Study Of Dispersal Of Seeds And Fruits Project Pdf
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- Dispersal of Fruits and Seeds (With Diagram)
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The Process of scattering of fruits and seeds to distant places away om their parent is caalled dispersal on dessemination. It provides the new palnts better chances of obtaining water, nutrients, lights and space thereby enabling them to have a better start in Life. The principle agencies that aid in the dispersal of fruits and seeds are wind anemochary , water hydrochory and animals including man zoochory. Besides, some plants show self dispersal by explosive mechanism autochory.
The dispersal through the agency of animals in consideredas the best and most successful method. Dispersal thorugh agency of animals is considered as the best and most successful method. Dispersal of seeds and fruits is quite Intresting subject of natural phenomenon and hence the study of dispersal of seeds by various agencieshas been selected for the present project. Seed survival is often higher away from the parent plant.
This higher survival may result from the actions of density-dependent seed and seedling predators and pathogens, which often target the high concentrations of seeds beneath adults.
Competition with adult plants may also be lower when seeds are transported away from their parent. Seed dispersal also allows plants to reach specific habitats that are favorable for survival, a hypothesis known as directed dispersal. Male bellbirds perch on dead trees in order to attract mates, and often defecate seeds beneath these perches where the seeds have a high chance of survival because of high light conditions and escape from fungal pathogens. In the case of fleshy-fruited plants, seed-dispersal in animal guts endozoochory often enhances the amount, the speed, and the asynchrony of germination, which can have important plant benefits.
Seeds dispersed by ants myrmecochory are not only dispersed short distances but are also buried underground by the ants. These seeds can thus avoid adverse environmental effects such as fire or drought, reach nutrient-rich microsites and survive longer than other seeds. These features are peculiar to myrmecochory, which may thus provide additional benefits not present in other dispersal modes. Finally, at another scale, seed dispersal may allow plants to colonize vacant habitats and even new geographic regions.
Barochory or the plant use of gravity for dispersal is a simple means of achieving seed dispersal. The effect of gravity on heavier fruits causes them to fall from the plant when ripe. Fruits exhibiting this type of dispersal include apples, coconutsand passionfruit and those with harder shells which often roll away from the plant to gain more distance. Gravity dispersal also allows for later transmission by water or animal. Wind dispersal can take on one of two primary forms: seeds can float on the breeze or alternatively, they can flutter to the ground.
An important constraint on wind dispersal is the need for abundant seed production to maximise the likelihood of a seed landing in a site suitable for germination. However, limited wind in its habitat prevents the seeds to successfully disperse away from its parents, resulting in clusters of population. Many aquatic water and some terrestrial ground plant species use hydrochory, or seed dispersal through water. Seeds can travel for extremely long distances, depending on the specific mode of water dispersal.
This is because some fruits are waterproof and can float. The water lily is an example of such a plant. Water lilies' flowers make a fruit that floats in the water for a while and then drops down to the bottom to take root on the floor of the pond.
The seeds of palm trees can also be dispersed by water. If they grow near oceans, the seeds can be transported by ocean currents over long distances, allowing the seeds to be dispersed as far as other continents. The small hooks on the surface of abur enable attachment to animal fur for dispersion. Animals can disperse plant seeds in several ways, all named zoochory. Seeds can be transported on the outside of vertebrate animals mostly mammals , a process known as epizoochory.
Plant species transported externally by animals can have a variety of adaptations for dispersal, including adhesive mucus, and a variety of hooks, spines and barbs. Seed dispersal via ingestion by vertebrate animals mostly birds and mammals , or endozoochory, is the dispersal mechanism for most tree species. Endozoochory is generally a coevolved mutualistic relationship in which a plant surrounds seeds with an edible, nutritious fruit as a good food for animals that consume it.
Birds and mammals are the most important seed dispersers, but a wide variety of other animals, including turtles and fish, can transport viable seeds. Seed predators, which include many rodents such as squirrels and some birds such as jays may also disperse seeds by hoarding the seeds in hidden caches. The seeds in caches are usually well-protected from other seed predators and if left uneaten will grow into new plants.
In addition, rodents may also disperse seeds via seed spitting due to the presence ofsecondary metabolites in ripe fruits. Other types of zoochory are chiropterochory by bats , malacochory by molluscs, mainly terrestrial snails , ornithochory by birds and saurochory by non-bird sauropsids.
Dispersal by humans anthropochory used to be seen as a form of dispersal by animals. Recent research points out that human dispersers differ from animal dispersers by a much higher mobility based on the technical means of human transport. Dispersal by humans on the one hand may act on large geographical scales and lead to invasive species.
On the other hand, dispersal by humans also acts on smaller, regional scales and drives the dynamics of existing biological populations. Humans may disperse seeds by many various means and some surprisingly high distances have been repeatedly measured. Collect different types of seeds and observe their feature carefully, Classify them according to their mode of dispersal. Similarly cut open different types of Fruits, note down the feature of their seeds and classify them according to the mode of dispersal.
Seed dispersal has many consequences for the ecology and evolution of plants. Dispersal is necessary for species migrations, and in recent times dispersal ability is an important factor in whether or not a species transported to a new habitat by humans will become an invasive species. Dispersal is also predicted to play a major role in the origin and maintenance of species diversity. Dispersal of seeds away from the parent organism has a central role in two major theories for how biodiversity is maintained in natural ecosystems..
Seed dispersal is essential in allowing forest migration of flowering plants. In addition, the speed and direction of wind are highly influential in the dispersal process and in turn the deposition patterns of floating seeds in the stagnant water bodies.
The transportation of seeds is led by the wind direction. This effects colonization situated on the banks of a river or to wetlands adjacent to streams relative to the distinct wind directions. The wind dispersal process can also effect connections between water bodies. Essentially, wind plays a larger role in the dispersal of waterborne seeds in a short period of time, days and seasons, but the ecological process allows the process to become balanced throughout a time period of several years.
The time period of which the dispersal occurs is essential when considering the consequences of wind on the ecological process. Dispersal of Seeds Published on Mar 20,
study of dispersal of seeds and fruits project pdf
In this article we will discuss about the dispersal of fruits and seeds:- 1. Dispersal by Wind 2. Dispersal by Animals 3. Dispersal by Explosive Mechanism 4. Dispersal by Water.
Dispersal of seeds away from the parent organism has a central role in two major theories for how biodiversity is maintained in natural ecosystems.. Seed dispersal is essential in allowing forest migration of flowering plants. The pupils can choose names for each of the dispersal groups - e. Several different vectors--wind, water, and animals --are involved in fruit and seed dispersal. This study found evidence that fruit and seed traits coevolved in ways that influence dispersal and possibly establishment. Without seed dispersal, the chances of a plant species reproducing regularly are greatly reduced.
20+ million members; + million publications; k+ research projects 1Mediterranean Institute of Advanced Studies (CSIC-UIB), Terrestrial Ecology When fruits and seeds are dispersed by a mechanism other than that to which they.
Dispersal of Fruits and Seeds (With Diagram)
Seed , the characteristic reproductive body of both angiosperms flowering plants and gymnosperms e. Essentially, a seed consists of a miniature undeveloped plant the embryo , which, alone or in the company of stored food for its early development after germination , is surrounded by a protective coat the testa. Frequently small in size and making negligible demands upon their environment , seeds are eminently suited to perform a wide variety of functions the relationships of which are not always obvious: multiplication, perennation surviving seasons of stress such as winter , dormancy a state of arrested development , and dispersal. The latter factor provides ample opportunity for the development of adaptations for dispersal, such as plumes for wind dispersal, barbs, and others.
These seeds are small and light and can float in water or even dispersal of seeds may be done by rain water.
The fruit has a single purpose: seed dispersal. Seeds contained within fruits need to be dispersed far from the mother plant, so they may find favorable and less competitive conditions in which to germinate and grow. Modifications in seed structure, composition, and size help in dispersal. Wind-dispersed fruit are lightweight and may have wing-like appendages that allow them to be carried by the wind.
If they grow near oceans, the seeds can be transported by ocean currents over long distances, allowing the seeds to be dispersed as far as other continents. The effect of gravity on heavier fruits causes them to fall from the plant when ripe. This activity helps pupils at KS2 to identify the main characteristics of fruits and seeds and to group them according to their dispersal mechanism. Essentially, wind plays a larger role in the dispersal of waterborne seeds in a short period of time, days and seasons, but the ecological process allows the process to become balanced throughout a time period of several years. The following four participatory group projects will assist your middle schoolers as they learn the five major methods of seed dispersal. Seeds that are not consumed spread via the primary dispersal mechanism e.
Constructing a key to fruit dispersal mechanisms. Explosions in fruits literally refer to bursting with all its energy. It provides the new palnts better chances of obtaining water, nutrients, lights and space thereby enabling them to have a better start in Life. The following four participatory group projects will assist your middle schoolers as they learn the five major methods of seed dispersal. The seeds of the orchid plant, dandelions, swan plants, cottonwood tree, hornbeam, ash, cattail, puya, willow herb, are all examples of plants whose seed are dispersed by the wind.
km). Some seeds develop into Discuss with the pupils how these plants disperse their fruits and seeds, highlighting the common features of each dispersal.
Skip to content. All Homes Search Contact. The ovule develops into a seed and the ovary wall can become fleshy such as berries, apricots, dates and drupes. The seeds falling directly under the mother plant have to germinate and develop under limited food supply and space. This key, together with the worksheets that contributed to it, gives a useful example of a possible outcome of this activity.
The Process of scattering of fruits and seeds to distant places away om their parent is caalled dispersal on dessemination. It provides the new palnts better chances of obtaining water, nutrients, lights and space thereby enabling them to have a better start in Life.