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Free research papers and essays on topics related to: species diversity

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  • Dinosaurs Extinction - 1,537 words
    Dinosaurs Extinction The first question that must be posed when trying to crack the mystery of the mass extinction is to ask, throughout history were there any other occurences of this magnitude? The answer is a resounding yes. Altogether over time there has been about eight mass extinctions to large land dwelling vertebrates. The most recent was about ten thousand years ago, killing most of the giant mammals like mammoths, mastodons, super-large camels, saber-toothed tigers, and others (Bakker 428). The second question, is whether or not these mass extinctions follow a pattern? Once again the answer is yes. Every time a mass extinction occurs on the land ecosystem, the oceanic system is hur ...
    Related: dinosaurs, extinction, mass extinction, volcanic eruptions, new zealand
  • Effects Of Genetic Engineering On Agriculture - 1,696 words
    Effects Of Genetic Engineering On Agriculture The Effects of Genetic Engineering on Agriculture Agribiotechnology is the study of making altered agricultural products. Agribusiness is trying to alter the genes of already existing products to try to enhance the biocompetitiveness and adaptability of crops by enhancing plant resistance to drought, salinity, disease, pests and herbicides. They are going to try to enhance their growth, productivity, nutrient value, and chemical composition. The old way of doing this was through selective breeding, special fertilizer, and hormones. This seems now somewhat outdated with todays technology. Genetic engineering comes with many downfalls. Increased pr ...
    Related: agriculture, department of agriculture, engineering, genetic, genetic code, genetic engineering, genetic research
  • Freshwater Regions - 1,507 words
    Freshwater Regions Freshwater is defined as having a low salt concentrationusually less than 1%. Plants and animals in freshwater regions are adjusted to the low salt content and would not be able to survive in areas of high salt concentration (i.e, ocean). There are different types of freshwater regions: ponds and lakes, streams and rivers, and wetlands. The following sections describe the characteristics of these three freshwater zones. Ponds and Lakes These regions range in size from just a few square meters to thousands of square kilometers. Scattered throughout the earth, several are remnants from the Pleistocene glaciation. Many ponds are seasonal, lasting just a couple of months (such ...
    Related: freshwater, plant species, barrier reef, sea anemones, crucial
  • Introduction - 1,045 words
    ... nvertebrates. Bacteria, a form of microorganism is found throughout the ocean and make up much of the dissolved matter in the waters. They also help decompose the dead bodies of larger organisms. It obtains food and oxygen by means of chemosynthesis; a process in which the organism creates food using chemical nutrients as the energy source instead of sunlight. The bacteria live in cooperation with animals unique to this region, providing them with important nutrients. Animals without backbones are called invertebrates. Lobsters and clams are probably the most numerous and diverse group. Invertebrates in the ocean range from jellyfish to worms and crabs. Vertebrates are animals with backb ...
    Related: digestive system, pet food, decision making, aquatic, harmful
  • Threats To Our Ocean Fisheries - 611 words
    Threats To Our Ocean Fisheries Threats to Our Ocean Fisheries Most people are familiar with the problems of the blue whale, efforts to save endangered sea turtles, and the many tragic tales of dolphins dying in tuna nets. Many people do not realize the extreme danger that tuna and many other fish face. There is an alarming decline in fish populations, and this poses a dangerous threat to life in the ocean. If fish decline, so does the sea, into and unstable environment. Conservation measures, and public support for them are badly needed. For decades man has taken fish out of the sea, seeming to believe that there is an endless supply, and that this supply cannot be destroyed. We take these f ...
    Related: fisheries, ocean, environmental problem, food chain, vacuum
  • Tropical Rainforests Of The World - 2,795 words
    ... racterized as a nest parasite because it because it replaces the eggs of another species with eggs of their own , allowing the other species to incubate and raise their young. Their increased numbers have had negative effects on the reproductive successfulness of many forest-dwelling birds. In addition to titling the ecosystem balance in favor of species which are highly adaptable, the loss of habitat associated with habitat fragmentation may simply cause the other, less adaptable species rates to decline. A man named James Saunders documents one remarkable example of how changing large expansive areas of the birds of the wheatbelt of western Australlia as a result of fragmentation. He s ...
    Related: third world, tropical, tropical rainforest, world bank, government officials
  • Zonation On A Rocky Shore - 2,272 words
    ... a problem. The turbidity or cloudiness of seawater (due to plankton, sewage and other detritus) can affect the intensity of light reaching submerged seaweeds. Another factor is the seepage of freshwater onto the shore. Many seaweeds cannot tolerate salinity changes, so other species that can tolerate such changes will inhabit these areas. The biotic factors that affect the rocky shore tend to affect the lower limits at which a species may live. The biotic factors that affect the distribution of organisms on the rocky shore are: Food supply: All organisms need food to survive and so can only flourish in areas in which they can find food. Many species that are found on the seashore left t ...
    Related: rocky, shore, food supply, factors affecting, significance
  • Zonation On Rocky Shore - 2,235 words
    Zonation On Rocky Shore The seashore is a habitat that contains a wide range of microhabitats and ecological niches for different creatures. This is mainly due to the effects of the tides, that rise and fall twice each day. Tides are the vertical movement of water in a periodical oscillation of the sea, due to the gravitational pull of the sun and moon. The tides are on a semi-diurnal cycle, so there are two high tides and two low tides each day. Due to the orbit of the moon, the tides also have a monthly cycle. This creates neap (very low) and spring (very high) tides. The seashore can be divided into several zones, which are illustrated on the diagram below: Key: EHWS = Extreme High Water ...
    Related: rocky, shore, adult life, sea anemones, environmental
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