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

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Bolsa Chica Lowlands Restoration Monitoring 2008 Annual Report I. ECOLOGICAL MONITORING PROGRAM The ecological monitoring stations were established using direction provided in the Bolsa Chica Lowland Restoration Project Biological Monitoring and Follow-up Plan (Monitoring Plan), as well as observations made in the field at the time of station determination. Figure 1-1 presents the general sampling locations for water quality, benthic infauna, fish, and birds. Appendix 1-A summarizes the dates of each field event. Within each of the following sections, more detailed maps of sampling locations are presented as needed. 1.1. VEGETATION/HABITAT MONITORING Introduction The distribution, composition, and evolution of vegetation communities and unvegetated habitats were monitored through the use of aerial photography and quantitative transect methods. The Monitoring Plan called for vegetation monitoring to be initiated in Year 2 of the program. Methodology Habitat Mapping To map vegetated and non-vegetated habitats, the Bolsa Chica study area was contract flown on May 13, 2008 to photograph the site at a scale of 1:4,800 from true vertical position on 9”x9” false-color infrared (IR) film. The photos were flown at approximately 1230 hours at a measured FTB tide of approximated +0.3m NAVD88. This allowed photography of as much exposed intertidal habitat as possible while lighting and weather conditions were suitable for the photography. Additionally, a single 1:19,344 true color spot aerial photograph was taken coincident with the IR imagery. This photograph assisted in providing an additional tool for habitat interpretation and mapping as well as served as a base map for all field monitoring efforts and reporting. Following survey flights, the aerial images were digitally scanned and georeferenced to create a tile mosaic image for interpretive mapping. Once the images were correctly registered to the project site, heads-up digitization of vegetation boundaries was performed to map communities in accordance with CDFG Holland classification codes (Holland 1986). Additional codes were used as necessary to supplement the vegetation codes with biologically important marsh zones, non-vegetated communities, and marine habitats that are lacking in the Holland system. These codes followed the Nearshore Habitat Classification system developed for coastal marine mapping (M&A 2003). The draft digitized habitat maps were printed and taken into the field for ground-truthing. Once completed, the habitat maps were updated and map products and summary statistics of habitat acreage and distribution across the various project components were generated. Future mapping efforts will examine habitat change relative to spatial and numeric parameters reported here. Eelgrass (Zostera marina) was introduced into the FTB through a transplant conducted by M&A in August 2007. Eelgrass was harvested from the Cabrillo Beach region of the Port of Los Angeles and transplanted to 15 sites in the FTB in 45x5m blocks. A total of 0.4 hectare (0.9 acre) of eelgrass was transplanted. The distribution of eelgrass present one year later was mapped on June 30, 2008 by a separate methodology from the other vegetation mapping described above. The FTB was surveyed for eelgrass from a boat using a sidescan sonar operating at 600 kHz scanning out 20 Merkel & Associates, Inc. 17
Muted Pocket Marsh STATION 1 wq1 STATION 3 (benthic only) East Water Control Structure Tidal Monitoring Station wq2 STATION 2 Water Quality Stations Inlet Bathymetric Monitoring Avian and Vegetation Study Boundary 0 100 200 400 600 800 Meters Monitoring stations Bolsa Chica Lowlands Restoration Project Figure 1-1 Merkel & Associates, Inc.
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2008 Annual Monitoring Report (pdf 10.9MB) - Bolsa Chica ...

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