Biomization and quantitative climate reconstruction techniques in northwestern Mexico—With an application to four Holocene pollen sequences

Ortega‐Rosas, Carmen Isela; Guiot, Joël; Peñalba, M. Cristina; Ortiz-Acosta, M. E.

doi:10.1016/j.gloplacha.2007.10.006

Cited by 24 publications

(30 citation statements)

References 105 publications

(149 reference statements)

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“…Tropical coniferous forests covered a larger region in western North America during the mH than nowadays (e.g. the Madrean mountains of north‐west Mexico), as shown by biome reconstruction (Ortega‐Rosas et al ., ). Similarly, tropical areas like the high Andes páramo vegetation in equatorial South America were at least 300 m higher in altitude during the warm period of the mH than at present (Niemann & Behling, ; Niemann et al ., ).…”

Section: Discussionmentioning

confidence: 97%

Assessing global biome exposure to climate change through the Holocene–Anthropocene transition

Benito-Garzón

Leadley

Fernández-Manjarrés

2013

Global Ecology and Biogeography

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AimTo analyse global patterns of climate during the mid-Holocene and conduct comparisons with pre-industrial and projected future climates. In particular, to assess the exposure of terrestrial biomes and ecoregions to climate-related risks during the Holocene-Anthropocene transition starting at the pre-industrial period.Location Terrestrial ecosystems of the Earth. MethodsWe calculated long-term climate differences (anomalies) between the mid-Holocene (6 ka cal bp, mH), pre-industrial conditions and projections for 2100 (middle-strength A1B scenario) using six global circulation models available for all periods. Climate differences were synthesized with multivariate statistics and average principal component loadings of temperature and precipitation differences (an estimate of climate-related risks) were calculated on 14 biomes and 766 ecoregions. ResultsOur results suggest that most of the Earth's biomes will probably undergo changes beyond the mH recorded levels of community turnover and range shifts because the magnitude of climate anomalies expected in the future are greater than observed during the mH. A few biomes, like the remnants of North American and Euro-Asian prairies, may experience only slightly greater degrees of climate change in the future as compared with the mH. In addition to recent studies that have identified equatorial regions as the most sensitive to future climate change, we find that boreal forest, tundra and vegetation of the Equatorial Andes could be at greatest risk, since these regions will be exposed to future climates that are well outside natural climate variation during the Holocene. ConclusionsThe Holocene-Anthropocene climate transition, even for a middlestrength future climate change scenario, appears to be of greater magnitude and different from that between the mH and the pre-industrial period. As a consequence, community-and biome-level changes due to of expected climate change may be different in the future from those observed during the mH.

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Section: Discussionmentioning

confidence: 97%

Assessing global biome exposure to climate change through the Holocene–Anthropocene transition

Benito-Garzón

Leadley

Fernández-Manjarrés

2013

Global Ecology and Biogeography

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“…At 12 ka, drier conditions were found in the north of Baja California that may reflect the YD, when lakes disappeared and dust accumulation began (Ortega et al ., 1999). In Babicora Lagoon (northwestern Mexico), dry conditions with low lake levels were reconstructed, as well as changes in vegetation from 12.8 to 11.6 ka (Ortega‐Rosas et al ., 2008). In Core JPC20, we observe a change from coarser to finer material (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…8A) (Antinao et al ., 2016; Roy et al ., 2010). Between 10 and 7 ka, drier conditions have been reconstructed in lakes from the southwestern United States and wind deposits of Baja California, where the orientation of field dunes was modified by changes in the atmospheric circulation (Ortega‐Rosas et al ., 2008; Ortega et al ., 1999). During the mid‐Holocene, northwesterly winds became stronger as the North Pacific High extended to its current position (Barron et al ., 2014; McClymont et al ., 2012).…”

Section: Resultsmentioning

confidence: 99%

Comparisons between marine productivity and terrestrial input records in the Gulf of California over the last 28 ka

Arellano‐Torres

Mora‐Rivera

Vázquez‐Romero

et al. 2020

J Quaternary Science

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We study the marine and terrestrial contributions in the Gulf of California (GC) to understand the relationship between continental climate and oceanographic variability over the last 28 ka. In Core AII125‐8‐JPC‐20, we examine aeolian and riverine inputs as nutrients for biological productivity. We use biogenic silica (%opal), total organic carbon (%TOC) and calcium carbonate (%CaCO3) as proxies for primary productivity, and lithic fraction distributions as proxies for terrigenous transport. At the core site, biogenic and lithic components are in phase at millennial‐scale in response to regional climate conditions. During the Late Pleistocene, the GC shelf area was above sea level and the western margin showed transient episodes of increased fluvial inputs. Episodic increases in %opal and reduced %TOC suggest upwelling events but ineffective C‐export to the sediment. During stadial events (Heinrich 2, Heinrich 1, Younger Dryas), regional declines in %opal, but increases in %CaCO3 and TOC, suggest efficient C‐export by carbonate organisms. During most of the Holocene, dust inputs are higher. Episodic increases in %TOC suggest higher C‐accumulation, although this is not controlled by siliceous or calcareous organisms. In the GC, besides upwelling and current advection, nutrient inputs driven by terrestrial climate have an impact on the biological C‐pump. © 2020 John Wiley & Sons, Ltd.

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“…Fossil pollen records from northwestern Mexico indicate that climate variability was high during the late Holocene, and the rapid response of vegetation to paleoenvironmental change is evident (Ortegas-Rosas et al 2008). Unfortunately, conditions in the vicinity of San Quintín do not appear to have been suitable for pack-rat midden preservation or lake sediments so there is a paucity of data on historical climate and vegetation in NW Baja California specifically.…”

Section: Physical Settingmentioning

confidence: 99%

The Flora of Greater San Quintín, Baja California, Mexico (2005–2010)

Vanderplank¹

2011

aliso

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The plants of San Quintín (Baja California, Mexico) were documented through intensive fieldwork and collection of herbarium specimens to create a checklist of species. The region is located near the southernmost extent of the California Floristic Province, and the flora is influenced by the adjacent desert to the south. A total of 435 plant taxa were documented, of which 82% are native plants. Almost one in three native plant taxa in Greater San Quintín is a sensitive species, here documented as rare and/or locally endemic, and many taxa have yet to be evaluated fully for rarity and threats. Four major habitats were identified, and a checklist is presented for each. Shell middens and vernal pools represent micro-habitats with unique species that also warrant conservation consideration. All habitats in Greater San Quintín are threatened by human activity, and agricultural water use practices are unsustainable. There is a pressing need for conservation of the natural areas that remain in this unique but heavily impacted region. The El Socorro Dunes and the volcanic bay are of particular conservation value with several narrowly endemic taxa. As a transitional area in a global biodiversity hotspot, Greater San Quintín is home to many species on the edge of their ranges and may be of critical importance to biodiversity conservation in a changing climate. RESUMENSe documentó la presencia de las plantas que se encuentran en San Quintín (Baja California, México) a través de trabajo de campo intensivo y la colecta de especímenes de herbario, con el objeto de generar un listado de especies de la zona. La regió n se encuentra cercana al límite sur de la Provincia Florística de California y la flora está influenciada por el desierto que se encuentra en su parte meridional. En total, 435 taxa fueron documentados, de los cuales 82% son plantas nativas. Alrededor de una de cada tres plantas nativas en San Quintín y sus á reas adyacentes es una especie sensible, documentada es este estudio como rara y/o endémica localmente, pero aú n quedan por evaluar la rareza y el estado de conservació n de varios taxa. Se identificaron cuatro há bitats principales y se presenta un listado florístico para cada uno. Los concheros y las charcas temporales representan microhá bitats con especies ú nicas que también merecen ser consideradas para efectos de conservació n. Todos los há bitats de San Quintín y sus á reas adyacentes se encuentran amenazados por actividades humanas y el uso del agua para la agricultura no es sustentable. Existe una necesidad urgente de conservar las á reas naturales que quedan en esta regió n, que aunque es ú nica ha sido fuertemente impactada. Las dunas de El Socorro y la zona de la bahía volcá nica tienen un valor particular de conservació n, ya que poseen muchos taxones endémicos a á reas muy restringidas. Al ser una á rea de transició n en un ''hotspot'' de biodiversidad, la zona de San Quintín y sus alrededores es el hogar de poblaciones de muchas especies que se hallan en el límite de sus rangos de dist...

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Biomization and quantitative climate reconstruction techniques in northwestern Mexico—With an application to four Holocene pollen sequences

Cited by 24 publications

References 105 publications

Assessing global biome exposure to climate change through the Holocene–Anthropocene transition

Assessing global biome exposure to climate change through the Holocene–Anthropocene transition

Comparisons between marine productivity and terrestrial input records in the Gulf of California over the last 28 ka

The Flora of Greater San Quintín, Baja California, Mexico (2005–2010)

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