Desert Plants, Volume 20, Number 2 (December 2004)

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Desert Plants, Volume 20, Number 2 (December 2004) Desert Plants, Volume 20, Number 2 (December 2004) Item Type Article Publisher University of Arizona (Tucson, AZ) Journal Desert Plants Rights Copyright © Arizona Board of Regents. The University of Arizona. Download date 06/10/2021 16:59:42 Link to Item http://hdl.handle.net/10150/555912 Volume 20, Number 2 December 2004 Desert Published by The University of Arizona for the Boyce Thompson Southwestern Arboretum Plants A Rapid Biological and Ecological Inventory and Assessment of the Cajon Bonito Watershed, Sonora Mexico. Part II: Using the Variable Transect Robert Hunt and Walt Anderson 3 The Sperrgebiet- a Diversity Hotspot of Desert Plants Antje Burke and Coleen ~annheilner 19 Chollas, Circles and Seris: Did Seri Indians Plant Cactus at Circle 6? Thomas Bowen, RichardS. Felger and R. James Hills 26 2 Desert Plants 2004 Desert Plants Volume 20, Number 2, December 2004 A journal devoted to broadening knowledge of plants indig­ Published by The University of Arizona enous or adapted to arid and sub-arid regions and to encour­ for the Boyce Thompson Southwestern Arboretum aging the appreciation of these plants. 3 7 615 East Highway 60 Superior, Arizona 85273-5100 Margaret A. Norem, Editor Copyright 2004 2120 E. Allen Road The Arizona Board of Regents on behalf of The University of Tucson, Arizona 85719 Arizona ( 520) 318-7046 [email protected] The Boyce Thompson Southwestern Arboretum at Superior, Arizona is cooperatively managed by the Arizona State Parks Board, the Boyce Thompson Southwestern Arboretum, Inc., and The University ofArizona. Not the Desert.. Supporters Having lived most of my life in the Sonoran Desert, I could 1. N. Dean Ricer be described as a "transplanted Arizona native". Considering 2. Susan Skirvin myself an Arizonan, the overwhelming urge to "return to my roots" came as somewhat of a surprise. This fall I took a Underwriters sentimental journey back to Montana and couldn't resist 1. Arizona Native Plant Society including a Montana image in this issue. It is a view of the 2. Colossal Cave Mountain Park Missouri River, taken outside of Helena, Montana. Lewis 3. Harris Environmental Group, Inc. and Clark crossed the entire state in 1805 and may have 4. John Pierce, M.D. seen similar sights. I purposely did not crop the "Big Sky". Cover: Young Arizona Cypress (Cupressus arizonica) Cajon Bonito, NE Sonora, Mexico. April1998. (W. Anderson) Variable Transect Hunt and Anderson 3 (Tenneson 1998; CI 1997) and Rapid Biological Inventories A Rapid Biological and Ecological [RBI] (FMNH 2004). One of these new field methods, the Inventory and Assessment of the variable transect, has been used for inventories in neotropical forests with very high biodiversity values and complex arrays Cajon Bonito Watershed, Sonora, of habitats. The variable transect requires few tools and equipment. Unlike many area-based plot methods, the Mexico. Part II: Using the variable transect's size dimensions are determined by a set number of individuals to be sampled in predetermined plant Variable Transect classes. It can provide a high-quality snapshot of a plant community, its species and its community structure. These Robert Hunt data are enough to describe richness, abundance, and diversity and to make comparisons among different sites. M.A. Environmental Studies Prescott College A rapid inventory and assessment was conducted in the Cajon Prescott, Arizona 86303 Bonito watershed in northeast Sonora, Mexico, using variable transects for the plant inventories. The method was employed Walt Anderson in its original form as related by its developer, Robin Foster of the Field Museum of Natural History (personal Environmental Studies Program communication 1998). Prescott College Prescott, Arizona 86303 Origin of the Variable Transect The variable transect is one of several rapid field methods Abstract developed by the environmental advocacy group The variable transect is an abbreviated, simplified version Conservation International [ CI]. It is part of a suite of field of a standard belt transect used in floristic analysis. activities that collectively could be called "emergency field Developed by the Rapid Assessment Program of ecology" (CI 1997). CI and the Field Museum teams focus Conservation International as part of a suite of "emergency their conservation efforts on high-biodiversity wilderness field ecology" methods, it allows scientists to quickly habitats in .the tropical regions of the world, especially inventory and assess habitats with high biodiversity values Central and South America (Parker and Bailey 1991; Parker that are threatened by imminent development or other human and Carr 1992; Parker et al. 1993; Schulenberg and Aubrey activities. This alternate method was utilized in a study of 1997). Usually these sites are relatively untouched, but they Cajon Bonito in Sonora, Mexico. Assessment of the variable often face imminent pressure for development. CI and transect's value as both a convenient qualitative and FMNH pursue protocols that include intensive field quantitative tool for field studies and observations in the inventories, along with training and education of local and plant communities of the Southwest is reflected in the indigenous people, and coordination with local government resulting database. The method proved flexible enough to agencies and non-government groups for protection ofthe sites. vary the suite of floristic data to be sampled with little significant variation in the time spent applying the transect. The Rapid Assessment Program (RAP) puts teams of The relatively quick sampling of flora, combined with easily scientists from Conservation International onto sites they characterized environmental observations, yields a wealth of have predetermined are at risk in order to conduct quick, information with less effort than most standard field methods. intensive surveys. CI refers to their field personnel as scientific "swat teams." These teams are composed of some Introduction of the most experienced and expert tropical field researchers The time, effort and cost of conducting floral community in the world. Since their formation in 1990 through the studies using rigorous methods can limit the opportunities inspiration of Ted Parker and under the co-leadership of for researchers to increase effective sample sizes with Alwyn Gentry (both now deceased), they have conducted additional surveys. Landscapes and ecosystems that may be dozens of surveys and assessments throughout the world. unique sites for biodiversity or opportunities for conservation They have also trained local naturalists and students in their go unstudied and undescribed in the literature. field methods and the follow-up software programs so that they can continue longer term monitoring studies and Alternative field methods have been developed recently that conservation activities. allow researchers to quickly inventory and assess ecosystems that are in the path of some form of development. Initially, the RAP team's strategy was to survey as quickly Conservation International and the Field Museum ofNatural and intensively as possible using standard field methods. History conservation science programs have led the way in The RAP team's primary objectives were to identify species developing newer, faster means of biotic inventory and at the site, assess the ecosystem qualities of the area, and assessment with their Rapid Assessment Program [RAP] then disseminate the information immediately. As such 4 Desert Plants 2004 surveys continued over the next several years, the RAP or Madrean Archipelago, is considered a regional methods were refined and streamlined. Practical shortcuts '"megacenter" of biodiversity on a global scale (Felger and grew from real field experience. The variable transect is one Wilson 1995). Much ofthis diversity is due to the interactions of those shortcuts. between a complex landscape and topography and the regional bimodal climate. The Variable Transect: Descriptions and Applications The variable transect is a version of the belt transect, but its For the rapid inventory and assessment of Cajon Bonito, dimensions are determined by the number of individual plants significant adjustments to the original intended protocol were to be counted (Foster, pers. comm. 1998). It is not a standard made. Since the field surveys were in the late fall and winter, area-based plot method. In habitats and communities that sampling was limited to trees and shrubs and was conducted have been identified for inventory and assessment, the plant prior to leaf drop. Woody lianas, vines and succulents were species that are expected are divided into classes by size included in the shrub class. Eventually, many identifications (e.g.,>30 em diameter at breast height-dbh), height (e.g., 8- were conducted using only stems and other cryptic features. 25 m), taxon (e.g., Pinus ponderosa or all adult conifer species). or other ecological and physiological classes that Field Studies in Cajon Bonito will provide the sought-after data. In forests and other Natural History and Ecology of the Cajon Bonito Region complex communities, canopy trees could be used as a class Natural history and ecology were covered in Part I in Desert that defines the ultimate dimensions ofthe transect. The first Plants Volume 18, Number 2, December 2002. A brief 50 or I 00 individuals of a class that are encountered within summary follows. Cajon Bonito is part of the Rio Yaqui a predetermined width determine the length. watershed, which drains the western and northwestern
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