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

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Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report Transplant site 6 may have belowground rhizomes that will persist and support new growth in the future. Sites 11, 12, and 13 are not expected to recover because they are at a slightly lower elevation than the other sites. Photos taken of each transplant site are presented in Appendix 1-C along with the mean shoot density and mean canopy height at each. Photos of Sites 12 and 13 are included. Mule Fat Scrub Mule fat scrub occurs primarily in the southeast portion of the Seasonal Ponds, where perennial freshwater input supports several freshwater vegetation communities, and sporadically along the eastern boundaries of the study area near other sources of freshwater. This habitat is nearly monotypic mule fat (Baccharis salicifolia). Coastal Sage Scrub Baccharis scrub occurring within the project site was mapped as coastal sage scrub. This habitat is composed almost entirely of coyote brush (Baccharis pilularis) and Emory’s Baccharis (Baccharis emoryi) various non-native weeds such as radish (Raphanus sativus) and black mustard (Brassica nigra). Baccharis scrub is a sub-class of coastal sage scrub that is generally almost entirely dominated by coyote brush and is typically indicative of greater soil disturbance, higher moisture levels, and/or sandier soils. This vegetation occurs near the more highly disturbed eastern boundary of the study area, however it was mapped in such limited areas that it is not visible on the habitat map. Coastal and Valley Freshwater Marsh A few small areas of coastal and valley freshwater marsh were mapped in the southeast corner of the seasonal ponds. The freshwater marsh is composed primarily of broad-leaved cattail (Typha latifolia) and narrow-leaf cattail (Typha angustifolia), with occasional California bulrush (Scirpus californicus) and prairie bulrush (Scirpus robustus) nearby. These small freshwater marshes persist on the margins of the coastal salt marsh due to perennial freshwater input as both surface runoff and groundwater seepage from adjacent lands. Southern Arroyo Willow Riparian Forest A single mature stand of arroyo willow (Salix lasiolepis) occurs adjacent to the freshwater marsh and mule fat scrub in the southeastern portion of the Seasonal Ponds. This willow stand receives high amounts of seepage from the adjacent bluff as well as surface runoff sources and has a small drainage running through it out onto the salt panne. Eelgrass Eleven months post-transplant, 0.8 ha (2.0 acres) of eelgrass was mapped in the FTB on June 30, 2008, marking a doubling in area from the 0.4 ha (0.9 acre) of eelgrass originally transplanted in 2007. (Figure 1-5). Eelgrass had persisted at 13 of the original 15 transplant sites and spread extensively into the southern portions of the basin. The two transplant sites that were positioned in the center of the basin did not appear to have persisted through to the June 2008 survey. Due to the increasing tidal muting of the FTB in 2008, eelgrass was able to establish at higher elevations than it typically would, often growing at the base of the riprap in the outer portions of the FTB. Eelgrass in the FTB. Merkel & Associates, Inc. 25
August 24, 2007 eelgrass transplant sites - 0.3 hectare (0.8 acre) June 30, 2008 eelgrass distribution - 0.8 hectare (2.0 acres) 0 200 400 800 Meters Full Tidal Basin eelgrass distribution Bolsa Chica Lowlands Restoration Project Figure 1-5 Merkel & Associates, Inc.
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2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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