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<br />Arizona Game and Fish Depanment <br />NGTR 125: Kanab Ambersnail Report <br /> <br />April 1998 <br />Page 8 <br /> <br /> <br />10 MILES <br /> <br />~ <br />N <br /> <br />GRAND CANYON NATIONAL PARK <br /> <br />1 VASEY3PAllADISE <br />2 'KE.'fHlXJ!SPIUNO'" <br />) SAI::lOUCAN'YON <br />. RO.WNG """"'" <br />S LOWER 1UBBON FAlLS <br />6 SANTA MAlUA 5PIUNO <br />7 DRlPP1No !PRINO <br /> <br />I "'""""" 3PRlNO <br />9 L!PPIiR DEER CREEK SPRJNO <br />10 LOWER DEER CRBEJ::!PRINO <br />11 SHOWl!RBA rn SPlUNO <br />12 !.(7'Mn.I!RR.SEBP <br />I) 'D.AVEllTlNRFAlLS <br />I" BRlDOB CANYON CREEK <br /> <br />ig. I. Locations of Vaseys Paradi~ and potential establishment sites for Kanab ambcrsnaiJ in Grand Canyon, Arizona. <br />ilcs ) -12 are on National Pa.rk Service land; sites ) 3 and ) 4 are OIl HuaJapai tribal land. These sites are rated as <br />timum or More Desirable among AGm Habitat Suitability Categories. Less suitable sites are not shown. <br /> <br />DISCUSSION <br /> <br />MONITORJNG <br />Recovery of VP habitat following the March 1996 experimental flood has been slow, Low wne <br />habitat was impacted by high, steady flows in 1997 combined with a series of flash floods from <br />the !'aria River, However, bootstrapped estimates of the 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 />platyhelminthine parasite, Leucochloridium, selects succineid snails as intennediate hosts and <br />passerine birds as definitive hosts (Bacr 1971), The effects of this parasite on KAS population <br />dynamics is still unknown, Direct mortality of KAS due to parasites have not been observed at <br />VP, although numerous live snails "ith missing eye stalks--presumably from ejected sporocysts-- <br />have been observed (Stevens el al, 1997b), Indirect mortality resulting from avian predation of <br />