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Ecology Lab Report: Discussing The 3 Things That Ecologists Do: Mark, Recapture, Release, Survivorship Curves And Food Web.

1071 words - 4 pages

Ecology is the study of organisms and their relationship with their surroundings. It is the study of the interaction between the many different members of a species with each other, with other organisms, and with the chemical and the physical environment. A first step to understanding individual animals, and in turn populations of animals, is to understand the relationship they have with their environment. A species is all the organisms of a group that reproduce and produce fertile offspring in nature. Species are divided up into populations that are separated from one another by a physical or chemical barrier. The populations of different species that live and act together form a community. The community of organisms and their environment form an ecosystem. Organisms play different important roles in an ecosystem.Three experiments that simulate the different themes that are involved in ecology are Mark, Recapture and Release, Survivorship Curves and Food web. Mark, Release and Recapture are methods used by ecologists to study a certain population of animals in an ecosystem. An ecosystem is a system whose members benefit from each other's participation by symbiotic relationships. Survivorship curves tell us something about how long individuals survive in a population. There are three types of survivorship curves; Type I, II, and III. Type I survivorship curves are for species that have a high survival rate of the young, live out most of their expected life span and die in old age. Type II survivorship curves are for species that have a relatively constant death rate throughout their life span. Death could be due to hunting or diseases. Type III survivorship curves are found in species that have many young, most of which die very early in their life. In the following experiment a survivorship curve is simulated for a Type III Species.Food webs express the feeding relationships between species in a community. They give a graphic description of the transfer of material and energy from one species to another within an ecosystem. Organisms are connected to the organisms they consume by arrows representing the direction of biomass transfer. The trophic level is the position that an organism occupies in a food chain; what it eats and what is eating it. Producers (first trophic level) are mostly photosynthetic autotrophs (self feeders), such as plants and cyanobacteria. The next organisms are consumers; they eat other organisms. There are 2 kinds of consumers: Primary consumers (second trophic level) are herbivores and secondary consumers (third trophic level), who eat primary consumers.Materials for Mark, Recapture and ReleaseThe materials used in this experiment are:•A sample of at least 3 red beans.•A Sample of at least 100 white beans.•A container to hold the beans.Method1.Prepare the materials needed for this lab.2.Remove 100 white beans and substitute 100 red beans. This is the marking process of the experiment.3.Mix the beans...

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