Slide 1
A leaf becomes a trap
A pitcher plant has leaves shaped into traps that hold fluid. Small animals entering a pitcher can become a nutrient source.
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Carnivory supplements the plant's mineral nutrition, especially in nutrient-poor habitats. The green plant still uses photosynthesis to make sugars rather than obtaining all its energy by eating insects.
Slide 2
An easy entrance
A pitcher may lure visitors with nectar and visual cues. Slippery surfaces or inward-pointing features can make escape difficult.
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Pitcher plants are several distinct evolutionary groups. Similar traps do not prove they inherited one identical design from a recent common ancestor; comparable ecological problems can favour similar structures.
Slide 3
Turning prey into nutrients
Captured animals are broken down inside the pitcher. The plant can absorb useful compounds released from the trapped material.
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The digestive process differs among species. Plant enzymes and organisms living in the fluid can contribute in different combinations, so one familiar pitcher is not a blueprint for them all.
Slide 4
The trap has a budget
Building pitchers uses resources that could support other growth. Carnivory is useful when its nutrient gains compensate for those costs.
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Low soil fertility helps explain the strategy, but water and light also matter. A trap is not simply a universal improvement that every plant would benefit from acquiring.
Slide 5
A small habitat within a plant
Some pitchers contain communities of organisms that tolerate their conditions. A structure that traps prey can also become someone else's habitat.
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Those residents may help process material or feed on other occupants. Looking inside the ecological relationships reveals more than a simple picture of one predator consuming every visitor.
Sources
- Australian pitcher plant
Royal Botanic Gardens Kew
- Carnivorous plants
Royal Botanic Gardens Kew