130 lines
4.4 KiB
Plaintext
130 lines
4.4 KiB
Plaintext
~ Gluing over eanals, rulugcs, nr buxlding rall
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aalurnns lnsulaled lnrnl me null. and enlder walers, as
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heal reluges Yovculd»luldu nsll (fig-In n.17l,
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. I’mvidmg heal reluges as cinhrmvered plpea,
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snaded eanals, ur Ranks 015 rn or so deep .n sha|klw
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ponds
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Adapled Ideal llsll generally need llllle assrsranee (o
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survive. hm seleered sloels or male llfll ean requne
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wings lar a weelr or rnnre nl sane-rue wealller, wnere
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na local heal sourees are laund, pund waler pumped
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um a dark 1001, rocks, or rcmflu areas vcw elllclenlly
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ealraels salarneal ar elose [0 move Efllnnlzy seenansol
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blmmfll mad can lse used .n llns way, orean have pxpfi
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laurred under llleln ar l-s ern depll. as lllennnl
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uphuning sysrenrs lor pond healing in mnler
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Glasshouses lo nald srnall ponds, eolnpasl heal.
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edlleemls and Hough reneelars are all srralegles ln
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nlalnraln lleal for lngller pnaduellan Gains ln ylelds al
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Iron 2 lo 5 lrnles are ealnnlon where ponds are
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regulared w uplrnuae (coding aeuvny and (pod growl»,
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Hauling devlees ean ralse waler levels a-c Dr m
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lglaasnausesl, and inhough llus dnem‘l snund
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specurulax, ll ean ealend lne gnawing penodaol Ash by
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30-40% (New suenlnl, In June, 1977) Callaerors, pt
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eaurse, depend on ms area 0! :0“an relallve |c me
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pond Hear purnps lrurn eanals can dellver hut m
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ponds ln llle same Wzy, snarlenlng nlalurauan “mm or
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nsl. arplanls luabmfl 0119(th lllaldlenal, apen pand
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areas Passive eulleelar syslenls are rdeal, and elleap ln
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run by a syslern nl lllerrneslpllnn and “(m-whim
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van/es ll heal saurws are plared belnw lne pond in be
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hukd. as m Fig“: ull
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SALINI‘I‘I
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Fnsh waler conlarns \ery llllle sall cdaslal Iagnons
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usually ronraln 7—4 rim per thousand lppll, lew lroes
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ean breed above llns eonaenlralrun, Seven ppr rs llle
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late upper hmi| Iur llulnan eansurnpllon, arackisll
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waler ls dereelably sally ar \I— z w, and nysrers my
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ue laund lruln llns ennrenlralian an. Tllese are llle
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sallnnles nl eslnanes and bntklsh walers M about 27
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ppr many shellfish and rnanne organisms are lnund,
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and me sea llsell ls ar 33—15 ppl
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In am: 0! hlgh evaporahon and Mlnded llde llnw,
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hyyzrsalme mndnions ean develop, Mnnne organism:
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aeldnrn spawn ibuvc dun ppl, and llfiih and nabs da
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ueeur (MN, n :5 allen as line—vex pupulanoni, mirage
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groups, ar glgannt Ianns Many desen ornanlsnls and
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sarna dcsen llsh ean Iwe lam ppl sall,
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Fish dune-l. live all "mi! llnes ln lnsnwaler Indy dn
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well above 3 ppl A small many lrsl. and sun
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lrnwever, mlgnu lresll lo sall and lvlee ver, ,same
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spawnln; ln rrners llranll, some m lne sea leelsl
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seeanse ol lnelr wrde nngu nl mkmnm, llrese gmups
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are :allpd (my/m e Many nlullu, anlrnnnrds, and
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some oysmu and slunnp ean be lepl .n [wall (a sallne
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walers Sallwaler Ilsll rarely lnlerale salmltv below 23
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Pvt
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changes ln salrnny may klll pund lisrl not adapled In
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esnlanes, sall nr lresnwaler ls alsu used lo lnll eelernal
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parasrles and dlsease ln llsll asluanes and uraelelsll
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walers genually eanlaln nlnre llsn species llrnn llle
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fiver luell, or the sea nllslnare, alrlunaglr me aea ls lar
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neller .n rnolluaes and elusueuns
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ln esluarles and lagoons, a halucline {sillrlmsh
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surlacel ear. dnclup. wlth lhe denser sall walee al
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depth, or puahms up under me surlaee nl an esluiry as
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a lldal wedge bell». llle lresn Wale! Haleellnes are
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common ln deep lagmms llr rlvers with barwiys.
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Manne lurens llve al drpm. and hrshwalel' nsll al me
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§u1f3<:,50me|lm?s lnr many rnrles .nland As lldes
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pusl. lnlnand leeede [mm large nvu esnranas, exhrm:
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chulgns .n lernperalurl- lespeerally ln wrnrerl and
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sallnlry can ell-cur, \o lnal al klw lrde a mndrllvmg
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snellnsll an be m leesll waler a. l-c, and ar lnplr nde .n
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aeawaler ar 204C Manv speeres ln ms rnne burrow,
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lingual! wllh me llde, pr relurn la llre raver al hxgh ude
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Thus, sal. \y ls a specllsvspwallc laerar ralner like
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lelnperalnee, and salrnny regulaumn lual as much a
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maller ul eaneern as lernperalues- regularlan, We
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aeldnrn gel sudden rnereases .n salls ln ponds, bnl a
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hand 0! Mann pond ulllure a! me lnslane hoplzs ls
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umenaal raln. Even wllh flood dlvrrsmn dralns, m» sea
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naell may mm: m dllule as la klll lobsms, prawns,
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mmflkhsh ln rnanne lnlpaundrnenls
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Verv nen brarklshswaler pnlyeullures nlalau, crabs.
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rnuller, sea bass, nnlldrsn, eels, and “‘01.“ m posslble ln
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e .7‘ e
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mun: 1:."
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saw POND muw HSN Pawn
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Ally we 0! whicallzclm Below pond level will mlmmsmhan
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heal m m wnfl ilslfl m winlll
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469
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