2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report years of greater tidal muting, the open water areas will be slightly larger, since the low tides won’t fall to as low an elevation as they would immediately following a dredge event, when tidal muting is minimized. Unvegetated Nest Site This includes Nest Sites 1, 2, & 3. They are topped with sand and groomed to appeal to targeted sensitive avian species that nest on such sites. Portions of the nest sites that have non-native vegetation growing at a high enough density as to preclude nesting by the targeted species were excluded from the total nest site area calculations and mapping instead as non-native vegetation. Urban/Developed The areas designated as urban/developed were comprised of paved streets, paved and unpaved oil field roadways and berm roads, recreational paths, oil pads, or highly disturbed areas adjacent to the residential neighborhoods or related to oil field operations and contamination remediation. Salt Marsh Transect Monitoring The results of the transect monitoring are presented in Table 1-2. At the bottom the table is a summary of the percent vegetative cover on each transect, disregarding any overlap of species, for all vegetation and for native species only. Summaries are also provided for native and non-native species, accounting for overlapping species within the transect. Figure 1-6 presents the mean coverage of native and non-native species at each of the five survey areas, allowing for overlap of species. The MPM had very little non-native cover and the FTB transects had none, however it should be noted that Rabbit Island, which is also located in the FTB, did have non-native species. The FTB transects are all located on the intertidal mudflats of the north and east shore, where conditions are unfavorable for the establishment of most non-native species due to regular tidal inundation. The non-native species at Rabbit Island occur at elevations above the highest high tides. 100 Mean % cover 80 60 40 20 Native Vegetation Non-native Vegetation 0 Rabbit Island Full Tidal Basin West MTB Central MTB East MTB Muted Pocket Marsh Figure 1-6. Mean percent cover (including overlap) of native and non-native vegetation by survey area (2008) The most abundant non-native species were the iceplants M. nodiflorum and C. edulis, with M. nodiflorum particularly abundant in the non-tidal portions of the central and east MTBs. The iceplant remaining in the west MTB was showing signs of stress from the introduction of tidal influence in March and will likely die in the coming year. Merkel & Associates, Inc. 29
Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report Table 1-2. Vegetation transect monitoring results (2008). Plant Species Observed Along Transects Percent Cover Scientific Name Common Name RI 1 RI 2 RI 3 FTB N FTB E1 FTB E2 FTB E3 WMTB 1 WMTB 2 WMTB 3 CMTB 1 CMTB 2 CMTB 3 EMTB 1 EMTB 2 EMTB 3 MPM 1 MPM 2 MPM 3 Native Species Sarcocornia pacifica Pacific pickleweed 14 50 32 10 8 100 36 88 48 76 28 82 74 42 16 4 Arthrocnemum subterminale Parish’s pickleweed 2 2 8 Distichlis spicata Saltgrass 26 4 26 58 6 76 14 6 4 4 Frankenia salina Alkali heath 2 6 2 10 4 4 8 34 4 24 Monanthochloe littoralis Shoregrass 14 Cressa truxillensis Alkali weed 12 18 4 Suaeda esteroa Estuary seablite 12 4 Batis maritima Saltwort 26 12 2 Limonium californicum Western marsh rosemary 2 Juncus acutus ssp. leopoldii Southwestern spiny rush 6 2 Atriplex prostrata Spearscale 2 Atriplex canescens var. canescens Four wing saltbush 12 Ruppia maritima Wigeon grass 18 26 36 Enteromorpha sp. (alga) Sea lettuce 2 6 Non-native Species Mesembryanthemum nodiflorum Slender-leaved iceplant 16 2 18 4 8 Bassia hyssopifolia Five hook bassia 18 12 12 8 2 2 Salsola tragus Russian thistle 4 Carpobrotus edulis Hottentot-fig 12 6 6 6 Polypogon monspeliensis Annual beard grass 6 2 Bromus madritensis rubens Red brome 2 Dead plant debris 14 2 14 14 10 4 4 8 18 Bare construction sidecast 8 12 10 8 Open water 4 4 2 34 Bare ground /mudflat 30 18 10 90 82 72 58 2 32 46 2 6 16 14 Total Percent Vegetative Cover Without Overlap (all species) 58 80 76 10 18 28 42 82 100 94 100 58 88 34 88 84 100 42 34 Total Percent Native Vegetative Cover Without Overlap 46 58 62 10 18 28 42 56 100 94 90 52 66 30 88 76 30 88 76 Total Percent Native Vegetative Cover With Overlap 50 62 78 10 18 28 42 68 106 124 106 54 80 32 102 92 124 46 36 Total Percent Non-native Vegetative Cover With Overlap 12 22 18 0 0 0 0 28 0 0 18 8 26 4 0 8 2 0 0 Total Number of Native Species within 1 m of Transect 5 6 5 1 1 2 2 4 3 4 3 2 3 2 3 3 9 6 6 Total Number of Non-native Species within 1 m of Transect 2 3 2 0 0 0 0 4 0 0 5 6 4 1 2 2 1 0 0 Mean Canopy Height (cm) 26 44 N/C 28 0 0 0 36 25 52 45 50 33 26 46 22 41 30 25 Merkel & Associates, Inc. 30
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2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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