La Pera

La Pera is a Zona Sujeta a Conservación Ecológica (State Ecological Conservation Zone) covering 7,506.61 hectares in the central portion of the municipality of Berriozábal, western Chiapas, Mexico, at elevations ranging from 500 to 1,500 metres above sea level. ^[1] Decreed on March 22, 2011 by the Government of Chiapas following a technical justification study prepared by the Instituto de Historia Natural y Ecología (IHNE), the reserve protects a continuous block of high perennial tropical forest (Selva Alta Perennifolia, approximately 2,963 ha) and high sub-perennial tropical forest (Selva Alta Subperennifolia, approximately 1,440 ha) that function as an ecological corridor between the Reserva de la Biosfera Selva El Ocote to the west and the Parque Nacional Cañón del Sumidero to the east. ^[1] The reserve intersects two of CONABIO's nationally recognised Terrestrial Priority Regions: RTP-132 (Selva Zoque–La Sepultura) and RTP-141 (La Chacona–Cañón del Sumidero), and is the designated type locality for two globally endemic amphibians found nowhere else on Earth. ^[2]

La Pera supports 252 documented animal species across mammals, birds, amphibians, and reptiles, of which 42 are listed under NOM-059-ECOL-2001 and five appear on the IUCN Red List. ^[1] The reserve holds the global type locality for two endemic amphibians: the black jumping salamander Ixalotriton niger (listed as Peligro de Extinción, endemic genus of Chiapas) and the frog Eleutherodactylus pozo (endemic), neither of which is known from any other location in the world. Additional endemic vertebrates include the green-fronted hummingbird (Amazilia viridifrons, Amenazada), the Berriozábal anole (Anolis parvicirculatus, Protección Especial), Stuart's robber frog (Eleutherodactylus stuarti, Protección Especial), the Tuxtlas night lizard (Lepidophyma tuxtlae, Protección Especial), and Brown's leopard frog (Rana omiltemana, Peligro de Extinción). ^[1] Flagship species include the resplendent quetzal (Pharomachrus mocinno, Peligro, IUCN High Risk), the king vulture (Sarcoramphus papa, Peligro de Extinción), the ocellated quail (Cyrtonyx ocellatus, IUCN High Risk), and the keel-billed toucan (Ramphastos sulfuratus, Amenazada). Three salamander species in the genus Bolitoglossa (B. franklini, B. mexicana, B. occidentalis) are also documented. Both quetzal and king vulture sightings have declined in frequency, reflecting anthropogenic pressure on the reserve's forest cover.

The flora of La Pera comprises over 331 plant species belonging to 91 families, making it among the most species-rich state-level protected areas in Chiapas. ^[1] The dominant family is Fabaceae with 29 species, followed by Orchidaceae (25), Rubiaceae (17), Acanthaceae (17), Asteraceae (15), Bromeliaceae (14), and Euphorbiaceae (12). Ten plant species are protected under NOM-059-ECOL-2001, including Talauma mexicana (Amenazada), Guatteria anomala (Amenazada), the night-blooming cereus Cryptocereus anthonyanus (Amenazada), Tillandsia seleriana (Amenazada), Hampea montebellensis (Amenazada), Louteridium parayi (Peligro de Extinción), and the endemic bromeliad Tillandsia socialis (Amenazada). ^[1] Four plant species are additionally listed as IUCN Vulnerable: Ilex quercetorum, Tillandsia socialis, Saurauia oreophila, and Persea floccosa; two are Endangered: Hampea montebellensis and Zanthoxylum procerum. Key canopy species of the Selva Alta Perennifolia include Terminalia amazonia, Vochysia hondurensis, Cedrela odorata (red cedar), Swietenia macrophylla (mahogany), Brosimum alicastrum, Pterocarpus hayesii, and Dialium guianense. Epiphytic bromeliads (Aechmea spp.), orchids, and ferns are abundant throughout the humid forest.

The geology of Berriozábal municipality, in which La Pera is situated, is constituted by Cretaceous Superior and Inferior sedimentary rocks—primarily marine limestones—together with Tertiary Paleocene deposits of lutita (mudstone) and arenisca (sandstone). ^[1] This lithology reflects the broader karst character of the western Chiapas interior, where soluble carbonate rocks underlie much of the landscape, creating cave systems, sinkholes, and subterranean drainage. The municipality is more than 70% mountainous terrain with principal elevations at Cerros de la Tienda, la Borcelana, Paso Burro, Paso Naranjo, La Campana, and La Marimba. Three main soil types occur within La Pera's polygon: luvisol covers the largest central area (clay-rich subsoil, slightly acid pH 4–5, susceptible to erosion; best suited to permanent tree crops); acrisol occurs to the north (acid, nutrient-poor, erosion-prone); and litosol to the south (thin, highly variable). ^[1] The reserve drains into the Subcuenca El Chapopote of the Cuenca del Río Grijalva, which CONABIO designates as a national hydrological priority region carrying approximately 30% of Mexico's total river flow and supplying the Netzahualcoyotl hydroelectric plant.

La Pera's climate reflects its location at the transition between the Central Depression of Chiapas and the montane zone of Berriozábal municipality (municipal seat at approximately 900 m.a.s.l.). Two Köppen climate types occur within the protected area polygon: Am (cálido húmedo with summer and autumn rains, mean annual temperature above 22°C) in the northern section, and Aw1 (cálido subhúmedo con lluvias medias en verano, mean annual temperature above 22°C) in the centre and south. ^[1] Mean annual temperature for the municipality is approximately 20°C, with a maximum of 35°C. The annual rainfall regime has a concentrated rainy season from June to October; maximum recorded annual precipitation reached 9,087 mm across the municipality, with approximately 100 to 125 rainy days per year. Dominant winds flow north-to-south. The higher elevations of the reserve (1,000–1,500 m.a.s.l.) support Bosque Mesófilo de Montaña (cloud forest) that intercepts persistent mist, supplementing rainfall and maintaining soil moisture year-round—a critical mechanism for the perennial water supply to Berriozábal and surrounding communities. ^[2]

The municipality of Berriozábal's recorded history traces to 1596, when indigenous leaders Tomás and Rodrigo Ponce de León—from the pueblo of Chiapa—founded the hacienda that would eventually become the municipal seat. ^[1] The hacienda passed through multiple colonial and post-colonial owners over the 17th and 18th centuries, becoming known as Hacienda Don Rodrigo by 1689. Under Miguel Antonio Gutiérrez in the late 18th century, sugar cane was cultivated at commercial scale and the estate diversified significantly. Following his death in 1832, the land was subdivided among heirs, eventually dissolving into smaller private holdings. The settlement that formed on the old hacienda grounds was elevated to the category of pueblo by Governor Francisco León's decree of May 27, 1898, and named Berriozábal. ^[1] As of 2000, approximately 1,383 inhabitants lived within La Pera's polygon across 54 small communities, with 91% of the economically active population engaged in primary-sector activities (agriculture, livestock, forestry), predominantly slash-and-burn maize and frijol cultivation—a land-use pattern that has historically driven deforestation pressure within the reserve.

The Estudio Técnico Justificativo (ETJ) for La Pera was prepared by the Instituto de Historia Natural y Ecología (IHNE) of Chiapas—the state institution responsible for Chiapas's protected area system over more than 60 years—with field surveys conducted in the early 2000s. ^[1] The ETJ documented the reserve's exceptional endemic biodiversity, particularly the globally restricted amphibians Ixalotriton niger and Eleutherodactylus pozo, and proposed formal protection under the category of Zona Sujeta a Conservación Ecológica pursuant to Article 42 of Chiapas's Ley del Equilibrio Ecológico y Protección al Ambiente. The study proposed a polygon of 7,506.61 hectares—encompassing all documented primary Selva Alta Perennifolia and Selva Alta Subperennifolia—whose western boundary coincides with the polygon of the Reserva de la Biosfera Selva El Ocote. ^[1] The official state decree was issued on March 22, 2011, by the Government of Chiapas through the Secretaría de Medio Ambiente e Historia Natural (SEMAHN), formally establishing the area. Management is coordinated by SEMAHN with the municipal government of Berriozábal and local civil organisations. ^[2]

La Pera's primary natural attraction is its intact high perennial and sub-perennial tropical forest, accessible by dirt road from Berriozábal (approximately 10 km from the municipal seat). ^[1] The reserve offers outstanding birdwatching opportunities for endemic and regionally restricted species, including the resplendent quetzal (Pharomachrus mocinno), keel-billed toucan (Ramphastos sulfuratus), green tucanet (Aulacorhynchus prasinus), scissor-tailed hummingbird (Doricha enicura), and the endemic green-fronted hummingbird (Amazilia viridifrons). ^[2] Cave systems and natural water features in the broader Berriozábal municipality—including the Cuevas del Pozo Curro, del Perro, and del Perico, and the Pozas del Sabinal—offer speleological and aquatic interest. The position of La Pera as a biological corridor between Selva El Ocote and Sumidero Canyon means that ecological visits can be integrated into a broader west-Chiapas conservation circuit. The reserve management norms permit construction of interpretive trails, visitor centres, and designated camping areas; visitors should confirm current access conditions and guided tour availability with SEMAHN Chiapas in Tuxtla Gutiérrez, approximately 25 km by highway from Berriozábal.

La Pera is accessed from Berriozábal municipality (approximately 10 km from the municipal seat), which is linked to Tuxtla Gutiérrez—the Chiapas state capital—by the Pan-American highway (approximately 25 km). ^[1] Tuxtla Gutiérrez is served by Ángel Albino Corzo International Airport with connections to major Mexican cities. Within La Pera's polygon, two main terracería (dirt) roads provide internal access: one departing the municipal seat northwest toward the Joaquín Miguel Gutiérrez community zone, and a second skirting the polygon's eastern boundary northward toward Río Blanco. ^[2] Tourist infrastructure in Berriozábal is limited (approximately two hotels as of the ETJ survey period); Tuxtla Gutiérrez provides a full range of accommodation, dining, and services. As a state conservation zone, La Pera has limited formal visitor facilities within the protected boundary; SEMAHN Chiapas is the contact authority for access permits, research coordination, and current ecotourism operator information.

La Pera faces a complex suite of conservation pressures documented in its official technical justification: illegal timber extraction using chainsaws from the interior forest; slash-and-burn clearing on steep slopes by communities with high marginalisation and few alternative livelihoods; unregulated hunting and collection of orchids and endemic species; extraction of topsoil for commercial nurseries; and ongoing landscape fragmentation that increasingly isolates La Pera's forest patches from the Selva Zoque corridor. ^[1] Approximately 1,383 people in 54 communities reside within the polygon, 99% using firewood for cooking, representing a sustained resource extraction pressure that the reserve management must accommodate rather than simply restrict. The most critical global conservation argument for the area is as the only confirmed habitat for the endemic amphibians Ixalotriton niger and Eleutherodactylus pozo—their loss would constitute global extinctions. The Cuenca del Grijalva system, fed by La Pera's Subcuenca El Chapopote, supplies approximately 30% of Mexico's total river flow and powers the Netzahualcoyotl hydroelectric facility—providing a strong water-security rationale for forest protection alongside the biodiversity case. ^[1] Payment-for-ecosystem-services (PSA) programs and community-based ecotourism coordinated through SEMAHN and local civil organisations represent the primary sustainable development pathways for reducing pressure on the reserve's forest cover.