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Winter Seabirds on the Shelf Break Winter Seabirds on the Shelf Break

Winter Seabirds on the Shelf Break - PowerPoint Presentation

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Winter Seabirds on the Shelf Break - PPT Presentation

Pelagic Seabirds The term pelagic is from the Greek meaning open sea Many of the following species are pelagic in that they spend their lives at sea except when breeding Tubenoses ID: 554041

eric bowles winter species bowles eric species winter shearwater sea waters calver steve puffinus atlantic bird black jaeger land

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Slide1

Winter Seabirds on the Shelf BreakSlide2

Pelagic Seabirds

The term pelagic is from the Greek meaning “open sea”.

Many of the following species are pelagic in that they spend their lives at sea except when breeding. Slide3

Tubenoses

Shearwaters and petrels are part of a large family of birds known as tubenoses . There is a ‘nose’ on top of the bill which expels excess salt, and is extremely sensitive to smell, allowing them to sense the presence of prey being fed upon miles away.Slide4

Audubon’s Shearwater, Puffinus

iherminieri

Until the Long Bay series of cruises this species was thought to visit the South Atlantic Bight only during the warm months

Eric BowlesSlide5

Great Shearwater,

Puffinus

gravis

They are erratic visitors to our waters

.

At times there have been significant die-offs, apparently due to starvation, yet other species do well.

Eric BowlesSlide6

Great Shearwater, Puffinus

gravis

One of the few species that breeds in the Southern Hemisphere and migrates into the Northern Hemisphere, the opposite of most other shearwaters.

Eric BowlesSlide7

Cory’s Shearwater, Calonectris

diomedia

Shearwaters glide over wave tops picking up air turbulence from the wave action to help them keep aloft. They are more at home in rough seas than calm.

Russ WighSlide8

Manx Shearwater,

Puffinus

puffinus

This is ordinarily the only species of shearwater seen in winter on the South Atlantic Bight. At 13 ½ inches it is one of the smallest of it family

Eric BowlesSlide9

Manx Shearwater, Puffinus

puffinus

Notice how shearwaters have long wings to assist them in soaring just above the wave tops without expending energy

in

their constant search for prey.

Steve CalverSlide10

Black-capped Petrel,

Pterodroma

hasitata

The Black-capped Petrel is usually found only in the deeper waters east of the Gulf Stream during warm months

Steve CalverSlide11

Black-capped Petrel,

Pterodroma

hasitata

Breeds only on cliffs of the island of Dominica in the Caribbean Sea. It is now threatened because of habitat destruction.

Eric BowlesSlide12

Birds that take several years to reach sexual maturity may spend three years or more at sea, out of sight of land.Slide13

Parasitic Jaeger, Stercorarius

parasiticus

Primarily a bird of colder European waters, it follows the gull and tern migrations. It is sometimes seen from shore in winter.

Eric BowlesSlide14

Parasitic Jaeger, Stercorarius

parasiticus

The jaeger is an aggressive predator chasing other seabirds to force them to drop their catch which the jaeger then consumes.

Eric BowlesSlide15

Red Phalarope, Phalaropus

fulicaria

This small shorebird like species gathers on the shelf in flocks by the thousands each winter, typically seen about 20 miles offshore.

Eric BowlesSlide16

Razorbill,

Alca

torda

This member of the Auk family was recently thought to appear in our waters during winter only during the coldest periods in its North Atlantic waters. The winter of 2012 was one of the mildest on record. Another surprise. (Bonaparte’s Gull in the background).

Eric BowlesSlide17

The Sooty Tern is thought rarely, if ever, to rest on the ocean while at sea. It is continuously in flight.

Some albatrosses cover thousands of kilometers from the breeding grounds foraging for their young.

Seabird SecretsSlide18

Common Loon, Gavia

immer

winter (basic) plumage

The loon is a bird of small Canadian and northern lakes where it breeds and makes its haunting call. In winter they can be abundant off our Southeastern coast.

Russ WighSlide19

Common Loon, Gavia

immer

Notice how far back the legs are on this bird. The species is designed for water and walking on land is difficult. A video has been captured of a foraging loon at a depth of 90 feet.

Eric BowlesSlide20

Iceland Gull,

Larus

glaucoides

This is a juvenile bird. It is ordinarily found in Eastern Canada and New England waters. It is rare in the Southeastern U.S., but gulls commonly range far from their natal colonies after the breeding season.

Steve CalverSlide21

Northern Gannet, Morus

bassanus

The gannet dives straight into the sea from height after its prey. It can frequently be seen in winter from land on the horizon.

Eric BowlesSlide22

Group Foraging Over Fish Schools

How many species can you count in this photograph?

Steve CalverSlide23

Plumages

You have no doubt noticed that seabirds are all some shade of black, white and grey. Many of them nest in burrows on land and then spend the rest of their lives at sea where cryptic coloration is unnecessary.Slide24

Atlantic Spotted Dolphin,

Stenella

frontalis

Common on the Gulf Stream, but rarely seen near shore

Russ WighSlide25

Loggerhead Sea Turtle, Caretta

caretta

The picture continues to brighten for this species which nests on most of the island beaches on the South Atlantic coast .

Steve Calver