Introduction
Biogenic reefs are secondary marine substrates, also referred to as bioconstructions or bioherms, made by autogenic ecosystem engineers (sensu, Jones et al., ) that provide habitats for various species. Their ecological role goes far beyond simple physical effects because they can modulate many resources and interactions between species inhabiting the reefs. Marine bioconstructions involve a variety of fragile three-dimensional habitats, from shallow water coral reefs to mesophotic coralligenous concretions, hosting rich, and diverse benthic assemblages (Cocito, ; Ingrosso et al., ; Cerrano et al., ). Biogenic reefs can be found from the intertidal to the deep sea; some are ephemeral and last a few years, while others remain active for millennia. The main framework builders are able to form bioconstructions at different latitudes, from tropical to polar zones, and include films of cyanobacteria and diatoms, calcareous rhodophytes, sponges, hermatypic symbiotic and aposymbiotic corals, polychaetes as serpulids and sabellariids, mollusks like vermetids, oysters and mussels, and bryozoans.
Biogenic reefs have an inestimable value for the biodiversity they host and the countless ecosystem goods and services they provide, which are only partially quantifiable in their economical values. Considering the time required for their formation, their destruction can often be considered almost irreversible, so bioconstructions require the utmost attention in any conservation measure. Indeed, both tropical and temperate biogenic reefs are increasingly threatened by multiple stressors resulting in the decline of reef communities worldwide (e.g., Harborne et al., ; Ellis et al., ; Maher et al., ; Bevilacqua et al., ). Natural and anthropogenic stressors include decline in water quality, overexploitation of resources, habitat destruction, and global climate change among others, which have all been linked in tropical and temperate areas with the occurrence of mass coral bleaching and a variety of diseases and mass mortality events (e.g., Carpenter et al., ; Garrabou et al., ; Ban et al., ; Burge et al., ; Thompson et al., ; Ponti et al., ; Gómez-Gras et al., ).
Many environmental stressors and anthropogenic disturbances are thought to favor the onset of infectious disease, either on their own or more commonly synergistically (Harvell et al., ). For example, anomalously high sea surface temperatures and their increasing frequency have been shown to raise coral susceptibility and pathogen virulence, influencing the severity, and rate of spread of infections (Randall et al., ; Wooldridge, ). Furthermore, disease susceptibility and the increase of corallivores has also been linked to stressing conditions as high sedimentation rates, water turbidity, eutrophication, and the development of diving tourism (e.g., Fabricius, ; Lamb et al., ; Pollock et al., ; Nicolet et al., ).
Nowadays, many studies focus on possible ecological effects of global climate change, which has resulted in massive worldwide coral bleaching in the tropics (e.g., Baker et al., ; Hughes et al., ), and in massive mortality events in the Mediterranean Sea (Ponti et al., ; Turicchia et al., ; Garrabou et al., ; Gómez-Gras et al., ). Although it is not easy to categorize and disentangle the synergic effects of different threats, a simple literature review based on identified keywords related to the major threats highlighted how studies have mainly focused on climate change related issues and secondarily on pollution (Figure 1). Apparently, we are losing sight of the impacts on biogenic reefs associated with more “localized” disturbances, such as decline in water quality, overexploitation of resources, destructive fisheries, spread of non-indigenous species, recreational activities, and urbanization. Such stressors are increasing in intensity and frequency on a global scale and will therefore undoubtedly be playing a pivotal role in the health and functionality of biogenic reefs, especially about disease outbreaks, resilience to ecological shifts, and loss of ecological goods and services. This Frontiers Research Topic (RT) entitled “Biogenic Reefs at Risk: Facing Globally Widespread Local Threats and their Interaction with Climate Change,” aims to fill the gaps by collecting new insights on worldwide biogenic reefs threats, advancing in monitoring technologies, and providing innovative perspectives on conservation and restorations strategies.
Figure 1
Emerging Issues
Among the most relevant emerging issues that are not directly linked to climate change but are threatening biogenic reefs worldwide, there are newly discovered diseases, like the stony coral tissue loss disease which outbreaks are spreading fast in the Caribbean (Estrada-Saldívar et al., ; Heres et al., ; Meiling et al., ). Since we know very little about the origin of pathogens in corals, there is also a need for a better understanding of the etiology, the evolution, and biogeography of coral diseases (Montano et al., ).
Possible ecological cascading effects on biogenic reefs due to the spread of non-indigenous species are poorly known, among them those related to the invasion of lionfishes in the Caribbean (Pterois volitans; McCard et al., ) and the Mediterranean Sea (Pterois miles; Poursanidis et al., ), the rapid spread of invasive sun corals (Tubastraea spp.) in the (sub)tropical Atlantic because of shipping (Creed et al., ), and the increasing occurrence of various species of coral killing sponges in the Indo-Pacific ocean (e.g., Turicchia et al., ; Fromont et al., ; Ashok et al., ), as well as the spreading of invasive macroalgae in Mediterranean temperate biogenic reefs (Kersting et al., ). A contribution to the understanding of trophic cascade effects in the conservation of temperate biogenic reefs was provided by the article published in this RT by Christie et al., whose experiments indicate that mesopredators such as the green crab (Carcinus maenas) and the goldsinny wrasse (Ctenolabrus rupestris) may be co-responsible for the decrease in blue mussel (Mytilus edulis) beds in northern Europe.
The pollution issues are very pronounced, especially in Southeast Asia (e.g., Heery et al., ; Adyasari et al., ; Reichert et al., ), and should not be underestimated also in other regions, especially concerning plastics and emerging pollutants in general, as highlighted in this RT by Angiolillo and Fortibuoni. Likewise, the negative impact of fishing activities is still underestimated in many regions, including developed countries, and especially regarding the deep biogenic reefs. Two manuscripts in this RT stressed the urgency to fill the knowledge gap on the current and predicted distribution, according to climate change scenarios, of the deep bioconstructions to protect them from fishing threats and maintain a pocket of pristine-like biodiversity (Dias et al.; Fragkopoulou et al.). Moreover, there is an increasing impact of land reclamation triggering devastating local dredging activities (e.g., Topçu et al., ; Pancrazi et al., ). In addition to the direct habitat removal, one of the main effects of land reclamation and coastal development, is the increase in water turbidity that can undermine the resilience of surrounding biogenic reefs, especially those with a strong dependence on light, as in the study carried out on Singapore' coral reefs and presented in this RT by Morgan et al.
Another threat to biogenic reefs that has received much attention is that of massive outbreaks of corallivores. Well-known examples are outbreaks of crown-of-thorns starfish (Acanthaster spp.) and gastropod snails of the genus Drupella, which may cause serious coral mortality (Turner, ; Pratchett et al., ). Whether there is a direct relation with climate change is not clear, but it is striking that such outbreaks can occur directly after massive coral bleaching event and may affect coral populations that have survived the bleaching (e.g., Hoeksema et al., ; Saponari et al., ).
Conservation Measures and Future Perspectives
Information on many local, but globally spread, threats to biogenic reefs is still limited. Therefore, it is urgent to draw the most complete picture on these impacts including the multiple stressors acting in synergy with climate change effects. In this RT, Ford et al. and Montefalcone et al., although working in different geographical areas and with different approaches, similarly concluded that local human impacts can deeply alter the resilience of tropical coral reefs toward repeated climate change related disturbance events, jeopardizing the future of these ecosystems. To this end, field and manipulative experiments simulating effects of ecological shifts due to both pulse and press disturbances affecting biogenic reefs and modeling approaches that can provide insights into future trends should be strongly encouraged.
A widespread and standardized approach to analyzing the health of biogenic reefs in relation to local disturbances could help mitigate their effects and improve solutions. However, since climate change acts on a global scale, and many anthropogenic disturbances, although local, have a global spread, the conservation and restoration of our planet's biogenic reefs must be addressed with at least international approaches and policies (e.g., the European Green Deal and the European Biodiversity Strategy, the Coral Triangle Initiative). In this perspective, individual Marine Protected Areas can do little for the conservation of these habitats if they do not act synergistically as functional wide-area networks (Giakoumi et al., ). In this respect, Gazulla et al. contributed to the RT by providing a case study on the conservation and restoration of the red coral Corallium rubrum populations based on the connectivity network obtained by a demo-genetic approach. Similarly, citizen science initiatives are proving able to provide effective community-based monitoring at the regional or global level supplementing institutional actions (Sully et al., ; Turicchia et al., ).
Coastal development and coastal defense around the world are undergoing to a profound paradigm shift, passing from large concrete structures to nature-based solutions, including the application of new eco-friendly materials and shapes (Airoldi et al., ; Sella et al., ) that can favor the settlement of local species and, over time, the restoration of coastal biogenic reefs, such as coral reef and oyster beds. A better understanding of the effectiveness of such manmade structures would require more long-term research comparing the development of their communities with that of adjacent biogenic reefs (Perkol-Finkel et al., ; Hill et al., ; Monchanin et al., ).
Finally, from a technological perspective, three papers published within this RT highlighted that new measuring and monitoring tools, based both on underwater (Dellisanti et al.; Rossi et al.) and aerial platforms (Bajjouk et al.), can be developed, especially for the mapping and conservation of relatively shallow waters biogenic reefs.
The widespread and continuous alteration of biogenic reef ecosystems is affecting mainly ecosystem engineers, rapidly fragmenting their complex, and delicate trophic web, weakening the whole bioconstructions' architecture. This increasing fragility open the door to pathogens and non-indigenous species deeply compromising natural recovery and restoration strategies (Ponti et al., ; Verdura et al., ). Without an effective and rapid reduction of anthropogenic pressures on temperate and tropical bioconstructions we will not have any possibility to reverse the present rate of biodiversity loss.
Overall, the topic addressed here is very broad, embracing very different fragile marine ecosystems from tropical to temperate seas and the relationship humans have with their conservation and restoration. The diversity of the contributions collected in this RT focusing on different stressors and using different approaches and technologies to study biogenic reefs around the world reflects this complexity well. They provide new insights not only on the cumulative and synergic effects of multiple threats and their interaction with climate change in different systems but also stress on needs and gaps to advance in biogenic reefs monitoring, conservation, and restoration. These papers are aimed at a very wide audience, from scientists to managers and policymakers, as well as stakeholders involved in biogenic reefs goods and services. We believe they will support future advances to improve understanding of biogenic reefs conservation ecology, ultimately leading to a healthier ocean. We thank all contributing authors and are confident that readers will enjoy reading these papers on threats to biogenic reefs.
Publisher's Note
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Author contributions
All authors contributed to writing and editing this editorial. Figure 1 was prepared by MP. All authors contributed to the article and approved the submitted version.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Summary
Keywords
bioconstruction, biodiversity, human impact, disturbance, ecological shift, marine conservation, resilience, citizen science
Citation
Ponti M, Linares C, Cerrano C, Rodolfo-Metalpa R and Hoeksema BW (2021) Editorial: Biogenic Reefs at Risk: Facing Globally Widespread Local Threats and Their Interaction With Climate Change. Front. Mar. Sci. 8:793038. doi: 10.3389/fmars.2021.793038
Received
11 October 2021
Accepted
23 October 2021
Published
16 November 2021
Volume
8 - 2021
Edited and reviewed by
Angel Borja, Technological Center Expert in Marine and Food Innovation (AZTI), Spain
Updates
Copyright
© 2021 Ponti, Linares, Cerrano, Rodolfo-Metalpa and Hoeksema.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Massimo Ponti massimo.ponti@unibo.it
†ORCID: Massimo Ponti orcid.org/0000-0002-6521-1330
Cristina Linares orcid.org/0000-0003-3855-2743
Carlo Cerrano orcid.org/0000-0001-9580-5546
Riccardo Rodolfo-Metalpa orcid.org/0000-0001-7054-1361
Bert W. Hoeksema orcid.org/0000-0001-8259-3783
This article was submitted to Marine Ecosystem Ecology, a section of the journal Frontiers in Marine Science
Disclaimer
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.