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

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Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report central and east MTBs) are species that are tolerant of highly saline soils. This relictual marsh is almost entirely composed of large expanses of pickleweed (Sarcocornia pacifica and Arthrocnemum subterminale). The pickleweed quality varies throughout the site from tall and robust, to short in stature and desiccated. Other species common in the salt marsh in low densities included: salt grass (Distichlis spicata), saltwort (Batis maritima), and alkali heath (Frankenia salina). The majority of this salt marsh habitat is of moderate quality based on its fairly expansive nature, isolation from human disturbance, and limited infestation by exotic and upland species. While there is low plant diversity within this habitat, such conditions are normal for coastal salt marsh habitats and especially so for non-tidal marshes that experience hypersaline sediment conditions and the environmental extremes of wet and dry seasons and years. More functional coastal salt marsh habitat is now present in the FTB (on Rabbit Island) and Muted Pocket Marsh, both of which received daily tidal flushing following the restoration completion. Additionally, in March 2008 the west MTB was opened to muted influence from the FTB, with the salt marsh receiving daily tidal flushing for the first time in many decades. This resulted in the inundation of large areas of pickleweed for some or nearly all of each day. In some areas the inundation frequency may be greater than the tolerance of the pickleweed; those areas are expected to convert to open mudflat in future years. As noted above, cordgrass was not included in the coastal salt marsh mapping in order to better track its spread over time. Disturbed Southern Coastal Salt Marsh This habitat category was used to distinguish areas of southern coastal salt marsh that were degraded due primarily to disturbance by heavy equipment and vehicles associated with both the construction elements of the restoration program and the on-going contamination remediation activities within the oil field. This category was also used for the unvegetated sidecast piles of sediment place on either side of the channels that were dug out of the marsh as part of the restoration of the MTBs. These will be re-categorized in future assessments if salt marsh vegetation becomes reestablished. Sidecast mounds remaining from channel excavation. Cordgrass New cordgrass growth with flowers. One year post-transplant, 196 m 2 of cordgrass was mapped at 10 of the 14 transplant sites (Figure 1-4). At most locations cordgrass was present in only portions of the original transplant site, and in some cases had spread laterally some distance out of the site. Within plots of cordgrass the shoot density ranged from 2 to 98 shoots/m 2 , with a mean of 23 shoots/m 2 . The canopy height ranged from 9 to 85 cm, with a mean of 52 cm. Nearly all cordgrass was flowering, with seeds seen scattered on the mudflat around the plants. Merkel & Associates, Inc. 23
August 22, 2007 cordgrass transplant sites - 0.3 hectare (0.7 acre) 8 9 August 21, 2008 cordgrass distribution - 0.02 hectare (0.05 acre) Numbers are transplant IDs 7 11 10 1 12 6 5 4 3 2 13 14 0 200 400 800 Meters Full Tidal Basin cordgrass distribution Bolsa Chica Lowlands Restoration Project Figure 1-4 Merkel & Associates, Inc.
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PM 50 66 47 Full Tidal Basin Future
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Total Future Full Tidal Basin FFTB
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Western Snowy Plover Nesting at Bol
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2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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