Top

Heal the Bay Blog

Mar. 23, 2016 — The Coastal Commission made the right decision to support removal of invasive iceplant in the always contentious Ballona Wetlands, writes staff scientist Katherine Pease.

Iceplant, the green succulent plant found flanking our freeways, is well-known to many Angelenos. It’s also highly invasive and problematic, now that it’s taken over significant areas of coastal habitat and dunes in California.

The California Invasive Plant Council classifies iceplant’s potential impact on native ecosystems as high and you can find it listed as one of the “Terrible 10” invasive plants of Southern California.

Iceplant has negative impacts by crowding out native plants, creating a monoculture that provides low-value habitat. The overall impact is a reduction in biodiversity in plants and animals.

A proposed project to remove iceplant on three acres of the Ballona Wetlands Ecological Reserve sought approval from the California Coastal Commission at a March 10 meeting. The California Department of Fish & Wildlife and the Bay Foundation created the plan, which calls for removing iceplant by placing tarps over the iceplant and having it killed by solarization.

It’s a tried-and-true method to remove invasive iceplant in a non-invasive way, ironically enough. It has been used in the Carpinteria Creek Mouth project in Carpinteria and in the Channel Islands Restoration Projects in Santa Cruz and Anacapa Islands. Further, any wildlife would easily be able to escape from underneath the tarps because ample space is left between the garden staples used to anchor the tarps down.

Heal the Bay supports this iceplant removal project, which will help to restore ecological function to the degraded wetlands.

The Ballona Wetlands are particularly important because they provide unique and increasingly rare open space and wetland habitat in urban Los Angeles and Southern California. The benefits that wetlands provide (such as wildlife habitat, water purification, buffering against flooding, and recreation) can only be achieved when they are healthy and functioning.

In areas like Southern California, which have faced unprecedented wetland loss (upwards of 95%), it is extremely important to protect and restore these valuable habitats. The remaining 600 acres that comprise the Ballona Wetlands Ecological Reserve have been highly altered and degraded.

Today, more than half of the reserve has been taken over by non-native invasive plants such as mustard and iceplant1, creating habitats with reduced ecological, social, and economic value. To restore function, projects like the removal of iceplant need to occur, along with larger-scale restoration efforts that are planned. Restored wetlands show marked signs of success, such as increased biodiversity, carbon sequestration, improved water circulation, and improved water quality2.

Last year, Heal the Bay joined forces with our partners at Friends of Ballona Wetlands, Surfrider, and Los Angeles Waterkeeper to craft the Nine Principles of Wetland Restoration, which outline practices of successful scientifically-based wetland restoration projects. A total of 13 respected environmental groups signed on in support of these Principles. Heal the Bay and our partners have been sharing the Principles with government agencies and elected officials to educate them on the importance of wetlands and the need for their restoration in a manner consistent with the Principles.

The proposed iceplant removal project follows the Principles of Wetland Restoration because it is based in scientific evidence, native plants and wildlife will be safeguarded, other alternatives were examined, and monitoring the site response to the restoration activities will occur.

Despite numerous scientific studies showing that the Ballona Wetlands are highly degraded and continue to deteriorate, the hearing for the proposed project met with some opposition, led by the Ballona Institute. (The plan also met with public support at the meeting from Friends of Ballona Wetlands and Team Marine from Santa Monica High School).

Sitting in the hearing, I could not believe that an argument was being made to keep invasive iceplant. I felt like I was in an alternate reality where up was down, native plants were bad, and iceplant was good.

Listening to the opponents’ testimony, I surmised that their evidence was not based in science as I understand it. Their arguments focused on the beliefs that iceplant provides important habitat for numerous native species and that animals (the Pacific chorus frog in particular) would be killed by the plastic tarps.

Photographs were shown as “evidence” that there were many native animals that depend on the iceplant as habitat. First, photographs are not scientific evidence, and there was no further evidence showing that native species rely solely on this habitat or really depend on it. Many species are adaptable and will use habitat that is less than ideal, but that doesn’t mean that they need it or that some other habitat with native plants and animals wouldn’t be better.

The Pacific chorus frog was touted as a species that depends on the iceplant habitat and would be “endangered” by the removal of iceplant. I studied this species of frog for my doctoral dissertation at UCLA. As I said in public testimony, I have a great fondness for this frog but I also am not worried about them and they are not a species of conservation concern. They are widespread and highly adaptable; among our local native amphibians, they are the most resilient to human disturbance. That doesn’t mean that we should be careless with them. The proposed project takes care to protect wildlife while tarping and these frogs move around easily, using a wide variety of habitats, and do not rely on iceplant habitat in any way.

Further, the opposition cited a recent New York Times article as “scientific evidence” that invasive species aren’t necessarily bad. Aside from taking issue with a New York Times article being called scientific evidence, I will also say that I had previously read this article and do agree that not all non-native species are equal and not all should be viewed as bad or assumed to have negative ecological impacts.

However, as the article states, “some alien species are undeniably harmful” and I would put iceplant in that category. Numerous scientific studies have documented iceplant’s negative impacts on soil chemistry, native species, and hydrology3.

The opponents of the project stated a belief in the principle of “first do no harm.” And strangely enough, I agree with them on that point but our conclusions differ: By doing nothing, we are doing harm.

The Ballona Wetlands have such great potential but desperately need restoration, whether it is in the removal of invasive iceplant, reconnecting the creek to the wetlands, or removing layers of fill.

Sometimes you need to act – smartly and with care – to protect something valuable. Letting nature “take its course” isn’t wise when manmade impacts are the very thing changing the course of events in our few remaining wetlands.

Thankfully, the Coastal Commission agreed that the proposed project is beneficial and approved the project. Overall, this is a small restoration project; bigger projects are to come and opposition will continue. Heal the Bay will be there, along with our partners, to support and fight for a healthy and functioning ecosystem at Ballona Wetlands.

The California Department of Fish & Wildlife, which oversees the Ballona Wetlands, expects to release its long-awaited Environmental Impact Report on its proposed restoration of the entire wetlands sometime this summer.    

Friends of Ballona Wetlands volunteers removing iceplant                                           Friends of Ballona volunteers removing iceplant from the wetlands as part of a separate initiative.

 

Citations:

[1] http://docs.ballonarestoration.org/BWER_Habitat_Descriptions_TBF_2013_final.pdf

[2] Abramson et al. (2015) Malibu Lagoon restoration and enhancement project comprehensive monitoring report (year 2), Retrieved from: http://www.santamonicabay.org/wp-content/uploads/2015/06/Malibu-Lagoon_C… ; Richardson CJ et al. (2011) Integrated stream and wetland restoration: a watershed approach to improved water quality on the landscape. Ecological Engineering37: 25-39; Espinoza M et al. (2011) Habitat use, movements and site fidelity of the gray smooth-hound shark (Mustelus californicus Gill 1863) in a newly restored southern California estuary. Journal of Experimental Marine Biology and Ecology 401: 63-74. Keller JK et al. (2012) Soil organic carbon storage in restored salt marshes in Huntington Beach, California. Bulletin of the Southern California Academy of Sciences 111: 153-161;

[3] Albert ME (1995) Portrait of an invader II: the ecology and management of Carpobrotus edulis. CalEPPC News 3: 4-6; Conser C & Connor EF (2009) Assessing the residual effects of Carpobrotus edulis invasion, implications for restoration. Biological Invasions 11: 349-358; D’Antonio CM & Haubensak K (1998) Community and ecosystem impacts of introduced species. Fremontia 26: 13-18; D’Antonio CM & Mahall BE (1991) Root profiles and competition between the invasive exotic perennial, Carpobrotus edulis, and two native shrub species in California coastal scrub. American Journal of Botany 78: 885-894; Vila M et al. (2006) Local and regional assessments of the impacts of plant invaders on vegetation structure and soil properties of Mediterranean islands. Journal of Biogeogrpahy33: 853-861



Feb. 05, 2016 — Staff watershed scientist Katherine Pease bugs out about our major legal victory in Malibu Creek.

In May 2013, I stood in front of a packed meeting room in Agoura Hills, filled with West Valley residents concerned about rumors of rate increases from their local water district. My job was to convince them to care about aquatic bugs as much as their water bills. Needless to say, I faced an uphill battle.

Well, two years later, I’m proud to say that the bugs won.

This week a federal court upheld pollution reduction requirements created by the EPA – and informed by data collected by Heal the Bay scientists – to protect creatures both large and small in impaired Malibu Creek.

Back in 2013, the federal EPA established a formal Total Maximum Daily Load (TMDL) – basically a numeric pollution reduction requirement – to address the fact that Malibu Creek, some of its major tributaries, and Malibu Lagoon had very poor or impaired biological communities.

Katherine Pease at Malibu CreekBiological communities in streams are assessed through the different types and numbers of aquatic bugs (or benthic macroinvertebrates) that live there. Think of snails, worms, crayfish, and larval stages of dragonflies, damselflies, black flies, and mayflies. Which brings us back to why we or anyone should care about bugs.

Benthic macroinvertebrates are relatively stationary, ubiquitous, and they show a diversity of responses to stressors, making them an ideal indicator group of biological health. The biological condition of a stream tells a meaningful and comprehensive story of the condition of the stream’s water quality and habitat. A stream’s benthic macroinvertebrate community provides insights into its ecology, incorporating the effects of many factors that are difficult or impossible to replicate in a laboratory setting.

In essence, these bugs are an excellent indicator for the overall vibrancy of the stream.

For example, is the stream filled with only bugs that can tolerate polluted water? Or, is there a diversity of bugs that are sensitive to pollution in the creek? Healthy streams mean healthy watersheds, and healthy watersheds mean healthy cities.

The TMDL identified two main factors impairing the biological communities: high levels of nutrients and sediment. EPA came to that conclusion after completing a careful scientific analysis of water quality and biological data from the Malibu Creek Watershed.

One of the major sources of data came from Heal the Bay’s Stream Team. Since its inception in 1998, Heal the Bay citizen science volunteers and staff have been collecting water quality data monthly and conducting biological assessments yearly (since 2000) in the Malibu Creek Watershed.

These data helped to identify specific problems with the biological community and their sources. Sediment and nutrients both create poor habitat for aquatic bugs. Sediment blankets the stream bottoms, choking out prime habitat and diversity. Nutrients like phosphorous and nitrogen cause excess algal growth, which also can impair stream bottoms. (You can read more about these challenges and our proposed solutions in our detailed study here.)

The Tapia Water Reclamation Plant, which treats wastewater and discharges the treated water to Malibu Creek, has been a significant source of nutrients to Malibu Creek. While the effluent generally meets a high standard and contains low bacteria counts, the treated water still contains high levels of nutrients, specifically nitrogen and phosphorus.

The operators of the Tapia plant (the Las Virgenes-Triunfo Joint Powers Authority or JPA) objected to the new pollution limits and sued EPA to nullify the TMDL in the fall of 2013. As part of its challenge, the JPA questioned EPA and Heal the Bay’s science. They also argued that the costs of lowering nutrient levels in treated wastewater would be excessive. Because of the importance of the TMDL, Heal the Bay and our environmental partners NRDC and LA Waterkeeper intervened in the lawsuit, supporting the EPA.

We are very happy to report that this week that the TMDL has been upheld in court, thanks to good science and strong legal representation by NRDC.

We stand behind the science informing this important pollution limit, and we are proud that Stream Team data contributed to this process, which will ultimately improve the water quality and biological communities of our local streams and lagoons.

While the financial costs of protecting local streams need to be weighed carefully, we also need to weigh the environmental costs of not acting to preserve healthy watersheds – and what that means for water quality and wildlife that use the streams, including humans.

We should be creative in thinking about our water future, and how water quality and water supply are connected. In this time of drought, there are financially and environmentally strong investments in technology, like water recycling, which will reduce discharge to creeks, clean up water pollution, and help enhance our local water supplies.

Thankfully, the JPA is evaluating increasing water recycling as an option for the future health of Malibu Creek and local residents. This win is also a reminder that even though they may seem small and insignificant, aquatic bugs loom large. They tell us important information – like whether you can drink the water in your local stream, swim in it or eat the fish in it – if we just pay attention.

Photograph of the author courtesy of the Ventura County Star