Detached Seaweeds as Important Dispersal Agents Across the Southern Ocean

Macaya, Erasmo C.; Tala, Fadia; Hinojosa, Iván A.; Rothäusler, Eva

doi:10.1007/978-3-030-39448-6_4

Cited by 5 publications

(4 citation statements)

References 96 publications

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“…on coastal hydrodynamic and larger-scale oceanographic processes, but in some cases macroalgal detritus has been recorded hundreds or even thousands of km from source populations (Nikula et al 2010;Fraser et al 2018;Kokubu et al 2019;Macaya et al 2020). The potential for longdistance transport will also depend on characteristics of the detritus itself, particularly particle size and density, buoyancy, and longevity (Hyndes et al 2014;Wernberg and Filbee-Dexter 2018;Tala et al 2019).…”

Section: Discussionmentioning

confidence: 99%

“…5) and, while some may be consumed by local detritivores (Krumhansl and Scheibling 2012), it is likely that a substantial amount is transported to other coastal habitats including sandy beaches (Orr et al 2014) and seagrass meadows (Wernberg et al 2006), while some may be transported to offshore sedimentary habitats (Britton‐Simmons et al 2012; Queirós et al 2019) or deep‐water canyons or fjords (Vetter and Dayton 1998; Filbee‐Dexter et al 2018). The distance and direction of transport will be largely dependent on coastal hydrodynamic and larger‐scale oceanographic processes, but in some cases macroalgal detritus has been recorded hundreds or even thousands of km from source populations (Nikula et al 2010; Fraser et al 2018; Kokubu et al 2019; Macaya et al 2020). The potential for long‐distance transport will also depend on characteristics of the detritus itself, particularly particle size and density, buoyancy, and longevity (Hyndes et al 2014; Wernberg and Filbee‐Dexter 2018; Tala et al 2019).…”

Section: Discussionmentioning

confidence: 99%

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Examining the production, export, and immediate fate of kelp detritus on open‐coast subtidal reefs in the Northeast Atlantic

Smale

Pessarrodona

King

et al. 2021

Limnology & Oceanography

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Kelp forests are highly productive coastal habitats and are emerging as important sources of organic matter for other ecosystems. Although their high rates of productivity and detritus release are expected to lead to substantial export of carbon, few studies have actually quantified rates of export or the persistence of detritus. We addressed this in eight subtidal kelp forests (Laminaria hyperborea) spanning the length (9 of latitude) of the United Kingdom. Specifically, we quantified detritus production, retention/export from source and adjacent habitats, and in situ decomposition rates. Detritus released via both dislodgment of whole plants and "May cast" shedding of old growth was highly variable between sites with greatest values recorded in our colder, northern sites. This was attributable to greater plant size biomass in northern regions, rather than plant density or dislodgement rates. On average, the annual production of kelp detritus was 4706 AE 700 g FW m À2 yr À1 or 301 g C m À2 yr À1 . Low retention of detritus within the kelp forest and adjacent sedimentary habitats indicated very high rates of export (> 98% across the study). A litterbag experiment showed detritus may take > 4 months to decompose, suggesting great potential for long distance transport. Overall, our findings suggest that L. hyperborea forests export large amounts of detritus subsidies across their range, which can potentially shape the structure of distant benthic communities and constitute a relevant and largely overlooked flux in the coastal carbon cycle, which may represent an important component of natural carbon sequestration.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Examining the production, export, and immediate fate of kelp detritus on open‐coast subtidal reefs in the Northeast Atlantic

Smale

Pessarrodona

King

et al. 2021

Limnology & Oceanography

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“…Drift or stranded macroalgae play a key part in these food chains. To date, 39 species of macroalgae have been recorded drifting, stranding or floating in Antarctica, including some crossing the APF (Macaya et al 2020). The ecological isolation of Antarctica is predicted to be strongly influenced by changes in the frequency and intensity of storms, with an increasing number of incursions crossing the APF predicted (Fraser et al 2018), Fraser et al (2020 evaluated the biogeographical processes influencing the floras of the Antarctic and sub-Antarctic, focusing on the role of buoyant macroalgal rafts and their contributions to species dispersal.…”

Section: Discussionmentioning

confidence: 99%

Marine macroalgae of the Balleny Islands and Ross Sea

et al. 2022

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The macroalgae of the Balleny Islands (66°15′S–67°35′S and 162°30′E–165°00′E) have been infrequently collected and the flora remains poorly known. This chain of islands is located on the edge of the Antarctic Circle in the northern Ross Sea, ~250 km north of the coast of northern Victoria Land, and it represents the most northerly land in the Ross Sea region. As well as being very remote, access to these islands is difficult given the highly variable prevailing ice conditions. We summarize the macroalgal floras of the Balleny Islands and the Ross Sea, including reporting new records, extending the known distribution of other taxa and highlighting the need for further taxonomic research on some of the most common and widespread species. Many of the taxa reported have been collected on few occasions and, as a consequence, there is insufficient material available, including reproductively mature samples, for some species to be fully documented. While these collections are providing intriguing insights into the relationships between the macroalgae found around the Antarctic continent, the full biodiversity of the Balleny Islands remains to be investigated, and further collections are required to enable detailed comparisons with other parts of the Antarctic region.

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“…In other phylogeographic studies in non-buoyant macroalgae species, evidence of recent colonization explained by exceptional events of rafting and current reproduction and recruitment occurring on a very small scale (Guillemin et al 2020 ) has been reported. In addition, recent studies have reported a relaxation of the ACC which has been observed through kelp rafting ( Durvillaea antarctica and Macrocystis pyrifera), suggesting that the ACC could act as a dispersion agent for marine organisms, specifically, for species that at present are non-native in the Antarctic (Avila et al 2020 ; Macaya et al 2020 ).…”

Section: Discussionmentioning

confidence: 99%

Divergence time and species delimitation of microbivalves in the Southern Ocean: the case of Kidderia species

2021

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The systematics of Subantarctic and Antarctic near-shore marine benthic invertebrates requires major revision and highlights the necessity to incorporate additional sources of information in the specimen identification chart in the Southern Ocean (SO). In this study, we aim to improve our understanding of the biodiversity of Kidderia (Dall 1876 ) through molecular and morphological comparisons of Antarctic and Subantarctic taxa. The microbivalves of the genus Kidderia are small brooding organisms that inhabit intertidal and shallow subtidal rocky ecosystems. This genus represents an interesting model to test the vicariance and dispersal hypothesis in the biogeography of the SO. However, the description of Kidderia species relies on a few morphological characters and biogeographic records that raise questions about the true diversity in the group. Here we will define the specimens collected with genetic tools, delimiting their respective boundaries across provinces of the SO, validating the presence of two species of Kidderia . Through the revision of taxonomic issues and species delimitation, it was possible to report that the Antarctic species is Kidderia subquadrata and the species recorded in the Subantarctic islands Diego Ramirez, South Georgia and the Kerguelen Archipelago is Kidderia minuta . The divergence time estimation suggests the origin and diversification of Kidderia lineages are related to historical vicariant processes probably associated with the separation of the continental landmasses close to the late Eocene. Supplementary Information The online version contains supplementary material available at 10.1007/s00300-021-02885-6.

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Detached Seaweeds as Important Dispersal Agents Across the Southern Ocean

Cited by 5 publications

References 96 publications

Examining the production, export, and immediate fate of kelp detritus on open‐coast subtidal reefs in the Northeast Atlantic

Examining the production, export, and immediate fate of kelp detritus on open‐coast subtidal reefs in the Northeast Atlantic

Marine macroalgae of the Balleny Islands and Ross Sea

Divergence time and species delimitation of microbivalves in the Southern Ocean: the case of Kidderia species

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