Realm
The above-water, soil-and-plant layer of miniBIOTA, ranging from the salt-influenced mangrove forest through the freshwater-adjacent lakeshore to the rain-fed upland meadow. Detritus is the primary energy currency: leaf litter, plant frass, and organic wrack are processed by cockroaches, millipedes, isopods, worms, and crabs across three distinct habitat zones linked by cross-biome movement.
The Terrestrial realm is the above-water, soil-and-plant layer of miniBIOTA: a compressed coastal-to-upland gradient spanning four biomes: Lowland Meadow and Mangrove Forest (fully owned by the Terrestrial realm), and the emergent zones of Marine Shore and Lakeshore (shared boundary biomes where the Terrestrial realm begins above the respective waterlines). It is the most physically diverse realm in the system, ranging from the salt-spray intertidal zone above the Marine Shore waterline through salt-influenced mangrove forest to a freshwater-adjacent shoreline edge and up to a rain-fed upland meadow. The primary energy currency is detritus: leaf litter from mangroves, plant biomass from the meadow, and organic wrack from the marine shoreline are all processed by a layered detritivore community of cockroaches, millipedes, isopods, ants, worms, and crabs. The most distinctive ecological feature of the Terrestrial realm is cross-biome movement: the Mangrove Tree Crab and Ridgeback Sand Grasshopper both range across multiple biomes within the realm, linking what would otherwise be separate food webs.
Terrestrial realms are defined by their air-atmosphere interface, soil-based nutrient cycling, and dependence on precipitation rather than standing water for moisture. Unlike aquatic realms where primary production often occurs in the water column and food webs are shaped by dissolved chemistry, terrestrial food webs are structured by plant tissue (leaves, stems, roots, seeds), the soil beneath them, and the animals that consume, decompose, and recycle that plant material.
In coastal terrestrial systems (the habitat type miniBIOTA most closely resembles), the terrestrial food web is closely linked to marine inputs. Leaf litter from mangroves enters the adjacent saltwater system as detritus. Intertidal organisms carry marine-derived organic matter above the waterline when they graze biofilm on emergent surfaces. Salt spray and tidal influence shape which plant species survive at the waterline and which cannot. This salt-influence gradient is physically present in the miniBIOTA Terrestrial realm: the Mangrove Forest is salt-influenced and marine-adjacent; the Marine Shore's emergent zone is directly above the saltwater; the Lakeshore is freshwater-adjacent and humid; the Lowland Meadow is the driest and most purely terrestrial.
Florida's coastal terrestrial habitats span a similar gradient to miniBIOTA in compressed form: salt flat and beach strand give way to mangrove forest, which transitions to freshwater wetland edge, then to upland coastal scrub or mesic flatwoods. Each zone in this gradient is defined by the degree of saltwater influence (controlled by elevation, tidal flooding frequency, and wind-driven salt spray), the resulting soil chemistry, and the plant community that can tolerate those conditions.
The miniBIOTA Terrestrial realm captures this gradient authentically:
Leaf litter and detritus production: Mangrove trees shed large, waxy leaves at a high rate. This leaf litter is the primary organic input for the Mangrove Forest food web and a key resource for detritivores including Mangrove Tree Crab, Florida Woods Cockroach, isopods, and worms. In the Lowland Meadow, plant die-off and grasshopper frass accumulate as detritus in the organic-rich soil, processed by Smoky Oak Millipedes, isopods, springtails, and cockroaches.
Rain-driven plant growth and succession: The miniBIOTA rain system delivers periodic precipitation to terrestrial biomes. The Lowland Meadow is the primary rain-receiving zone; moisture drains downhill through the Lakeshore to the Freshwater Lake. Rain-driven plant growth fuels the herbivore and detritivore layers. The Mole Cricket's burrowing and grass decline in the Lowland Meadow reflects the sensitivity of terrestrial plant cover to simultaneous stressors: herbivory, soil disturbance, and moisture variation.
Cross-biome movement as an active process: The Mangrove Tree Crab is the clearest example of a species that treats multiple terrestrial biomes as a single home range. Introduced June 4, 2026, the six true Mangrove Tree Crabs were documented feeding on leaves, detritus, and red mangrove in the Marine Shore, moving through the Mangrove Forest, and ranging through the Lakeshore (obs-282, June 9, 2026). The Ridgeback Sand Grasshopper similarly ranges across the Marine Shore, Lakeshore, and Lowland Meadow, grazing Ludwigia at the shoreline, plants at the waterline, and grasses in the meadow. These cross-biome movements carry biomass, frass, and behavioral pressure across what would otherwise be separate food webs.
Predator web activity: The Terrestrial realm supports miniBIOTA's most diverse confirmed predator community: Hentz Striped Scorpion (juveniles documented in Mangrove Forest), Red House Spider (young documented in Mangrove Forest), wolf spider, Common Crypt Ant (Lakeshore alates documented), and ghost ant (Mangrove Forest). This predator community exerts pressure on the detritivore and small invertebrate layer (cockroaches, isopods, beetle larvae) across all terrestrial biomes, though the predator web has not been confirmed as stable or dominant.
Soil building: The Mangrove Forest and Lowland Meadow are both actively building soil organic matter through detritivore processing, root decay, and microbial decomposition. The Mangrove Forest substrate (quartz sand mixed with shell and accumulating organic material) is in early-stage soil development; the Lowland Meadow substrate (dense organic-rich soil with moisture retention) reflects several years of detritivore processing since November 2022.
Herbivory and plant stress: In the Lowland Meadow, grass cover is declining under combined pressure from Mole Cricket burrowing, grasshopper feeding, and cricket herbivory. In the Mangrove Forest, Mangrove Tree Crabs graze red mangrove leaves and litter. In the Marine Shore emergent zone, Mangrove Tree Crab and Mangrove Periwinkle graze biofilm and plant tissue. The Terrestrial realm has more active herbivory relative to its producer base than either the Saltwater or Freshwater realms.
The Lowland Meadow is the driest and highest terrestrial biome, a rain-fed grassland where grasses, Mexican primrose, and creeping beggarweed support a layered community of herbivores (Ridgeback Sand Grasshopper, Autumn Yellow-winged Grasshopper, field crickets, Mole Cricket) and detritivores (Smoky Oak Millipedes, isopods, springtails, cockroaches, worms). The defining ecological tension is grass decline from Mole Cricket burrowing and herbivore pressure, alongside active monitoring of whether field crickets and grasshoppers can establish durable populations. As of June 2026: one female Ridgeback Sand Grasshopper confirmed active, six field crickets documented, one Autumn Yellow-winged Grasshopper newly introduced, one Mole Cricket confirmed by nightly chirping.
Full treatment: Lowland Meadow
The Mangrove Forest is the salt-influenced terrestrial biome positioned between the Marine Shore (below, saltwater-adjacent) and the Lowland Meadow and Lakeshore (above and lateral). Red, black, and white mangroves provide the canopy and leaf litter that fuel a detritivore and predator community of cockroaches, crabs, scorpions, spiders, and ants. The June 2026 species identity correction (historical "Mangrove Tree Crab" records = Humic Marsh Crab; true Mangrove Tree Crabs introduced June 4, 2026) is the key recent identity event. Crab coexistence, Florida Woods Cockroach recruitment, Brazilian Pepper status, and predator web stability are all unresolved.
Full treatment: Mangrove Forest
The Marine Shore physically spans the Saltwater and Terrestrial realms at the waterline. The Terrestrial realm claims the emergent zone above the waterline: Seashore Paspalum and Silverhead as terrestrial plants, Eastern Melampus processing detritus above the waterline, Mangrove Periwinkle grazing biofilm on emergent surfaces, Gulf Marsh Crab and Mottled Shore Crab ranging above the waterline, and Mangrove Tree Crab using the Marine Shore as its primary feeding and climbing zone. The Marine Shore's emergent zone is the salt-influenced outer edge of the Terrestrial realm; the Saltwater realm begins at the waterline below.
Full treatment: Marine Shore
The Lakeshore physically spans the Freshwater and Terrestrial realms at the freshwater shoreline. The Terrestrial realm claims the moist-but-emergent zone above the waterline: Amber Snails grazing on moist surfaces, Common Crypt Ant nesting in moist substrate, Ridgeback Sand Grasshopper grazing Ludwigia at the shoreline, isopods and millipedes processing detritus in the moist organic substrate, and Mangrove Tree Crabs transiting through the Lakeshore as a cross-biome corridor. The Freshwater realm begins at the shoreline moisture threshold below.
Full treatment: Lakeshore
Across all four terrestrial biomes, detritus (dead plant material, frass, shed exoskeletons, fallen leaves, and organic debris) is the primary energy currency driving the food web. The Mangrove Forest produces mangrove leaf litter processed by cockroaches, millipedes, crabs, and worms. The Lowland Meadow accumulates grasshopper frass and plant litter processed by isopods, millipedes, and springtails. The Marine Shore's emergent zone accumulates salt-spray-associated detritus processed by Eastern Melampus. The Lakeshore accumulates shoreline organic matter processed by isopods and blackworms. This detritus pathway runs in parallel across all four biomes and is more reliably documented than the herbivore or predator food web.
No other realm in miniBIOTA has the same density of documented cross-biome movement as the Terrestrial realm:
This cross-biome movement links the Terrestrial realm's biomes into a connected system rather than isolated pockets.
The Terrestrial realm's predator community (Hentz Striped Scorpion, Red House Spider, wolf spider, Common Crypt Ant, ghost ant) operates within and across terrestrial biomes, preying on cockroaches, isopods, beetle larvae, and small invertebrates wherever they are found. The predator web has been documented through reproduction and juvenile signals in the Mangrove Forest and through alate activity in the Lakeshore, but has not been confirmed as a stable, dominant, or measurably controlling community at the realm level.
The Terrestrial realm spans an unusual internal gradient from salt-influenced (Marine Shore emergent zone, Mangrove Forest) to freshwater-adjacent (Lakeshore) to rain-fed and upland (Lowland Meadow). This gradient within a single realm determines which plant species survive where, which detritivores are active in each biome, and which cross-biome species can successfully range the full extent of the Terrestrial realm. The Mangrove Tree Crab's confirmed presence in Marine Shore, Mangrove Forest, and Lakeshore demonstrates that at least some species can cross the full salt-to-fresh gradient within the Terrestrial realm.
The Terrestrial realm and Saltwater realm share the Marine Shore. The interface is the waterline: the Saltwater realm owns the water column and submerged zone; the Terrestrial realm owns the emergent zone and above. The two realms exchange organisms across this line: Gulf Marsh Crab, Mangrove Tree Crab, Eastern Melampus, Mangrove Periwinkle, and Mottled Shore Crab all cross the waterline as part of their normal activity range.
The Terrestrial realm and Freshwater realm share the Lakeshore. The interface is the freshwater shoreline moisture gradient: the Freshwater realm owns the submerged and semi-submerged root zone; the Terrestrial realm owns the moist-but-emergent and dry shoreline above. The two realms exchange organisms through this moisture gradient: Amber Snails, amphipods, and baby crayfish cross between the aquatic edge and the moist terrestrial zone.
Mangrove Forest: Red mangrove, black mangrove, white mangrove (structural trees; primary leaf litter source); coinvine (climbing vine; native Florida coastal legume); Brazilian pepper (invasive; present, uncontrolled).
Marine Shore emergent zone: Seashore Paspalum (salt-tolerant grass at waterline); Silverhead (Blutaparon vermiculare, Florida coastal plant); biofilm on glass and substrate surfaces.
Lakeshore: Ludwigia (semi-aquatic to fully emergent; grazed by Ridgeback Sand Grasshopper); dollarweed (creeping semi-aquatic); shoreline grasses and sedges; algae and biofilm.
Lowland Meadow: Grasses; Mexican primrose; creeping beggarweed (possible nitrogen-fixing legume); broadleaf forbs; moss; surface algae where moisture allows.
Lowland Meadow grass decline (urgent): Grass cover is declining under Mole Cricket burrowing and herbivore pressure. Whether the plant community recovers, shifts to a forb-dominated state, or continues declining is the most visible trajectory question for the Terrestrial realm.
Mangrove Forest predator web (unresolved): Scorpions, spiders, and ants create a dense predator signal in the Mangrove Forest, but none of these lineages have been confirmed as stable, dominant, or continuously present. Their collective presence shapes the cockroach and detritivore community but cannot be claimed as a controlled system.
Brazilian Pepper in Mangrove Forest (ongoing concern): An aggressive Florida invasive, Brazilian Pepper is present in the Mangrove Forest with no approved removal plan. Its trajectory and competitive effect on native mangroves are unresolved and represent a potential long-term structural threat to the Mangrove Forest biome.
Field cricket and grasshopper establishment (long-term watch): Multiple cricket and grasshopper introductions have been made to the Lowland Meadow and Marine Shore, but self-sustaining populations have not been confirmed for any orthopteran species in the Terrestrial realm.
Follow this realm into the habitats that currently define it inside the miniBIOTA biosphere.
