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Different Types of Seed Dispersal

Updated: Oct 17, 2023

Plants, trees and vegetation are immobilized and anchored by roots. Unlike animals, plants and trees can't "get up and go" and physically travel to other regions. Because of this, Mother Nature has developed creative methods to help ensure the healthy continuity of plant and tree species. Seeds help to fill this gap in movement by dispersing to more favorable environments. Overcrowding isn’t sustainable and dispersing seeds farther away from the parent plant (to sites where more suitable conditions exist) can reduce conspecific competition for water, sunlight, nutrients, and space.

The dispersal of seeds can change the number of plants in a given community allowing different plant species to move and colonize new habitats. There are a variety of different types of seed dispersal methods which help to spread the plant species to other communities. Different Types of Seed Dispersal Gravity: Where the seeds simply fall to the ground, like apples, black locust tree seed pods, common mullein and teasel seeds.

Animals: Wildlife will help to spread seeds, like forgotten walnuts and acorns previously stored for winter. Birds also eat the fruit of plants such as wild grape, Virginia creeper, European buckthorn and staghorn sumac, which disperses seeds in their droppings after digestion.

Hitch Hiking: Some plants have also developed fur and feather hitch-hiking adaptations like hooks, barbs and spines, displayed by species such as common burdock, devil’s beggar-tick and enchanter’s nightshade.

Dehiscence: Ballistic seed dispersal is another adaptation to release seeds through explosive dehiscence; a noteworthy example is the common jewelweed which rapidly releases a seed when touched. Garlic mustard silique and common milkweed follicles also undergo dehiscence and open at seed maturity, though milkweed also develops white hairs that allow for wind dispersal as well.

Wind: Other species with wind capabilities are sow thistle, Canada goldenrod, and maple and ash samara. Common cattail also disperses well in the wind and in the water.

Lastly, humans play a large role in seed dispersal, with many activities like farming, gardening, recreation, and transportation causing widespread deliberate and accidental introductions and cultivations.

Different types of seed dispersal

1) Gravity – Seed falls to the ground;

2) Animal and wildlife seed dispersal;

3) Fur and feather hitch hiking adaptations such as hooks, barbs spines;

4) Ballistic seed dispersal that releases seeds through explosive dehiscence;

5) Wind seed dispersal;

6) Human seed dispersal through activities such as farming, gardening, recreation, and transportation

Photo examples of different types of seed dispersal

1) Gravity seed dispersal

apple from an apple tree
An apple that has fallen from the tree - How it disperses it's seeds

The common Mullein - CIPS
The seeds drop from the Common Mullein

teasel plant
Seeds from the teasel plant will fall to the ground

oak tree acorns - CIPS
Oak tree acorns that have fallen to the ground

black walnuts - CIPS
Black walnuts that have fallen to the ground

2) Animal Transportation, Consumption and Seed Dispersal

Wild grapes - CIPS
Wild grapes will be eaten by animals for seed dispersal
virginia creeper
The grapes will be eaten by wildlife - Seed dispersal

staghorn sumac - CIPS
How seeds disperse through animal consumption

European Buckthorn - CIPS
Wildlife will consume the grapes for seed dispersion

3) Fur and Feather Hitch Hiking Adaptations (Such as Hooks, Barbs & Spines)

Common Burdock - CIPS
The burs from the Common Burdock will stick to anything it touches allowing for seed dispersion

Devil's Beggar-Tick - CIPS
The Devil's Beggar-Tick will disperse it's seeds by attaching to anything that touches it's hooks and tiny barbs

Enchanter's Nightshade - CIPS
How the Enchanter's Nightshade disperses it's seeds

Enchanter's Nightshade seed dispersal - CIPS
The tiny hooks and barbs of the Enchanter's Nightshade and how it disperses it's seeds

4) Ballistic Seed Dispersal That Releases Seeds Through Explosive Dehiscence

Common Jewelweed - CIPS
When touched the Common Jewelweed will disperse it's seeds

Common Milkweed seeds - CIPS
The seeds of the Common Milkweed

Garlic Mustard plants seeds - CIPS
The seeds from the Garlic Mustard plant

5) Seed Dispersal by Wind

Norway Maple Samara seeds - CIPS
Seeds from the Norway Maple Samara that have blown to the ground

Common Cattail - CIPS
The wind will blow the seeds from the Common Cattail to other areas for new growth

Canada Goldenrod plant - CIPS
The Canada Goldenrod plant ready for wind dispersion for it's seeds

Sow Thistle Plant seeds - CIPS
The seeds from the Sow Thistle plant

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1 comentario

07 mar

very nice article

pictures were very useful

attractive 🎇❣️

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