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Topics: Biodiversity, Ecology, Species Pages: 5 (1603 words) Published: January 28, 2014


What is biodiversity? Why does it change? Why is it important to conserve it?

INTRODUCTION

Presently these days, lots of people live in urban areas. In this case they are separated from the environment. But another important reason why humans will always depend on the environment is because our lives depend on biodiversity. Meaning that we get clothing, medicines, food and furniture from other species. Just because that people rely on biodiversity they have to conserve biodiversity and can save it for future generations (www.scienceclarified.com). But before knowing all the damage this can cause to us, firstly we should know what biodiversity is. Why does it change? Why we have to conserve biodiversity? The aim of this essay is to answer these three questions, so in this paper I will try analyze most important things about biodiversity. MAIN ARGUMENTS

The definition of biodiversity has many different connotations, description of species composition interactions between organisms and their environment (Orians, G. H. 1996, p.49). But the major definition of biodiversity is: the variety of life in all its manifestations (Lecture notes). This modern definition can sound like the variety of life on earth, variety of species, and the communities in which they occur. The major elements of diversity are: genetic, taxonomic, and ecological. The first one is Genetic (populations, individuals) – individuals of the same species. It means genetic variations between individuals in a single population and between populations of the same species. Genetic differences are the raw material of evolution. The second element of diversity is Taxonomic (Kingdoms, Phyla, Genera, Species - richness) – variety of species in a particular region. Taxonomic diversity assumes relationship of species with each other. Taxonomic diversity is very important in counting species. Species can be determined by taxonomic diversity. And the last one is Ecological (biomes, landscapes, ecosystems) – number of species and their relative abundance (Lecture notes), (www.countrycideinfo.com). In addition, level of diversity means species richness and as I said relative abundance. Species diversity is very important because every species plays a different role in the ecosystem. However, new variety of animals, plants, even other microorganisms or population decline, can be very influential on the balance of the ecosystem of other species. I also want to define in few sentences what an ecosystem is because it’s a part of biodiversity, different level of this variety. Ecosystem – is a system that includes all biotic factors like minerals, plants, animals, and they a re functioning like a unit. So members benefit from each other (www.learnthat.com). In this planet it is very difficult to measure the exact number of species, biologists think that there are from 10 million to 100 million species in the world, but scientists are trying to identify a number of species and their extinction. On the other hand no matter how we think, our lives depend on biodiversity but we usually do not appreciate that. As I said in the introduction that humans depend on other species for some important things like wood, medicines, food etc. These days plants/animals have properties that are discovered to provide medicines. In addition there is a big benefit for the world; all diversity provides ecological services like climate regulation, providing oxygen in the atmosphere for the people it helps to breathe (www.scienceclarified.com). We never think that biodiversity can be a change as well. So why does it change? It is happening with the climate change, natural disasters and environmental sustainability. Biodiversity change over time means that species and their compositions changes over time. In particular I can mention dinosaurs. Long time ago they were in our planet but now in these days they’ve gone into extinction. All these periodic changes can be called...


Bibliography: 2. Nagy, L., Grabherr, G., Thompson, D.B.A. (2003). Alpine Biodiversity in Europe.
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4. Seitz, J. L. (1995). Global Issues An Introduction. Chapter 5.
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