Keystone predators increase the intensity of competition prey on species at random always prey on the poorest competitors prevent competitive exclusion by preying on competitors are observed only in rocky intertidal zones
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Keystone predators
- increase the intensity of competition
- prey on species at random
- always prey on the poorest competitors
- prevent competitive exclusion by preying on competitors
- are observed only in rocky intertidal zones
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- Which species is the stronger competitor for space in the intertidal zone? O Chthamalus BalanusWhen one species is better at obtaining and holding space than another, it is competitively dominant. Based on the diagram which non-mobile (sessile) species is the dominant competitor in the intertidal? Which is second? Rank the six non-mobile species from (1) most to (6) least competitively dominant. Below are the competitive arrows from the slides (recall that sessile consumers are superior competitors over the algal species). gooseneck barnacle mussel acorn barnacle coral weed black pine Primary Producers nori seaweed 1= strongest competitor and 6= weakest competitor common coral weed [ Choose ] nori seaweed [ Choose ] black pine algae [ Choose ] mussels [ Choose ] acorn barnacles [ Choose ] gooseneck barnacles [ Choose ] > > > >Are higher macroinvertebrate indicators of less or more stream health? Do different invertebrate species have different tolerances to pollutants, thus can be used as an indicator of stream health? does Aquatic vegetation has a greater influence on zooplankton or benthic macroinvertebraes
- Conservation status of specieschanges often as new threatsarise and current threatssubside. Fish and marine lifeare often threatened by humanactivities such as overfi shing,pollution of ocean and freshwater habitats, and climatechanges. When it comes tomaking choices about whatseafood to purchase andconsume, what resources areavailable to consumers to knowthat fi sh they are buying is notvulnerable or endangered?At which trophic level would you expect to find the highest concentration of a biomagnifying toxin? O primary producer herbivore mesopredator top carnivore primary consumerK P Parchment Exchange - Leader i edgenuity.com/player/ - SC5181 A 7 1 X Unmark this question + 7 8 What would happen to the ecosystem services provided by a coral reef if it were to sustain permanent damage? O The water that would otherwise filter through the coral polyps would become more dense with plankton. O There would be higher concentration of water pollution that could harm other organisms. O Timber production in surrounding land areas would decrease due to the lack of nutrients in the soil. O Humans would have more reason to visit the area in their boats. O 10 M O DELL ✓ Save and Exit 10 Next G<☆ English Sign out Kinley Heath Submit O A Oct 27 10:17 A
- Which factor sets the upper limit of Chthamalus' realized range in the intertidal zone? O Ability to withstand dessication O Interspecific competition Predation1. Examine the food webs for Lake Victoria, East Africa (fig 31.2 a,b) before and after the introduction of the Nile perch (Leveque 1995). Calculate the mean food chain length, percent of trophic groups at various levels, and connectance for each food web. Oreochromis Insectivorous Fish Chironomids Chaoborous Man Piscivorous Fish Zooplanktivorous Haplochromines Rastrineobola Zooplankton Detritus/Phytoplankton Lake Victoria in the 1970s Detritivorous Phytoplanktivorous Haplochromines Figure 31.2. (a) Food web structure of Lake Victoria before introduction of the Nile Perch. [continued on next page) Molluscivorous Fish MolluscsThe overexploitation of cod in the North Atlantic releases crab and shrimp from predation pressure and results in a boom in the number of crab and shrimp. The increased number of crab and shrimp cause a decline in zooplankton abundance, which subsequently causes an increase in phytoplankton abundance. This change in the food web is an example of which of these? top-down control bottom-up control O behavioral cascade O trophic ricochet O donor-control
- Study these two figures? Which graph represents Semibalanus? (d) When competition is asymmetric and niches do not overlap completely, weaker competitors use nonoverlapping resources. Chthamalus in Species 1 (strong competitor) (weak competitor) upper intertidal zone Species 2 fig 53.5 Fundamental Mean tide level niche Realized Semibalanus in lower intertidal zone niche O Pon Beran Cuminga Ar erve Niche (range of resources used) Copyright e 2008 Pearson Benjamin Cumnings. Alrights reserved. A. purple graph (left) B. green graph (right) A. purple graph (left) B. green graph (right) Number of individuals using resourceWhat is accurate about the nature of competition between species? Choose All That Apply O it takes energy away from other functions of the organisms involved Otraits that reduce competition are generally selected for it is less intense the more the niches overlap overtime it could potentially result in resource partitioning5. Use Models Choose one of the food chains shown within the food web in Figure 4-3. Write a paragraph describing the feeding relationships among the organisms in the food chain. Hint: Use the terms producers, consumers, and decomposers in your description. NOTEBOOK