Pelagic Cormorant

Pelagic Cormorant

Baird’s cormorant, Pelagic shag, Violet-green cormorant

Kingdom
Phylum
Class
Subclass
Infraclass
Superorder
Order
SPECIES
Phalacrocorax pelagicus
Population size
400,000
Life Span
18 yrs
WEIGHT
1474-2438 g
LENGTH
64-89 cm
WINGSPAN
1-1.2 m

The Pelagic cormorant of the Pacific Coast is a cormorant that is small and slender, and exclusively marine in habits, but preferring inshore areas. It is black, and its body has a glossy iridescent green with violet-bronze, and violet-purple on its neck. The breeding plumage includes white patches on the flank, red skin at the base of the bill, two head crests, and long white feathers on the neck and upper-back. This species may be solitary when feeding but gregarious during other times, when groups perch together on rocks near the water, holding their wings out to dry. Often they are shyer than other cormorants and harder to approach.

Distibution

Pelagic cormorants inhabit the Bering and Chukchi Seas along the North American coastal Pacific area to Baja California and the Asian coast to south China. They breed on the North Pacific coasts (South West Alaska and North East Siberia), and winter south to Baja California, Japan and East China. These birds frequent rocky bays, and particularly deep waters near the base of cliffs. Nesting is both on mainland coasts and islands, often on inaccessible sites, such as steep slopes or narrow ledges on cliffs.

Climate zones

Habits and Lifestyle

Pelagic cormorants forage only during the day and usually alone in sheltered bays and inlets. They usually swim until locating prey, and though preferring shallow waters, may dive to 180 feet (55 m) to on or near the floor of the sea, steering with their wings and propelled by their feet as they chase their prey under water. On emerging from the water, they perch in a dry area to spread their wings out to dry. These birds are very adept both swimming and flying and can jump straight out of the water and into the air. On land a Pelagic cormorant is quite clumsy and walks with a high-stepping, waddling gait. When landing, they usually scratch at the ground and when feeling threatened, they dart at their opponents with their bills, shaking their heads and making gargling noises. This species is often sedentary, but populations will sometimes perform a short post-breeding dispersal. Individuals make groaning and hissing calls in the colonies. Birds that are perching may make low-pitched moaning and clicking sounds.

Diet and Nutrition

Pelagic cormorants are carnivores (piscivores), they eat fish, crustaceans and other bottom-dwelling invertebrates, such as marine worms, algae and amphipods.

Mating Habits

MATING BEHAVIOR
REPRODUCTION SEASON
May-July
INCUBATION PERIOD
1 month
INDEPENDENT AGE
45-55 days
BABY NAME
shaglet, chick
BABY CARRYING
3-5 eggs

Pelagic cormorants are serially monogamous and pairs remain together at least for one breeding season. During the breeding season, males try to attract females by displaying at the nest site with their bill pointed up, their tail down, rapidly raising and lowering the tips of their folded wings so that the white flank patches seem to flash rapidly. Laying takes place from May to July. These birds nest as isolated pairs or in small colonies, on inaccessible sites like narrow ledges or hollows in tall, steep cliffs and rocks. Both adults make the nest, from sticks, algae, moss, grass and debris, reusing it for several subsequent years, adding new material every year. 3-5 bluish-white eggs are laid, and become stained in the nest. Incubation is for one month, shared by both adults. When hatched, the parents feed the chicks, which make short flights when they are 35-40 days old. When they are 45 and 55 days old, they leave the nest, and depend on their parents for food for several more weeks. They reach reproductive maturity at about two years old.

Population

Population threats

This widespread and numerous species has a very extensive range and so is not considered threatened. But this species is vulnerable to contaminants such as oil pollution, may drown in the gill-nets of fisheries near their feeding areas, and is also affected by increasing recreational activities which cause disturbance at nesting sites.

Population number

According to the U.S. Fish and Wildlife Service (FWS) resource, the total breeding population size of the Pelagic cormorant is 400,000 birds, about one third of which is in North America, with 43,700 individuals in 420 colonies in Alaska. The IUCN Red List records the species’ national population as follows: in China: fewer than 100 breeding pairs, with 50-1,000 wintering individuals; in Korea: 100-10,000 breeding pairs, 50-1,000 migrating individuals and 50-1,000 wintering birds; in Japan: 10,000-100,000 breeding pairs, with 1,000-10,000 migrating individuals and 1,000-10,000 wintering birds; in Russia 10,000-100,000 breeding pairs, with 1,000-10,000 birds on migration. Overall, currently Pelagic cormorants are classified as Least Concern (LC) on the IUCN Red List but their numbers today are decreasing.

Fun Facts for Kids

  • Like other smallish cormorants, the Pelagic cormorant is sometimes called the Pelagic shag.
  • The skin under the Pelagic cormorant’s eyes turns a striking magenta during the breeding season.
  • This species is one of the least social or gregarious of the cormorants.
  • These birds use their own guano to strengthen their nest materials and to fix the nest to a cliff face.
  • Pelagic cormorants are able to spring straight out of the water and into the air to fly.
  • These cormorants do not have naturally water-proof feathers and must spend time grooming and preening their feathers with oil from a gland by the base of their tail.

References

1. Pelagic Cormorant Wikipedia article - https://en.wikipedia.org/wiki/Pelagic_cormorant
2. Pelagic Cormorant on The IUCN Red List site - http://www.iucnredlist.org/details/22728950/0

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