Seed Dispersal by Animal and Birds . Introduction. 1. The state of a population of a given species, for example, an increase in number that causes greater population density, stimulates the dispersal of the animals. Dispersal "strategies" for plants Resistant seeds, spores (floating on salt water) Tiny size for distant transport by wind hitchhikers (phoresy): hooks, hairs for transport by animals animal hitchhikers: flower mites in hummingbird noses dispersed definition: 1. past simple and past participle of disperse 2. to spread across or move away over a large area…. Most people chose this as the best definition of dispersal: The act or process of dis... See the dictionary meaning, pronunciation, and sentence examples. Plants have limited mobility and rely upon a variety of dispersal vectors to transport their propagules, including both abiotic vectors such as the wind and living vectors like birds.Seeds can be dispersed away from the parent plant individually or collectively, as well as dispersed in both space and time. Dispersal, the movement from a natal/breeding site to another breeding site, is one of the most fundamental life-history traits that affects processes as diverse as the dynamics and evolution of spatially structured populations, gene flow, species' distributions and species' ability to track favourable environmental conditions (Clobert et al. There are different ways in which animals and birds disperse the seeds. The dispersal of animals is usually linked with a change in abiotic and biotic environmental conditions and in the population size of the animals. Dispersal in Ecology : Definition & Explanation Optimal Foraging Theory & Its Impact on Animal Behavior Dispersal may arise within a population for several reasons, the evolution of which is well-studied and experimentally proven (Clobert et al., 2001). Dispersal definition: Dispersal is the spreading of things over a wide area. Learn more. Dispersal is when a plant, animal, or other organism moves from where it was created to another site, usually for breeding or growing purposes. Birds often fly far away from the parent plant and disperse the seeds in their droppings. Over 70% of plants in our woody forests in New Zealand have fleshy fruit that is eaten by birds. There are two types of dispersal: active and passive. They eat the entire fruit and only the juicy part is digested by their system and the seed are excreted out in the form of their dropping, which forms into new plants. Animal dispersal. 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