Concept explainers
Just as the invasive Cauterpa seaweed often spreads uncontrollably when introduced to environments free of its normal predators and
Sometimes, a protist released into a new environment has a damaging impact not because it overwhelms an ecosystem but because it directly causes a disease. What are some examples of such an introduced disease among the alveolates?
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Biology: Life on Earth with Physiology (11th Edition)
- Dinoflagellates are unicellular, marine protists. Dinoflagellates are bioluminescent, but only at night. During the day, they carry out photosynthesis similar to other autotrophs. At night, however, they bioluminesce every time they are disturbed. They are often seen in the wakes of ships at night. While the reason for this bioluminescence is not fully understood, many scientists concur that it is a form of self-defense. If small fish begin to feed upon the protists, the protists will begin to bioluminesce. These flashes of light in the dark water can alert larger fish and draw them towards the small fish, upon which they prey. By making the small fish vulnerable, the dinoflagellates are able to protect themselves. Based on the information above, a researcher decides to design an experiment in which she is testing how long it takes for dinoflagellates to recover after different amounts of disturbance. She maintains 10 containers of dinoflagellates with similar temperature, salinity and…arrow_forwardHow are diatoms and dinoflagellates used in monitoring water quality? Cite two (2) examples. What are zooxanthellae? Describe their role in symbiotic relationships.arrow_forwardYou have discovered a new species aquatic protist that is a primary producer. It cannot swim on its own. It appears to be resistant to physical damage from wave action due to the presence of a glass-like wall. Which of the following organisms would this organism be most like? A) diatom B) dinoflagellate C) apicomplexan D) red algaarrow_forward
- A bloom of dinoflagellates is discovered in Tampa Bay. Sampling on Thursday morning indicates an initial population of 27524 cells/L. If the dinoflagellate has a growth constant of 0.67 d-1, how many cells will be present on Tuesday morning?arrow_forwardWhat is the most reasonable explanation of why algae are unlikely to cause human illness and disease? They are not typically motile. They obtain their nutrition from the environment. They are extremely susceptible to digestion by the normal human microbiota. Their cell wall is easily digested by humans.arrow_forwardGive three reasons why tilapia does not stay in the seaarrow_forward
- Why are Cryptosporidium parvum and cryptosporidium hominis associated with water-borne outbreaks of diseases?Why are water supplies infected in the first place ? thank you!arrow_forwardPlatyhelmenthes (flat worms) These creatures have unique regeneration properties. What does that mean? We looked at a few parasitic examples of this group. Be able to identify the life cycle of one or more of these individuals. What is a primary host? A secondary host? Distinguish between turbellaria, trematode and cestodaarrow_forwardYou’ve been noticing that a local pond has developed a green scum that is getting thicker and thicker. When you look into the water, you see fewer fish and other animals than you used to, and you see fewer birds around the pond. Based on what you learned in this chapter, what is this process called? What are two possible causes. Explain in 10 sentences or morearrow_forward
- Visit the ANEMONE page:http://www.aquariumofpacific.org/onlinelearningcenter/species/clown_anemonefish10. What type of symbiotic relationship do clownfish and anemones exhibit: mutualism, commensalism, or parasitism? Explain.11. How are clown fishes protected from the paralyzing sting of the anemones?arrow_forwardWater-related activities such as swimming underwater, diving. or other water sports can result in water going up the nose. Promitosis Amebae penetrate the nasal mucosa Trophozoite Flagellated form Amebae migrate to the brain via the olfactory nerves causing primary amebic meningoencephalitis (PAM) in healthy individuals Vector borne parasite Facultative parasite Obligate parasite Ectoparasite Trophozoites in CSF and brain tissue Flagellated forms occasionally in CSF Cyst A=Infective Stage Diagnostic Stage CDC SAFER-HEALTHIER PEOPLE" Observe this life cycle for Naegleria fowleri, an amoebic protozoan also called "the brain eating amoeba". N. fowleri usually completes its entire life cycle by eating bacteria (e.g., in pond water). What is an appropriate term for its relationship with humans?arrow_forwardName two groups of protists known to cause HABs in marine ecosystems. What hazards do HABs pose for other marine organisms and humans?arrow_forward
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