Plant endemism and natural protected areas in the peninsula of Baja California, Mexico

Riemann, Hugo; Ezcurra, Exequiel

doi:10.1016/j.biocon.2004.07.008

Cited by 79 publications

(57 citation statements)

References 9 publications

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“…1 However, its extraordinary and unique diversity is not adequately protected by the existing protected areas protocols. 1 In the absence of perennial surface-water sources, any economic development in the area will depend solely on groundwater. It is therefore substantial to establish a new approach that broads the goal of biodiversity protection.…”

Section: Introductionmentioning

confidence: 99%

Investigating regional groundwater flow systems in baja california central desert region

Ouysse¹,

Wehncke²,

Rivera³

2018

IJH

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In Northern Baja California, environmental conservation may not be fully accomplished in the absence of a clear understanding of key factors controlling and protecting biodiversity. Groundwater is an environmental agent triggering the presence of a wide range of arid ecosystems; therefore, any sustainable development in the region has to maintain a balance between environmental, social and economical benefits. The present study has placed a great emphasis on the understanding and distribution of groundwater flow systems, and their environmental interactions in the protected area of the Valle de Los Círios, using physical-chemical and isotope methods. Results show the presence of three groundwater groups portraying contrasting flow systems conditions. Analyzed samples have been classified as fresh-brackish, and thermal alkaline groundwater as suggested by pH, temperature and TDS. The Br/Cl ratio in most samples was close to the ocean molar value (1.5x10 -3 ) indicating the importance of marine aerosol fraction in the recharged waters; however, Mg/Cl,Na/Cl,Ca/Cl,SO 4 / Cl and Cl/HCO 3 +Cl ratios were significantly different to those of seawater mixing conditions. Dominant ions (Na,Ca and Cl), chemical age proxies (Li), and δ 18 O suggest waters with long residence time, with the possibility of been recharge during the late glacial period. Thermal ground water shows low minor and trace element content and exhibits the dominance of Na-plagioclase hydrolysis; their low levels of Sr and Ba suggest negligible contact with calcareous rocks and their estimated temperature at depth (80to100°C) and TDS suggest groundwater has travelled through fractured media. This introduction study suggests that desertic species in Valle de Los Cirios are highly sustained by groundwater of local and intermediate flows.

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Section: Introductionmentioning

confidence: 99%

Investigating regional groundwater flow systems in baja california central desert region

Ouysse¹,

Wehncke²,

Rivera³

2018

IJH

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Section: Conservation Statusmentioning

confidence: 99%

“…It is important to note that this protected area preserves only one of the many vegetation types on the peninsula (Riemann and Ezcurra 2007), and the percentage of land already protected is a poor indicator of conservation needs in the surrounding areas . The coastal corridor of CFP in Baja California is facing the greatest development and urbanization pressures in the state (Riemann and Ezcurra 2007). Despite the high endemism and level of conservation priority indicated by Riemann and Ezcurra (2007), there is currently no legal protection for any of the coastal lands in the CFP of Baja California other than that provided by ZOFEMAT (Zona Federal Marítimo Terrestre) concessions, which control land use of the tidal zone around the entire coast of Mexico (Riemann and Ezcurra 2005).…”

Section: Conservation Statusmentioning

confidence: 99%

“…The vegetation in northwestern Baja California is thus highly heterogeneous and includes many putatively relictual species and plant associations (Shreve 1936;Peinado et al 1995a). The coastal strip from 32u latitude southward to 29.5u has been shown to be an area of high endemism (i.e., high richness of endemic species) within the peninsula of Baja California, harboring at least 106 endemic plant taxa, as well as several near-endemic taxa (Riemann and Ezcurra 2007).…”

Section: Introductionmentioning

confidence: 99%

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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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“…These priority conservation areas are spatial representations of the territory defined by environmental, social and cultural characteristics whose presence is threatened by human activities, natural causes, or both (Collins et al 2001, Morgan et al 2005. The designation of priority conservation areas for carbon sequestration have already been used to promote the reduction of high rates of deforestation and restore degraded areas (Saavedra et al 2011, Alvarez & Rubio 2013) -a strategy that arose from collaboration between foreign research groups and Mexican researchers (Cantú et al 2004, Riemann & Ezcurra 2005.…”

Section: Introductionmentioning

confidence: 99%

Identifying priority conservation areas for above-ground carbon sequestration in Central Mexico

Cruz-Huerta¹,

González-Guillén²,

Martínez-Trinidad³

et al. 2017

iForest

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Identifying forest ecosystems with significant ecological, social, and/or economic values is an important first-step in conserving landscape function. Here, we identify priority conservation areas in the municipalities of Chignahuapan and Zacatlan, Puebla (Mexico), based on: (i) their capacity to sequester atmospheric CO2; and (ii) risk of future deforestation. We also explore management strategies for priority-lands conservation in the Mexican context. Aboveground C sequestration was estimated using wood density and biomass expansion-factor data available from local forestry sources. Deforestation risk was estimated by a probabilistic model of land use change using socioeconomic and biophysical variables. Carbon sequestration estimates ranged from 14 to 531 Mg ha -1 for Chignahuapan and Zacatlan, respectively. An estimated 11,746 and 4,406 ha of forest was determined to be at risk of deforestation in each municipality. Of these at-risk lands, 2,421 and 1,798 ha were determined to be at high risk. In combination, we determined that 10,687 and 4,319 ha, respectively, are priority lands for carbon sequestration in Chignahuapan and Zacatlan, of which 628 and 310 ha were determined to have high conservation priority. Identifying priority conservation areas through the integrated assessment of carbon sequestration and deforestation risk can enhance efforts to target land management strategies to mitigate climate change impacts. This approach can serve as a model for other forested regions in Mexico and other countries.

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Plant endemism and natural protected areas in the peninsula of Baja California, Mexico

Cited by 79 publications

References 9 publications

Investigating regional groundwater flow systems in baja california central desert region

Investigating regional groundwater flow systems in baja california central desert region

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

Identifying priority conservation areas for above-ground carbon sequestration in Central Mexico

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