always been extremely careful not to disturb any of the animals that I have stalked.
    Alaska-harbour-seal3.jpg
  • Harbor seals (Phoca vitulina), are “true seals” of the Phocidae family, also sometimes called “common” or “hair” seals. They are covered with short, stiff, bristle-like hair. Coloration varies, but two basic patterns occur: light gray sides and belly with dark blotches or spots, or a dark background with light rings. They can be distinguished from other pinnipeds, such as fur seals and sea lions, by the absence of external ear flaps; only a small hole (the external pinnae, or opening to the ear canal) is visible on either side of their head. When on land, harbor seals move awkwardly by undulating in a caterpillar-like motion because their pelvic bones are fused, preventing them from moving their hind flippers under their pelvis to walk. In the water they are graceful and efficient swimmers, using their fore flippers as rudders and their hind flippers for propulsion by clasping both hind flippers together, splaying webbed toes and moving the large hind flippers side to side.<br />
Harbor seals weigh about 24 pounds (11 kg) at birth and gain weight rapidly during a month-long suckling period; perhaps doubling their weight. They can reach five to six feet (1.5-1.8 meters) in length. Average weight for adults is about 180 pounds (82 kg); males are somewhat larger than females and can weigh up to 285 pounds (129 kg).
    Alaska-harbour-seal7.jpg
  • Port Houghton is a deep inlet on the mainland just to the north of Petersburg. It was one of my favourite peaceful retreats to find solitude in Southeast Alaska, and to enjoy and photograph the beautiful vegetation. It was my favourite place for vegetation because it has such an array of consummate displays of all the lowland, coastal vegetation habitats: flower meadows bursting with blooms and colours: muskeg resplendent with colour and minute detail, especially in the fall, dotted with inky ponds, and lichen and moss festooned dwarf trees: before the surrounding primary old growth temperate rain forest extends up the flanks of the surrounding mountains. Foraging bears frequent the meadows in the summer or dine on salmon in the rivers in the fall. At the head of the inlet there is a salt chuck  with a rock where harbour seals haul out.
    Alaska-vegetation1.jpg
  • Port Houghton is a deep inlet on the mainland just to the north of Petersburg. It was one of my favourite peaceful retreats to find solitude in Southeast Alaska, and to enjoy and photograph the beautiful vegetation. It was my favourite place for vegetation because it has such an array of consummate displays of all the lowland, coastal vegetation habitats: flower meadows bursting with blooms and colours: muskeg resplendent with colour and minute detail, especially in the fall, dotted with inky ponds, and lichen and moss festooned dwarf trees: before the surrounding primary old growth temperate rain forest extends up the flanks of the surrounding mountains. Foraging bears frequent the meadows in the summer or dine on salmon in the rivers in the fall. At the head of the inlet there is a salt chuck  with a rock where harbour seals haul out.
    Alaska-vegetation2.jpg
  • It felt better to arrive safely at yet another beautiful campsite than I could have ever imagined! I had a wonderful time there before in 1990, especially photographing the colony of breeding seabirds on the cliffs at the northern end of Lunga. It is the smallest of the four main islands in the Small Isles, measuring roughly 2.5 miles (4.0 km east to west) and has a population of around 30, mostly living near the harbour at Port Mor. The other settlement on the island is the farm at Gallanach, and during this visit I was fortunate enough to get to know the family living there, and to have a glimpse of their isolated traditional subsistence lifestyle. The only road on the island, about 1.6 miles long (2.5 km) connects the farm to the port. I camped just behind a really nice sandy beach, where there were often some white horses grazing or walking on the beach. There were plenty of grey seals bobbing their heads above the water and seaweed around the bay. There is a characterful old house there, which is available for holiday rental, and I got to know, and dined with a lovely family staying there. Although it’s such a small community I had a very sociable time while I was there and met some very interesting people. There was a very nice café and shop at Port Mor, that I enjoyed snacking in and meeting some of the locals and visitors. Apart from observing and photographing the breeding seabirds as before I also climbed the main hill on the island, Beinn Airein, 137 metres (449 ft) high. The view out across the choppy ocean dotted with islands was tremendous, and gave me such a feeling of expansive space. I could visually embrace the relentless passage of the strong wind from the distant horizon, whipping up the sea into ranks of advancing whitecaps, before flying up to nip my face with its invigorating salty chill. I was glad that I had braved the adverse sea conditions for another special visit to the Isle of Muck and hope that it won’t be so long before my next visit.
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