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Wetland Ecosystem Conservation: A Review

October 28th, 2009 Admin

1. Introduction

A system is a group of parts that interact through one or more processes (Odum 1983). The term ecosystem was introduced and defined by Tansley (1935), who as “a fundamental organizational unit of the natural world that includes both organisms and their spatial environment.” Ecosystems have since been defined in various ways, and at different spatial and temporal scales (Golley 1993; O’Neill et al. 1986; Evans 1956). Some ecologists define ecosystems on the basis of biotic organisms, populations, or communities. For example, Hutchinson (1978) considered the ecosystem to be the environmental context in which population or community dynamics occur. Others define ecosystems in terms of their abiotic characteristics and processes (Rowe and Barnes 1994). For example, Lindeman (1942) defined ecosystems as “…the system composed of physical, chemical, and biological processes active within a space/time unit.” (more…)

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Biological pest control – Introduction

October 27th, 2009 Admin

Biological control of pests in agriculture is a method of controlling pests (including insects, mites, weeds and plant diseases) that relies on predation, parasitism, herbivory, or other  natural mechanisms. It can be an important component of integrated pest management (IPM) programs.

Biological Control is defined as the reduction of pest populations by  natural  enemies and typically involves an active human role.  Natural  enemies of insect pests, also known as  biological control agents, include predators, parasitoids, and pathogens.  Biological control agents of plant diseases are most often referred to as antagonists. (more…)

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Secure Your Business with IntegraScan Background Check Criminal Records

October 2nd, 2009 Admin

Do you currently possess a position as HRD manager? If you say so, surely there are lots of responsibilities laid in your shoulder in everyday, including in making the decision whether or not a person is qualified enough to join your business. For other of your best determination in making the decision, there is nowadays Integrascan.com, a site that providing background check service, in which it will allow you to know more about the person you are dealing with and give your best decision according to the result. You don’t want to have your office filled with persons that been jailed or using fake identities, right?

It might a little crossing the line to take a peek on other people’s background information, but for some good reasons, it is really recommended for some departments or offices to know their employee’s criminal records, since that it can also be used as the base determination in placing those people in correct job positions. For the service, all you have to do is just to enter the site, and get subscribed for your convenient feeling as you are likely to do some background check actions anytime you want. In this site you may also try their service for free, though of course the result is designed to be really limited. (more…)

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