Our results revealed that in monocultures warming reduced pot biomass by 15.8% but warming led to overyielding in mixtures by 33.3%. Tropicalization strengthens consumer pressure on habitat-forming seaweeds. . Kelp forests are vital to a diversity of marine species, new research shows, just as Charles Darwin predicted during his initial visit to the Galapagos Islands. Given known ecological constraints (nutrients and temperature), we found a substantial suitable area (ca. Restoring seaweeds: does the declining fucoid, Marzinelli, E. M., Leong, M. R., Campbell, A. H., Steinberg, P. D., and, Vergés, A. (1976). As a case study, we then apply the Society for Ecological Restoration’s 5-star evaluation to Operation Crayweed, Australia’s primary example of kelp forest restoration. , increases faunal diversity through physical. Campbell, A. H., Marzinelli, E. M., Vergés, A., Coleman, M. A., and Steinberg, P. D. (2014). Australian Kelp Restoration Network Bringing together researchers, fishers, government, industry and the community in conserving and restoring kelp forests Kelp forests dominate the rocky reefs of temperate Australia, where they can grow up to 40 metres tall. Johnson, C. R., Chabot, R. H., Marzloﬀ, M. P., and Wotherspoon, S. (2017). It has evolved, from pilot restoration attempts in 2011 (2 sites) through, to restoration at the scale of loss in 2018 (11 sites across. About 90% of the forests … Project management and monitoring of the multiple Operation Crayweed sites is estimated at an additional ∼US$18,500 p.a. For now, the kelp forests remain a completely unique way to experience the wilderness of our island. Biology and ecology of the globally signiﬁcant kelp. Over the last century, they have been the focus of extensive research, … abalone; Marzinelli et al., 2014). Ambrose, R. F. (1994). doi: 10.1016/0044-8486(79)90127-3. Yoon, J. T., Sun, S. M., and Chung, G. (2014). Verdura, J., Sales, M., Ballesteros, E., Cefall, M. E., and Cebrian, E. (2018). 3.Regardless of which trajectory is followed, tropicalised systems represent largely novel ecosystem configurations. of Experimental Marine Biology and Ecology. Extreme climactic event drives range contraction of a habitat-forming species. As foundation species, kelp support productive and species rich communities; however, the effects of kelp structure on mobile species within these complex natural systems are often difficult to assess. Overall, no single method of kelp forest restoration is suitable for all situations, but outcomes can be optimized by ameliorating the driver(s) of kelp decline and achieving ongoing natural recruitment of kelp. human consumption, livestock feed, biofuel, nutraceuticals, opportunities and economic incentives to help fund restoration, eﬀorts and thus contribute to the “restoration economy”, Kelp forests can also modify local hydrography and bolster, coastal defenses by dampening ocean swell and decreasing, service should be given special consideration with regards to, forecast increases in sea level and storm activity due to climate, Kelp and associated macroalgae also play an important, role in Indigenous Australian culture and tradition (reviewed, medicinal practices, clothing, food, shelter, and as domestic. However, increasing the scalability of kelp forest restoration, to the seascape-scale remains a considerable challenge, as does, restoration in response to climate change where drivers of decline, cannot be readily ameliorated (e.g., ocean warming). Babcock et al., 2010; Reed et al., 2017), especially for species with limited dispersal (e.g. This makes it possible to imagine a world where we might one day invest carbon credits in kelp farms or where wild forest restoration might count as mitigation. Dense giant kelp (Macrocystis pyrifera) forests were previously an iconic feature of the Tasmanian coast, but loss of ~95% of these giant kelp forests has seen them listed as an endangered marine community in Australia. Workﬂow and decision framework for kelp forest restoration. Phillips, J. We compared epifaunal diversity ... Craig R. Johnson, Kelp Forest Restoration in Australia, Frontiers in Marine Science, 10.3389/fmars.2020.00074, 7, (2020). facilitated adequate recruitment to maintain the kelp canopy; illustrating the importance of minimum patch sizes and densities, Given the rate of environmental change that is inﬂuencing, coastlines worldwide, and that some drivers of kelp decline, cannot be easily ameliorated (e.g., ocean warming), there is, growing recognition of the need to plan adaptively and to, consider the restoration of novel, more-suitable, species (, While we are aware of no published work implementing these, strategies for kelp restoration, research in Australia is currently, pioneering the identiﬁcation of warm water-tolerant seaweed, genotypes as the basis of future restoration eﬀorts (, Estimating the costs of implementing eﬀective kelp forest, restoration in Australia is diﬃcult given the few examples to, date. In, Australia, signiﬁcant declines of kelp have occurred in Western, in many locations globally, drivers of kelp forest decline include, both physical and biological factors (also see, In Western Australia, an extreme marine heatwave over, the 2010/2011 summer, in combination with southward range, extension of subtropical herbivorous ﬁshes associated with ocean, kelp forest losses have been mostly attributed to urbanization, and increased runoﬀ of sediments and nutrients (, have been largely replaced by less complex and less productive, the western and northern coastlines near the metropolitan areas, urchins is the primary cause of kelp destruction, but subsequent, proliferation of turf algae, in part due to high nutrient levels, also, acts to inhibit kelp recruitment and recovery (, Destructive grazing by urchins is also a signiﬁcant driver of, This urchin, previously only abundant along the New South, Wales coast, has undergone southern range extension over the, last several decades due to increasing poleward penetration, EAC are responsible for the incursion of the urchin into, southern waters, their local proliferation is linked to ecological, overﬁshing of large southern rock lobster (, overgrazing by urchins has mostly aﬀected, loss of these iconic underwater forests (, attributed to the increasing inﬂuence of the warm, nutrient-poor. Knowledge of the capacity, for hysteresis is critical since it can prove one of the biggest, challenges to kelp forest restoration (see, successful restoration to occur at scale, eﬀorts to overcome, hysteresis and/or provide a novel source of propagules must, also be scalable, and ideally commensurate with the scale of the, Overall, ensuring natural recruitment of juvenile kelp and, the continuation of self-sustaining generations is critical, to long-term restoration success. doi: 10.1007/s00442-009-1555-y, Buschmann, A. H., Camus, C., Infante, J., Neori, A., Israel, A., Hernández-González, M. C., et al. Kelp forests are also a feature of the west coast of North and South America, the north west Pacific including Korea, New Zealand, South Africa, and many of the islands in the Southern Ocean. Unfortunately, kelp forests in many locations around Australia and in other parts of the world are experiencing habitat loss due to climate change, overgrazing from herbivores, coastal development and pollution. Populations became dominated by single haplotypes that were often not dominant or present prior to the heatwave. Journal of Experimental Marine Biology and Ecology 295, 63–90. However, in some instances reference ecosystems, may not be identiﬁable or available, for example, when, there are shifting baselines and poor understanding of. Interactions among subtidal Australian sea urchins, gastropods, and algae: effects of experimental removals. Marine and Freshwater Research 67, 47–56. The cause and scale of degradation is fundamental in determining if kelp can be restored and the methods required to promote reestablishment. For this reason, we launched a citizen science project within the www.seawatchers.org platform to discover the barrens worldwide. (2010). The Marine Benthic Flora of Southern Australia Part II. This relatively small-scale intervention has translated into a large-scale impact/benefit, with crayweed populations continuing to expand and colonize substantial areas, and beginning to function as natural forests (Marzinelli et al., 2016). (2007). With a focus on Australian. Resilience and stability of kelp forests: The importance of patch. Restoring Tasmania’s giant kelp forests the focus of new research project. These novel data provide important first estimates that help to contextualize the importance of macroalgal-sedimentary connectivity for deep coastal food webs, and measured fluxes help constrain its role within global blue carbon that can support policy development. Yet, due to a combination of acute and chronic stressors, kelp forests are under threat and have declined in many locations worldwide. This poses major challenges to traditional conservation and environmental management approaches, which typically focus on maintaining or returning species to particular locations. IPCC (2014). This is already causing profound shifts in dominant foundation species and associated ecological communities as canopy seaweeds such as kelp are replaced by tropical species. Canberra: Australian Government Department of the Environment and Energy. Here, we highlight how practitioners can use positive density dependence within and amongst kelp species to increase the chances of restoration success. Marine Community Ecology and Conservation, 58, 645–663. doi: 10.1139/f76-129, Perkol-Finkel, S., Ferrario, F., Nicotera, V., and Airoldi, L. (2012). Such indicators for kelp forest restoration, might include transplant survival, growth rates, and condition, (e.g., fouling, bleaching, and photosynthetic eﬃciency), genetic, diversity, and recruitment. A., and Blackshaw, J. K. (2011). The likelihood of propagule survival — and so restoration success — depends on species- and context-specific knowledge to guide choices about appropriate methods to use. Journal of Phycology 55, 745–751. Annual Report of the Status of Condition C: Kelp Reef Mitigation. from remaining healthy individuals (see IMAS 2019). Active restoration eﬀorts typically occur at, small to medium scales, and not the seascape scale at which, kelp forest loss can occur. “Resurvey of the longspined sea, urchin (Centrostephanus rodgersii) and associated barren reef in T, Løvås, S. M., and Tørum, A. Nature Communications 10, 3998. doi: 10.1038/s41467-019-11693-w, Martínez, B., Radford, B., Thomsen, M. S., Connell, S. D., Carreño, F., Bradshaw, C. J. Watanuki, A., Aota, T., Otsuka, E., Kawai, T., Iwahashi, Y., Kuwahara, H., et al. We also believe that monitoring already existing deserts is essential to prevent and predict the creation of new barrens along the coastline and will help us evaluate the possibilities of recovering lost underwater forests. These include indirect effects on fisheries (e.g. Huisman, J. M. (2000). (2001). The, dominant species around low-tide level on, exposed coastlines. Recovering subtidal forests in human-dominated landscapes. Phase-shift dynamics of sea urchin overgrazing on nutrified reefs. Does restoration of a habitat-forming seaweed restore. Ecological Applications 8, 309–322. This tool provides a consistent set of criteria against which key ecosystem attributes can be assessed, and acts as a conceptual framework for restoration practitioners, managers, and regulators. And while this won't slow down the effects of climate change, it does mean the areas will be actively protected. (2019). or maintenance, which is a rare result in marine restoration. Some authors (e.g., functional deﬁnition that includes other large, brown habitat-forming macroalgae, such as those from the Order Fucales. PLoS ONE 9:e84106. In Western Australia kelp forests were wiped out during an extreme marine heatwave , which was probably a … Connecting Australia's Marine and Coastal Restoration Practitioners. (2017). Active restoration efforts typically occur at small to medium scales, and not the seascape scale at which kelp forest loss can occur. Restoring subtidal marine macrophytes in. biogenic structure restored, and ongoing deterioration prevented, but limited recovery of ecosystem attributes) through to 5 (e.g. We propose a workﬂow and decision system for kelp forest restoration, that identiﬁes alternative pathways for implementation and acknowledges that under, some circumstances restoration at scale is not possible or feasible. Bustamente, R. H., Branch, G. M., and Eekhout, S. (1995). Moreover, species composition of some associated organisms in restored crayweed forests is approaching that of natural forests (Marzinelli et al., 2016) warranting a rating of 4 for “habitat and interactions,” Additionally, ongoing monitoring illustrates that the structural diversity of restored crayweed populations are approaching natural levels (Marzinelli et al., 2016; Steinberg et al., 2016), warranting ratings of 3–4. To test the relationship between genetic diversity and resilience to warming in a coastal foundation species, we planted eelgrass (Zostera marina) pots at two levels of genotypic richness (1 genotype monocultures or 4 genotype mixtures) and exposed these pots to warming events of different frequencies (sustained or alternating) in mesocosms for four months (mid-summer to late fall). Limnology and Oceanography 43, 669–678. (2008). Marine and Freshwater Research 51, 255–263. Large-scale geographic variation in distribution and. Abiotic measurements within the patches indicated that kelp were less able to engineer the sub-canopy environment in smaller patches. In 2007, kelp forests were also discovered in tropical waters near Ecuador.. Physically formed by brown macroalgae, kelp forests provide a unique habitat for marine organisms and are a source for understanding many ecological processes. At the beginning of the experiment, patch formation resulted in short-term increases in E. radiata recruitment in patches <1 m2. could be weighted to provide a more subtle assessment. Frontiers in Ecology and the Environment 5:153–160. Wernberg, T., Coleman, M. A., Babcock, R. C., Bell, S. Y., Bolton, J. J., Connell, S. D., et al. Layton et al. Recently revised into two, abundant kelp in Australia, with a distribution, that mirrors the extent of the GSR. About this fact sheet The Giant Kelp Marine Forests of South East Australia ecological community has been progressively lost, especially on the east coast of Tasmania, due to changing oceanographic conditions and corresponding changes in threatening processes caused by climate change. SER have developed International Standards for the practice of ecological restoration, central to which is the “5-star recovery system” (see McDonald et al., 2016). Oakland, California: University of California Press. This gap presents a potential shortcoming for the field as evidence from other marine ecosystems illustrates that the inclusion of positive species interactions can enhance restoration success. Since kelp are foundation species that support diverse ecological communities, comparison of community structure between restored and natural “reference ecosystems” can provide comparative indicators of restoration success at the community-level. Ecology and Evolution 7, 8406–8418. Join ResearchGate to find the people and research you need to help your work. for ecosystem functions and management actions. Future approaches could incorporate knowledge applied from other fields, such as genetics and agriculture, and harness the possibilities provided by technology. “Benefit-cost analysis for marine habitat restoration: a framework for estimating the viability of shellfish reef repair projects,” in Report to the National Environmental Science Programme, Marine Biodiversity Hub, (Perth: The University of Western Australia). 2015, but see Wood et al. Journal of Experimental Marine Biology and Ecology 400, 17–32. Chemical microenvironments within macroalgal assemblages: implications for the inhibition of kelp recruitment by turf algae. - "Substantial blue carbon in overlooked Australian kelp forests" Secondly, is there hysteresis present in the dynamics of the system? Nonetheless, the project realized only marginal success and outcomes varied markedly across the 10 + sites. We reveal that these kelp forests represent 10.3–22.7 Tg C and contribute 1.3–2.8 Tg C year⁻¹ in sequestered production, amounting to more than 30% of total blue carbon stored and sequestered around the Australian continent, and ~ 3% of the total global blue carbon. Reconstructing historical marine. As a result, areas that were once abundant macroalgal forests are being rapidly replaced by underwater deserts – barrens – dominated by overgrazed rocks rather than macroalgae. Kelp forests dominate the rocky coasts of temperate Australia and are the foundation of the Great Southern Reef. We propose that high temperature stress created a tradeoff, such that some genotypes experienced greater photoinhibiton during mid-summer while other genotypes were light limited during the late fall. Whilst the physical conditions that likely precipitated the initial decline (i.e. Within Australia there have been few attempts to restore kelp forests. With kelp forests dominating 25% of the world’s coastline and providing valuable ecosystem services that support coastal communities, such as providing food and habit to a diverse range of productive marine species, kelp provide approximately $10B a year to the Australian economy. In these areas, and in many locations globally, drivers of kelp forest decline include both physical and biological factors (also see Krumhansl et al., 2016), and these must be understood for restoration efforts to be effective. PNAS 113, 13785–13790. Marine Environmental Research 131, 243–257. taxonomic diversity: a new and impoverished reef state. Mitigating the effects of a coastal power plant on a kelp forest community: rational and requirements for an artificial reef. This may lead to post-disturbance populations that consist only of adult kelp which could perish after 1 generation. “Restoration of string kelp (Macrocystis pyrifera) habitats on Tasmania’s east and south coasts,” in Final Report to Natural Heritage Trust for Seacare, (Tasmania). This figure includes materials, transport and personnel, but excludes project management and monitoring, and also excludes the initial and ongoing scientific research done to develop and optimise the restoration methods, Underwater macroalgal forests are among the most important ecosystems in our oceans. 1996), they might represent opportune circumstances for human intervention and ecological restoration (Johnson et al. Seaweed offsetting is not the sole solution to climate change, but it provides an invaluable new tool for a more sustainable future. Has air-ﬁlled ﬂoats and, typically ﬂoats just above the substrata. doi: 10.4319/lo.1998.43.4.0669. transplanting ∼100 juvenile kelp and 3 fertile sporophylls), but it did have the most similar community composition to the donor site and was the most exposed and southerly location of the restoration sites. Macreadie, P. I, Anton, A., Raven, J. Critically, assisted recovery approaches are often hindered by resource constraints and by hysteresis and feedbacks in the ecological dynamic (see Scheffer et al., 2001; Marzloff et al., 2011), which impair kelp recruitment and reestablishment even after the initial driver of decline has been ameliorated (Gorman and Connell, 2009; Johnson et al., 2017). Overyielding of mixtures during sustained warming was driven by positive complementarity, which appears to be the result of warming-induced shifts in the relative performance of genotypes over time. absence of any commercial or ﬁnancial relationships that could be construed as a, Copyright © 2020 Layton, Coleman, Marzinelli, Steinberg, Swearer, Wernberg and Johnson. Kelp forest habitat restoration has the potential to increase sea urchin gonad biomass 2013 - Ecosphere. Zarco-Perello, S., Wernberg, T., Langlois, T., and Vanderklift, M. A. Figure 4. Advances in restoration ecology: rising to the challenge of. Carnell, P. E., and Keough, M. J. Project management and monitoring of the, multiple Operation Crayweed sites is estimated at an additional. McLeod, I., Schmider, J., Creighton, C., and Gillies, C. (2018). Notably, indirect commercial and social benefits arising from kelp forests are likely to be substantial, especially in coastal communities. Work by Valentine and Johnson (2005) found that even after the removal of urchins, heavy inoculation with E. radiata kelp spores was insufficient to achieve kelp reestablishment – presumably due to recruitment inhibition by the turf algae and sediments that had proliferated in the absence of the kelp (also see Layton et al., 2019b). on subtidal rocky reefs in New South Wales. invasive species and contamination) and “physical conditions” (e.g. (2011). Sargassum bed restoration by. All rights reserved. doi: 10.1007/s10530-015-0845-z, Valentine, J. F., and Johnson, C. R. (2003). Estimating the size and impact of the ecological restoration economy. Assisted, recovery – where natural kelp recovery is facilitated by either. Ecological Management & Restoration 19, 98–101. In kelp forests dominated by a single foundation species (e.g., Ecklonia radiata in Australia), genetic diversity may be a more appropriate consideration for creating diverse and stable-functioning ecosystems and can be promoted by sourcing propagules for a restoration site from multiple locations (see Miller et al. Conservation challenges in urban seascapes: promoting the growth of threatened species on coastal infrastructures. Consequently, in 2012 the giant kelp forests of southeast Australia became the first marine community listed as endangered under the Australian Federal Government Environment Protection and Biodiversity Conservation Act (Evans et al., 2017). Harnessing synthetic biology for kelp, Coleman, M. A., Kelaher, B. P., Steinberg, P. D., and Millar. Johnson, C. R., Banks, S. C., Barrett, N. S., Cazassus, F., Dunstan, P. K., Edgar, G. J., et al. Has a short rigid “stipe” (i.e., stem) that holds, is likely to have exacerbated the problem (also see, canopy-forming giant kelp forests (which also occur to a, lesser extent in parts of Victoria and South Australia) have, been lost over recent decades, to be replaced by, of southeast Australia became the ﬁrst marine community, listed as endangered under the Australian Federal Government, Environment Protection and Biodiversity Conservation Act, barren formation across its historical range in New South, reef habitats along the central and southern coastlines of. Heatwaves are an increasing threat to organisms across the globe. doi: 10.1016/j.dsr2.2010.10.003, Trial of an industry implemented, spatially discrete eradica, Journal of Experimental Marine Biology and Ecology, 353, 169–172. Building coral reef resilience through assisted evolution. For Operation Crayweed, workers initially transplanted six, securing of mesh mats for crayweed attachment, collection of, adult crayweed from the donor population, and the transplanting, itself. Development and preliminary-testing of this, workﬂow utilized examples of kelp loss from T, local restoration interventions must consider two species of. Large patches with dense kelp supported the highest abundance, species richness, and diversity of fishes, with the addition of dense kelp tripling biomass and doubling richness. Restoration of kelp beds on an urchin barren: Removal of sea urchins. doi: 10.1007/s12237-019-00525-1. Marzinelli, E. M., Campbell, A. H., Vergés, A., Coleman, M. A., Kelaher, B. P., and Steinberg, P. D. (2014). Løvås, S. M., and Tørum, A. Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, T, dominate rocky coastal environments in temperate and, ) – the eﬀects of which can reach to adjacent, ). The loss of these iconic underwater forests (Figure 2) is mostly attributed to the increasing influence of the warm, nutrient-poor waters of the EAC in Tasmania, although urchin overgrazing is likely to have exacerbated the problem (also see Ling, 2008; Ling and Keane, 2018) and be impeding recovery in some areas. Throughout much of its range, it is the only laminarian kelp and hence plays a key role in facilitating biodiversity and driving food webs, and it underpins immense ecological and socioeconomic values. Distribution models predict large contractions of habitat-forming seaweeds in response to ocean warming. All we need is information on the position of the barren (its GPS coordinates), the depth at which you saw it, and a photograph. doi: 10.1111/1365-2435.13310. Moreover, species composition of some, associated organisms in restored crayweed forests is approaching. CL prepared the manuscript with input from all other authors. (2016). Tropicalisation of temperate reefs: implications. Much like terrestrial forests, these marine forests create, complex habitat for diverse communities of ﬂora and fauna. www.seawatchers.org for more information. A., Gillies, C., Hancock, B., McLeod, I., Nedosyko, A., Reeves, S., et al. of adequate data (e.g., many Australian shellﬁsh reefs, not be sensible targets for restoration when current/predicted, environmental parameters (e.g., water temperature) are diﬀerent, These diverse circumstances are acknowledged by the, Society for Ecological Restoration (SER) who recognize that, a reference ecosystem may instead be a conceptual model, synthesized from numerous locations, indicators, and historical, developed International Standards for the practice of ecological, restoration, central to which is the “5-star recovery system”, set of criteria against which key ecosystem attributes can be, assessed, and acts as a conceptual framework for restoration, practitioners, managers, and regulators. Photos reproduced with permission of Matthew Ramaley (left) and Matthew Doggett (right). transplantation of germlings grown under protective mesh cage. The purpose of the kelp forest restoration project is to convert these desolate monoculture sea urchin barrens into diverse and resilient ecosystems. This likely occurred because transplanted individuals reproduced synchronously and rapidly post‐transplantation, prior to mortality of adult donor transplants. Anticipating changes to future connectivity within a network of marine protected areas. temperatures, overgrazing, and pollution. Much like terrestrial forests, kelp forests are complex habitats that support entire communities of associated flora and fauna. seagrass). doi: 10.4319/lo.2007.52.5.1838, Gorman, D., and Connell, S. D. (2009). sand dune erosion and water particle velocity. Kelp forest habitat restoration through targeted sea urchin removals can potentially result in nine times more S. franciscanus gonad biomass available to the local commercial fishery (i.e., only including urchin over the legal minimum size limit) per unit area of urchin barren restored to kelp forest, with more modest increases also expected in terms of reproductive potential. the Anthropocene: trajectories and future-prooﬁng. News, ResearchJuly 06, 2020Media Contact— Katherine Leitzell / email@example.com / (858) 246-1661 Healthy Coastal and Marine Ecosystems California Sea Grant is pleased to announce six new research projects aimed at restoring California’s kelp forests.Led by some of the state's top marine scientists, the newly funded projects will address key questions for kelp forest restoration and… Meanwhile, back in Tasmania, Layton continues to watch over his nurseries of infant kelp, and he urges us to be cognizant of what kelp forests are already doing for us right now. (2019). necessary to underpin decisions such as choice of donor site, size of patch, etc. Much like terrestrial forests, these marine forests create complex habitat for diverse communities of flora and fauna. Coleman, M. A., Cetina-Heredia, P., Roughan, M., Feng, M., Van Sebille, E., and Kelaher, B. P. (2017). In some places its mighty giant kelp forests have all but disappeared – but scientists are attempting to fight back with ‘super kelp’. Pert, C. G., Swearer, S. E., Dworjanyn, S. A., Kriegisch, N., Turchini, G. M., Francis, D. S., et al. Strikingly, these impacts were cryptic and not reflected in measures of forest cover used to determine ecological impact of the heatwave.