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10 Traits of Post-Ice-Age Greenland

by Robert C. Brears Blog

During the last ice age, most plants and animals vanished from Greenland as a thick sheath of ice coated the landscape. Once this ice started to retreat around 12,500 years ago, it left boulders and raw mineral earth exposed for plants and animals to colonise. This colonisation, however, did not occur overnight: Due to Greenland’s geographic isolation and difficult topography, it was a slow, slow process.
10 Traits of Post-Ice-Age Greenland

Regionen: Arktis

Reiseziele: Grönland

10 Key Traits of Post-Ice-Age Greenland to Upgrade Your Arctic Awareness

During the last ice age, most plants and animals vanished from Greenland as a thick sheath of ice coated the landscape. Once this ice started to retreat around 12,500 years ago, it left boulders and raw mineral earth exposed for plants and animals to colonise. This colonisation, however, did not occur overnight: Due to Greenland’s geographic isolation and difficult topography, it was a slow, slow process.

1. Putting Down Roots in Greenland

Grasses, sedges, and other species of heath were the first arrivals, and are still commonly found in Greenland. Scientists have been able to work out how plants colonised Greenland by examining ancient pollen samples found in deposits at the bottom of lakes: Dwarf birch came to western Greenland around 9,000 years ago, and around 4,500 years ago – roughly the same time humans were first boating onto Greenland shores – green alders were taking up residence there.

By Foledman (Own work) [CC BY-SA 4.0], via Wikimedia Commons

2. Greenland: Earth’s Second-Largest Freshwater Source

Though many think of Greenland as a desolate ice-crusted wasteland, those who’ve embarked on Greenland cruises know otherwise: A variety of flora and fauna thrive there, supported by the abundant freshwater supply. This supply comes chiefly from the Greenland Ice Cap, made up of about 1.7 million cubic kilometres of ice. That’s nine percent of the world’s total supply of fresh water. Every spring, melt from this ice and snow replenishes streams, lakes, and other water bodies.

3. Wonderful Waterside Homes – for Greenland Birds

A number of birds use the freshwater sources for breeding and foraging – such as harlequin ducks, which nest on stream shores and beside waterfalls. Great northern divers and red-throated divers breed on islands in freshwater lakes, then travel to the coast to feed on the abundant fish supply. Birds also utilise these freshwater bodies for feeding, taking in seeds, aquatic plants, larvae, crustaceans, and fish.

By Ómar Runólfsson [CC BY 2.0], via Wikimedia Commons

4. Greenland’s Assorted Springs

Hot springs are another source of fresh water in Greenland. Some ice over in the winter, while others remain just above freezing year-round. These springs are found in eastern Greenland, a terrain partly composed of basalt, and are home to a diverse range of species for whom the warm waters accelerate growth. For instance, the water alwart is found by hot springs and is Greenland’s tallest herb, while four orchid species are found near these springs and consequentially get to enjoy an extended growing season. Two of Greenland’s rarest plants are also found around hot springs in eastern Greenland: One species, the purple avens, has only been seen in hot springs with temperatures of 54 degrees Celsius. The hot springs are also home to snails and various types of beetles. By contrast, cold springs are home to a different cast of creatures: A certain cold spring in eastern Greenland is the only place on the island where the freshwater mite can be found.

5. Healthy Host of Greenland Animals

Greenland’s terrestrial areas are home to four herbivorous mammals: the muskox, reindeer, Arctic hare, and Arctic lemming. In addition, geese, grouse, and some duck species are found on land, but are dependent on the availability of plant cover. Geese are one of a handful of Greenland-based birds that have a plant diet, so they live on land when they’re not migrating between wintering and breeding areas. After they breed, they usually moult over a two-week period before being able to fly again. Since the process of moulting is so energy-intensive, the areas they moult in must have ample food. These areas also have to be near open water, giving the geese a place to retreat if danger approaches.

6. High Country Greenland Reindeer

Along the west coast of Greenland, reindeer are found on terrain consisting of hilly ranges, valleys, streams, high mountain areas, lakes, and scrub forests. Their diet is mainly grasses and sedges during the summer, with lichens added in during the winter. Reindeer do not remain in one location during the colder months, instead migrating for optimum foraging possibilities. The reason being that they cannot dig into snow for their food very easily, so they prefer areas where sustenance is more accessible – usually where vegetation is exposed by the wind. During the warmer months, reindeer head to the mountains in search of cool places with the least pesty insects. Females usually find undisturbed locations, known as calving areas, to bear their young. During this period, these females can be very flighty: Any disturbance can potentially send them fleeing, leaving their calves behind.

7. Muskoxen Seeking Greenland Silence

Muskoxen live in north and east Greenland, in terrain that alternates between highland and lowland. (There are also populations of re-introduced muskoxen in western Greenland.) The diet of the muskox is mainly willows, sedges, and grasses, with the proportion differing with season and location. When female muskoxen calve, they are highly sensitive to disturbances, and so they seek quiet places.

8. Greenland Predators on the Prowl

Predators stalk the Greenland landscape too. Lemmings, for example, are found all the way up to the northern part of the island. There they survive the frigid winters by building nests and tunnels under the snow. Their predators include the Arctic fox, snowy owl, skuas, and raven, among others. Arctic foxes are found in both the north and northeast of Greenland, both as predators and scavengers. They feed on Arctic hares, lemmings, seals, and sometimes even muskoxen.

9. Greenland’s Wealth of Whales

Greenland’s waters are home to several species of whale, each with its own particular diet. Blues and bowheads feed exclusively on crustaceans, while belugas also take in fish: Greenland cod, ocean perch, and catfish. Narwhals enjoy polar cod as well as eelpouts and cephalopods. Killer whales (or orcas) and sperm whales target the largest ocean creatures. In fact, orcas are known to attack baleen whales, narwhals, belugas, and walruses, while sperm whales sometimes hunt sharks.

10. Large-Scale Greenland Hunters

Among the seal species, harbor seals feed only on fish, including herring and salmon. Bearded seals also eat benthic fauna, including snails, sea cucumbers, and sea squirts. Walruses, on the other hand, have a very narrow diet in Greenland, mostly eating benthic bivalves taken from waters less than 80 metres deep. They do at times hunt seals when ice conditions are so bad they cannot reach the bivalves. Polar bears mainly feed on seals: ringed, bearded, harp (on pack ice) and hooded. When the opportunity present itself, polar bears also eat marine birds, and on land they can even catch geese.

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