Corers and Grabs

Narayanaswamy, Bhavani; Bett, Brian J.; Lamont, Peter; Rowden, Ashley A.; Bell, Elanor M.; Menot, Lénaïck

doi:10.1002/9781118332535.ch10

Cited by 9 publications

(12 citation statements)

References 25 publications

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“…The sediment samples for meiofauna and macrofauna (after sieving) were fixed in the 5% formalin solution with Rose Bengal for at least one week. Boxcorer is known to create bow waves (Narayanaswamy et al, 2016), possibly resulting in sediment disturbance, loss of associated fauna (Bett et al, 1994), and underestimating macrofauna abundance (Montagna et al, 2017). Nevertheless, our macrofauna densities were comparable between the samples collected by boxcorer and multicorer (see Table A1 in Liao et al, 2017), suggesting that the gear effects are insignificant.…”

Section: Biological Samplingmentioning

confidence: 63%

Response of the benthic biomass-size structure to a high-energy submarine canyon

et al. 2023

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IntroductionBody size regulates all biological processes, including growth, reproduction, metabolism, trophic interactions, etc., and is the master trait across organisms, populations, and communities. Despite a rich literature on the impacts of human and natural disturbances on body size, a clear knowledge gap is the effect of the submarine canyons on the benthic size structures in the deep sea, hindering our understanding of the ecological processes of these dominant ecosystems on the continental margin.MethodsTherefore, we conducted repeated sediment sampling to compare meiofauna and macrofauna biomass body-size spectrum, growth, metabolism, and size composition from a high-energy submarine canyon, Gaoping Submarine Canyon (GPSC), and the adjacent continental slope off SW Taiwan. The GPSC is a dynamic ecosystem connected to a high sediment-yield small mountain river subjected to strong internal-tide energy, swift bottom currents, frequent mass wasting events, and high terrestrial sediment inputs.ResultsWe found that the meiofauna and macrofauna were characterized by relatively larger individuals dominating on the slope to smaller ones dominating in the canyon. As a result, the community biomass, secondary production, and respiration were depressed with distinctive biomass-size composition in the canyon compared to the non-canyon slope. The environmental factors related to internal tide disturbance (i.e., bottom current velocity, duration of sediment erosion, or low light transmission) substantially influence the body size composition of the canyon benthos, while food supplies (i.e., TOC and C/N ratio) and sediment characters (i.e., grain size and porosity) correlated closely with the slope communities.DiscussionWe concluded that the disturbed condition in the GPSC may have wiped out or depressed the local benthic assemblages, and only the smaller, more resilient species could persist. Our results also highlight that the alterations of the canyon benthic community could be a reference to deep-sea ecosystems under anthropogenic disturbances or global climate change.

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Section: Biological Samplingmentioning

confidence: 63%

Response of the benthic biomass-size structure to a high-energy submarine canyon

et al. 2023

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“…ostracods and copepods. With special requirements for efficient sampling (<300 mm mesh-size nets or multi-corer; see Narayanaswamy et al, 2016), the identification of specimens of meiofaunal harpacticoid copepods often demands the dissection of their smallest appendages (Kihara and Martinez Arbizu, 2012;Rossel and Martıńez Arbizu, 2018). They are studied in a similar workflow using modern imaging tools under an integrative approach for species identification (Easton and Thistle, 2016;Khodami et al, 2020), however, special techniques adapted to their tiny size (i.e.…”

Section: Discussionmentioning

confidence: 99%

“…On soft bottoms, in general, coring devices, including box corer, multi-and megacorer, collect epi-and infaunal species; towed apparatus (trawls, sledges and dredges) is used for the epi-and supra-fauna; as well as baited and sediment traps, for the collections of more mobile and/or pelagic species. Manned submersibles or remotely operated vehicles (ROV) can help in the sample collection by means of push-corer, suction pump, small nets or picking up larger structures on hard substrata (for sampling specificities see Jamieson, 2016;Kaiser and Brenke, 2016;Kelley et al, 2016;Narayanaswamy et al, 2016;Frutos et al, 2017a). In water column studies, pelagic peracarid species are collected by means of mid-water trawls or plankton nets (Kürten et al, 2013;MacIsaac et al, 2014;Papiol et al, 2019); the latter are also suitable as collector of benthic peracarids if they are used as additional sampler attached to trawling devices such as otter or beam trawls (Nouvel and Lagardère, 1976;Lagardère, 1977).…”

Section: Sampling and Sample Processingmentioning

confidence: 99%

Challenges and Advances in the Taxonomy of Deep-Sea Peracarida: From Traditional to Modern Methods

Frutos

Kaiser²,

Pułaski³

et al. 2022

Front. Mar. Sci.

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As one of the oldest branches of biology, taxonomy deals with the identification, classification and naming of living organisms, using a variety of tools to explore traits at the morphological and molecular level. In the deep sea, particular challenges are posed to the taxonomic differentiation of species. Relatively limited sampling effort coupled with apparent high diversity, compared to many other marine environments, means that many species sampled are undescribed, and few specimens are available for each putative species. The resulting scarce knowledge of intraspecific variation makes it difficult to recognize species boundaries and thus to assess the actual diversity and distribution of species. In this review article, we highlight some of these challenges in deep-sea taxonomy using the example of peracarid crustaceans. Specifically, we offer a detailed overview of traditional as well as modern methods that are used in the taxonomic analysis of deep-sea Peracarida. Furthermore, methods are presented that have not yet been used in peracarid taxonomy, but have potential for the analysis of internal and external structures in the future. The focus of this compilation is on morphological methods for the identification, delimitation and description of species, with references to molecular analysis included where relevant, as these methods are an indispensable part of an integrative taxonomic approach. The taxonomic impediment, i.e. the shortage of taxonomists in view of a high undescribed biodiversity, is discussed in the context of the existing large taxonomic knowledge gaps in connection with the increasing threat to deep-sea ecosystems. Whilst peracarid crustaceans are used here as an exemplary taxon, the methodology described has broad relevance to many other deep-sea taxa, and thus will support broader research into deep-sea biodiversity and ecology more widely.

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“…Trawls and dredges can only generate qualitative or semi-quantitative data for deep-sea megafauna and macrofauna (Gage & Tyler, 1991;Narayanaswamy et al, 2016). Grabs and later corers were developed to take a known quantity of the seafloor so that organisms living both on and in the sediments could be identified, enumerated and their biomass estimated.…”

Section: Corersmentioning

confidence: 99%

“…deep-sea sediments (Narayanaswamy et al, 2016). The first grabs were developed for use in shallow water for investigations of the role of benthic communities in supporting fish stocks in Danish fjords (Petersen & Boysen Jensen, 1911;Table 3).…”

Section: Equipmentmentioning

confidence: 99%

Greetings from HYDRO 2023 Organizing Committee

Monaca

2024

IHR

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Protection of Literary and Artistic Works (1886), and except in the circumstances described below, no part may be translated, reproduced by any process, adapted, communicated or commercially exploited without prior written permission from the Secretariat of the International Hydrographic Organization (IHO). Copyright in some of the material in this publication may be owned by another party and permission for the translation and/or reproduction of that material must be obtained from the owner. This document or partial material from this document may be translated, reproduced or distributed for general information, on no more than a cost recovery basis. Copies may not be sold or distributed for profit or gain without prior written agreement of the IHO Secretariat and any other copyright holders.In the event that this document or partial material from this document is reproduced, translated or distributed under the terms described above, the following statements are to be included: "Material from IHO publication [reference to extract: Title, Edition] is reproduced with the permission of the IHO Secretariat (Permission No ……./…) acting for the International Hydrographic Organization (IHO), which does not accept responsibility for the correctness of the material as reproduced: in case of doubt, the IHO's authentic text shall prevail. The incorporation of material sourced from IHO shall not be construed as constituting an endorsement by IHO of this product." "This [document/publication] is a translation of IHO [document/publication] [name]. The IHO has not checked this translation and therefore takes no responsibility for its accuracy. In case of doubt the source version of [name] in [language]should be consulted."The IHO Logo or other identifiers shall not be used in any derived product without prior written permission from the IHO Secretariat. Cover imageThe cover image shows the Pisces VI deep-sea research submersible, which provides access to the deep ocean to study marine ecosystems. The related article by Alex David Rogers & Eva Ramirez-Llodra (pp. 10-37) shows how quantitative sampling methods and deep submergence technologies, as well as advances in fields such as acoustics and marine navigation, are enabling deep-sea exploration of marine ecosystems. The Nippon Foundation Nekton Ocean Census programme is an important initiative to accelerate the discovery of marine life. Photo: Nekton Foundation. Open Access PolicyThis journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge. About the JournalThe International Hydrographic Review (IHR) is an international scientific journal publishing peer-reviewed papers on all aspects of hydrography and associated subjects, ranging from the latest technical developments and significant events to book reviews and historical recollections. The IHR was first published in 1923 and since then has been published regularly.

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Corers and Grabs

Cited by 9 publications

References 25 publications

Response of the benthic biomass-size structure to a high-energy submarine canyon

Response of the benthic biomass-size structure to a high-energy submarine canyon

Challenges and Advances in the Taxonomy of Deep-Sea Peracarida: From Traditional to Modern Methods

Greetings from HYDRO 2023 Organizing Committee

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