10/31/2010. Rough Project History. Study Questions. Study 1: Grazing Treatments. Study 1 Results. Study 1 Locations

Transcription

1 1/31/21 YOSEMITE TOAD ADAPTIVE MANAGEMENT STUDY Rough Project History Period Activity 24 Scope, ojectives, nd study pln Erly Pln reviewed J. Bldwin, cdemics, USFS stff Spring/Sum Study pln revised Sum Study 1 sites instrumented, methods refined 26 Study 1 & 2 27 Study 1 & 2 28 Study 1 & 2 29 Study 1 & dt nlysis 21 Study 1 & dt nlysis Sierr Nevd Reserch Center, UC Berkeley, nd UC Dvis Study Questions Study 1. Yosemite tod nd hitt response to fencing medows compred to grzing t SNFPA riprin stndrds nd guidelines? Study 2. Reltionships etween grzing, medow chrcteristics, nd tod occupncy? Study 1: Grzing Tretments Fence the Whole Medow () no grzing in medow Fence the Breeding Are () fence the potentil reeding re in medow Grze (GRZ) entire medow in ccordnce with Riprin S&G. Study 1 Loctions o Grzing tretment effects on young of the yer tod counts nd occupncy of reeding pools o Grzing tretment effects on wter qulity nd cover in tod reeding pools o Connections etween reeding pool hitt fctors nd tod occupncy 1

2 1/31/21 Do Yosemite tod nd hitt enefit from fencing medows compred to grzing medows? Breeding pool occupncy hypothesis is not supported (stt or grphicl nlysis). s Yosemite Tod Hypothesis GRZ Occupied Breeding Pools h CON GRZ Young of the yer hypothesis is not supported (stt or grphicl nlysis) YOY h CON GRZ o Grzing tretment effects on young of the yer tod counts nd occupncy of reeding pools o Grzing tretment effects on wter qulity nd cover in tod reeding pools o Connections etween reeding pool hitt fctors nd tod occupncy Breeding Pool Hitt o Wter Qulity Turidity, EC, NO 3 -N, NH 4 -N, PO 4 -P, TP, TN, DOC o Cover vegettion cover, wter depth o Wter Temperture Breeding Pool Hitt Hypothesis 1: Fencing will reduce nutrients, conductivity, nd turidity. Hypothesis 2: Fencing will increse pool depth, vegettive cover, nd reduce temperture. These hypotheses re not supported (sttisticlly). All WQ constituents re very low. Tempertures re low. Nrrow rnge for ll constituents. 2

3 1/31/21 o Grzing tretment effects on young of the yer tod counts nd occupncy of reeding pools o Grzing tretment effects on wter qulity nd cover in tod reeding pools o Connections etween reeding pool hitt fctors nd tod occupncy Occupied pools were sttisticlly shllower, wrmer, more nutrient enriched (cm) Wter Depth ( Mx Dily T Men Dily T Wter Depth ( C) Temperture yers 1-3 yers 4 yers Tods reeding pools with lentic (non-flowing) conditions every yer Lentic pools were every yer. They hd sttisticlly higher nutrient concentrtions, were shllower, nd wrmer thn lotic pools. Breeding Are Flow Conditions Lotic Lentic % Occupied % Occupied % Occupied Totl P (ppm).1.. Lotic Lentic 1... Tot l N (ppm) Fence Breeding Are Study 2 o Use outside fenced res over stndrd o Risk with no pprent enefit for tod Annul herceous utiliztion (%) Yer GRZ Outside Fence Reltionships etween grzing, medow chrcteristics, nd tod occupncy 3

4 1/31/21 Study 2 sites SNF Study Site Attriutes Medow Attriutes Elevtion (ft) Are (c) Annul Biomss (ls/c) Percent Use Minimum Men Mximum Mngement Unit Attriutes Cross-sectionl longitudinl survey of 24 medows: Allotment Blsingme Dinkey Ptterson Mtn Are (c) Permitted AU On/Off Dtes 6/16-9/2 6/16-9/2 6/16-9/2 2 mi SNF Study Site Attriutes Tod occupncy of medows (no. yr over 3 yr) is higher in wet medows Cow occupncy of medows (use, fecl lod) is lower in wet medows Occupncy Rte (%) 6 3 tod cttle 4 se (%) Study Fig. medows 3. rnging from from moist hydrologic (grss/for) scores to of 1 ( dry : wet grss/for (wet crex) ( wet : wet Crex Ling et l. Report 21; ll sites re sesonl flow sites Fecl (pts/h) 6 3 cttle Medow Wetness Scle Moist Dry Wet 2 Biomss U Forge qulity is higher in moist medows Cows seek out the highest qulity diet within medow nd lndscpe Tod occupncy of medows ws predicted y medow wetness, not cttle utiliztion mesured y herceous use Biomss Use (%) Totl P (%) Protein (%) Crude P Medow Wetness Hydrology -.3** Plnt Biomss Forge Qulity Production.2**.47* Livestock Utiliztion Herceous use 3.71** Tod Presence Tods oserved 3 ADF (%) ADF CP TP Medow Wetness Scle Moist Dry Wet 2 Mixed Effects Byesin Structured Eqution Model 4

5 1/31/21 Predicting tod occupncy of medows, nd tod conservtion, seems to require roder focus thn grzing Climte Chnge Pst Disturnce Conifer Encroch Uplnd WS Mnge Medow Restortion Predtor dynmics C. fungus Airorne chemicls Cttle use nd Yosemite tod occupncy re inversely relted to medow hydrology Tods prefer hitt ssocited with wetter medows Cttle select nutritious diet ssocited with drier medows Cttle nd tods pper to hve inherently different hitt selection criteri Riprin S&Gs? Cliforni Rngelnd Wtershed Lortory