The brittle star‚ or the scientific class name‚ Ophiuroidea‚ is a close relative to what most people know as the common sea star‚ which are both in the echinoderm family. Today‚ there are over 2‚000 diverse species of brittle stars that exist. While the brittle star may resemble a sea star at first glance‚ the brittle star has many distinctive characteristics‚ such as its physical appearance‚ habitat‚ role in the ecosystem‚ reproduction and movement. The brittle star is typically mixed up with sea
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larvae: lecithotrophic larvae 3. In general‚ time in spent in plankton decreases as egg size increases Pros and cons of different larval dispersal strategies; why all of them persist over time * Planktotrophs: Advantages: 1. Can produce more offspring with less parental investment (yolk) 2. Greater dispersal (longer time in water column) Disadvantage: 1. Larvae might not find enough food in plankton 2. Long time in water column
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NOTES AND COMMENT 343 DETERMINATION OF CHLOROPHYLL AND PHEO-PIGMENTS : SPECTROPHOTOMETRIC EQUATIONS~ It has been shown that chlorophyll degradation products may at times constitute a significant fraction of the total green pigments present in seawater (Yentsch and Menzel 1963; Lorenzen 1965; Yentsch 1965). These degraded forms‚ or inactive chlorophyll‚ absorb light in the red part of the spectrum; if they are present in concentrations significant relative to chlorophyll a‚ a serious error
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Lab 4 Worksheet: Model Ecosystems Student instructions: Follow the step-by-step instructions for this exercise found on the virtual lab and the instructions below and record your answers in the spaces below. Submit this completed document by the assignment due date found in the Syllabus. Please make sure that your answers are typed in RED. : 1. Please make sure you have read through all of the information in the “Question” and “Field Guide” areas. If you come upon terms that are
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Ibuprofen Abstract The project that I chose to research was the effect of Ibuprofen on the heart rate of the daphnia. The reason that I chose to do this was because many people in society use over the counter pain killers without really understanding any of the long term effects of this medicine other than clearing their aches pains‚ and swelling. One of the leading drugs on the market today is Ibuprofen which you may know as Motrin or Advil. Both drugs are identical except for quantity and
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The Andromeda galaxy‚ 2.5 million light years away. It’s racing through space‚ everything blown apart‚ like shrapnel in an explosion because our universe is expanding with an ever accelerating pace; hence every element of it is going away from its neighbors. We are seeing this galaxy as it was when our ape like ancestors first walked on the African plains. Further through space and further back in time. There is order in this chaos‚ a perfect pattern formation behind the infinite variety‚ an endless
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Oil Spills Pollution in the ocean is a major problem that is affecting the ocean and the rest of the Earth. Pollution is the ocean directly affects ocean organisms and indirectly affects human heath and resources. Oil spills is one of the harmful materials that are a major source of pollution in the ocean. “Oil spills stem from accidents involving tankers‚ barges‚ pipelines‚ refineries‚ and storage facilities‚ often while the oil is being transported to its users.” (NOAA 2012) Based on information
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A Survey of Eukaryotic Cells and Microorganisms HISTORY OF EUKARYOTES: 1. Evidence indicates that the first Eukaryotic cells first appeared on the earth approximately 2 billion years ago. Fossilized cells appear in shale sediments from China‚ Russia and Australia the date from 850-950 million years ago. 2. Biologists have discovered evidence to suggest that the eukaryotic cell evolved from prokaryotic organisms by a process of intracellular symbiosis. 3. Some of the organelles that
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Fish have been a protein source throughout history. Early fishing primarily involved individuals capturing fish near their communities for consumption or trade. Ships gave fishers access to ocean-based fisheries. Commercial fishing became industrialized by the late nineteenth century‚ as technological innovations helped locate‚ catch‚ and process fish. In addition to fish living in natural freshwater or saltwater fisheries‚ fish cultivated in fish farms ’ ponds or tanks represented approximately
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well as blowing water at them to keep a steady supply of oxygen. After the eggs hatch‚ the mother clears an opening in the den for her young to swim up to the surface of the ocean. Life Span After hatching the octopus larva become much like plankton‚ drifting along the surface of the ocean feeding on particles of dead food from other larger animals. This stage lasts 30-90 days at which point the octopus descends to the bottom of the ocean where it will spend the rest of its life. The Pacific
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