. The Canadian field-naturalist. Natural history. 336 The Canadian Field-Naturalist Vol. 115 Petitcodiac Headpond Petitcodiac River. â¡ None â Rare Figure 6. Distribution and relative abundance of the Triangle Floater (Alasmidonta undulata) in the Petitcodiac River and tributaries upstream of the Petitcodiac cause- way. the headpond except those living in the sublittoral zone (S. Richardson, J. M. Hanson, and A. Locke, unpublished data). The ability to colonize these impoundments requires a highly mobile host fish for the glochidia. The known hosts for Eastern Floater include Threespine Stickl
. The Canadian field-naturalist. Natural history. 336 The Canadian Field-Naturalist Vol. 115 Petitcodiac Headpond Petitcodiac River. â¡ None â Rare Figure 6. Distribution and relative abundance of the Triangle Floater (Alasmidonta undulata) in the Petitcodiac River and tributaries upstream of the Petitcodiac cause- way. the headpond except those living in the sublittoral zone (S. Richardson, J. M. Hanson, and A. Locke, unpublished data). The ability to colonize these impoundments requires a highly mobile host fish for the glochidia. The known hosts for Eastern Floater include Threespine Stickleback {Gasterosteus aculea- tus), White Sucker {Catostomus commersoni), Pump- kinseed (Lepomis gibbosus), and Common Carp (Cyprinus carpio) (Wiles 1975; Clarke 1981; Threlfall 1986). Threespine Stickleback and White Sucker are recorded in the drainage but only White Sucker is abundant at all sites where Eastern Floater was col- lected. Indeed, White Sucker is common throughout all of the drainage but habitat requirements probably limit the distribution of the Eastern Floater, which was absent from moderate- to fast-running water and coarse substrate. The American Fisheries Society also considers the Eastern Elliptio to have stable conservation status in Canada and the USA (Williams et al. 1993). The pop- ulations of Eastern Elliptio in the Petitcodiac River system do not appear to be threatened. The only known glochidial hosts of the Eastern Elliptio are Yellow Perch (Perca flavescens) and Banded Killi- fish (Fundulus diaphanus) (Matteson 1948; Wiles 1975; Paterson 1985). Yellow Perch do not occur in the Petitcodiac system while Banded Killifish were observed at all sites where Eastern Elliptio was found. Banded Killifish were also observed at many sites where Eastern Elliptio was absent, especially in the main Petitcodiac Headpond. Similar to the East- ern Floater, the availability of suitable substrate appears to be limiting distribution of Eastern Elliptio rather than the
Size: 1739px × 1438px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
