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1、LANKESTERIANA7(1-2):334-341.2007.TROPHICRELATIONSHIPSINORCHIDMYCORRHIZA–DIVERSITYANDIMPLICATIONSFORCONSERVATION1,32HANNE.N.RASMUSSEN&FINNN.RASMUSSEN1Dept.ofForestry,UniversityofCopenhagen,HoersholmKongevej11,Hoersholm2970,Denmark2Dept.ofBiology,UniversityofCopenhagen,Gothersgade
2、140,Copenhagen1123,Denmark3Authorforcorrespondence:hnr@kvl.dkKEYWORDS:foodlimitation,heterotrophy,lifehistory,mycophagy,predator-prey,senilepopulationsIntroductionOrchidmycorrhizaisstillconsideredaunilateralrelationshipOrchidspeciesareperennial,andthoughdemo-graphicdatasuggestth
3、atthefamilyincludesr-aswellasK-strategists(Whigham&Willems2003),)'0.0224Tc0.1026Tw(mostspeciesarepotentiallylong-lived.Individual)'0.0115Tc0.1135Tw(plantsmaybekeptinlivingplantcollectionsorin)'0.0148Tc0.1102Tw(naturereservesforpracticallyunlimitedperiodsof)'0Tc0.0435Tw(time.Ther
4、eareseveralreportsonnaturalpopulations)'0.083Tw(suspectedoflittleornoseedlingrecruitment,“senile)'T*0.008Tc0.117Tw[(populations”(Tamm1991,Rasmussen1995),espe)1(-)]TJ0.0043Tc0.1207Tw(ciallyamongrareorchidsundercriticalsurveyance.)'0.0131Tc0.1119Tw(Suchpopulationsmayfunctionasasee
5、dsourceto)'T*0Tc0.055Tw[(neighbouringareasbutarelikelytoeventuallydisap)3(-)]TJ0Tw(pearfromthesite.)'0.9144-1.3548TD0.01Tc0.085Tw[(Sustainableconservationthusrequiresthepreser)2(-)]TJ-0.9144-1.3548TD0.0771Tw(vationofconditionsthatenablethespeciestocarryTransportofcarbohydratesfr
6、omfungitoseedlingsthroughitsentirelifecycle.Theconservationalcon-oforchidshasbeenamplydemonstrated,beginningwithSmith’sexperiments(1966,1967).Thereisno)'T*0Tc0.079Tw[(otherfeasibleexplanationforthelong-termdeficien)4(-)]TJ0.0216Tc0.1034Tw(cyinthephotoassimilatingapparatusknownfr
7、om)'T*0.03Tc0.095Tw[(orchidseedlingsgenerallyandadultstageswide)2(-)]TJ0.0465Tc0.0785Tw(spreadinthefamily(e.g,Girlanda)'ETBT/F21Tf9.3009.3403.7915362.0967Tm(etal.cernshouldalsoinvolvespeciesofotherorganismsthatareassociatedduringacriticallifestage,suchasapollinatorduringflowerin
8、g,orasymbioticfun-gusduringseedgermination(Zett
