Rondinha

Parque Estadual do Papagaio-Charão (formerly Parque Estadual de Rondinha, renamed in 2010 to honor the threatened papagaio-charão parrot) is a protected area located in the Planalto Médio region of Rio Grande do Sul, Brazil, in the municipality of Sarandi. The park preserves approximately 1,000 hectares of Mixed Ombrophilous Forest — Araucaria-dominated Atlantic Forest — in a region where the native forest cover has been extensively cleared for soy cultivation, wheat farming, and cattle ranching. ^[1] Created by State Decree No. 30,645 on April 22, 1982, the park protects an important fragment of the contact ecosystem between savanna (campo) and Araucaria forest, a transition type now extremely rare in the Planalto Médio. It is a critical biological refuge for the papagaio-charão (Amazona pretrei) and other forest-dependent species.

Rondinha's wildlife reflects the pressures of isolation in an agricultural matrix but retains a diversity of forest-dependent species. The park's namesake species, the papagaio-charão (Amazona pretrei), is a threatened parrot found in the Araucaria forests of southern Brazil. The Vinaceous-breasted amazon and other forest birds are present. Pumas are documented at low densities as apex predators. The hairy-legged vampire bat (Diphylla ecaudata) and several fruit bat species represent important pollinator and seed disperser guilds. Brown howler monkeys and capuchin monkeys (Sapajus nigritus) are present and serve as indicators of forest quality. Ocelots and jaguarundis are secretive predators in the understory. Amphibian diversity is closely tied to the park's streams and vernal pools. ^[1]

The park's forest is a classic Mixed Ombrophilous Forest (Floresta Ombrófila Mista) with Araucaria angustifolia emergents rising above a mixed hardwood canopy dominated by imbuia (Ocotea porosa), angico-vermelho (Parapiptadenia rigida), and açoita-cavalo (Luehea divaricata). The understory includes native yerba mate (Ilex paraguariensis), canjiquinha (Matayba elaeagnoides), and numerous Myrtaceae shrubs and trees. ^[1] Approximately 17% of the park is classified as grassland (Estepe) interspersed with the forest, reflecting the savanna-Araucaria transition that defines the park's ecological character. The park also contains important springs of the Baios and Mendes streams, which feed into the Rio Uruguai watershed. The forest interior species composition likely reflects some legacy of past selective logging of high-value timber species including imbuia and cedro.

Rondinha sits on the Planalto Médio, the central portion of the Serra Geral basaltic plateau, characterized by gently rolling terrain underlain by horizontal lava flows from the Cretaceous Paraná-Etendeka volcanic event, approximately 130 million years ago. The basalt forms the parent material for the dark latosols (Oxisols and Ultisols) that cover the plateau and are among the most fertile soils in southern Brazil — the primary reason this region was cleared for agriculture. Stream erosion has incised V-shaped valleys into the plateau, exposing basalt in riverbed outcrops and creating habitat diversity within an otherwise uniform terrain. There are no dramatic geological formations within the park, but the quality and thickness of the forest soil organic layer reflects centuries of forest litter accumulation.

The Planalto Médio experiences a humid subtropical climate transitional between Cfa and Cfb depending on elevation. Mean annual temperatures in the Sarandi municipality range between 17°C and 19°C. Winters are cool, with frosts occurring from May through August, sometimes producing snowfall in years with particularly strong polar air intrusions. Summers are warm and humid, with frequent afternoon convective thunderstorms providing the bulk of the annual rainfall. Annual precipitation ranges from 1,600 to 1,900 mm, generally well-distributed without a pronounced dry season. The basaltic plateau creates conditions favorable for Araucaria and the associated Mixed Ombrophilous Forest community, which require the cool winters and adequate rainfall characteristic of this climate zone.

The Planalto Médio of Rio Grande do Sul was settled by European immigrants — predominantly Germans, Italians, and their descendants — who pushed northward from the original colonial nuclei in the Serra Gaúcha throughout the late nineteenth and early twentieth centuries. The forest of the central plateau was cleared systematically for subsistence and later commercial agriculture, with the timber from araucaria, imbuia, and cedro driving a regional lumber economy. The town of Sarandi itself grew as a service center for the agricultural community on the plateau. Indigenous Kaingang communities had inhabited the plateau for centuries before colonization, using its resources and defending their territory through multiple conflicts with expanding frontier settlers in the late nineteenth century.

Parque Estadual do Papagaio-Charão was created by State Decree No. 30,645 on April 22, 1982, as the Parque Florestal Estadual de Rondinha, to protect one of the few remaining intact forest patches on the Planalto Médio. ^[1] In 2010, the park was renamed Parque Estadual do Papagaio-Charão by State Decree No. 47,168, honoring the threatened parrot species that is one of the park's flagship conservation targets. SEMA-RS manages the park, which serves as both a biological reservoir and a site for environmental education for rural communities in the surrounding municipalities. The Consultative Council has been active since 2011, and land regularization is complete. A management plan was under development as of recent records.

The park offers trails through native Araucaria forest, a landscape type increasingly rare on the Planalto Médio. The immersive experience of a closed-canopy forest surrounded by agriculture highlights the contrast between the preserved area and its converted surroundings, a powerful environmental education message. Birdwatching in the forest interior reveals species that have disappeared from adjacent farmland, with the papagaio-charão parrot a sought-after target. Stream trails lead to small waterfalls and pools within the park, providing natural swimming opportunities during summer. The seasonal pinhão harvest period in autumn offers a cultural connection to indigenous and colonial traditions of collecting Araucaria seeds. The park collaborates with local schools for environmental education field trips.

Rondinha is located in the Planalto Médio of Rio Grande do Sul, in the municipality of Sarandi, accessible from Passo Fundo — the regional hub — via state highways across the plateau. Passo Fundo, approximately 40 to 60 km from the park, provides the nearest concentration of accommodation, restaurants, and services. The city has good road connections to Porto Alegre (approximately 280 km south) and Caxias do Sul. Public visitation had not yet been formally implemented as of recent records; visits are best arranged in advance through SEMA-RS or the park administration to confirm access and guided visit availability. ^[1] A private vehicle is the most practical means of reaching the park.

The park faces the challenge of biological isolation typical of forest remnants embedded in intensive agricultural landscapes. As a small patch surrounded by cropland, it is susceptible to edge effects including wind damage, desiccation of forest margins, and invasion by exotic plant species from adjacent areas. The absence of wildlife corridors to other forest patches limits genetic exchange and recolonization after local species extinctions. Threats include illegal hunting, particularly of larger mammals, and the risk of agricultural chemical drift from adjacent fields. Conservation strategies promoted by SEMA-RS include incentivizing farmers in the region to maintain legal riparian forest buffers (Áreas de Preservação Permanente), which could eventually form corridor networks linking isolated remnants like this park to larger protected areas further from the agricultural frontier. ^[1]