Ernesto Franco-Vizcaı́no

Center for Scientific Research and Higher Education at Ensenada

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Scott L. Stephens

University of California, Berkeley

Richard A. Minnich

University of California, Riverside

Elena Solana‐Arellano

Center for Scientific Research and Higher Education at Ensenada

Danny L. Fry

University of California, Berkeley

Mario Salazar-Ceseña

Center for Scientific Research and Higher Education at Ensenada

Robert C. Graham

University of California, Riverside

Brandon M. Collins

University of California, Berkeley

Martı́n Escoto-Rodrı́guez

Autonomous University of San Luis Potosí

Héctor Echavarría-Heras

Center for Scientific Research and Higher Education at Ensenada

W. M. Jarrell

Illinois Department of Natural Resources

Cooperative Institutions

Center for Scientific Research and Higher Education at Ensenada

Claremont Colleges

University of California, Berkeley

University of California, Riverside

US Forest Service

Pacific Southwest Research Station

United States Department of Agriculture

Ensenada Institute of Technology

Sequoia (United States)

Riverside County Superior Court

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Comparing modern and past fire regimes to assess changes in prehistoric lightning and anthropogenic ignitions in a Jeffrey pine – mixed conifer forest in the Sierra San Pedro Mártir, Mexico

Canadian Journal of Forest Research (2007)

Rand R. Evett Ernesto Franco‐Vizcaíno Scott L. Stephens

Fire histories of Jeffrey pine ( Pinus jeffreyi Grev. & Balf.) – mixed conifer forests in the Sierra San Pedro Mártir, Baja California, Mexico, recently described through analysis of 300 years of tree-ring fire-scars, indicate there have been four distinct fire-regime periods based on fire frequency and size. We used modern lightning and fire data to assess whether the current lightning regime could have supported the prehistoric fire regime. Although there are several sources of uncertainty, the present lightning regime, concentrated in the summer with little spring activity, may be insufficient to support the high number and spring seasonality of fires recorded during some periods in the past. Changes in the ignition regime recorded during the past 300 years could have been due to anthropogenic and (or) climatic factors; available evidence suggests periods of frequent fire were dominated by anthropogenic ignitions.

Lightning

Fire regime

Fire history

Seasonality

10.1139/x06-280

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Citations (24)

WaterBalance atthe Southern Limitof the Californian Mixed-ConiferForestand Implications forExtreme-De¢citWatersheds

Ernesto Franco‐Vizcaíno Martı́n Escoto-Rodrı́guez

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Distribution and Regional Ecology of Californian Palm Oases Interpreted from Google Earth Images

Aliso (2011)

Richard A. Minnich Ernesto Franco‐Vizcaíno Mario Salazar-Ceseña

The native fan palms of the Baja California peninsula (Mexico) and neighboring southern California (USA) comprise two species each in Washingtonia and Brahea. While these are among the most familiar ornamental palms in the world, many features of their taxonomy, distribution, and environmental relationships remain unresolved. We utilized Google Earth Digital Globe imagery (and limited surveys by air and land) to develop the first map detailing the geographic distribution of palm populations in the Peninsular Range Province (PRP) and used these data to formulate new hypotheses on their biotic and abiotic relationships. We inventoried 15,216 populations covering an area of 8533 ha, containing an estimated 1.31 million trees. Tree populations estimated by manual tallies from Google Earth images closely matched direct counts published by previous workers. We documented significant extensions in the distributions of both Washingtonia specìes, as well as 66 hitherto unreported W. robusta oases in the Sierra La Asamblea. We also recorded thousands of upland populations of dwarf B. armata. Google Earth imagery shows that native fan palms are widespread in remote mountains of the entire peninsula, but in Baja California Sur W. robusta is mostly restricted to a few highly altered agricultural landscapes associated with extensive wetlands. It has long been assumed that the center of W. robusta distribution is in the tropical southern peninsula. Our observations suggest it may have been dispersed there by indigenous peoples before European contact, and its center of genetic diversity may instead lie in the Central Desert (ca. latitude 28º-30º N).

Peninsula

Endemism

Tree line

10.5642/aliso.20112901.02

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ORIENTATION OF CARBONATE LAMINATIONS IN GRAVELLY SOILS ALONG A WINTER/SUMMER PRECIPITATION GRADIENT IN BAJA CALIFORNIA, MEXICO

Soil Science (1997)

Ronald Amundson Robert C. Graham Ernesto Franco‐Vizcaíno

We observed, along a north-to-south transect in central Baja California, that the positioning(top vs. bottom) of pedogenic carbonate on gravel in Holocene soils was related to the proportion of winter versus summer/early fall precipitation. Carbonate coatings were found on gravel bottoms at sites where precipitation occurs predominantly in winter but on gravel tops at sites where summer/fall precipitation is dominant. The positioning of carbonate coatings co-varied with other ecosystem properties such as floral distribution, oxygen isotope composition of carbonate, and depth to the top of the Bk horizon in response to precipitation patterns. The processes responsible for the orientation of carbonate on gravels are unknown. We proposed that the nature of soil thermal gradients during major precipitation events or periods may influence carbonate solubility and, therefore, the loci of deposition. While the deposition of carbonate on gravel tops is apparently unique and restricted to areas of summer/fall precipitation in Baja California, the positioning of carbonate coatings in gravelly soils in this region may also provide some insight into long-term climate patterns in the perarid regions of the Sonoran Desert.

Deposition

10.1097/00010694-199712000-00009

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Citations (11)

Comparative Gas Exchange of Leaves and Bark in Three Stem Succulents of Baja California

American Journal of Botany (1990)

Ernesto Franco‐Vizcaíno Guillermo Goldstein Irwin P. Ting

10.2307/2444588

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Citations (11)

Dwarf pea response to gibberellic acid applied to soil through a drip irrigation system, and gibberellic acid biodegradation in soil

Plant and Soil (1988)

Sarah Anderson Ernesto Franco‐Vizcaíno W. M. Jarrell

Gibberellic acid

Plant Physiology

10.1007/bf02140008

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COMPARATIVE GAS EXCHANGE OF LEAVES AND BARK IN THREE STEM SUCCULENTS OF BAJA CALIFORNIA

American Journal of Botany (1990)

Ernesto Franco‐Vizcaíno Guillermo Goldstein Irwin P. Ting

Arborescent stem succulents in tropical and subtropical deserts depend on scarce and uncertain rainfall. Gas exchange and the diurnal acidity fluctuation of bark and ephemeral leaves were measured under both dry and moist soil conditions in Fouquieria columnaris (cirio or boojum tree) and Pachycormus discolor (torote bianco or elephant tree) and in stems of the columnar cactus Pachycereus pringlei (cardon) in the Central Desert of Baja California, Mexico. Results demonstrated that ephemeral leaves were the only site of exogenous CO2 assimilation in F. columnaris and P. discolor ; there was no measurable gas exchange across the green photosynthetic bark. The pattern of gas exchange in F. columnaris and P. discolor was consistent with that of C3 plants. P. pringlei was shown to be a typical Crassulacean acid metabolism plant on the basis of acid fluctuations and gas exchange. Chlorophyll fluorescence studies of the green bark of F. columnaris and P. discolor indicated that this tissue is photosynthetically functional, and that CO2 assimilation can rise above the compensation point under high CO2 concentrations, such as may occur within the plant. The green photosynthetic bark of these species may be an adaptation for surviving prolonged drought and may function to recycle endogenous respiratory CO2, thus maintaining the plant's energy reserves and permitting rapid production of leaves in response to infrequent rains.

10.1002/j.1537-2197.1990.tb11379.x

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Citations (27)

Soil in the agricultural area of Biosphere 2 (1991–1993)

Ecological Engineering (1999)

S. Silverstone Richard R. Harwood Ernesto Franco‐Vizcaíno J.P. Allen Mark D. Nelson

Biome

10.1016/s0925-8574(98)00098-6

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Citations (8)

Divergence in Californian Vegetation and Fire Regimes Induced by Differences in Fire Management across the U.S.-Mexico Boundary

Kluwer Academic Publishers eBooks (2005)

Richard A. Minnich Ernesto Franco‐Vizcaíno

Fire regime

Baseline (sea)

10.1007/0-306-47961-3_18

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Citations (3)

The length‐times‐width proxy for leaf area of eelgrass:criteria for evaluating the representativeness of leaf‐width measurements

Aquatic Conservation Marine and Freshwater Ecosystems (2011)

Héctor Echavarría-Heras Elena Solana‐Arellano Cecilia Leal-Ramı́rez Ernesto Franco‐Vizcaíno

ABSTRACT Conservation and remediation projects for Zostera marina populations require easy and economical methods for non‐destructive approximations of leaf area. Allometric models provide a reliable approach for estimating biomass in terms of leaf area, and the length‐times‐width proxy for leaf area is widely used. Although leaf length of Z. marina can be unambiguously determined as the span from the ligula to the tip, different methods have been reported for obtaining representative measurements of leaf width. Using allometric models and eelgrass leaf‐growth properties we derived criteria based on regression equations, for the assessment of the representativeness of leaf width as a determinant of leaf area. In comparison with other estimations reported in the literature, width measurements taken at the midpoint of the leaf produced the most consistent proxy values for leaf area of eelgrass. Copyright © 2011 John Wiley & Sons, Ltd.

Allometry

Zostera marina

Proxy (statistics)

Leaf size

10.1002/aqc.1219

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Citations (5)