Exploration Ships in the Polar Seas by François-Auguste Biard
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Exploration Ships in the Polar Seas by François-Auguste Biard
Beluga Delphinapterus leucas
Observed by azure27014, CC BY-NC
Мыс Тегетхофф. Фотограф Сергеев Кирилл. Россия (Москва). Расположенный на юге острова Галля в архипелаге Земля Франца-Иосифа, мыс Тегетхофф является исторической отправной точкой для всего этого полярного региона.
Cape Tegethoff. Photographer Kirill Sergeev. Russia (Moscow). Located in the south of the island of Galle in the Franz Josef Land archipelago, Cape Tegethoff is a historical starting point for this entire polar region.
Источник: //35photo.ru/photo_13015547/.
Arctic Drive Field Notes #4
Or: we finally touch the Arctic Ocean. (Yes, that's ice on the horizon! It was actually much closer to the shoreline a couple of weeks ago, so its seasonal recession is pretty recent. The leads are well and truly open, boys.)
There are lots of roads, buildings, and topographic features in this part of the world named for a certain flavor of 19th-century Arctic explorer, as you can see. In the Northwest Territories, when things carry fragments of the name Franklin, they tend to be referencing the Man-Who-Ate-His-Boots era. (You know, his first terrible expedition.)
I'm fine getting into that, but in this entry I really want to talk about the indigenous peoples who live and work in and sustain these communities, because one has to.
Inktober Day 19 • Arctic
Icebreaker
A colony of walruses pop up from the icy waters of the Arctic Ocean in Svalbard, Norway
Photograph: Michael Oliver/Animal News Agency
Settle in with a Sea Angel
Better known as the naked sea butterfly or the common clione, Clione limacina is a species of pelagic sea slug (aka sea angels or gimnosomates) found throughout the open water of the north Atlantic, north Pacific and Arctic Oceans. They reside in both the epipelagic and mesopelagic regions, from the surface to depths of over 500 m (1,600 ft). As extremophiles, they can withstand extremely cold temperatures of −0.5 to 3°C (32°F to 37°F).
The common clione is named for its wing-like fins, which propel it through the water. The body is otherwise quite simple in design, and completely transluscent save for the organs, which are a vibrant orange. C. limacina is also notable for being the largest sea angel; the northernmost populations can reach 7–8.5 cm (2.8–3.3 in) in length.
Though they look beautiful the naked sea butterfly is actually a voracious predator. They primary prey are tiny, shelled sea butterflies. When it encounters a target, the sea angel's 'head' opens and it extracts the butterfly from its shell using a set of tentacles and chitinous hooks. When it cannot find sea butterflies, C. limacina will also consume small amphipods copepods. However, they can also survive up to a year without food of any kind. In turn, common cliones are also prey for a variety of marine life including fish such as chum salmon, and baleen whales.
Though little is known about the reproductive habits of C. limacina, research suggests that they are simultaneous hermaphrodites; individuals contain the sex organs for both males and females. They mating peaks during the spring and summer, and lay about 30-40 eggs afterwards. The larvae stay in the top 200 m (650 ft) of the water column to feed on phytoplankton until they reach maturity. It is generally thought that they can live to be about two years old in the wild.
Conservation status: Clione limacina has not been evaluated by the IUCN; however, like most sea slugs, they have a large population and are not considered to be endangered. However, they may be threatened by the rising temperatures in their natural habitat.
Photos
Kevin Raskoff
Richard Satterlie
Andrey Narchuk
File:Sea Ice (39836840331).jpg