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<br />Arizona Game and Fish Department <br />NGTR 125: Kanab Ambersnail Report <br /> <br />April 1998 <br />PaRe 8 <br /> <br /> <br />10 MILES <br /> <br />~ <br />N <br /> <br />GRAND CANYON NATIONAL PARK <br /> <br />13 <br /> <br />1 vAllBn PAJADmll <br />2 'KIlYHIllB SI'IllN\T <br />] SADDLB CANYON <br />. ROARDlO IIPIlINGll <br />> I.OWJm.lUBIlONPAIU <br />6 8ANTA~SPlUNO <br />7 IlIUPPIHG SPIllNG <br /> <br />I 1liUNDIlIlllP\llNG <br />9 tlPI'IlRDBIlR CIlIlIlK SPlUNO <br />10 I.OWJm. DIlIIR CIlIlIlK SI'RINO <br />11 SIlOWIIIlBAnISPlUNO <br />12147.IWIIJUllUIBEP <br />1311lAVIlIl.11NIlPAIU <br />" BIUDGIl CANYON CIlIlIlK <br /> <br />ig. I. Locations of Vueys Paradiac 8Dd potential eotaIJlisbnx:nt sites for Kmab ambennai.l in Grand Canyon, Arizona. <br />ites I -12 arc no National Pm: Service land; sites 13 8Dd 14 arc an HPalapai tribal1and. These sites an: rated as <br />, or More Desinble 8lIlllDg AGFD Habitat Suitability Categories. Less suitable sites an: not shown. <br /> <br />DISCUSSION <br /> <br />MONITORING <br />Recovezy of VP habitat following the March 1996 experimental flood has been slow. Low zone <br />habitat was impacted by high, steady flows in 1997 combined with a series of flash floods from <br />the Paria River. However, bootstrapped estimates of tile KAS population indicate a return to 1995 <br />levels of abundance, even with the reduced habitat. <br /> <br />More trematode-infested KASs were observed in 1997 when compared to 1996. The <br />pIatyhelminthine parasite, Leucochloridium, selects succineid snails as intermediate hosts and <br />passerine birds as definitive hosts (Baer 1971). The effects of this parasite on KAS population <br />dynamics is still unknown. Direct mortality of !CAS due to parasites have not been observed at <br />VP, although numerous live snails with missing eye stalks-presumably from ejected sporocysts- <br />have been observed (Stevens et ai. 1997b). Indirect mortality resulting from avian predation of <br />