Lab dispersal time Report Example | Topics and Well Written Essays - 1000 words

Dispersal time - Lab Report ExampleAnimal activity is one of the elemental agents bringing seminal fluids to the surface of the soil and burying them. It is, therefore, a profound factor that affects the seed bank contribution to plant recruitment. Also, Earthworms, among animal species are recognized as crucial predators and dispersers of seeds.Seed dispersal is the motion of seeds away from the parent plant. Plants rely on a variety of vectors (living or nonliving) for dispersal (Murray, 2011). The type of the vector obligated for the dispersal of a particular seed is suited to by the general seed characteristics. Common modes of dispersal include gravity, wind, animal, water and ballistic. A particular seed may be acted upon by more than one vector, depending on the conditions and seed type. Exposed seeds on surfaces of soils are vulnerable to extreme contents of moisture and temperature, gum olibanum compromising the viability of seeds. In addition, they are easily detected b y predators (Hirsch, 2012)Researchers have established that secondary dispersal is a critical characteristic that influences seed option (Lal, 2002). Secondary dispersal can be defined as the movement of seeds across, and into, the soil (Forget, 2005). When seeds are placed on soil columns, some will propagate to deeper levels than others, and some will disperse throughout the soil column. In addition to morphology, the role a facilitator species plays affects dispersal. In this case, an earthworm is the facilitator species. The facilitator species activity has a substantial bear on on the soil seed bank dynamics and hence on the possibility of plant recruitment in an ecosystem at large (Allessio, Thomas, & Simpson, 2012).Milkweed, buckthorn, sumac and clotbur seeds have different morphological features Milkweed (Asclepias spp.) seeds are shiny, silky seeds which have snow- white fluffs. They are contained in con-shaped seedpods which crack open when dry to disperse the