NUMBER OF MAYFLIES IN RIFFLES AND POOLS Essay Example | Topics and Well Written Essays - 1500 words

NUMBER OF MAYFLIES IN RIFFLES AND POOLS - Essay Example with high levels of dissolved oxygen while pools are relatively slow-flowing environments where the dissolved oxygen levels are not as high as in riffles. The nymphs prefer high dissolved oxygen level environments. For the purpose of this study it is necessary to introduce the mayflies (Ephemeroptera) because they are such a primitive order of insects that there is much that is unique about their morphology. This uniqueness has to be highlighted to enable better understanding of the experiments conducted to assist this study and the conclusions derived therefrom. Simply put mayflies belong to Class Insecta Order Ephemeroptera. They belong to the infraclass paleoptera and have primitive wings that cannot be folded over their backs. Fossil records reveal that they may have evolved during the carboniferous period 280-360 mya and their evolutionary history is closely associated with development of wings in Class Insecta as a whole. Modern day mayflies number about 4000 species distributed among 20 families and most are associated with running water (Brooks, Steve, A Natural History of Dragonflies, Mayflies and Stoneflies). Order Ephemeroptera is well-distributed across the globe except for the two polar regions – the Arctic and the Antarctic – and oceanic islands though it is well-represented in New Zealand (Order Ephemeroptera, â€Å"Soil & Water Conservation Society of Metro Halifax† Website, 2004). The name of the order Ephemeroptera is essentially derived from the fact that adult phase mayflies survive for a very ephemeral period of 2 hr to 3 days. They are unique insects in that they have two adult phases both of which are winged and ephemeral to the tune of 1-2 hr to maximum 14 days. At adult stages the insects do not feed and expend all their time on mating. The nymphs are ubiquitous and are usually found in shallow streams and littoral areas of lakes. Nevertheless, many species are restricted to specific substrata of macrophytes, sediments of waveswept

This document needs reivison Essay Example | Topics and Well Written Essays - 500 words

This document needs reivison - Essay Example Most specifically, the report had serious grammatical and mechanical errors and lacked coherence as well as flow of ideas. As such, the report was vague and difficult to read and understand. Most assuredly, I have recently stated my dissatisfaction and warned you against presenting such wanting reports but you have not demonstrated any attempt towards addressing these concerns. Although I appreciate your continued positive input and creativity to the firm, I feel that your poorly written report is demeaning the image and reputation of our esteemed firm. It should be clear that future reports should strictly follow the established writing standards and the report guidelines set out by the firm. Any employee who needs assistance in adhering to the writing guidelines defined by the firm should seek relevant help from the management or attend various in house workshops held in our firm. Indeed, professionals in the corporate scene provide significant information to employees attending the monthly in house workshops. Moreover, I am always available to offer any assistance geared towards your success and that of the company. Nevertheless, you should beware that this is your last warning and failure to adhere to the writing guidelines defined by the firm will lead to serious consequences that may include suspension. The company would highly regret such consequences and hence I advise you to consider my concerns in a positive and serious way. I am sure you will address yourself to these concerns and maintain a good working relationship with your colleagues and the firm at large. I encourage you to remain focused and work towards achieving the company’s goals. Indeed, if you have any questions or suggestions on these expectations, please feel free to contact me at the most convenient time. I am always pleased to address the expectations of the firm with you and I hope my concerns will help you to maximize your potential in this