The Undersea Predators 2024 pdf epub mobi 电子书


The Undersea Predators

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发表于2024-12-25

The Undersea Predators 2024 pdf epub mobi 电子书

The Undersea Predators 2024 pdf epub mobi 电子书

The Undersea Predators 2024 pdf epub mobi 电子书



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出版者:
作者:Carl Roessler
出品人:
页数:0
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出版时间:1984-11
价格:105.00
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isbn号码:9780871968937
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The Undersea Predators 2024 pdf epub mobi 电子书 图书描述

The first family of predators we shall<br >i consider are those which most ob~en,ers are armed with chemically activated, springloaded<br > never suspect of predation, stinging cells, called cnidocytes, which are tipped with structure ~mallcr th m ,..,, ,<br > Nowba~k,qf ~ ,~r I ,,: ,<br >:he sunlit shallows of the tropical world are neurotoxins. While the poison darts, called then hundred~ .m,i th.,u,~,~ ~ ,. ~,. .<br > nematocysts, in these stinging cells Usual v cannot<br >:m to us gardens of coral. As we look at these penetrate human skin ( f they do, the pain is you see.<br >our percepnon of their life is unavoidably<br >~ d by our experience on land~ To the mind of temporary), they are highly lethal to marine organisms Then lina,gine ~-tmtles, ,, ,r.xi h ,,,<br > the vast rock bulk beneath the rt r<br >tl man, a bed of corals has as its closest fishes. The tentacles capture food that is carried along would take the loquaciou, ,, ~-it~h, <,~,E,,, ,i<br > SUCh as zooplankton or, in the case of anemones, to The number of polvp~ > ,Inlt.h ~ <br >a flower garden~ Both are beautiful, both are in the current-drlven waters and pass the food to the<br >"ized by a profusion of color and form, both central mouth to be ingested by the coral.<br >ted" in the ground~ Naturally, then, a bed of<br > Asimov or a Carl Sagan t , v,,k~- d~:m l,. , -~<br > Many corals also have a complete back-ur) s "ste "<br >~ colored corals just beneath the surface of ~ smlply stand in awe.<br >~ evokes the flower-garden image, and many survive even a complete absence -g ; 5" m to Corals reproduce both s~xuaJlv an,/ *,c,q ~l],<br > . * current-tmrne<br > method performs a valuable, funcri~,.. A v,~,<br > food. Embedded in the tissue of coral polyps are reproduction (or budd.ngi occur~ whet, ~r, m,i~<br >u write about the sea s creatures further this microscopic algae cells called zooxanthellae. These tiny polyp develops a bud which gr-m, r3~ht ,.~~- ,,<br >.n by referring to these communities of coral " , "<br >gardens." plant cells gather sunlight and the coral s waste, and " "<br > This is invaluable to the dome .~r rcct-bu,/dm< ,<br >Ith about corals and other sessile (rooted) sea photosynthesize food and oxygen. Thus, the coral and If you were to draw on a b-,lloon a nun,b~,r ,t ,<br > zooxanthellae nourish each other even without other poiyps, then inflate the balloo~,, rot, mm~ed, ,t~l<br >is far more intricate and complex, food. It is, in fact, the zooxantheflae which Usually that the<br >in with, we must recall that the sea is like a give color to the coral; coral polyps themseh,es are role of budding is to fill in d~e ::at., ~, r<br > n at its clearest, seawater contains quantities colorless, dome grows larger, <br >,lankton and zooplankton~ Phytoplankton are Another profoundly important chemical activity of open water. The resulting pelagic lap,~,, crmbk, ,,<br > Sexual reproduction releases eggs md ,pctm J,<br >Iplex communities of single- and multi- the coral polyp is the secretion of limestone (calcium to colonize new regions far downstream, ,,r ro<br >e-floating creatures which collect sunlight<br >t their nourishment via photosynthesis, carbonate) in the form of a protective cup about its repopulate areas of natural destruction.<br >ttlike cells are a principal source of our body. When a coral is not extending its tentacles to<br > feed, its body is withdrawn into and protected by the Interestingly, in certain areas wt ere men h ~ ,<br >(ygen supply. Most zooplankton, on the stony cup. dynamited cora reefs for fis a or con,truer.on, ,,<br >I. are often troy creatures who ingest The cup each coral polyp secretes is extended by the in the moon-barren craters~" " ~ " "~<br >kton and other zooplankton for their food. polyp over the years. The cumulative lengthening of corals seem to have difficu tv estxbl s n ~ h~ rn-<br >~ for ~uch sessile creatures as corals, Tridacna<br >uges, and tunicates (sea squirtsl to have thousands of cups by succeeding generations of corals Among the 2,500 species of coral there .~ .m<br > astonishing variety of shapes, sizes, and cok~r~ m<br >his plankton soup as a reliable food supply, creates a coral head. The base of any stony-coral -<br > structures they form.<br > structure is composed of ancestral skeletons, with the There are vast castles of tan Montastrea ~avcr~:o.<br >rest be stirred. The motion of the earth<br > CUrrent generation of live polyps inhabiting their cups corals; tortured edifices of fire coral (milleporal;<br >tis activity through wind and water Currents on the surface of the structure~ When you think of the dainty pink or purple Acropo,u with their delicate<br > e the plankton in endless cycles about the masszve size of many Coral heads, you begin to antler-like branches; and the soaring stonehcnges<br >basins. Plankton and ocean currents are the appreciate both the numbers and the crucial building formed by huge beds of elkhorn coral.<br > ival for ~he stationary creatures of the coral role of corals on a reef~ Vast accumulations of coral Then there are the gorgonians. Those ~ hich h~e<br >~ft, radially symmetrical ey inder containing heads form the world s coral reefs. Whole tropical the shallows, where the wave-surge is their trequem<br > the basic body plan of a coral polyp. The islands are composed of immense coral reefs rudely companion, have a flexible skeleton of wiry gor~oni<br >tad digestive tissues, plus reproductive " thrust above the water s surface by the forces of plate which can withstand countless Wave-surg~:s without<br >p this cylinder is mounted a central mouth. .~,~ ~!:: teCtomcs or glaciation~ ~<br >mouth on the upper surface (or at least You Soon begin to appreciate the astronomical breaking. Other gorgonian corms are limited to rock<br >O.u_ter edge) of the cylinder is a ring of<br > 2.~,~ numbers of coral polyps nvolved in these dry canyons in vast reef structures, canyons through wh~<br > {" recitations of fact. Spend a montent on a snorkel or environment can produce fans of brilliant vdlow,<br >u~g tentacles. -~ ~?; -, tidal currents flow. In the South Pacific th s<br > scuba dive and try to count the coral polvos on a<br >y,h~ ~ght or a multiple of eight tentacles single coral head. There will be at least hundreds and current flow. A third type hidcs its brilliant reds, its<br > IrLsome corals these tentacles arc smooth , .<br >~! il~gs the ten tacles of rep tst held testg tion in a his to ry 150 feet.<br > fagt ones 7::, n thehu~~reds ~r Thoroyalty of ~rotbe<br > ~ a n!illion polyp the l~d,_ o,,,:c immense soft corals of<br >

The Undersea Predators 2024 pdf epub mobi 电子书

The Undersea Predators 2024 pdf epub mobi 电子书
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