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Sponges POLICY BRIEF SponGES POLICY BRIEF ©Fisheries and Oceans Canada Threats and impacts on sponge grounds ponge grounds or aggregations, are habitats formed by large Sdensities of sponges that can be constituted by either a single species or mixed species assemblages. They are known to occur at all depths and throughout the world. Their extension can range from a few hundreds of m2 to hundreds of km2. Deep-sea sponge grounds (below 200 m), due to their life history, physiology and function are threatened by human activities. As habitat providers, the removal or destruction of sponges will change the biodiversity of the sponge grounds, impacting not only sponge populations, but also the overall functioning of these deep-sea ecosystems. Human induced threats With technological developments and the increased demand for natural resources, the exploitation of fish, oil and potential minerals and new chemical substances, has increased in the deep sea. The impacts of these activities can go from direct physical destruction of seafloor habitats through biomass removal, but also through indirect impacts such as the creation of sediment plumes from bottom trawling or mining plumes from deep-sea mining activities. The particle plumes resulting from trawling (and potentially mining activities) depending on their characteristics, can have a clogging effect on the sponges, reducing their filter/ clearance capacity and causing stress (higher oxygen consumption). Also, environmental changes due to climate change may affect sponges. SponGES has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 679849. This document reflects only the author’s view – the Executive Agency for Small and Medium-sized Enterprises is not responsible for any use that may be made of the information it contains. Impacts due to fishing ecological equilibrium of the deep-sea benthic activity ecosystem. However, about 42 percent of sponge Deep-sea sponge grounds are often found in biomass is protected by current fisheries closures areas of elevated fishing activities that are using and the fishers are operating mainly in the a diverse range of bottom-contact gears. These same areas, outside of dense sponge grounds. include bottom otter trawls, bottom longlines, Therefore, the overall magnitude of sponge deep midwater trawls, sink/anchor gillnets, pots, removals by the commercial fleet is limited and traps, and tangle-nets. estimated to vary between 0.5 to 2.1 percent of Sponges are particularly vulnerable to total sponge biomass predicted to occur in the bottom-contact fishing gears through bycatch area. However, projections of trawling tracks but also the damage, dislodgement and crushing suggest that the sponge biomass within closures caused by the gear operation. The gear type is would be wiped out in just one year by the current an important factor that determines the extent of level of fishing activity, if allowed in these dense impacts to benthic communities. In addition, the sponge areas (Pham et al., 2019). severity of the damages largely depends upon the morphology of the species (complexity, size, Management tools, such as fishing closures, flexibility, etc.). are essential to reach conservation goals. Below are a range of examples of fishing impacts. REMOVAL OF DEEP-SEA SPONGES LONGLINE DESIGNS INFLUENCE BY BOTTOM TRAWLING LEVELS OF SPONGE BYCATCH IN THE FLEMISH CAP AREA The selectivity of different longline designs The important fishing grounds at the Grand on deep-sea sponge communities in the Banks of Newfoundland and the Flemish Cap Azores has been studied as regards the levels in the northwest Atlantic have been exploited and morphological characteristics of sponge for centuries. Extensive, dense aggregations of bycatch for three different types of hook-and- sponges are found at large depths in these areas line techniques as well as accidental damages and have been recognized as vulnerable marine (e.g. abrasion and entanglement) of sponges of ecosystems (VMEs) by the Northwest Atlantic different morphological characteristics. Fisheries Organization (NAFO). NAFO has closed several areas to protect these ecosystems from Extensive observer data on bottom fishing. However, portions of the sponge commercial longlining shows that: grounds of the Flemish Cap, remain unprotected. Estimates of sponge removal by the trawling • Deep-sea sponges are occasional bycatch fleet operating in the Flemish Cap area have organisms. been made to shed light on the ecosystem • Larger and more morphologically complex effects. Using distribution modelling techniques, specimens are being caught more frequently it was estimated that about 230 000 tonnes of than smaller individuals with simpler structures sponges exist in the area and that every day, (Figure 1). these sponges filter about 56 000 million litres • Hand lines have little bycatch while the stone- of seawater and consume 63 tonnes of organic stone longline design increases bycatch levels carbon through respiration, thereby affecting the significantly. turnover of several nitrogen compounds. As a • Underwater imagery reveals additional damages to result, their removal would likely affect the delicate sponges, notably through entanglement in lost gear. 2 FIGURE 1 Percentage of sponges belonging to distinct morphological groups caught by two different longline designs LONGLINE STONE-BUOY LONGLINE STONE-STONE Stalked Papillate Globular Branching Pedunculate Tubular Flabellate MORPHOLOGICAL GROUP MORPHOLOGICAL Massive 0 20 40 60 0 20 40 60 PERCENTAGE OF SPONGES (%) Source: Pham et al., forthcoming. Bottom-contact fishing techniques are directly impacting deep-sea sponge communities through bycatch but also incidental damage. The extent of damage is dependent upon the type of fishing gear but also on the morphological characteristics of the sponges inhabiting the fished site. POOR RECOVERY AFTER PHYSICAL years after disturbance by bottom trawling. DISTURBANCE OF AN ARCTIC Results showed that: SPONGE GROUND • Megafaunal densities of both the shallow (~600 m depth) and deep (~1400 m depth) The recovery of two distinct benthic communities benthic communities were significantly lower in on the Schulz Bank in the Arctic Ocean disturbed areas than in control areas (Figure 2). was studied by comparing the diversity and Multivariate analyses revealed a distinct abundance of epibenthic megafauna in disturbed • separation between disturbed and control versus control areas using video imagery, four communities for both sites. FIGURE 2 Total density of organisms found on A. the summit and B. the flank of Schulz Bank. p = 0.00001*** p = 0.0008*** | p = 0.6369 p = 0.0012** p = 0.8853 p = 0.00096*** 40 A B ) -2 0.8 | | 30 | 0.4 | 20 | | DENSITY (INDIVIDUALS M DENSITY (INDIVIDUALS 10 | 0.0 | | | | | | | Ctrl1 Ctrl2 Trawl TREATMENT Ctrl1 Ctrl2 Trawl Averages are noted by diamond shapes, “Ctrl” refers to control transects. Four years after trawling, densities on the trawled areas are significantly different from the control transects. Source: Morrison et al., forthcoming. Deep-sea sponge grounds require much more time than four years to recover from physical disturbance typical of trawling activities. 3 SPONGE GROUND COMMUNITIES Effects of sediment and ARE ALTERED BY TRAWLING ACTIVITY climate change on The influence of trawling activity on sponge sponge species grounds has been studied by comparing the DOES EXPOSURE TO SUSPENDED community composition of the associated fauna, NATURAL SEDIMENT AFFECT density of sponges and their size structure in two SPONGE HEALTH? sites of the Barents Sea with different levels of fishing pressure. Using video footage, the results Individuals of two common North Atlantic deep- revealed: sea sponge species (the glass sponge Vazella pourtalesii, Fig 4a, and the demosponge Geodia pronounced differences in the community • barretti, Fig 4b), were experimentally exposed to composition, diversity, macrofaunal abundance suspended natural sediment at concentrations and size structure of habitat-forming sponge resembling the sediment plumes caused by trawl species between the sites; fisheries. Both species accumulated the sediment dominance by small specimens of the • particles (Fig. 5). structuring species Geodia barretti in the highly V. pourtalesii was able to efficiently evacuate trawled site, and the complete absence of larger sediment particles and tissues appeared cleared individuals; after three weeks of recovery. Exposure to • differences in the community composition sediment did not change oxygen consumption in between sites according to multivariate analysis either species, but pumping activity (measured by (Figure 3). proxy of bacterial clearance) decreased in V. pourtalesii during the second week of exposure (Fig. 6). Our work shows that chronic trawling activities result in a change in the functional diversity of the system. FIGURE 3 Average density (±SE) of different functional groups based on feeding type associated with the Geodia spp. grounds at a highly (high) and lightly (low) trawled site in the Barents Sea (Geodia is not included here) PREDATORS FILTER FEEDERS SUSPENSION FEEDERS DEPOSIT FEEDERS ) -2 0.05 0.3 0.0075 0.04 0.02 0.03 0.2 0.0050 0.02 0.01 0.1 0.0025 0.01 DENSITY (INDIVIDUALS M DENSITY (INDIVIDUALS 0.00 0.0 0.00 0.0000 High Low High Low High Low High Low FISHING PRESSURE Source: Colaço et al., forthcoming 4 FIGURE 4 Examples of the sponge species used for sediment exposure experiments. A. The glass sponge Vazella pourtalesii. B. The demospsonge
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