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american samoa - University of Hawaii at Manoa Botany Department

american samoa - University of Hawaii at Manoa Botany Department

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More specific monitoring <strong>of</strong> stream fauna should be made immedi<strong>at</strong>ely upstream <strong>of</strong> the Fa<strong>at</strong>afeStream crossing <strong>of</strong> the shoreline vehicular trail to V<strong>at</strong>ia Village. Such monitoring shouldinclude the collection <strong>of</strong> driftnet samples <strong>of</strong> outgoing larvae, <strong>at</strong> least two times per month, for3-4 hour periods in the evening. The driftnets (150-200 ųm mesh) should be <strong>at</strong>tached to rebarpounded into the stream substr<strong>at</strong>a, or simply suspended from trees or bridges to th<strong>at</strong> the net is<strong>at</strong> the surface <strong>of</strong> the w<strong>at</strong>er. The samples would subsequently be preserved in ethanol. The typeand number <strong>of</strong> fish and crustaceans should be enumer<strong>at</strong>ed using a dissecting microscope. Use<strong>of</strong> a dissecting microscope will likely require a 2-3 day training class and the necessaryequipment.Molluscs should be monitored by mark-recapture methodology, or quadrant counts <strong>at</strong> nightsince most are primarily nocturnal. Some training in these techniques is recommended forselected field monitoring personnel.Site MaintenanceA one-time cleanup effort will represent an important first step toward long-term streamenhancement. However, the initial cleanup is <strong>of</strong> limited benefit if it is not associ<strong>at</strong>ed with theimplement<strong>at</strong>ion <strong>of</strong> a long-term maintenance str<strong>at</strong>egy.Periodic site maintenance should take place within the project area approxim<strong>at</strong>ely four timesper year. Household wastes along the lower reaches <strong>of</strong> Fa<strong>at</strong>afe Stream are expected torepresent the primary focus <strong>of</strong> long-term site maintenance. The periodic long-term maintenance<strong>of</strong> the Fa<strong>at</strong>afe Stream culvert underne<strong>at</strong>h the primary shoreline trail will be necessary to ensureadequ<strong>at</strong>e tidal exchange and the maintenance <strong>of</strong> brackish w<strong>at</strong>er quality.A crew <strong>of</strong> three to four persons will be necessary to periodically walk the 450-foot length <strong>of</strong>lower Fa<strong>at</strong>afe Stream, as well as rel<strong>at</strong>ed road culvert immedi<strong>at</strong>ely upstream <strong>of</strong> the streammouths. Such inspections would occur shortly after significant rainfall and stormw<strong>at</strong>er events.Machetes and weed-e<strong>at</strong>ers will be required to periodically trim veget<strong>at</strong>ion along selectedportions <strong>of</strong> the stream channel. The manual collection <strong>of</strong> solid wastes will also be necessary tominimize obstructions to stream discharge and effective tidal exchange.American Samoa Wetland/Stream Restor<strong>at</strong>ion and Enhancement PlanFebruary 2001, V<strong>at</strong>ia Wetland, Page 5-18

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