Cole and Cole (2015)

the new mexico botanist Special Issue Number 4 September 2015 proceedings of the fourth Natural History of the Gila Symposium October 25–27, 2012 Western New Mexico University Silver City, New Mexico edited by Kathy Whiteman Department of Natural Sciences, Western New Mexico University William Norris Department of Natural Sciences, Western New Mexico University 2015 The New Mexico Botanist, Special Issue No. 4, September 2015 An Overview of Aridland Ciénagas, with Proposals for Their Classification, Restoration, and Preservation A.T. Cole and Cinda Cole 15.15 Separ Rd., Silver City, NM 88061 [email protected] Abstract important to the Southwest? Will a ciénaga classification sys- Ciénagas are the American Southwest’s most unusual tem and the creation of Ciénaga Coordinators help to restore wetlands, yet they are dwindling. This paper addresses what and preserve them? they are, their uniqueness and importance, how they devel- oped, and the causes for the loss of most ciénaga habitat. Ciénagas Defined We also propose a classification system for ciénagas that will contribute to a more meaningful and better-focused discus- Undamaged ciénagas are freshwater or alkaline wet mead- sion about ciénagas, provide an inventory of known ciénagas, ows with shallow-gradient, permanently saturated soils in and suggest a system of Ciénaga Coordinators with the goal otherwise arid landscapes that in earlier time supported of identifying, restoring, and preserving the few remaining lush meadow grasses and often occupied the entire widths ciénagas. Finally, the inventory from this paper is made avail- of valley bottoms. Ciénagas occur because the geomorphol- able online in an interactive, open, moderated format that ogy forces water to the surface, and historically they covered will allow anyone to contribute to the correction, evolution, large areas rather than occurring as single pools or channels and general improvement and growth of this database, and (Hendrickson and Minckley 1985; Sivinski and Tonne 2011). to download and use the content. A link to this system can Ciénagas are usually associated with seeps or springs and are be found in a permanent archive of this paper at http://hdl. occasionally found in canyon headwaters or along the margins handle.net/2152/30285. of streams (Sivinski and Tonne 2011). In a healthy ciénaga, water slowly migrates through long, wide mats of thick, Introduction sponge-like wetland sod. Ciénaga soils are squishy, permanently saturated, organic, anaerobic, and black. The general public knows what rivers are, and even people Highly adapted grasses (Poaceae), sedges (Cyperaceae), unconcerned about the environment understand the im- and rushes (Juncaceae) are the dominant plants in ciénagas, portance of drinking water and watercourses such as rivers, with riparian tree species—Goodding’s willow (Salix gooddin- creeks, streams, and brooks. But there is a unique wetland gii), Fremont’s cottonwood (Populus fremontii), and scattered in the American Southwest that not many people know at Arizona walnuts (Juglans major)—found along drier margins all: the aridland ciénaga. Few uncompromised ciénagas or down-valley where the ciénaga ends and water disappears remain functional, and, absent an awareness of what and underground. The telltale signs of an aridland ciénaga are how important they are, we may soon see these endangered ground-fed persistent water, gray or oxidized soils, soil fines wetlands become extinct. The Endangered Species Act does (silts, clay, and organic particles) or near fines, and often the not yet protect habitats independently of individual species, occurrence of plants endemic to ciénagas. but if it did, ciénagas would undoubtedly receive protection. Since the late 1800s, many of these ciénagas have lost Ciénaga is a Spanish term used in the Southwest for a silty their instream or wetland function; unincised ciénagas are marshy area, a bog, or a shallow, slow-moving flow of water essentially nonexistent today (Minckley et al. 2009) and through dense surface vegetation (Hendrickson and Minckley most ciénagas are substantially reduced in size, with succes- 1985; Minckley et al. 2009). We provide a discussion of the sional tree species common along deeply cut channels due to source and alternate spellings and punctuation of this term in the ongoing, region-wide erosion that followed the arrival of Appendix A. Europeans (Fig. 1). As described below, the misuse of land by Our interest in ciénagas emerged from an undertaking frontiersmen entrenched water flow between what became to restore the 14.48-km (9-mi), severely incised—deeply vertical walls and established incisions that have resulted in down-cut or eroded by rapid water flows—reach of the Burro an ever-worsening erosive process and drawdown of local wa- Cienaga on the Pitchfork Ranch in Grant County, New ter tables (Fig. 2). Some southwestern ciénagas have simply Mexico, in the southwest corner of the state (Cole and Cole dried up because their aquifers were captured and depleted 2010; Helbock and Cole 2014). In this paper, we answer the for farming or industrial purposes (Sivinski and Tonne 2011). following questions about this imperiled ecosystem: What is This pervasive drying of most marshland environments left a ciénaga? How and when did ciénagas form, what damaged behind few ciénagas and those that survived are significantly them, what were their historic numbers, how much or what reduced in size. Many of the remaining ciénagas look and percentage of ciénaga habitat remains, and why are ciénagas function like creeks: narrow, incised, and continuing to de- 28 29 The New Mexico Botanist, Special Issue No. 4, September 2015 The ciénagas discussed here are not to be confused with typical wetlands found throughout the North American continent. What distinguishes “aridland ciénagas” is their location in deserts and their association with groundwater discharge— springs and groundwater seeps in otherwise arid lands—which lends them a large degree of perma- nence, biogeographic isolation, and stability. Ciénagas are commonly overlooked but are an important subset of wetlands in the North Ameri- can Southwest. A recent study (Dahl 2011) looked at the extent and habitat type of wetlands throughout the conterminous United States and con- cluded that there were an estimated 44.6 million ha (110.1 million ac) of wetland habitat. Despite this comprehensive survey and detailed treatment of a wide variety of wetlands—freshwater and salt- Fig. 1. Looking down-channel, creek-like portion of the Burro Cienaga, water, marshes and ponds, and even descriptive Pitchfork Ranch, Grant County, in southwest New Mexico. Photo: Dennis types such as prairie pothole wetlands—the report O’Keefe (2008). makes no mention of ciénagas. Southwest aridland ciénagas discussed here grade (Fig. 3). Since the late 1800s, natural wetlands in arid differ from the ciénaga wetlands of Colombia and semi-arid desert grasslands of the American Southwest and other South American countries. There are many dozens and Northern Mexico have largely disappeared (Minckley and of wetlands bearing the name “ciénaga,” covering more Brunelle 2007). than 7,800 km (4,847 mi) in Colombia alone (Subgerencia Hendrickson and Minckley (1985) first alerted the Cultural del Banco de la República 2005), but those are not Southwest academic world to the importance of the region’s the desert groundwater-fed ciénagas of the Southwest. The overlooked ciénagas. Prior to that time, many believed that Colombian ciénagas represent different wetland systems the only good wetland was a drained wetland (McCool 2012). altogether. Perhaps those studying ciénagas would do well to However, since Hendrickson and Minckley’s (1985) rather in- refer to the ciénagas mentioned in the Southwest as “aridland auspicious invitation for further study of ciénagas, the efforts ciénagas,” thereby avoiding confusion with high-mountain to understand and restore them have gained prominence. wet meadows and other wetland ciénagas elsewhere that A sense of how poorly ciénagas had been viewed histori- function differently. cally can be gleaned from a remark made during the naming of Silver City, New Mexico. When city fathers met in 1870 to choose a name for the community occupying the once unmolested La Ciénega de San Vicente, a lengthy discussion finally reached consensus to discard San Vicente and to call their new town Silver City. Upon hearing the choice, one of the men in attendance remarked: “It was one hell of a name to call a town on a mud flat” (Alexander 2005, 89). Similarly, consider this excerpt from the beloved New Mexico novel Red Sky at Morning (Bradford 1968). In this 1940s-era conversation between the narrator, Joshua Arnold, and his class- mate, this exchange occurs (p. 86): “I didn’t know there was this much water around Sagrado . [t]he Sagrado River’s been dry since I got here.” “This is a cienega,” Parker said. “It’s some kind of underground spring, but it’s not good Fig. 2. The eight-foot wall shown here, down-channel right, is typical of for anything but making the ground wet. Costs the incision damage in many ciénagas. This pool, not a typical feature in a a fortune to drain it or pump it off, and Cloyd healthy ciénaga, is located in kilometer 1 of the 14 km (9 mi) Burro Cienaga isn’t about to spend money for things like that.” reach on the Pitchfork Ranch. Photo: Cinda Cole (2005). 30 The New Mexico Botanist, Special Issue No. 4, September 2015 Fig. 3. Looking up-channel, a short section of the approximately 3.2 km (2 mi) ciénaga portion of the 14.48 km (9 mi) reach of the Burro Cienaga (full course is 747.2 km, 47.6 mi) on the Pitchfork Ranch, is the result of redirecting the broad ciénaga flow into what became a creek-like incision. This resulted from an effort to avoid flooding two later abandoned agriculture fields, situated down-channel left or on viewer’s right.

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