View source for Laysan

{{short description|Atoll of Hawaii}}
{{Infobox Islands
| name              = Laysan
| native_name       = ''Kauō''
| map               = USA Hawaiian Islands#Pacific Ocean
| native_name_link  = 
| sobriquet         = 
| image_name        = File:Laysan Aerial.jpg
| image_caption     = Aerial view of Laysan from the north
| image_size        = 280px
| image_map         = File:Hawaiianislandchain USGS.png
| image_map_caption = Map of the [[Hawaiian Islands]] showing the location of Laysan, in the middle of the northwestern chain
| location          = Pacific Ocean
| coordinates       = {{Wikidatacoord|Q34720|region:US-HI_type:isle|display=inline,title}}
| archipelago       = [[Northwestern Hawaiian Islands]]
| country           = [[United States]]
| country_admin_divisions_title    = State
| country_admin_divisions          = [[Hawaii]]
| country_admin_divisions_title_1  = 
| country_admin_divisions_title_2  = County
| country_admin_divisions_2        = [[Honolulu County, Hawaii|Honolulu]]
| area_acre         = 1016
| rank              = 
| length_mi         = 1.5
| width_mi          = 1
| coastline_mi      = 
| highest_mount     = 
| demonym           = 
| population        = 0
| population_as_of  = 
| density_km2       = 
| ethnic_groups     = 
| website           = 
}}

'''Laysan''' ({{IPAc-en|ˈ|l|aɪ|s|ɑː|n}};<ref>{{Cite Merriam-Webster|Laysan|access-date=March 23, 2019 }}</ref> {{langx|haw|italics=no|'''Kauō'''}} {{IPA|haw|kɐwˈoː|}}) is one of the [[Northwestern Hawaiian Islands]], located {{convert|808|nmi|mi km|0|lk=on}} northwest of [[Honolulu]]. It has one land mass of {{convert|1016|acre}}, about {{convert|1|by|1+1/2|mi|km|lk=on|abbr=out}} in size. It is an [[atoll]] of sorts, although the land completely surrounds [[Laysan Lake]], some {{cvt|2.4|m|ft}} [[above sea level]], that has a [[salinity]] approximately three times greater than the ocean. Laysan's Hawaiian name, ''Kauō'', means "egg".

It was mined for guano in the late 19th century and early 1900s, which resulted in the release of rabbits who had been brought in for food. After mining ceased, the rabbits ate up the natural vegetation causing dozens of plant and one bird species to go extinct. The rabbits were removed by 1923, and the island has been a nature reserve since.  
The island is the home of the rarest duck in the world, the [[Laysan Duck]].

==Geology==
[[File:laysan map lrg.gif|thumb|left|[[Bathymetric chart|Bathymetric map]] of Laysan]]
Laysan is the second largest single landmass in the Northwestern Hawaiian Islands, after Sand Island at [[Midway Atoll]]. Laysan was created by coral growth and geologic upshift.<ref>{{Citation |title=Introduction: The Northwestern Hawaiian Islands |date=December 31, 2017 |url=http://dx.doi.org/10.1515/9780824846268-003 |work=Isles of Refuge |pages=1–6 |publisher=University of Hawaii Press |doi=10.1515/9780824846268-003 |isbn=978-0-8248-4626-8 |access-date=December 2, 2020 |url-access=subscription }}</ref> The [[fringing reef]]s surrounding the island cover about {{convert|735|acre}}. The tallest point on the island is {{convert|50|ft|m|0}} above sea level, on a large dune that covers much of the northern portion of the island.{{cn|date=March 2023}}

Lake Laysan, a {{convert|100|acre|adj=on}}, brown, [[hypersaline]] lake in the island's interior, has varied in depth over the decades. In the 1860s, the lake was at most {{convert|30|ft|m|0}} deep, but by the 1920s it averaged only {{convert|3|-|5|ft|m|0}} in depth, because of the build-up of sand that had been blown into it by [[dust storm|sandstorms]]. The best way to find fresh water on Laysan is to observe where the [[Laysan finch|finches]] are drinking, because fresh water floats on the saltier water and accumulates around the shore. 

A [[U.S. Geological Survey]] study found that Laysan, Midway Atoll, and Pacific islands like them, could become inundated and unfit to live on during the 21st century.<ref>"[http://www.scientificamerican.com/article.cfm?id=storm-surges-rising-seas-could-doom-pacific-islands-this-century ''Storm Surges, Rising Seas Could Doom Pacific Islands This Century''] {{Webarchive|url=https://web.archive.org/web/20130414225907/http://www.scientificamerican.com/article.cfm?id=storm-surges-rising-seas-could-doom-pacific-islands-this-century |date=2013-04-14 }}: Atolls and other low-lying islands in the Pacific Ocean may not slip under the waves but they will likely become uninhabitable due to overwashing waves" [[ClimateWire]] and [[Scientific American]] April 12, 2013</ref><ref>{{cite web |title=Forecasting the Impact of Storm Waves and SeaLevel Rise on Midway Atoll and Laysan Island within the Papahānaumokuākea Marine National Monument—A Comparison of Passive Versus Dynamic Inundation Models |work=Open-File Report 2013–1069 |url=https://pubs.usgs.gov/of/2013/1069/of2013-1069.pdf |access-date=2020-02-24 |archive-date=2017-11-15 |archive-url=https://web.archive.org/web/20171115041423/https://pubs.usgs.gov/of/2013/1069/of2013-1069.pdf |url-status=live }}</ref>

[[File:laysan beach.jpg|thumb|upright|[[Monk seal]] on the beach at Laysan. Note ripple pattern in coral sand, June 1969]]
[[File:Starr 990604-0969 Cyperus laevigatus.jpg|thumb|The shore of Lake Laysan]]

==History==
===Discovery and early expeditions===
[[Native Hawaiians]] may have known about Kauō before Americans and Europeans sailed their ships into the region in the early 19th century (see below). The first reported sightings of the island were by [[Massachusetts]]-based [[whaling|whalers]] in the 1820s. ''The Nantucket Enquirer'' reported a sighting in 1825,<ref>''The Daily National Journal'' (citing an article in ''The Nantucket Enquirer''), issue of March 7, 1825.</ref> which is probably the first reference to the name "Laysan" in print. The whalers were among many who took advantage of the newly discovered whaling grounds off the coast of [[Japan]], making the waters around the Northwest Hawaiian archipelago an increasingly popular commercial route.

A United States government survey of Pacific Ocean geography in 1828 included the earlier whalers' reports, as well as a sighting of an island fitting Laysan's description by a Captain "Brigs".<ref>Jeremiah N. Reynolds, ''Address on the subject of a surveying and exploring expedition to the Pacific Ocean and South Seas: Delivered in the Hall of Representatives on the evening of April 3, 1836'' (New York:1836), pp. 201 & 223.</ref> That might refer to Captain John Briggs of [[New Bedford]], who could have come across the island as early as 1822.<ref>In ''The New Bedford Mercury'', February 21, 1823, p. 3, the ship ''Persia'' reports sighting Briggs' ship ''Wilmington & Liverpool Packet'' northwest of Midway Island.</ref> Various publications name Captain Stanyukovich, of the [[Russia]]n ship ''Moller'', as the discoverer of Laysan. Although he mapped the island in 1828, and attempted to name it for his ship, he was clearly there after the [[New England]]ers, at least.{{cn|date=March 2023}}

In 1857, Captain John Paty, of the ''Manuokawai'', annexed Laysan to the [[Kingdom of Hawaii|Kingdom of Hawai{{okina}}i]].

The island had an economic value due to the presence of [[guano]]. In 1859, Captain Brooks, of the ship ''Gambia'', traveled to the island and wrote that there was guano there, but "not of sufficient quantity to warrant any attempts to get it".<ref>Rauzon 2001, pg.101.</ref> Despite that, in 1890, George D. Freeth and Charles N. Spencer successfully petitioned the Kingdom of Hawai{{okina}}i for permission to mine guano on Laysan and agreed to make royalty payments to the Kingdom. Around {{convert|100|ST|MT}}<!-- Originally, this stated tons, but that unit is ambiguous. I'm guessing it referred to short tons, as that was a weight unit adopted by the United States in the 19th century. --> were extracted per day.<ref name=Rauzon_2001_104/> Given that, towards the end of the guano mining era, [[iron-hulled sailing ship]]s had a capacity of {{convert|5000|ST|MT}}, Laysan produced a shipload every two months.{{cn|date=March 2023}}

Working conditions at the guano mine were grueling. In August 1900, [[Japan]]ese workers mutinied against the American management. The [[strike action]] turned to violence because of a [[language barrier]]. As a result, there were two deaths and two injuries.{{Citation needed|date=October 2021}}

The publicity about Laysan attracted scientists and, in the next decade, many of the island's unique species were scientifically examined for the first time.<ref name="Rauzon_2001_104">Rauzon 2001, p.104.</ref> However, the guano mining affected the island's ecosystem dramatically. Professor [[William Alanson Bryan]] of the [[Bernice P. Bishop Museum]] estimated that there were 10 million seabirds on Laysan in 1903 but, eight years later, the estimate was that there were little more than a million. In those eight years, the ''[[Pritchardia]]'' [[Laysan fan palm|palms]] that were unique to Laysan, and the island's sandalwood trees (''[[Santalum ellipticum]]''), both became extinct.

1894 marked the arrival of Laysan's most notorious inhabitant, [[German Empire|German]] immigrant [[Max Schlemmer]], who was the superintendent of the guano mining operation. He released [[domestic rabbit]]s, [[Belgian hare]]s, English hares and [[guinea pigs]] on the island, expecting them to multiply and provide supplies for a future meat-canning business. That had a disastrous effect on Laysan's indigenous flora and fauna.<ref>{{Cite journal |url=https://books.google.com/books?id=wa4tAAAAYAAJ |journal=Biological Survey - Bulletin No.42 |title=Report of an expedition to Laysan Island in 1911: under the joint auspices of the United States Department of Agriculture and University of Iowa |first=Homer Ray |last=Dill |author2=William Alanson Bryan |publisher=[[United States Department of Agriculture]] |year=1912 |page=9 }}</ref> <!-- I'm not quite sure what kind of animals were introduced to the island. Belgian Hares are a type of domestic rabbit, so English Hares could also be a domestic rabbit breed. It's usually stated that only rabbits were on Laysan, so that would make sense.-->

===Period of extinction===
[[File:Laysan island.jpg|thumb|Laysan Island, 2013]]
The [[rabbit]]s reproduced rapidly, and their appetite soon far exceeded the available vegetation on the island. Complaints about that, and about [[Japan]]ese [[poaching|poachers]] of the bird population, led President [[Theodore Roosevelt]] to declare the Northwestern Hawaiian chain a bird sanctuary in 1909. Schlemmer continued to allow the Japanese to export bird wings illegally and so was removed from the island. However, without plant cover, much of the soil and sand became loose and blew about in dust storms. By 1918, the rabbits had eaten so much that the remaining vegetation was only enough to sustain 100 of them. Twenty-six plant species had been eradicated, and the [[Laysan millerbird]] had become extinct.<ref>Rauzon 2001, p.110</ref>

In 1923, the [[Tanager Expedition]] arrived and achieved its aim of exterminating the last rabbits. The bird population had been reduced to about a tenth of its former size. Three [[endemic]] taxa had become [[extinct]], as had numerous other plant species. Two other endemic species, the [[Laysan duck]] and the [[Laysan finch]], still survive, but are [[endangered]].

===Recent history===
[[File:Beach strewn with plastic debris (8080500982).jpg|thumb|left|Marine debris washed up on Laysan]]
Like most of the Northwestern Hawaiian islands, Laysan is currently uninhabited. It is protected by the [[Hawaiian Natural Life Act of 1961]] and is under the stewardship of the [[United States Fish and Wildlife Service|U.S. Fish and Wildlife Service]], who have had success in eliminating pests, restoring the island's vegetation, and boosting the populations of species considered endangered.{{cn|date=March 2023}}

Garbage from passing ships often washes ashore on Laysan. That poses a danger to birds because they can swallow [[plastic waste]], which remains undigested and crowds their stomachs, leaving no room for their normal food. According to observations in her 2006 mission log, Patricia Greene, a NOAA Teacher-at-Sea, found that most of the plastic was of Japanese origin.<ref>Greene 2006.</ref> Additionally, in the 1990s, biologists found that a container of poisonous [[carbofuran]] had floated ashore and burst open above the [[high tide]] line, creating a "dead zone" in which any living thing was killed.<ref>Rauzon 2001, p.126-127.</ref>

====Sandbur eradication====
[[File:Starr 990604-0963 Sicyos maximowiczii.jpg|thumb|Inland on Laysan ''[[Sicyos|Sicyos maximowiczii]]'', 1999]]
[[File:Starr-990604-0972-Cyperus laevigatus-with Laysan ducks-By lagoon-Laysan Island (23899303624).jpg|thumb|Laysan ducks by the island's lake]]
In 1991, the [[United States Fish and Wildlife Service]] began an effort to eradicate [[sandbur]], an alien grass, which was first introduced in the 1960s by US Armed Forces personnel. Sandbur crowds out the native [[bunchgrass]], which is habitat for birds.<ref>Rauzon 2001, p.120.</ref> At a cost of almost one million dollars, the sandbur had been almost was completely removed by 2000. With that threat gone, the USFWS hoped to restore Laysan to its condition prior to [[Europe]]an discovery.

To replace the native ''Pritchardia'' palms that had become extinct, the FWS wanted to bring in ''[[Pritchardia remota]]'' from [[Nīhoa]], a similar species to Laysan's [[Laysan fan palm|lost fan palm]]. The next step was to be introducing [[Nīhoa millerbird]]s, to replace the extinct Laysan millerbirds that are closely related. Those transfers were to accomplish a two-fold goal: to restore Laysan to an ecology similar to its pre-industrial one, and to protect those two species from extinction by maintaining a second population on Laysan. That way, if diseases, fires, or hurricanes obliterate the Nīhoa population, the population can be revived by translocation from Laysan.<ref>Rauzon 2001, p.122.</ref>

===="Laysan fever"====
In 1991, several workers on Laysan contracted a feverish illness previously unknown there or anywhere else. It affected workers on Laysan in varying levels of severity: one woman was evacuated for persistent fever, but others exhibited very mild symptoms. Cedric Yoshimoto, of the [[University of Hawaii at Manoa|University of Hawai{{okina}}i at Mānoa]] School of Public Health, wrote that "surveillance has identified a newly-described illness of humans termed 'Laysan fever (LF)' It is associated with bites of the seabird tick ''[[Ornithodoros|Ornithodoros capensis]]''... <nowiki>[and]</nowiki> joins a short list of human illnesses associated with seabird colonies..."<ref>Rauzon 2001, p.123.</ref> The symptoms of [[Q fever]] overlap significantly with those of Laysan fever, and scientists have speculated as to their possible common causes.<ref>Rauzon 2001, p.125.</ref>

==Possible ancient Hawaiian presence==
In 2003, an [[archaeology|archaeologist]] examining [[sediment]] cores found pollen from [[coconut]] palms deep below the bottom of the central lagoon. That unexpected find raised several questions. Before that, no evidence existed that the coconut ever reached any of the [[Hawaiian Islands]] before the arrival of the [[Polynesia]]n voyagers. Further, there has never been any physical evidence that the ancient Hawaiians extended their exploration of the Hawaiian chain beyond [[Nīhoa]] and [[Necker Island (Northwestern Hawaiian Islands)|Mokumanamana]] (Necker). Dating the sediment containing the ''Cocos'' pollen is imprecise, but appears to have been deposited some time between 5,500 years ago and the arrival of Europeans in Hawaiian waters in the late 18th century. The full length of the core was {{convert|70|ft|m}} and is thought to represent a record spanning 7,000 years. Coconut pollen was not found in the deeper (older) part of the core. However, cores from [[Guam]] in the western [[Pacific Ocean|Pacific]] show the presence of coconut trees there as early as 9,000 years ago, well before human habitation. Hawaiian traditions suggest that the Hawaiians were aware that islands existed to the north-west, and the pollen evidence could be interpreted as proof of early Hawaiian visits to Laysan. More precise dating of the sediment layers will be needed to better interpret the find.<ref>TenBruggencate 2005</ref>

==Distinctive species of Laysan==
[[File:Laysan duck and ducklings.jpg|thumb|A Laysan duck mother and her ducklings]]
[[File:LaysanFanPalm.png|thumb|Two living [[Laysan fan palm]]s and the stumps of others. Photographed sometime between 1891 and 1896.]]
[[File:Laysan Island Interior.jpg|thumb|The interior of Laysan, showing its lake and the birds that nest there]]
Laysan is generally regarded as the "gem" of the [[Northwestern Hawaiian Islands|NWHI]], with the most biodiversity. It is home to the [[Laysan duck]], the rarest duck in the world.<ref>Liittschwager 2005, p.131.</ref> The other native land bird of Laysan is the [[Laysan finch]], an opportunistic hunter. Eighteen other bird species nest there and use Lake Laysan, the only lake in the NWHI, as a rest stop or breeding ground. Laysan also has its share of native plants, many of which, such as ''[[Eragrostis variabilis]]'', were extirpated from Laysan during its "extinction period" and then reintroduced from other leeward islands by scientists.<ref>Liittschwager 2005, p.128.</ref> Like most other of the NWHI, Laysan is home to [[Hawaiian monk seal]]s and [[green sea turtle]]s.

===Birds===
* [[Laysan finch]], ''Telespiza cantans'' – '''endemic'''
* [[Laysan duck]], ''Anas laysanensis'' – '''endemic'''
* [[Laysan albatross]], ''Phoebastria immutabilis'' – '''nearly endemic'''
* [[Black-footed albatross]], '' Phoebastria nigripes''
* [[Short-tailed albatross]], ''Phoebastria albatrus''
* [[Great frigatebird]], ''Fregata minor''
* [[Lesser frigatebird]], ''Fregata ariel''
* [[White tern]] (or "fairy tern"), ''Gygis alba''
* [[Sooty tern]], ''Onychoprion fuscatus''
* [[Spectacled tern]], ''Onychoprion lunata''
* [[Bristle-thighed curlew]], ''Numenius tahitiensis''
* [[Pacific golden plover]], ''Pluvialis fulva''
* [[Christmas shearwater]], ''Puffinus nativitatis''
* [[Red-tailed tropicbird]], ''Phaethon rubricauda rothschildi''
* [[Brown noddy]], ''Anous stolidus''
* [[Black noddy]], ''Anous minutus melangogenys''
* [[Masked booby]], ''Sula dactylatra''
* [[Brown booby]], ''Sula leucogaster''
* [[Red-footed booby]], ''Sula sula rubripes''
* [[Bonin petrel]], ''Pterodroma hypoleuca''
* [[Laysan rail]], ''Porzana palmeri'' – '''extinct''', '''endemic'''
* [[Laysan honeycreeper]] ''Himatione fraithii'' – '''extinct''', '''endemic'''
* [[Laysan millerbird]], ''Acrocephalus familiaris familiaris'' – '''extinct''', '''endemic'''

===Invertebrates===
* Laysan dropseed noctuid moth, (''[[Hypena laysanensis]]'') – '''extinct'''
* Laysan noctuid moth, (''[[Agrotis laysanensis]]'') – '''endemic'''
* Procellaris agrotis noctuid moth, (''[[Agrotis procellaris]]'') – '''endemic'''
* Laysan weevil, (''[[Oedemasylus laysanensis]]'') – '''extinct'''
* Bryan’s Kauō weevil, (''[[Rhyncogonus bryani]]'') – '''endemic and extinct'''
* Bryan’s northwestern hawaiian snail, (''[[Tornatellides bryani]]'') – '''also present on Lisianski and Midway, extant'''

==See also==
{{Portal|Islands}}
* [[Desert island]]
* [[List of islands]]

==Notes==
{{reflist|2}}

==References==
<!--WilsonBull28:153 [note species name is wrong and species is unidentifiable]-->
* TenBruggencate, J. 2005. [http://the.honoluluadvertiser.com/article/2005/May/23/ln/ln08p.html "Coconut pollen found on Laysan"]. ''Honolulu Advertiser'', Monday, May 23, 2005, p. B1-2.
* Rauzon, Mark J. (2001), Isles of Refuge: Wildlife and History of the Northwestern Hawaiian Islands, University of Hawaii Press, {{ISBN|0-8248-2209-9}}.
* Greene, Patricia (2006). {{usurped|1=[https://web.archive.org/web/20120207161549/http://www.hawaiianatolls.org/research/June2006/albatross_death.php "Death of a Laysan Albatross Chick."]}}. Also available at [https://sanctuaries.noaa.gov/missions/2006nwhi/log_070606.html "Mission Log: July 6, 2006: Death of a Laysan Albatross Chick"]
* Liittschwager, David & Middleton, Susan (2005), Archipelago: Portraits of Life in the World's Most Remote Sanctuary, National Geographic, {{ISBN|0-7922-4188-6}}.

==External links==
{{Commons category}}
* [http://dougsinclairsarchives.com/briggs/laysan.htm Laysan Island: Confused History]
* [https://web.archive.org/web/20070518190231/http://hawaiireef.noaa.gov/about/laysan.html Ecological description of Laysan]
* [http://www.janeresture.com/laysan/ History of Laysan] {{Webarchive|url=https://web.archive.org/web/20120716232443/http://www.janeresture.com/laysan/ |date=2012-07-16 }}
* [https://www.pbs.org/kqed/oceanadventures/episodes/kure/diaries/laysan.html Quick Facts on Laysan Island from the PBS Ocean Adventures site]
* [https://web.archive.org/web/20110903082931/http://pmnmims.org/ Papahānaumokuākea Marine National Monument Information Management System]
* [https://www.google.com/intl/en_ALL/streetview/#remote-islands-of-the-world/laysan-island Google Street View July 2013]
* [https://mnh.uiowa.edu/exhibits/laysan-island-cyclorama Laysan Island Cyclorama at the University of Iowa]

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