Bromeliads Honor

Nature Study

Requirements

1. What are the main characteristics of bromeliads?

   Answer: Bromeliads are monocot plants with long, rigid leaves arranged in a rosette (forming a central "cup" that accumulates water). They have mainly anchoring roots (which do not absorb nutrients from the soil). Most are epiphytic (living on trees without parasitizing them) or rupicolous (on rocks). They have showy colored flowers and produce bracts to attract pollinators such as hummingbirds. — The bromeliads' "cup" forms a unique microecosystem — it accumulates rainwater where mosquito larvae, frogs, and even shrimp live; the pineapple (Ananas comosus) is the best-known and only commercial bromeliad; the family has 3,500 species, but most are endemic to the Americas; a Brazilian study published by the IBP of the University of São Paulo, Brazilian today in force.

2. Why did bromeliads receive that name and what were they called?

   Answer: The name "bromeliad" honors the Swedish botanist Olof Bromelius, who described the family in the 17th century. Before that name, they were called by Native Americans by regional names (gravatá, caraguatá, ananás in Tupi-Guarani). They were described in the book "Bromelia" by the Frenchman Charles Plumier in 1703, dedicated in honor of his colleague Bromelius. — Bromelius (1639-1705) was a physician and botanist from Stockholm; Plumier traveled through the Caribbean and described about 1,000 new species; ananás comes from the Tupi naná = "fragrant fruit"; Carolus Linnaeus (Linnaeus) officialized Bromelia in 1753 in Systema Naturae — the basis of modern taxonomy still used today in all Brazilian universities in force.

3. What family do bromeliads belong to?

   Answer: Bromeliads belong to the family Bromeliaceae ("Bromeliads"), classified in the order Poales (the same as corn, wheat and grasses). It has 3,500 species in 75 genera, almost all endemic to the Americas (from the southern USA to Argentina). Brazil holds 40% of the species — the greatest diversity in the world, with hotspots in the Atlantic Forest and the Amazon. — Bromeliaceae is one of the best-studied families in Brazil by the Institute of Botany of São Paulo; the only species outside the Americas is Pitcairnia feliciana from African Guinea (an evolutionary curiosity); pineapple (Ananas comosus), tillandsia (air plant) and neoregelia are well-known genera — popularized in the book "Bromélias" by Carl Mez, still in effect today.

4. Make a drawing of a bromeliad indicating its parts.

   Answer: You draw a bromeliad identifying: a rosette of leaves (forming a central cup), the water cup (with larvae and debris), the inflorescence (a stalk with flowers and colored bracts), small fruits (at the base of the flowers), anchoring roots (attached to a tree or rock) and stolons (offshoots that produce lateral pups for vegetative reproduction). — Colored bracts (red, yellow) are modified leaves that attract pollinators; the true flowers are small at the center; stolons produce "pups" identical to the mother plant (clones); roots serve only to anchor — nutrition comes from the central cup (water + debris decomposed by bacteria); per the Brazilian flora standard of IBGE, in effect.

5. Can epiphytic bromeliads be considered parasites? Explain.

   Answer: No, epiphytic bromeliads are not parasites. They only use trees as physical support to reach more light, without taking nutrients or harming the host plant. Their roots only anchor; they do not absorb from the tree. Nutrients come from rainwater, dust and debris accumulated in the central cup, decomposed by bacteria and fungi from the environment. — Parasites (such as mistletoe) suck sap and sicken the host; epiphytes are commensals (a neutral or positive ecological relationship); an excess of bromeliads can weigh down and break branches, but this is not parasitism; the ecological classification was formalized by Schimper in 1898 — the basis of modern botany taught today at the IBP of Brazil's USP, in effect.

6. What is the habitat of bromeliads? Which continents are bromeliads native to?

   Answer: Bromeliads inhabit tropical forests, the Atlantic Forest, the cerrado, the restinga and even arid deserts. Some are epiphytes (on trees), others are rupicolous (on rocks) or terrestrial (in the soil). They are native to the Americas (from the southern USA to Argentina). The only exception is Pitcairnia feliciana, found in West Africa — a well-known evolutionary anomaly in botany. — The Brazilian Atlantic Forest has about 800 endemic species; the cerrado and caatinga have bromeliads adapted to drought; tillandsias of the Atacama live only on fog; Pitcairnia feliciana was described in 1937 and no one knows for sure how it reached Africa — probably by accidental dispersal — a worldwide botanical mystery, in effect today.

7. Give examples of bromeliad species:
   • Epiphytes;
   • Lithophytes;
   • Terrestrial;
   • Ornamental;
   • Carnivorous;
   • Edible;
   • Medicinal.

   Answer: 1) Epiphytes: live on other plants (on trunks and branches) without parasitizing them; examples are Spanish moss (Tillandsia usneoides) and Tillandsia cyanea. 2) Rupestrine: grow on rocks and stones; an example is the imperial bromeliad (Alcantarea imperialis), common on rocky outcrops. 3) Terrestrial: root directly in the soil; examples are the pineapple (Ananas comosus) and the gravatá (Bromelia balansae). 4) Ornamental: cultivated for the beauty of their leaves and flowers; examples are the neoregelia (reddish center), the guzmania (showy bracts), and Tillandsia cyanea. 5) Carnivorous: most bromeliads are NOT carnivorous; the accepted example is Brocchinia reducta, which attracts and digests insects in its central tank, behaving like a carnivorous plant. 6) Edible: have parts that serve as food; the classic example is the pineapple (Ananas comosus), whose fruit is edible. 7) Medicinal: used in folk medicine; the pineapple (Ananas comosus) provides bromelain, an enzyme with digestive and anti-inflammatory uses, being the best-known medicinal bromeliad. — The pineapple has been cultivated worldwide since the Incas; Spanish moss grows on power lines in southern Brazil; Alcantarea is endemic to Rio de Janeiro and reaches 3m in height with a yellow inflorescence; neoregelias and guzmanias are the best-selling bromeliads in flower shops — care is to water through the central cup, according to Brazilian botany in force today.

8. What is the relationship between bromeliads and mosquitoes, and between bromeliads and the frogs that live in forests/woods?

   Answer: The bromeliad's central cup stores standing water — it becomes an ideal nursery for mosquito larvae, including Aedes aegypti (dengue, zika). Anurans (toads, tree frogs) also use the cup to lay their eggs, and the tadpoles grow there. There is a balance: tadpoles eat mosquito larvae, naturally controlling their proliferation in preserved environments. — Bromeliad tree frogs (Phyllodytes) live only in bromeliads — a unique evolutionary adaptation; Brazilian campaigns call for puncturing urban bromeliads to prevent dengue, but this destroys the natural ecosystem; tadpoles eat 100 larvae/day according to Fiocruz; the balance only works in preserved forest — a principle of urban ecology by Brazil's USP, in effect today.

9. Why is the imperial bromeliad (Alcantarea imperialis) so resilient, to the point of surviving even if its roots are cut?

   Answer: The imperial bromeliad survives without roots because its thick leaves and central cup store a large amount of water and nutrients (rain, debris). It is a CAM plant (crassulacean acid metabolism) and saves water to the maximum. With scleromorphic (rigid) leaves, it withstands strong sun and prolonged drought — adapted to live on the inhospitable rocks of Rio's coastal outcrops. — Alcantarea imperialis grows on granitic outcrops in Rio (Sugarloaf Mountain) — an extreme environment of sun, wind and little water; CAM opens its stomata only at night (saving water); the species is endemic to the Atlantic Forest and a symbol of Rio; it can live 30 years and reach 3 m with a 1 m inflorescence — described by Mez in 1894, Brazilian, in effect.

10. What size can the largest bromeliad in the world reach?

    Answer: The largest bromeliad in the world is Puya raimondii, of the Andean altiplano (Peru and Bolivia). It can reach 10 meters in height when it flowers, with a giant inflorescence of 4 meters containing about 8,000 flowers. It lives 80-150 years before flowering for the first time (then it dies). It is called the "queen of the Andes" because of its impressive size. — Puya raimondii was so named by the German botanist Hermann Harms in 1928, in honor of the Italian naturalist Antonio Raimondi (who had recorded it in Peru in the 19th century); it is a distant relative of the pineapple; it lives at about 4,000 m of altitude on the Peruvian-Bolivian altiplano; it flowers only once (monocarpic) and then dies; it is threatened with extinction and is protected in national parks such as Huascarán, in Peru.

11. What are the main pollinators of bromeliads?

    Answer: Main pollinators: hummingbirds (attracted by long, red, tubular flowers), bats (in nocturnal species with white, fragrant flowers), bees and butterflies (in smaller flowers), and some species pollinated by the wind. Each bromeliad evolved specific adaptations to attract its main pollinator — a classic coevolutionary relationship. — Hummingbirds are the main pollinators in 80% of neotropical species; their long beak fits perfectly into tubular flowers; bats pollinate nocturnal species such as Werauhia gladioliflora; bumblebees have a short tongue for smaller flowers; the study by Almeida-Neto (2014) in the Atlantic Forest documents this coevolution over millions of years, in effect.

12. What are the main problems in growing bromeliads and how can they be solved?

    Answer: Common problems: scale insects and aphids (use water and mild soap or neem oil); root rot (water only the cup, not the soil); yellowed leaves (too much strong sun — move to partial shade); a dry cup (fill it with rainwater weekly); lack of flowering (it needs ethylene — place a ripe apple on the bromeliad inside a plastic bag). — Scale insects are the main pests — they suck sap and sicken the plant; ethylene (a natural gas produced by ripe fruit) induces flowering in adult bromeliads; tap water can accumulate chlorine and calcium; the apple method was discovered in the 1950s and is used commercially in Brazilian production of bromeliads for sale, in effect.

13. Why should bromeliads not be collected in the wild? What is the ecological importance of bromeliads?

    Answer: Do not collect them, because it destroys native populations (many species are threatened), unbalances ecosystems and is an environmental crime (Law 9,605/98). Importance: the central cup forms a micro-ecosystem (larvae, frogs, insects), helps in water cycling, feeds hummingbirds and bats, and indicates the health of the forest. Grow them from pups of other legally cultivated bromeliads. — Brazil has 200+ threatened species in ICMBio's Red Book; Law 9,605/98 provides for detention of 6 months to 1 year for illegal collection; bromeliads are biodiversity "hot spots" — a single one can shelter 50 species of invertebrates; legal nurseries such as the Bromelário Imperial in Petrópolis sell certified seedlings for Brazilian botany, in effect today.

14. Make a collection of photos of at least 15 different species of bromeliads, with their respective common and scientific names.

    Answer: You photograph or collect images of 15 species, identifying each one: pineapple (Ananas comosus), gravatá (Bromelia balansae), old man's beard (Tillandsia usneoides), imperial bromeliad (Alcantarea imperialis), neoregelia, guzmania, vriesea, aechmea, billbergia, dyckia, hechtia, fascicularia, cryptanthus, pitcairnia, puya. Present them in a printed or digital album with captions. — There are 15 main genera of the family Bromeliaceae; each has several species; identification is by flowers, leaf shape and colors; apps such as PlantNet help with identification; the book "Bromélias do Brasil" by Otto Fittkau is a photographic reference; the collection standard follows the Manual of Embrapa Genetic Resources and Biotechnology, Brazilian, in effect today.