Araucárias

Araucárias National Park is a federal protected area of approximately 12,841 hectares in the western highlands of Santa Catarina state, southern Brazil, spanning the municipalities of Passos Maia and Ponte Serrada. ^[1] Established on 19 October 2005, it was created to protect one of Brazil's most threatened ecosystems — the Araucária mixed forest (floresta ombrófila mista), characterised by the iconic Paraná pine (Araucaria angustifolia) — together with associated grasslands and river headwaters. ^[2] Elevations range from 805 to 1,218 metres, giving the park a cool, temperate-influenced climate unusual for Brazil. ^[3] It lies within the Atlantic Forest biome and protects the headwaters of the Chapecó and Chapecózinho rivers, important tributaries of the Uruguay basin. The park represents a critical remnant of a forest type that once blanketed the southern Brazilian highlands but has been reduced by well over ninety percent through logging and agricultural clearance. It is administered by ICMBio.

The Araucária mixed forest of the park supports a distinctive fauna adapted to the cool subtropical highlands. Mammals include South American tapir, puma, ocelot, maned wolf, and southern coati. ^[1] The park is important for birds tied to Araucária forest, notably the endangered vinaceous-breasted parrot (Amazona vinacea) and the rare helmeted woodpecker (Celeus galeatus). The protein-rich pinhão seeds of the Araucária tree are a key food resource that sustains seed-dispersing animals such as the azure jay, squirrels, and agoutis, which in turn aid the pine's regeneration. Streams and rivers draining the park support freshwater fish of the Uruguay basin, while the damp forest floor and stream margins harbour a rich amphibian community, including numerous tree frogs. This cool-adapted assemblage differs markedly from the fauna of tropical Brazilian forests, underscoring the park's biogeographic distinctiveness.

The park's defining feature is the Araucaria angustifolia, a coniferous tree whose umbrella-shaped canopy dominates the upper forest and gives the landscape its unmistakable character. Listed as critically endangered, this species once formed vast forests across the highlands of Paraná, Santa Catarina, and Rio Grande do Sul. ^[1] Within Araucárias National Park it grows alongside other threatened species, including the tree fern Dicksonia sellowiana and the imbuia (Ocotea porosa), a prized hardwood. The forest understory holds a rich community of bromeliads, ferns, orchids, and native shrubs, while gallery forests along watercourses add riparian species. Patches of highland grassland (campos) interspersed with the forest increase habitat diversity. This mosaic of Araucária forest and associated biodiversity makes the park one of the most ecologically significant remnants of the mixed ombrophilous forest, a formation now surviving in only a small fraction of its original extent.

The western plateau of Santa Catarina, where the park lies, is underlain by the Serra Geral Formation — a thick sequence of Cretaceous basaltic lava flows erupted during the Paraná-Etendeka volcanism that accompanied the opening of the South Atlantic, one of the largest volcanic events in Earth's history. These dark, fine-grained basalts weather to deep, clay-rich, fertile soils that historically supported both luxuriant forest and productive farmland. The plateau is dissected by river valleys cutting downward through the basalt layers, forming steep-sided valleys and waterfalls where rivers such as the Chapecó and Chapecózinho begin their descent toward the Uruguay drainage. The relatively flat plateau surface contrasts with the incised valleys of the park's lower reaches. Outcrops of vesicular basalt, reflecting gas bubbles trapped in the original lava, are common throughout the area and testify to the region's volcanic origins.

Araucárias National Park has a humid subtropical highland climate (Köppen Cfb), with cool temperatures, abundant rainfall spread through the year, and occasional frost and even snow in winter. Annual rainfall averages approximately 1,930 millimetres. ^[1] Winter temperatures regularly drop below 5 degrees Celsius, and frost occurs most winters on the plateau, while summers are mild, with average temperatures around 17 degrees Celsius. This cool, moist regime is precisely what sustains the Araucária mixed forest, which depends on such conditions and cannot regenerate in warmer, drier settings. The combination of cool summers and cold winters gives the park a temperate character quite unlike the tropical forests of most of Brazil, making it a biogeographic island of cool-adapted species within an otherwise warm continent and reinforcing its conservation importance.

The highland plateau of western Santa Catarina was inhabited by Indigenous Kaingang and Xokleng peoples before European colonisation, and these groups relied in part on the pinhão seeds of the Araucária as a vital winter food. From the late nineteenth century, German, Italian, and Polish immigrants settled the region, bringing European farming traditions that rapidly transformed the forests. Timber extraction — especially of the prized Araucária and imbuia — dominated the early twentieth-century economy, with sawmills operating throughout the plateau and dramatically reducing forest cover. Subsistence agriculture, cattle ranching, and later soybean cultivation converted much of what remained of the native forest. The cultural landscape shaped by European immigration now coexists with the ecological imperative to protect the region's surviving forest fragments, of which the national park is among the most important.

Araucárias National Park was established on 19 October 2005 by an unnumbered federal decree (Decreto sem número), as part of a broader expansion of Brazil's federal protected-area network under the Lula administration. ^[1] It was created specifically to protect remnants of the Araucária mixed forest in Santa Catarina, in recognition of the acute threat this biome faces from continuing agricultural and silvicultural expansion. Administered by ICMBio, the park operates under a management plan that addresses the complex task of consolidating its territory by purchasing private lands lying within its boundaries — a process still ongoing. Because the Araucária forest remains underrepresented in Brazil's protected-area system relative to its level of threat, Araucárias National Park is regarded as one of the most important recently created conservation units in southern Brazil. It works in partnership with local municipalities and landowners on sustainable land use in its buffer zones.

The park's foremost attraction is the experience of walking among mature Araucária trees, whose distinctive flat-topped silhouettes crown the skyline and create a forest atmosphere found nowhere else in Brazil. Trails wind through dense mixed forest, past tree ferns and orchid-draped understory, offering excellent birdwatching for species tied to Araucária ecosystems. Waterfalls and stream crossings add scenic variety along the routes. The pinhão harvest season in autumn, roughly April to June, is a particularly vivid time to visit, when seeds rain from the trees and animals gather to feed. Scenic viewpoints over the western Santa Catarina plateau give panoramic vistas across the forest canopy. Because the park is still relatively little known outside the region and remains in the process of consolidating its land base, it offers a quiet, uncrowded experience within a remarkable and threatened ecosystem.

The park's main access points lie near the town of Passos Maia, in the highlands of western Santa Catarina, with Ponte Serrada also close by. The region is served by highways connecting the western plateau to the coast, and nearby towns such as Ponte Serrada and Xanxerê offer accommodation, restaurants, and fuel. The park has basic visitor reception and trail infrastructure. Because it is still consolidating its land base through the purchase of private inholdings, visitor access may be limited in some areas, so contacting the ICMBio park office in advance is advisable to confirm trail conditions and current access. The cool highland climate means warm clothing is useful year-round and rain gear is essential. The park is most easily visited from around October to March, when road conditions are better and temperatures milder, though frost can occur in any season.

Araucárias National Park was created specifically to address the critical status of the Araucária mixed forest, one of South America's most threatened biomes. Key conservation challenges include continuing pressure from agriculture and from exotic pine and eucalyptus plantations in surrounding areas, private inholdings within the park that complicate management, and the slow pace of federal land acquisition. The Araucaria angustifolia is listed as critically endangered globally, and the park plays a vital role in protecting its remaining populations, along with the endangered vinaceous-breasted parrot and other Araucária-dependent species. ^[1] ICMBio collaborates with research institutions on ecological monitoring and restoration. The park's function in protecting the headwaters of the Chapecó and Chapecózinho rivers, which supply downstream agriculture and municipalities, provides an economic rationale for conservation that helps build local support, complemented by environmental education programmes in Passos Maia and Ponte Serrada.