88 lines
2.7 KiB
Plaintext
88 lines
2.7 KiB
Plaintext
Deplh and plans: ragelher serve as a 5:1 of breedlng
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reluges Ior lhe laud organisms a! n-nnwures and
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earnmlres As we wlll laler see, the conllguratinn ul
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levels al dlserenl depth may have a pmlound elreea an
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lhe lanal yield dravallalalllly nleueh laud organrarn.
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Thermodlnes may dtvdup above l5 m deplh, and
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are lilrly typhra) of lakes sub|x| lu sudden seamnnl
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thingzs In «her lemperarure Overturns m tempura»
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mm lypleally o<<ur in aulunrn and spvlns Whlle In
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summer he rurlaue walers rernarn mnslslemly wanner
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lhan mos: al deplh, m wrnler we ran ge1 surfim lee,
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llren wanner wuler al deplh, and finally lee again deep
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m 1h: lake, where very euld interns peel up and heeze
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sash rnay llve m a Sun a! lry sandwich, or mzked away
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hemed m a modes: have nr hullnw ln shallwerwaler
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rows IN smug AND FLOW
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Funds ean he bail: Isolamd hum. pnrnlkl wrxh, ln
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(omenmve sent: w. , uader sequenses wilh mhn
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ponds, uras any eennlnnahen ol lhese They can aka he
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annrdaled lnesledl one wlllnn earl. Milan and in lael
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have some lealuree whreh pennrl linear Hangman:
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uhe pond aseanal nrwmerway)
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lselaled Punch and ‘lsalalmn Fund: are limxlur m
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Evtry iqunnnm keeper New sleek, diseased stsxk, mal
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polymflums, and an rnauranee agalnsl general Ivss may
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dlelare a ael ol stlllrwuer Ponds in qrnre separale
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§Imahons (um shiving any flow 0! wa-erl. A sel ol
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fink: above grade, 07 snll»pands lllled one ar a urne
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can be elleenuely mlaled. Even ii erealed rhe Sum,
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lhey wrll s|ill manage |0 he dlllewnk, whuh IS one 0!
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lhe la ahuns ol aquaeulnare Waler syslms are me
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eenneered Wflhln rherneelves, and eunvey small
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drllerenees mm ripldly lhan land sysxems
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Ponds m parallel are perhaps lhe enrnrnon
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lrah—euhure syslern, and are analagmus m Ilnsahon
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hays an land In fllal lhey past-5‘ a head canal (inflw
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syslernl, an lndmdual flow»mx-mlgh, and a nil eanal
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ldrarnage system) whleh also wane lor surplus ware.
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ln rarna, They are ellem'vely lsahud unlrss a diseau,
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pollumfl, or qualllau-ve ehnnge mans m lhe cur-Ilium
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walee supply, when all may Iall logahrt, unleee (as ‘5
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alsu man-nan) flow regimes are suggend so that narne
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new, elhera a! shll.
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the pnrallel rerrea ls ideal lur valley [loot pends
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where water al head has been dwmcd ilung nanmar,
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lor alngle feeder plpes, and nar sarne nlrmw lldal
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benehes There are many xdvanuges, and same haale
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dreadvanlage; m um one eannar 'leed lhe elher- Thal
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ls, we ennnol rel up a ednlmlled nophic ladder in
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FlflfllE 1er
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couszmws SERIES IN OPEN owns
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A amneea fllllusa elannen ll .nlemls vwz malnana xml:
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Mum. and small nemanenl was ln unmm
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MWOUNED Win-—
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MD are
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mwe RIP-MP
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I Pol-fl Wm w- hs animal! as mu ‘4: mm are...“ "we! ul
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lampimmilsluuunm palm lsea lull
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476
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