Daphnia sp.

Daphnia

A small freshwater microcrustacean, likely Daphnia ambigua, introduced from a warm, shallow Florida wetland on April 8, 2026. In miniBIOTA, this population is being tracked as a suspended-algae grazer and a possible bridge between microscopic primary production and larger consumers such as ghost shrimp and crayfish. Daphnia remained visible through April 13 as the lake began clearing, but long-term establishment is still unresolved under predation, oxygen, and temperature pressure.

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Identity & Origin +

Common Name: Daphnia
Scientific Name: Daphnia sp.
Realm: Freshwater
Biome: Freshwater Lake
Introduction Method: Wild collected
Date First Introduced: April 08, 2026
Source / Origin: Wild-collected trail-pool sample

Population Dynamics +

Current Estimated Population: Introduced in quantity and visible through the early post-introduction window; current abundance is unresolved.
Population Status: Uncertain
Carrying Capacity Status: Under Evaluation
Date Last Observed: April 13, 2026

Section Notes

Wild-collected Daphnia sp. were introduced to the Freshwater Lake on 2026-04-08. Living individuals remained visible through 2026-04-13, confirming short-term persistence; establishment, reproduction, and durable clearing remain unresolved.

Trophic Ecology +

Trophic Level: Primary Consumer
Feeding Niche / Method: Filter feeder and suspended-algae grazer
Dietary Inputs: Suspended algae, phytoplankton, microbes, and fine organic particles
Known Predators: Ghost Shrimp (zoea and adults), crayfish, water beetles, and other predatory aquatic insects.

Section Notes

Trophic classification is Primary Consumer. Food-web role: Suspended-algae plankton grazer. Feeding method: Filter feeder and suspended-algae grazer. Dietary inputs: Suspended algae, phytoplankton, microbes, and fine organic particles

Environmental Tolerances +

Temperature Range: Subtropical (typically 65°F to 82°F / 18°C to 28°C)
pH Range: Standard Freshwater (typically pH 6.8 to 7.8)
Lighting Requirements: Moderate (phototactic, migrates vertically in response to light levels)
Flow / Aeration Preference: Low flow to Still water (prefers calm lake water column)

Section Notes

Adapted to highly fluctuating temporary wetlands. Tolerant of moderate organic loading and low oxygen but highly sensitive to rapid temperature shocks or high water movement.

Life Cycle & Reproduction +

Expected Lifespan: 30–50 days
Reproductive Strategy: Parthenogenesis (asexual reproduction via cloning under optimal conditions; switches to sexual reproduction and resting eggs/ephippia under stress)
System Reproduction Status: Not confirmed; no reproduction claim is made from the current reviewed evidence.
Growth Rate: Fast (can mature in 5–10 days, hatching a clutch of clones every few days)

Section Notes

Under optimal conditions, females reproduce by parthenogenesis, producing batches of identical female clones in their brood chamber. Under environmental stress (e.g., crowding, cold, food limitation), they produce males and switch to sexual reproduction, forming a protective dark saddle (ephippium) that houses highly resilient resting eggs that can survive desiccation and freezing.

Ecological Role & Symbiosis +

Ecological Role: Microcrustacean grazer and food-web bridge
Symbiotic Relationships: Forms a crucial grazing mutualism with submerged aquatic plants, which provide physical shelter from visual predators in exchange for water-clearing filtration services.
Microhabitat Preference: Open water column, glass and plant surfaces, and sheltered vegetated margins within the Freshwater Lake biome.

Section Notes

Serves as a primary filter feeder that consumes suspended phytoplankton, preventing algae blooms and maintaining high water column clarity. Acting as a key ecological bridge, they convert primary algal energy into highly nutritious crustacean biomass for larger carnivores.

Freshwater

A still freshwater habitat where submerged plants, tiny grazers, shrimp, snails, and crayfish are rebuilding the lake's food web after fish pressure changed.

Daphnia

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Section Notes

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Biomes This Species Lives In

Freshwater Lake

Fish removal reopens the lake food web

Daphnia Need Shelter Before They Can Control Algae

Related Subjects

Daphnia

Visual Data Unavailable

Biomes This Species Lives In

Fish removal reopens the lake food web

Daphnia Need Shelter Before They Can Control Algae

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