45. Siluriformes Zoogeography of Marine Fishes 46. Antitropical (or bipolar) pat

Question

45. Siluriformes Zoogeography of Marine Fishes 46. Antitropical (or bipolar) patterms have been noted for entire fish families (e.g, hagfishes, eelpouts, snailfishes, cods), genera within families (e.g., rockfishes, herrings, anchovies, hakes, skates, dogfish sharks), and species within families (e.g., flying fishes, basking shark, saury). A theory advanced to explain this distribution pattern is: In the past, lower ocean temperatures in the tropics may have permitted more continuous distributions of cool-water fishes. a. b. Cool-water fishes may have moved through deep water of suitable temperatures, thus avoiding warm surface waters. c. The antitropical distribution patterm may be the result of the movement of continental plates. d. Fishes w/ antitropical distributions may once have been present in the tropics but they were displaced through competition w/ more derived groups. e. All of the above 47. fishes comprise about 45% of the world's fish species. a. Neritic b. Epipelagic c. Mesopelagic d. Deep-pelagic eDeep-benthic Regarding marine fish diversity, regions, and habitats, a. number of species generally decreases as latitude increases (less diversity at higher latitudes) b. number of species generally decreases as depth increases (less diversity in deeper water) c. deep-water fishes generally occupy broader depth ranges than shallow-water fishes d. a and b e. a, b and c 48. fishes live beyond the edges of the continental shelves from the surface waters to depths of -200 m. Although the morphology of these fishes varies among taxa, in general these fishes possess streamlined shapes, strong skeletons and muscles, large eyes, and counter-shading. a. Epipelagic b. Mesopelagic (vertical migrators) d. Deep-pelagic e. Deep-benthic c. Mesopelagic (non-migrators) Nearly 40% ofall known fishes occur in shallow waters ofthe tropics most associated with coral reefs. The most diverse region is the a. Eastern Atlantic Region c. Eastern Pacific Region b. Western Atlantic Region d. Indo-Pacific Region 50

Explanation / Answer

46.All the above

47.Neretic fishes consists of world's 45% of total population.

48.a,b,c

49.Epipelagic fishes

50.Easten Atlantic region

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