Genetic diversity patterns of lionfish in the Southwestern Atlantic Ocean reveal a rapidly expanding stepping-stone bioinvasion process

In 2020, multiple lionfish (Pterois spp.) records along the equatorial Southwestern (SW) Atlantic revealed a new expansion of these potentially damaging invasive populations, which could impact over 3500 km of Brazilian coastline over the next few years, as well as unique ecosystems and marine protected areas in its path. To assess the taxonomic status, invasion route, and correlation with other centres of distribution, we investigated the genetic diversity patterns of lionfish caught in 2022 at the Amazonia, Northeastern Brazil, and Fernando de Noronha and Rocas Atoll ecoregions, using two molecular markers, the mitochondrial COI and the nuclear S7 RP1. The data indicate that all studied lionfish belong to what is generally accepted as P. volitans, and share the same genetic signature as lionfish present in the Caribbean Sea. The shared haplotypes and alleles indicate that the SW Atlantic invasion derives from an active movement of adult individuals from the Caribbean Sea into the Brazilian coast. The Amazon mesophotic reefs likely served as a stepping-stone to overcome the biogeographical barrier represented by the Amazon-Orinoco River plume. New alleles found for S7 RP1 suggest the onset of local genetic diversification, heightening the environmental risks as this bioinvasion heads towards other South Atlantic ecoregions.

A social-ecological engagement with reef passages in New Caledonia: Connectors between coastal and oceanic spaces and species

Healthy and protected coral reefs help island systems in the tropics thrive and survive. Reef passages link the open ocean to lagoon and coastal areas in these ecosystems and are home to an exceptionally diverse and abundant marine life, hosting emblematic species and fish spawning aggregations. Their multiple benefits for the islands and their peoples (e.g., for transport, fishing, socio-cultural aspects) remain yet understudied. Drawing from qualitative interviews with fishers, scuba divers, and surfers along the coast of Grande Terre in New Caledonia, this study highlights the multi-faceted importance of these keystone places. It shows that reef passages are locally deemed 'communication zones' between coastal and oceanic spaces and species, and have significant un(der)explored ecological and socio-cultural roles. Understanding and protecting these ecological and cultural keystone places will strengthen both the reef ecosystems and the people dependent on them.

Commoning the governance: a review of literature and the integration of power

The concept of commoning is continuing to gain scholarly interest, with multiple definitions and interpretations across different research communities. In this article, we define commoning as the actions by groups with shared interests towards creating shared social and relational processes as the basis of governance strategy. Perhaps it can be more simply defined as collective ways of relating and governing. This article addresses two specific gaps in the commoning literature: (1) to bridge disparate strands of literature on commoning by briefly reviewing each and arguing for integration through epistemic pluralism, and (2) to explicitly examine how power is manifest in commoning processes by bringing in a framework on power (i.e., power over, power with, power to, power within) to understand the links between power and commoning governance processes in two case studies. The two cases are tourism governance on Gili Trawangan, Indonesia and aquatic food production systems in Bulacan, Philippines. We preface this analysis with the argument that power is an integral part of the commoning concept, but that it has yet to be analytically integrated to applications of the broader institutional analysis and development framework or within the networks of action situations approach. We argue that by making explicit how an analysis of power can be coupled to a network of action situations analysis in a qualitative way, we are advancing a key feature of the commoning concept, which we introduce as rooted in epistemic and analytical pluralism in the analysis of governance. In the discussion, we expand on how each case study reveals each of the four power dynamics, and how they improve the understanding of commoning as a pluralistic and perhaps bridging analytical concept.

Shored curfews: Constructions of pandemic islandness in contemporary Sri Lanka

This paper explores COVID-19 pandemic biopolitics in Sri Lanka through tropes of "islanding" and segregation by discussing how notions of island isolation, insularity, and geo-spatial boundedness have been transformed from their colonial origins to our post-colonial present, and in the wake of wartime governance. We engage with interlocking notions of the "pandemic island" and the "islanding" of a zoonotic virus with which to broaden relational thinking on local pandemic realities. We argue that the pandemic has tacitly shaped imaginaries of oceanic "islandness" in contemporary times by focusing on five interrelated island(ed) tropes in the humanities and interpretive social sciences against the context of the pandemic. These include the carceral (fortressed) island, the utopic island, the "urban" island, the illicit island, and the mythologised (cursed) island. This paper further contributes toward an understanding of contemporary islands and island imaginaries, an understudied dimension of pandemic-related land-sea sociality.

No short-term effect of sinking microplastics on heterotrophy or sediment clearing in the tropical coral Stylophora pistillata

Investigations of encounters between corals and microplastics have, to date, used particle concentrations that are several orders of magnitude above environmentally relevant levels. Here we investigate whether concentrations closer to values reported in tropical coral reefs affect sediment shedding and heterotrophy in reef-building corals. We show that single-pulse microplastic deposition elicits significantly more coral polyp retraction than comparable amounts of calcareous sediments. When deposited separately from sediments, microplastics remain longer on corals than sediments, through stronger adhesion and longer periods of examination by the coral polyps. Contamination of sediments with microplastics does not retard corals' sediment clearing rates. Rather, sediments speed-up microplastic shedding, possibly affecting its electrostatic behaviour. Heterotrophy rates are three times higher than microplastic ingestion rates when corals encounter microzooplankton (Artemia salina cysts) and microplastics separately. Exposed to cysts-microplastic combinations, corals feed preferentially on cysts regardless of microplastic concentration. Chronic-exposure experiments should test whether our conclusions hold true under environmental conditions typical of inshore marginal coral reefs.

Institutions and institutional changes: aquatic food production in Central Luzon, Philippines

Aquaculture is the most rapidly growing food production sector globally. In certain coastal social-ecological systems, this has resulted in significant changes and sustainability challenges. In particular, coastal environments which used to support only capture fisheries are becoming sites for brackish water aquaculture production; this impacts the sustainability of aquatic food production. Sustainability challenges associated with aquaculture expansion and intensification necessitate a contextually rooted understanding of institutions and institutional changes which can be used as an informed basis for leveraging institutions to achieve desirable sustainability outcomes in the aquatic food sector. This research used a qualitative empirical case study involving in-depth interviews, participant observation, and analysis of institutional documents in the region of Central Luzon, Philippines. It applied the inter-institutional systems concept which considers multiple institutions with distinct but linked purposes and functions in the societal spheres of state, market, and civil society. The study found that aquaculture emerged as an important livelihood because of rice farmers' need to adapt to saltwater intrusion into what were formerly rice farms. It grew into an industry due to developments in the availability and accessibility of inputs such as fingerlings and feeds. This process was also driven by the high demand and high profitability of fish farming at the time. Regulatory institutions have not adequately adapted to protect the environment. Market institutions adapted but the changes mostly benefited consignacions (middlemen) and large-scale players. However, organised groups of collaborating smallholder fishers and fish farmers are helping to address the disadvantages they face.

SUPPLEMENTARY INFORMATION

The online version contains supplementary material available at 10.1007/s10113-021-01853-4.

Scleractinian corals incorporate microplastic particles: identification from a laboratory study

Microplastics have been detected on beaches and in the ocean from surface habitats to the deep-sea. Microplastics can be mistaken for food items by marine organisms, posing a potential risk for bioaccumulation and biomagnification in the food chain. Our understanding of microplastic pollution effects on ecosystem and physiological processes of coral reefs is still limited. This study contributes to the understanding of effects of microplastic pollution on skeletal precipitation of hermatypic corals. In a five month aquarium-based experiment, specimens of four tropical species were temporarily exposed to high concentrations (ca. 0.5 g L^-1) of polyethylene terephthalate (PET) microplastic particles (< 500 μm). The coral specimens all survived this treatment and show skeletal growth. The skeletal material produced during the experiment, however, incorporated plastic particles and plastic fibres in the aragonitic structure. Long-term consequences of such inclusions on skeletal properties such as stability are yet unknown.