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Tijuana River National Estuarine Research Reserve (TRNERR)

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Tijuana River National Estuarine Research Reserve (TRNERR) Tijuana River National Estuarine Research Reserve (TRNERR) Program Manager Reports Report Period: January 1, 2020 through June 30, 2020 TASK: REFUGE MANAGER REPORT Brian Collins, Refuge Manager, San Diego Bay NWR and Tijuana Slough NWR 1. PERSONNEL San Diego NWR Complex personnel have been mostly teleworking since mid-March due to the COVID-19 pandemic in efforts to reduce staff exposure to community transmission of the SARS-CoV-2 virus. We are working to catch up on a backlog of field tasks such as trimming vegetation along trails, removing trash, and overseeing construction contracts, work that we unable to accomplish during the earlier season work shutdowns due to COVID-19. Our staff and partners have been working hard to salvage the research and biological monitoring season. We are not yet able to authorize our volunteers to return, due to the ongoing risk of community spread of the virus. We miss them, immensely! We are however, happy to report that the San Diego National Wildlife Refuge Complex has hired two new permanent staff members. Julie Gonzalez is our new Park Ranger working on our Urban Wildlife Refuge program and Nancy Fernandez is our new Park Ranger working on public communications primarily via social media. 2. WILDLIFE Terns and Plovers Nesting season for Western Snowy Plovers and California Least Terns is still in process. Total nests for least terns so far this season is 97 north of the river with 106 south of the river at Border Field State Park. Plovers established 34 nests north of the river with 22 on the south side. Productivity estimates for this season are not yet available. Light-footed Ridgway’s rails This year conditions for our endangered Ridgway’s rails seem to have improved within the estuary since the river mouth’s most recent closure in 2017. While the populations in coastal wetlands throughout their range in southern California seem to be struggling, the population at Tijuana Estuary seems to have made a bit of a comeback from the severely low pair estimate of 29 pairs in 2019. In 2020, due to COVID-19 restrictions on field work at the height of the rail monitoring season, rigorous call counts were not feasible to conduct, but there seems to be significantly more activity detected in our marsh this season compared to last. We have been working for many years with many partners on our zoological propagation program for the species (San Diego Zoo Global, SeaWorld San Diego, Living Coast Discovery Center, California Department of Fish and Wildlife, and others). We are also now working with a team of biological researchers from USGS, the University of Idaho, and Idaho State University on several new fronts. We are collaborating on the development of a modified standardized monitoring protocol for the species, a genomics analysis of individual rails across the range of the Ridgway’s rail feeding chick a beetle along North McCoy Trail species, and a habitat usage model using June, 2020 (photo courtesy of David Arkin). satellite telemetry data of individual bird movements, comparing detections with habitat metrics using remote sensing data. Wild birds live-trapped in the field and birds released from our zoological breeding program are being fitted with satellite tags in 2020 to compare movements, habitat usage, and survivorship of young of the year rails bred in captivity with those born in the wild. We now have a number of rails in the estuary that have been fitted with satellite transmitters to study the movements of these birds. The map below shows signals from a number of young rails over a several day period in late July. Tijuana River Mouth We continue monitoring the situation at the river mouth and are prepared to reopen the mouth when and if it closes Preliminary Satellite tracks of 7 individually radio-tagged rails at again to tidal circulation. As a reminder, Tijuana Estuary July 2020 (Image courtesy of Dr. Courtney Conway) the mouth closed 4 times in 2016 and early 2017 leading to severely detrimental effects to the wetland ecosystem and the wildlife community that inhabits it. Water quality within the estuary has been poor all summer long with near-constant wastewater flows coming into the wetland from sources in Mexico. This is unusual, as most wastewater flows historically have occurred primarily during the wet seasons. We have not observed large-scale wildlife impacts resulting from these flows, although the dissolved oxygen in the water looked consistently low through July, likely indicating a eutrophic condition. Ironically, the nutrients contained within these flows serve to fertilize the marsh plants, and this has led to the Tijuana Estuary marsh hosting the thickest emergent marsh vegetation in the California range of the light-footed Ridgway’s rails. The degree of emergent cover is associated with higher survival probability for these secretive marsh birds whose population was severely impacted by the closure events in 2016. Biological Inventory and Monitoring (I&M) I reported earlier that the USFWS I&M staff have been assisting the San Diego NWR Complex with collecting and archiving all relevant biological data generated by or about the refuge past and current. Through this formal process, we are creating a record that identifies key ecological attributes and associated indicators of the health of priority Refuge resources. The project also archives historical data to inform the development of a Refuge I&M Plan that will serve to inform future management of our precious wildlife communities and wetland habitat resources. 3. PUBLIC USE PROJECTS Imperial Beach Boulevard Enhancement Project The City of Imperial Beach’s improvement project along Imperial Beach Blvd is nearly completed. Observation Deck Replacement The replacement of the two decks near the corner of 3rd and Imperial Beach Blvd is nearing construction. We expect work to start in August 2020, with project completion sometime in September or early October. This project will serve to link into the City New Tijuana Estuary Entry area at 3rd and I.B. of Imperial Beach’s green infrastructure developed by the City of Imperial Beach in improvement project along I.B. Blvd. collaboration with Reserve staff. Engineering Drawing of Proposed Deck near 3rd and I.B. with Accessibility Ramp Seacoast Drive Interpretive Plaza The USFWS Seacoast Drive Interpretive Plaza project is complete, and provides accessible access to a newly refurbished and redesigned interpretive area that includes four interpretive panels, two benches and two telescopes (telescopes to be installed in late summer). Southern Border Fuels Management Initiative The USFWS received funding from the Department of Homeland Security to conduct fuels control to reduce the risk of wildfire, improve USFWS Seacoast Drive Interpretive Plaza the patrol conditions for Border Patrol field agents, and to improve the habitat conditions on the Refuge by the removal of invasive plants, especially targeting giant cane, tamarisk and castor bean. Removal work of invasive exotic species associated with this project within Tijuana Slough NWR is slated to begin around September 1st. We have contracted with the California Conservation Corps to conduct the field work. Mosquito Abatement We continue collaborative work with the County of San Diego Department of Environmental Health Vector Control Division on conducting vector control and Southern Border Fuels Management Initiative- treatment area outlined in red surveillance within the Tijuana Estuary. Bonhomme Richard Fire On Sunday July 12th, the USS Bonhomme Richard assault ship caught fire while docked at Naval Station San Diego. Firefighters and sailors battled the fire for four days. USFWS staff were part of the unified regional response team organized by the Navy and US Coast Guard. Our role was to assist the unified team in deploying mitigation measures in response to this emergency to reduce the likelihood of the potential for significant contamination of the San Diego Bay’s ecosystems. Fortunately, large-scale fuel spills into the bay were avoided, but in preparation for that potentiality, floating booms were deployed in many areas surrounding sensitive habitats within the bay. Although there were no significant oil or fuel spills into San Diego Bay, aqueous film forming foam (AFFF) was used to smother the fire. A ‘minimal’ amount of AFFF, a mixture of water and highly concentrated detergent, made it into the bay. More rigorous water quality testing near the incident site may be needed to understand its possible impact on the wetland ecosystems of San Diego Bay. Boom deployment locations (image courtesy of US Coast Guard). Booms deployed in the Sweetwater River Flood Control Channel (all booms have subsequently been removed) TASK: OVERSIGHT AND IMPLEMENTATION OF RESERVE OPERATIONS Chris Peregrin, TRNERR Reserve Manager, California State Parks 1. Coordinated Implementation of Reserve Programs The Reserve Manager worked to respond to the Necessary Action and the Recommendations identified in the Reserve’s 312 findings. The Reserve Manager attended the annual NOAA West Coast Regional meeting in Oakland, California January 22-24. The Reserve Manager worked closely California Coastal Commission & State Coastal Conservancy staff among other NOAA programs. The Reserve Manager contributed to the NERRA virtual board meeting January 27. The Assistant Reserve Manager has been assigned the role of Cooperating Association Liaison for the Southwest Wetlands Interpretive Association and is now attending the regular SWIA Board Meetings. The Reserve Manager continued coordination with CA State Parks Peace Officers and seasonal lifeguards to support Reserve operations through public safety. The Reserve Manager continued work with the Education Coordinator and TRNERR Program Managers to further the development of the Reserve’s Interpretive Master Plan. The contract with the consultant was extended through fiscal year 2020 (see also Education). The Reserve Manager and the Assistant Reserve Manager continued regular communication with State Parks San Diego Coast District (SDCD) Natural Resources team to further align programmatic support and integration (see also Stewardship).
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