Due to the Aquatic Conservation Initiative for offering this month’s weblog.
Distribution and Inhabitants
Unfold throughout the North Atlantic, from the Gulf of St. Lawrence, into Baffin Bay, to the Greenland Sea, all the way in which to the White Sea of northern Russia lives the Harp Seal (Pagophilus groenlandicus). Residing in 3 most important populations – within the Greenland Sea, the White Sea, and most notably, the Northwest Atlantic – this marine mammal spends its life braving the weather within the Nice White North. For Canadians fortunate sufficient to identify a Harp Seal within the wild, they probably belong to one in all three herds throughout the Northwest Atlantic inhabitants: the Entrance herd, off the East coast of Newfoundland and Labrador; the Gulf herd, close to the Magdalen Islands, or the close by smaller, northern Gulf herd. These three herds boast a mixed 7.4 million people, and with a lifespan of as much as 40 years, there isn’t a doubt that Harp Seals are properly tailored for his or her life on the ice.
Life Levels
To raised perceive this unbelievable species, it’s best to start out on the very starting:
Winter
Abruptly thrust onto the pack ice and into frigid winter situations as a recent, tiny new child – the begin to a Harp Seal’s life can’t be described as a nice one. Relatively, it’s a testomony to the resilience of this species – completely designed for the cruel Arctic situations through which it spends most of its life.
Child Harp Seal sporting the white coat it’s going to put on for the few weeks of its life.
For the primary two weeks of life, the appropriately named, “White Coats” spend their days near mother for heat, security, and most significantly, meals. Whereas their fluffy coat of vibrant white fur serves them properly for each heat and camouflage whereas they nurse and develop within the early weeks of life, Harp Seal pups don’t look this fashion for lengthy. They start their transition to their “Beater” coat (named after the feel of this new fur), which they may sport for the subsequent 4 to five weeks. Throughout this time, mother resumes feeding, step by step weans her pup, and begins making ready herself for the fast-approaching breeding season.
Tyler is a “humorous, sassy” Harp Seal who lives on the Huntsman Marine Science Centre in New Brunswick. (Photograph: Rachael Brown.)
Spring
Nonetheless rising, pups construct their confidence by studying to swim and dive throughout spring. That is after they transition into the “Bedlamer” or silver coat, which is shorter, denser, and ideal for swimming in icy water. Whereas the ice melts, these “younger of the yr” study to fend for themselves, whereas the adults start shifting towards extra productive feeding areas within the open ocean.
Summer time
The Bedlamer coat will final till the pup is totally grown at 6 months previous. With the arrival of summer season emerges their last outfit – gray or silver (typically darkish brown/black) fur, with the distinct “harp” marking that everyone knows and love. The harp not solely offers this species its identify, but in addition turns into an apparent marker for identification (every particular person is exclusive!) within the wild. Its perform for survival is debated, though it’s thought to assist with camouflage.
As an grownup, Harp Seals within the Northwest Atlantic inhabitants spend their summers in productive offshore feeding grounds all through the Canadian Arctic, Greenland, and off the coast of Newfoundland and Labrador.
Fall
All through fall, Harp Seals begin to transfer southward as soon as once more, returning to their breeding and hauling-out areas within the Gulf of St. Lawrence and Newfoundland and Labrador. Whereas the younger of the yr won’t attain sexual maturity till 5-7 years of age, the older adults will proceed feeding, in preparation for the vitality calls for of winter, whelping season, and subsequently breeding season as soon as once more.
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Within the Water
Whereas they is probably not essentially the most sleek creatures on land, within the water, Harp Seals swim with unbelievable grace, fluidity, and precision. Their sturdy, webbed hind flippers could be opened and closed independently of each other, propelling their streamlined physique by the water, executing twists and turns extra eloquently than any dancer I’ve ever seen. Maybe their most spectacular expertise: their means to dive. Harp Seals can dive to depths of as much as 300 metres and maintain their breath for over 20 minutes when obligatory! With elevated oxygen storage of their blood and muscle mass, buoyancy help from their thick layer of blubber, and a expertise for bradycardia (a slowed coronary heart price whereas diving – 4 to six BPM!) these expert hunters can use their delicate vibrissae (whiskers) to hunt out and seize their prey with relative ease in darkish waters. Cod, Capelin, Herring, Sculpin, flatfish, and small crustaceans are sometimes no match for a hungry Harp Seal at time for supper.
Babette was a feminine Harp Seal who lived for various years on the Ocean Science Centre in Logy Bay, Newfoundland and Labrador. (Photograph: Rachael Brown)
Harp Seals are actually exceptional creatures, completely suited to their icy surroundings and able to thriving in a number of the harshest situations on Earth. If you happen to’re fortunate sufficient to identify one of their pure habitat, it’s actually a magical expertise!
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