Leach's Storm Petrel



The Leach's Storm Petrel or Leach's Petrel (Oceanodroma leucorhoa) is a small seabird  of the  tubenose  family. It is named after the British zoologist William Elford Leach.

It breeds on inaccessible islands in the colder northern areas of the Atlantic  and  Pacific. It nests in colonies close to the sea in well concealed areas such as rock crevices, shallow burrows or even logs. It lays a single white egg which often has a faint ring of spots at the large end. This storm-petrel  is strictly  nocturnal  at the breeding sites to avoid  predation  by  gulls  and  skuas, and will even avoid coming to land on clear moonlit nights. The largest colony of Leach's Storm Petrels can be found on Baccalieu Island  of eastern  Canada, an ecological reserve with more than 3 million pairs

Description of the bird.| [2]
The Leach's Petrel, known in some rural areas as Carrie Chicks, is a small bird at 18–21 cm in length with a 43–48 cm wingspan. Like many other Storm-petrels, it has all-dark plumage  and usually a white rump. However, dark-rumped individuals exist on the west coast of North America; they are very rare north of southern California, but the percentage increases suddenly on the United States-Mexico border where 90-100% of breeding birds are dark-rumped.| [3] In Europe, it can be readily distinguished from the  European Storm Petrel  and the  Wilson's Storm Petrel  by its larger size, forked tail, different rump pattern and flight behavior. Identification in the Americas, however, proves more difficult. On the Atlantic Coast it is very hard to separate this species from Band-rumped Storm Petrels ; identification involves characteristics such as the extent of white on the rump and flight pattern. Discerning this species from others is arguably hardest on the Pacific Coast, where the dark-rumped from can be confused with at least three other all-dark Storm-petrel species. Here, identification involves close attention to wingbeats and overall color. It has a fluttering flight, and patters on the water as it picks planktonic  food items from the ocean surface. Like most petrels, its walking ability is limited to a short shuffle to the burrow. One interesting aspect of the bird is that contrary to most species, this bird gains telomere  growth as they grow older. Telomere shortening in cell division  limits the maximum lifespan of most other species. The lifespan of the Leach's Petrel is therefore theoretically limitless. This is a matter of debate, however. Studies have shown that while the telomere growth may have contributed to the eldest of specimens, young specimens exhibit telomeres that are longer, and shorten over time. The Leach's Petrel lifespan may be inconclusive, but there is no data to support the hypothesis that this species is possibly immortal.

Distribution and habitat
It is strictly pelagic outside the breeding season, and this, together with its remote breeding sites, makes Leach's Petrel a difficult bird to see from land. Only in storms  might this species be pushed into headlands. Unlike Storm-petrel, it does not follow ships. In Europe, the best chance of seeing this species is in September in Liverpool Bay  between north  Wales  and  England. Strong north-westerlies funnel migrating  Leach's Petrels into this bay. British ornithologists Robert Atkinson and John Ainslie observed the communities of Leach's Petrel on the remote Scottish islands of North Rona  between the 16 July and 12 August 1936, and on  Sula Sgeir  between the 3 and 4 August 1939.

edit ] Ecology
Lifespan for this bird is unusually long for a bird of such rather small size, with an average of 20 years and a maximum recorded lifespan of 36 years. In 2003, Haussmann et al. | [4] found that the bird's  telomeres  lengthen with age, the only known example to date of such a phenomenon. It is rather likely, however, that this phenomenon also occurs in other members of the Procellariiformes, which all have a rather long lifespan compared to their size.

They feed primarily on plankton, including euphausiids, copeopods, and a form of amphipod that are parasitic to jellyfish gonadal pouches. They also feed to a large extent on myctophids (lantern fish) which only occur at the surface at night in water over the continental slope. Individuals have been observed to feed at distances up to 300 km from any known breeding colony. Breeding individuals store energy rich lipids in a sac anterior to their stomach which are used to either sustain themselves while incubating their single egg, to feed their chick, or can also be used as a defensive mechanism when caught by a predator as do many other Procellariformes. There is evidence showing that parents feed their chicks different prey species then they consume themselves. Chicks grow to a prefledging weight almost double of that when they actually fledge from the burrow in late September. Fall storms can cause these young fledging individuals to wreck on the mainland.