词条 | Guadalupe Island |
释义 |
| name = Guadalupe | local_name = {{lang|gv|Isla Guadalupe}} | image_name = Guadalupe Island.jpg | image_size = 280px | image_caption = Southeast coast of Guadalupe Island | image_alt = | map = Mexico | map_caption = | location = Pacific Ocean | coordinates = {{coord|29|1|51|N|118|16|48|W|display=inline,title}} | area_km2 = 243.988 | area_footnotes = | length_km = | length_footnotes = | width_km = | width_footnotes = | coastline_km = | coastline_footnotes = | elevation_ft = 4257 | elevation_footnotes = | highest_mount = Mount Augusta | country = Mexico | country_admin_divisions_title = State | country_admin_divisions = Baja California | country_admin_divisions_title_1 = Municipality | country_admin_divisions_1 = Ensenada | country_admin_divisions_title_2 = Delegación | country_admin_divisions_2 = Ensenada | population = 213 | population_as_of = 2015 | population_footnotes = | additional_info = Official language: Spanish }}Guadalupe Island or Isla Guadalupe is a volcanic island 250 km² and located {{convert|241|km}} off the west coast of Mexico's Baja California Peninsula and some {{convert|400|km}} southwest of the city of Ensenada in the state of Baja California, in the Pacific Ocean. The two other Mexican island groups in the Pacific Ocean that are not on the continental shelf are Revillagigedo Islands and Rocas Alijos. Guadalupe Island and its islets are the westernmost region of Mexico.[1] Administration and populationThe 2010 census recorded a population of 213 people on the island.[2] Currently it has fewer than 150 permanent residents.[1] Guadalupe is part of Ensenada delegación, one of the 24 delegaciones or subdivisions of Ensenada Municipality of the Mexican state of Baja California. Ensenada delegación and Chapultepec delegación together form the city of Ensenada, the municipal seat of the namesake municipality. The postal code of Guadalupe Island is 22997. Campo Oeste ("West Camp", also called Campo Tepeyac, with 15 buildings) is a small community of abalone and lobster fishermen, located on the western coast[4], specifically on the north side of West Anchorage, a bay that provides protection from the strong winds and swells that whip the islands during winter. Generators provide electricity, and a military vessel brings 30,000 liters{{citation needed|date=October 2015}} of fresh water. The number of fishermen varies annually depending on the fishing season. Ten months of the year the 30 families of the fishing cooperative "Abuloneros and Langosteros of Guadalupe Island" are present.[2]Additional temporary fishing camps are Campo Norte ("North Camp", four buildings), Campo Lima (Campo Corrals) (one building) and Arroyitos (four buildings).[3] An abandoned fishing community, Campo Este ("East Camp"), is located near a cove on the eastern shore.{{citation needed|date=November 2014}} At the southern tip, on Melpómene Cove, there is a weather station staffed by a detachment from the Mexican Ministry of the Navy.{{when|date=November 2014}} The site is called Campamento Sur ("South Encampment").{{citation needed|date=November 2014}} Campo Bosque was established as a temporary camp in 1999 in the cypress forest in the north. The camp houses members of the Cooperative Farming Society "Francisco Javier Maytorena, S.C. of R.L." and removes goats from the island and sells them in the State of Sonora, with permission of Secretariat of the Environment and Natural Resources (SEMARNAT) and the support of the Secretariat of the Navy. Campo Pista is located at the small airport, near the center of the island ({{coord|29|01|24.04|N|118|16|21.75|W|}}, elevation:592 m, direction:05/23).[https://web.archive.org/web/20070927234407/http://www.cofemermir.gob.mx/uploadtests/5049.59.59.5.Decreto%20RB%20Isla%20Guadalupe-VF.doc] Airport Isla Guadalupe (ICAO Code MMGD) has a {{convert|1200|m|ft|adj=mid|-long}} runway. At the end of the runway near threshold 5 is the wreckage of a Lockheed Model 18 Lodestar,[4] which overshot the runway during landing. A North American B-25J-30/32 Mitchell, BMM-3501 (c/n 44-86712), bomber wrecked on the opposite end of the runway, after suffering serious damage in trying to take-off overloaded ({{coord|29|01|36.10|N|118|16|2.98|W|}}). Based on historical Google Earth imagery, this B-25 wreckage appears to have been removed from the location between October 2005 and June 2006.{{citation needed|date=November 2014}} Because Guadalupe Island is located within a biosphere reserve, anyone visiting the island must obtain a permit from the Mexican government; this means the communities on the island are closed towns.[5][6][7] GeographyGuadalupe has a rugged landscape. It consists of two ancient overlapping shield volcanoes, of which the northern and higher volcano is the younger. The island measures {{convert|35|km}} north-south and up to {{convert|9.5|km}} east-west, with a total area of {{convert|243.988|km2|sqmi|abbr=on}}. It features a chain of high volcanic mountain ridges which rises to a height of {{convert|1298|m}} at its northern end (Mount Augusta). Its smaller counterpart on the southern end is the {{convert|975|m}} El Picacho. The southern part of the island is barren, but there are fertile valleys and trees in the northern part. The coast generally consists of rocky bluffs with detached rocks fronting some of them. Two high and prominent islets are within {{convert|3|km|spell=in}} of the southwestern end of the island, separated from one another by a gap called Tuna Alley:
Elsewhere, the other islets are very small and close to the shore, all less than {{convert|1|km|spell=in}} away:
ClimateThe island has two major climate zones: a very arid, semi-hot climate between {{convert|0|and|800|m|abbr=off}} elevation, with mean annual temperature between {{convert|18|and|22|°C}} and a very arid, temperate climate above {{convert|800|m}} elevation with temperatures over {{convert|22|°C}} in the hottest month of the year. Most precipitation occurs over the winter months with strong influence of northwestern winds and cyclones. Rainfall averages {{convert|133|mm}} near sea level at the south end but appears to be much more at the high north end. An estimate for the rainfall in the northern highlands is possible by way of taking Pinus radiata as an indicator, which is native to that area of the island. Other places where Pinus radiata is native, it grows best with about {{convert|750|mm}} of rainfall but under some conditions can survive with as little as half that much. The effective moisture, of course, is much greater because of fog drip.[9] {{Weather box|location = Guadalupe Island 1951–1980 |metric first = yes |single line = yes |open = yes |Jan record high C = 27.8 |Feb record high C = 30.0 |Mar record high C = 30.0 |Apr record high C = 28.4 |May record high C = 29.5 |Jun record high C = 31.3 |Jul record high C = 31.7 |Aug record high C = 35.0 |Sep record high C = 32.2 |Oct record high C = 32.2 |Nov record high C = 30.6 |Dec record high C = 28.8 |Jan high C = 18.9 |Feb high C = 19.6 |Mar high C = 19.8 |Apr high C = 20.1 |May high C = 20.8 |Jun high C = 21.8 |Jul high C = 23.0 |Aug high C = 23.9 |Sep high C = 24.2 |Oct high C = 23.2 |Nov high C = 21.6 |Dec high C = 20.1 |year high C = 21.4 |Jan mean C = 15.5 |Feb mean C = 15.6 |Mar mean C = 15.6 |Apr mean C = 16.1 |May mean C = 16.7 |Jun mean C = 17.6 |Jul mean C = 19.0 |Aug mean C = 20.1 |Sep mean C = 20.3 |Oct mean C = 19.4 |Nov mean C = 17.9 |Dec mean C = 16.3 |year mean C = 17.5 |Jan low C = 11.8 |Feb low C = 11.6 |Mar low C = 11.6 |Apr low C = 12.0 |May low C = 12.4 |Jun low C = 13.1 |Jul low C = 14.5 |Aug low C = 15.9 |Sep low C = 16.4 |Oct low C = 15.5 |Nov low C = 13.8 |Dec low C = 12.5 |year low C = 13.4 |Jan record low C = 3.5 |Feb record low C = 3.4 |Mar record low C = 2.2 |Apr record low C = 1.0 |May record low C = 6.2 |Jun record low C = 7.6 |Jul record low C = 8.0 |Aug record low C = 8.8 |Sep record low C = 5.4 |Oct record low C = 6.2 |Nov record low C = 4.5 |Dec record low C = 0.9 |precipitation colour = green |Jan precipitation mm = 16.3 |Feb precipitation mm = 21.6 |Mar precipitation mm = 18.0 |Apr precipitation mm = 9.5 |May precipitation mm = 1.1 |Jun precipitation mm = 1.2 |Jul precipitation mm = 0.4 |Aug precipitation mm = 0.2 |Sep precipitation mm = 0.6 |Oct precipitation mm = 5.1 |Nov precipitation mm = 12.3 |Dec precipitation mm = 22.2 |year precipitation mm = 108.5 |Jan humidity = 79 |Feb humidity = 79 |Mar humidity = 78 |Apr humidity = 78 |May humidity = 79 |Jun humidity = 82 |Jul humidity = 83 |Aug humidity = 81 |Sep humidity = 81 |Oct humidity = 80 |Nov humidity = 79 |Dec humidity = 79 |year humidity = 80 |unit precipitation days = 0.1 mm |Jan precipitation days = 2.16 |Feb precipitation days = 2.00 |Mar precipitation days = 2.55 |Apr precipitation days = 1.10 |May precipitation days = 0.37 |Jun precipitation days = 0.14 |Jul precipitation days = 0.12 |Aug precipitation days = 0.07 |Sep precipitation days = 0.17 |Oct precipitation days = 0.82 |Nov precipitation days = 1.89 |Dec precipitation days = 2.32 |year precipitation days = 13.71 |source 1 = Colegio de Postgraduados[10] |date = January 2013}} GeologyGuadalupe Island is composed of two shield volcanoes which formed on a now extinct mid-ocean ridge.[11][12] They are overlain by lava flows and cinder cones that were emplaced along northwest-southeast and northeast-southwest trending fissure vents. The youngest shield volcano comprises the northern end of the island and may have formed during the Holocene epoch. A series of very fresh-looking alkali basalt flows along with trachyte domes in the northern shield volcano caldera represent the most recently formed rocks on Guadalupe Island.[12] EcologyGuadalupe Island was a major destination for Russian and American fur hunters seeking the Guadalupe fur seal (Arctocephalus townsendi) in the 18th and 19th centuries, until they were nearly extinct by 1844. Captain Auguste Duhaut-Cilly reported in 1827 that a Sandwich Islands (Hawaiian Islands) brig "had spent several months there and collected three thousand sealskins".[17] The northern elephant seal (Mirounga angustirostris) was also ruthlessly hunted for the oil in its blubber. They were thought to be extinct in 1884 until a remnant population of eight individuals was discovered on Guadalupe Island in 1892 by a Smithsonian expedition, who promptly killed seven of them for their collections.[13] The elephant seals managed to survive, and were finally protected by the Mexican government in 1922.[14] All surviving northern elephant seals share the same male ancestor.[15] Guadalupe shares the California chaparral and woodlands ecoregion with the Channel Islands of California in the United States, but the island was at one time practically denuded of all plants higher than a few centimeters by up to 100,000[16] feral goats. Originally brought there in the 19th century by European whalers and sealers for provisions when stopping over, the population eventually eliminated most vegetation; the number of goats declined to a few thousand. The main impact of the goat population was before this collapse, about the turn of the 19th/20th century. Naturalist A.W. Anthony wrote in 1901: "It is directly due to the despised Billy-goat that many interesting species of plants formerly abundant are now extinct, and also that one or more of the birds peculiar to the island has disappeared, and others are following rapidly."[22] After the crash, the goat population once again grew, this time more slowly, until it had reached the new, lower carrying capacity at maybe 10,000–20,000 in modern times. The island had been a nature conservancy area since August 16, 1928, making it one of the oldest reserves in Mexico. Eradication of the goats was long envisioned, but logistical difficulties such as island size and lack of suitable spots for landing and encamping hunters and material prevented this. In 2002, the Mexican government (including SEMARNAT) and the conservation group Grupo de Ecología y Conservación de Islas began eliminating the goats.[5] In June 2005, after many years of false starts, the Mexican government had almost completed a round-up and evacuation of the remaining goat population. In 2007, the goat elimination program ended (10,000 feral goats were eliminated).[5] Guadalupe Island was designated a biosphere reserve on April 25th, 2005.[5] French sea captain Auguste Duhaut-Cilly remarked on the tall trees on the north of Guadalupe Island as he sailed past on January 2, 1827.[17] Of the large tree species on Guadalupe Island (Guadalupe palm, Guadalupe cypress, island oak, and Guadalupe pine), there were only old individuals left; California juniper had entirely disappeared. As the goats ate any seedlings that managed to germinate, no regeneration of trees was possible. Water, formerly plentiful as the common fogs condensed in the forests of the northern end of the island, today only occurs in a few scattered pools and springs. Because the springs were a critical emergency water supply for the human inhabitants, protective measures including goat fences were installed beginning in 2000, allowing new seedlings of many species to survive for the first time in 150 years. Seacology, a non-profit environmental group located in Berkeley, CA, provided funding to the Island Conservation & Ecology Group for the construction of ten fenced exclosures to keep goats out of the most sensitive areas of Guadalupe Island. In November 1850, U.S. Army Lt. George H. Derby passed the island on his expedition in the U.S. Transport Invincible. He described it thus: "This island is about 15 miles length and 5 in width. It is rocky + mountainous but capped with vegetation and is reputed to be thickly inhabited by wild goats of unusual size. Water is found upon the eastern shore and the Island is frequently visited by small vessels engaged in the capture of the sea elephant numbers of which animals are found upon its coast." Many island or marine species that reside on or near Guadalupe also frequent the Channel Islands, and vice versa. In stark contrast to the rampant extinction of terrestrial life that happened at the same time, Guadalupe was the last refuge for the northern elephant seal (Mirounga angustirostris) and the Guadalupe fur seal (Arctocephalus townsendi) in the 1890s. The island has been a pinniped sanctuary since 1975. Guadalupe is considered one of the best spots in the world for sightings of the great white shark, possibly because of its large population of pinnipeds.[18] Habitat typesBefore the removal of goats, surveys found eight major land habitats on Guadalupe:[28][29]
A ninth habitat type, California juniper woodland and extending on the central plateau below the cypress forest, was entirely gone by 1906.[31] What other endemic lifeforms underwent coextinction with it will forever remain unknown. EndemismAnimals:
ExtinctionsNumerous taxa have gone extinct due to the habitat destruction by the goats, which in turn rendered the endemic fauna vulnerable to predation by introduced cats and to adverse weather by depriving them of shelter. There have been 5–6 extinctions of birds:
Globally extinct plant taxa from Guadalupe Island are:[28][29][30]
and one species of plant Incertae sedis Notes1. ^{{Cite web|url=https://mbgecologicalrestoration.wordpress.com/tag/hesperelaea-palmeri/|title=Hesperelaea palmeri {{!}} Natural History of Ecological Restoration|language=en|access-date=2019-02-10}} 2. ^{{cite web|url=http://www.ine.gob.mx/dgoece/con_eco/conhc/isla_guadalupe.html|title=Isla Guadalupe|publisher=Ine.gob.mx|accessdate=20 November 2014|deadurl=yes|archiveurl=https://web.archive.org/web/20070927223829/http://www.ine.gob.mx/dgoece/con_eco/conhc/isla_guadalupe.html|archivedate=27 September 2007|df=}} 3. ^{{cite web|url=http://ine.gob.mx/ueajei/publicaciones/libros/2/iguad.html|title=Instituto Nacional de Ecología|publisher=Ine.gob.mx|accessdate=20 November 2014|deadurl=yes|archiveurl=https://web.archive.org/web/20081005010255/http://www.ine.gob.mx/ueajei/publicaciones/libros/2/iguad.html|archivedate=5 October 2008|df=}} 4. ^[https://www.panoramio.com/photo/7350086 Avioneta Isla Guadalupe]. panoramio.com {{coord|29|01|09.85|N|118|16|41.03|W|}} 5. ^1 2 3 4 http://islas.org.mx/index.php?mod=proy&op=islagua Islas.org.mx. Conservación de Islas. Isla Guadalupe. Retrieved August 17, 2018. 6. ^http://sdsharkdiving.com/isla-guadalupe/ Sdsharkdiving.com/isla-guadalupe. San Diego Shark Diving. Isla Guadalupe White Shark Trip - FAQs. Retrieved August 17, 2018. 7. ^http://www.squalodivers.com/guadalupe-island-giants-fortress/ Squalo Divers. Guadalupe Island, Giant Fortress. March 27, 2017. Retrieved August 17, 2018. 8. ^1 https://www.worldatlas.com/articles/the-most-extreme-points-of-mexico.html Worldatlas.com. The Most Extreme Points of Mexico. Retrieved August 18, 2018. 9. ^Moran, Reid (1868) "The Flora of Guadalupe Island, Mexico", in [https://archive.org/details/memoirsofcalifor191996cali Memoirs of the California Academy of Sciences] 10. ^{{cite web |url=http://www.cm.colpos.mx/meteoro/progde/norm/norm24/33023.htm |archiveurl=https://archive.is/20130219041451/http://www.cm.colpos.mx/meteoro/progde/norm/norm24/33023.htm |archivedate=February 19, 2013 |title=Normales climatológicas para Isla Guadalupe, B.C. |publisher=Colegio de Postgraduados |accessdate=January 4, 2013 |deadurl=yes |df= }} 11. ^{{cite journal|author=Batiza, Rodey|title=Petrology and chemistry of Guadalupe Island: An alkalic seamount on a fossil ridge crest|journal= Geology|year=1977|volume= 5|issue= 12|pages=760–764|doi=10.1130/0091-7613(1977)5<760:PACOGI>2.0.CO;2}} 12. ^1 {{cite gvp|vn=341006|title=Guadalupe|accessdate=2017-10-16}} 13. ^{{cite book |title=The War Against the Seals: A History of the North American Seal Fishery |author=Briton Cooper Busch |page=187 |url=https://books.google.com/?id=Q4WF3PTh4kQC&pg=PA187|publisher=McGill-Queen's Press |year=1987 |isbn=978-0-7735-0610-7 }} 14. ^{{cite journal |title=Impact of a population bottleneck on symmetry and genetic diversity in the northern elephant seal |author=Hoelzel, A. R. |author2=Fleischer, R. C. |author3=Campagna, C. |author4=Le Boeuf, B. J. |author5=Alvord, G. |year=2002 |journal=Journal of Evolutionary Biology |pages=567–575 |doi=10.1046/j.1420-9101.2002.00419.x |volume=15 |issue=4}} 15. ^{{cite web |title=Northern Elephant Seal – Marine Mammal Endurance Champion |publisher=American Museum of Natural History |url=http://www.amnh.org/exhibitions/permanent/ocean/01_dioramas/h_elephantseal.php |accessdate=2011-09-05 }} 16. ^Maximum population that was reached in the late 19th century; nearly 2 goats per acre/more than 4/ha: León de la Luz et al. (2003) 17. ^1 {{cite book |title=A Voyage to California, the Sandwich Islands, and Around the World in the Years 1826–1829 |author=Auguste Duhaut-Cilly |editor=August Fruge |editor2=Neal Harlow |page=50 |year=1999 |publisher=University of California Press |location=Berkeley, California |isbn=978-0-520-21752-2 }} 18. ^https://travel.padi.com/d/guadalupe-island/ Travel.padi.com. PADI Travel. Diving in Guadalupe Island. Retrieved August 17, 2018. 19. ^Some naturalized populations exist in California 20. ^Depending whether this population belongs to Marah macrocarpus var. major or not 21. ^Depending on taxonomic status of Cedros Island population 22. ^1 2 {{cite journal|last=Anthony|first=A.W.|title=The Guadalupe Wren|journal=Condor |year=1901|volume=3|issue=3|pages=73|url=http://sora.unm.edu/node/94096|doi=10.2307/1361475}} 23. ^1 2 3 4 {{cite web|title=Plant accounts: Guadalupe Island |url=http://altamura.ucsc.edu/pls/new/ISLA2.PUBLIC_MENU.show |publisher=California/Mexico Island Conservation Database (CMICD) |accessdate=10 October 2007 |year=2007 |deadurl=yes |archiveurl=https://web.archive.org/web/20071208041336/http://altamura.ucsc.edu/pls/new/ISLA2.PUBLIC_MENU.show |archivedate=8 December 2007 |df= }} 24. ^1 {{cite web|title=Censo de Población y Vivienda 2010 |url=http://www.inegi.org.mx/sistemas/consulta_resultados/iter2010.aspx|publisher=Instituto Nacional de Estadística, Geografía e Informática (INEGI)|language=Spanish|year=2010}} 25. ^1 {{cite journal|last=Jimenez|first=Maria Luisa|last2=Aguilar|first2=Ricardo|title=Notes on the spiders of the Guadalupe and Cedros Islands, Baja California, Mexico (Arachnida, Araneae)|journal=Journal of Arachnology|year=1994|volume=22|issue=2|pages=173–175|url=http://www.americanarachnology.org/JoA_free/JoA_v22_n2/JoA_v22_p173.pdf|language=Spanish|issn=0161-8202}} 26. ^1 2 3 4 {{cite journal|last=Junak |first=S. |last2=Keitt |first2=B. |last3=Tershy |first3=B. |last4=Croll |first4=D. |last5=Sánchez |first5=J.A. |title=Recent conservation efforts and current status of the flora of Guadalupe Island, Baja California, Mexico |journal=Presentation at "Workshop on restoration and conservation of Guadalupe Island" |date=November 13–14, 2003 |url=http://www.ine.gob.mx/ueajei/publicaciones/libros/477/abstracts.html |publisher=Instituto Nacional de Ecologia |deadurl=yes |archiveurl=https://web.archive.org/web/20070819075824/http://www.ine.gob.mx/ueajei/publicaciones/libros/477/abstracts.html |archivedate=2007-08-19 |df= }} 27. ^1 {{cite journal|last=Kaeding|first=Henry B.|title=Birds from the West Coast of Lower California and Adjacent Islands (Part II)|journal=Condor|year=1905|volume=7|issue=4|pages=134–138|url=http://sora.unm.edu/sites/default/files/journals/condor/v007n05/p0134-p0138.pdf|doi=10.2307/1361667}} 28. ^1 2 3 {{cite journal|last=León de la Luz|first=José Luis|author2=Rebman, Jon P. |author3=Oberbauer, Thomas |title=On the urgency of conservation on Guadalupe Island, Mexico: is it a lost paradise?|journal=Biodiversity and Conservation|date=1 January 2003|volume=12|issue=5|pages=1073–1082|doi=10.1023/A:1022854211166}} 29. ^1 2 3 4 {{cite journal |author2=Outram Bangs|title=The Present State of the Ornis of Guadaloupe Island|journal=The Condor|date=1 May 1908|volume=10|issue=3|pages=101–106|doi=10.2307/1360977|url=http://sora.unm.edu/sites/default/files/journals/condor/v010n03/p0101-p0106.pdf|author=Thayer, John E.|authorlink=John Thayer (ornithologist)}} References{{Reflist|colwidth=30em|refs=[22][23][24][25][26][27][28][29]}} External links
7 : Islands of Ensenada Municipality|Pacific islands of Mexico|California chaparral and woodlands|Ecoregions of Mexico|Islands of Baja California|Volcanoes of Mexico|Volcanoes of the Pacific Ocean |
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