illnelrons on an elemenr, i| eoiiapses One eannol reasonably eapeel a eow lo give milk, raise a call, ioraee lo own iood, Plaugh, liaul waier, and lread a eorrr rnrii. Farmlg an elemeni io lunenen, lroweyer, is a very dilierenl pmposlhml irom pufiing ii in poaioon wliere rlr narrirai or everyday behaviours perrnii benerrrs lo ollier parisoi riresyrlern Film! eonmiy, a lree or rnicken experiultu no rouse riol rommen lo all erees and eiurkens aboul llieir daily lnisrness rurllrer, ii we piaee any oi llie ollier elemenis needed dose by, lire nee or eliieken lias less sooss ilian normal. I "it design approaen ind! llral permils eemponenrs lo provide many ilinrlions wilnorrl ierring runelrons illral are nor in any ease lnlierenii upon lliai elemenl The elusken may be buiy, bin nel overworked people, loo, like lo oe wirere rlierr very diiierenl and eompienwnlary orpalnirries are used railier llran being ioleod Io eillier a single llinelion like a M—a—ynr emekeri or a iypisr eonnned lo a mpflm operaiiion in an oiiirel, or so many iunenons ilral iiiey suiier depnyarron or overload iiiko olir eow rbovei smu we may be deilmd es minor pleeoniion oi naililrai iomlion, orol loloeo lunnloll Harmony my be oelim as me inlooroiion oi elioson and naiiilal liineiione. and we supply oi emrlnal needs. 2.11 DIVERSITY Div: ry rs lire number oi driierenl eornponenis or eonslrrrris in ine syslem. an emrmmrrnn oi eiemenis and 0! pans ll lias no reinliorrsnip lo eonneeoons be- rween eomponenis, and hide lo ilie irrnelron or me sell-meniaong eapaerry oi any real syslem iwiinrn llre boundanes oi loo iew or loo many eempononrsi. Thus diyersriy eliber oi eomponenis or lwemhlits does nol oi nseii gunranlee eiilier siabiilry or yield wnere we MIME"! surli dive-oily, as in our gardens, llien lliis may guaraniee yield, bill ii we leave our gardens. iney will ororpliiy, or simply be oblilerrred oy non-mainla ned and lrnrdy speoes adapieoi lo llial sire las rs eyldenl in any abandoned pardeni Thus, our own eiiorls are an mu‘ral parl oi mainiainine dryersi in a pennaeuinire syslern Few species gmwn by people peroisr beyond lire liieirme oi those species ii we leave llie slnlarion alone Auslnlia rs n eorrnrry wlrere iowns may arise and be abandoned lo serve a mining or porl operailon wnere (hese were burll in ioresied areas, uiey are oblihuakd by ioresi in 30—50 years, will perlirps a iew neer sueli as daies, mulberrres, and fig; persrsiing in sayannalr er isoialed dryiand ioealiorrs.1lrese ~ruryryor nees are lrnporlanl lo nole in planning longer—rerm sinbrlily lor llial Ieynn. Gun drverrlly may rreaie rliaos or eoniiislon, 32 wlreroar rnirinpie innelion irnner order and develops reroureer. lbeiieye lliar a nappy medium is io irrrirrde as muck dryerniy in a errinvaled eeosyslem as rl ean marnialn llseli, rnd lo lei i| simpiily or eomplieale iunlier ri rlial is lls nanire. Very dryerse rims, espeeraiiy siren alaslran sysienis as eornpeiine beiieis, are diliirull ro mako eornpaiible wilir any nanrrai sysiem, or knowledge, so lirai some roro oi dogmane dlvusuy are as lneompalrbie as a oliieken and a lor Although irrre Immpuibllily lluy be rare, one should lie prepared ior il io eaisl, and an “unveiling neilirai eomponeni ran be innodrreed,as rs lire case when gnawing lliose bad neighbours" apples and wainllis, WMIEI rs neeasaary lo mieryene leh a mulberry, wlilrli eelsaiong wlili lliern bollr. MW ii is nol me nonlbol oi divanse illinos in a design llioi loads m sunny. ii is Ihl numbll oi bonoiiolal connoaiens bolwoon iii-s. MWMMS. ii ioiiews inal addin in a ieelinoioey or living species ‘lusl to love ir \hm‘ loss no sense lo il Adding il in lo supply a need or eonsurne an ornerwise wasled mnmln do Something iisdul—malvks a ereal deal oi sense, alien, bnwever, we iaek iuneiionai iniorrnanon on componenlr and may lliereiore leave our leelmoingies or spears in dzsigns whkh would have been userui hid we known Thus, IMurma'linn is th- thical pololnial msoliroo. it becomes a nrsollroe only when unlined mo aided ripen in ilie real world, resonrres nre tangy slnrages, in llie absirael world, riseiui iniormaiion or irme. Wall-w. rn iris talegonri oi resourees. ineirldes lime and divers-ly Dryersiiy e/rlsei/rs now nol seen as a lesoirree. bill i dryersliy oi lenmrni lunrironri lumuniam’ renarniy is a reooureo Compieariy, in me si-nse oi some powerlrii rnlereonneelions beiween species, rs wlrai we are really mixing rn iood sysrems. Such mmpieriry lias iis own rules, and we are slowly evulving inose rules as reeemmendalions lor peiyrnilures ideaii wl|h elsewlirre in rlris book under llielr eiirnanr eliaracler- (skis), or as "guilds" ni pianis and animals lnal assrsi eaen oiuer reier Moon mew sieninl, 223 Feb ‘85) r lrales beiween nellness illie number oi sperles per unrl areal, drurrsny illie reialwe abilndanee oi speeresi, and mitts: inaw rpeeies eonrribllie io me biomass ioiaii lie noies llial rieliners mny derrease in planls as sysierns age, when sliade and rompeirlren reduce annuals or weaker speeies, bin lliar rlelrness mry liren rnrrease in animals such as deeompnsers, diie io rlre dzvelapmem oi a grearer range oi nielies and mierociimare imore animals live in migrated or unerri gnshnds, bill less pianl species suryieel Rirhness oi lroe species lras very reeenlly been ooneialed lo lire energy rise 01 ilial piani romrnunily, as measured by eyopolranspiralron were sereniisi, 22