A new genus of Munnopsidae Lilljeborg, 1864 (Crustacea, Isopoda), with descriptions of two abyssal new species from the Clarion Clipperton Fracture Zone, north-eastern tropical Pacific

Malyutina, Marina V.; Kihara, Terue C.; Brix, Saskia

doi:10.1007/s12526-020-01061-z

Cited by 10 publications

(6 citation statements)

References 38 publications

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“…Poisson tree processes (PTPs) and multi-rate PTPs were run using the stand-alone mPTP software implementing single-and multi-switch commands on the fully bifurcated trees generated in this paper. Our data contained multiple individuals with the same haplotypes, but the replicate haplotypes can confound delimitation analyses and lead to over-splitting (Marki et al, 2018), so we calculated the minimum branch length for each sequence and used the minimum branch threshold option in order to ignore these replicate branches in subsequent PTP/mPTP analyses. Markov chain Monte Carlo (MCMC) analyses were run for 100 million generations, sampling every 10 000 and discarding the first 2 million generations as burn-in.…”

Section: Molecular Species Delimitationmentioning

confidence: 99%

Adult life strategy affects distribution patterns in abyssal isopods – implications for conservation in Pacific nodule areas

et al. 2020

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Abstract. With increasing pressure to extract minerals from the deep-sea bed, understanding the ecological and evolutionary processes that limit the spatial distribution of species is critical to assessing ecosystem resilience to mining impacts. The aim of our study is to gain a better knowledge about the abyssal isopod crustacean fauna of the central Pacific manganese nodule province (Clarion–Clipperton Fracture Zone, CCZ). In total, we examined 22 epibenthic sledge (EBS) samples taken at five abyssal areas located in the central northern Pacific including four contracting areas and one Area of Particular Environmental Interest (APEI3). Additional samples come from the DISturbance and reCOLonization experiment (DISCOL) area situated in the Peru Basin, southeastern Pacific. Using an integrative approach that combined morphological and genetic methods with species delimitation analyses (SDs) we assessed patterns of species range size, diversity, and community composition for four different isopod families (Munnopsidae Lilljeborg, 1864; Desmosomatidae Sars, 1897; Haploniscidae Hansen, 1916; and Macrostylidae Hansen, 1916) displaying different dispersal capacities as adults. Isopods are brooders, so their distribution and connectivity cannot be explained by larval dispersal but rather by adult locomotion. In particular, our objectives were to (1) identify potential differences in the distributional ranges of isopod families relative to their locomotory potential and to (2) evaluate the representativeness of the APEI for the preservation of regional biodiversity in the CCZ following mining disturbances. From 619 specimens, our SD analysis could distinguish 170 species, most of which were new to science (94.1 %). We found that increased locomotory ability correlated with higher species diversity with 9 species of Macrostylidae, 23 of Haploniscidae, 52 of Desmosomatidae, and 86 of Munnopsidae. This is supported by family-level rarefaction analyses. As expected, we found the largest species ranges in the families with swimming abilities, with a maximum recorded species range of 5245 and 4480 km in Munnopsidae and Desmosomatidae, respectively. The less motile Haploniscidae and Macrostylidae had maximal species ranges of 1391 and 1440 km, respectively. Overall, rarefaction analyses indicated that species richness did not vary much between areas, but the real number of species was still not sufficiently sampled. This is also indicated by the large proportion of singletons (40.5 %) found in this study. The investigated contractor areas in the CCZ were more similar in species composition and had a higher proportion of shared species between each other than the closely located APEI3 and the distantly located DISCOL area. In fact, the DISCOL area, located in the Peru Basin, had more species in common with the core CCZ areas than APEI3. In this regard, APEI3 does not appear to be representative as serving as a reservoir for the fauna of the investigated contractor areas, at least for isopods, as it has a different species composition. Certainly, more data from other APEIs, as well as preservation reference zones within contractor areas, are urgently needed in order to assess their potential as resources of recolonization of impacted seabed.

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Section: Molecular Species Delimitationmentioning

confidence: 99%

Adult life strategy affects distribution patterns in abyssal isopods – implications for conservation in Pacific nodule areas

et al. 2020

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“…Despite the fact that the CCZ is perhaps the most persistently-studied abyssal ecosystem (Glover et al 2018), the high proportion of new species recorded and discovered (i.e. Bonifacio et al 2020;Christodoulou et al 2019Christodoulou et al , 2020Brix et al 2020) underlines the limited information presently available on its biodiversity. Megafauna biodiversity assessments in the CCZ and DEA areas are largely dependent on seafloor image surveys (i.e.…”

Section: Discussionmentioning

confidence: 99%

“…Accurate documentation of species diversity and geographic distribution are essential for marine ecosystems' management, which, despite recent scientific studies (i.e. Kersken et al 2018Kersken et al , 2019Jakiel et al 2019;Christodoulou et al 2020;Malyutina et al 2020;Gooday et al 2020), still remains poorly documented across the CCZ.…”

Section: Introductionmentioning

confidence: 99%

Taxonomic assessment of deep-sea decapod crustaceans collected from polymetallic nodule fields of the East Pacific Ocean using an integrative approach

et al. 2022

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Deep-sea decapod crustaceans (Crustacea: Decapoda) collected during nine research cruises to the Clarion-Clipperton Zone (CCZ) in the NE Pacific Ocean and the Peru Basin in the SE Pacific Ocean were studied comprehensively using an integrative taxonomic approach. The abyssal seafloors of both areas are rich in economically interesting polymetallic nodules. All specimens were morphologically identified and genetically analysed using a fragment of the mitochondrial cytochrome c oxidase subunit I (COI). Eight species were collected, comprising three anomurans, three carideans, one dendrobranchiate, and one brachyuran, from water depths ranging between 4089 and 4511 m. COI sequences for representatives of the genera Parapagurus Smith, 1879, Ethusina SI Smith, 1884, and Bathystylodactylus Hanamura & Takeda, 1996 are provided for the first time. The molecular barcodes of the species provided herein will be valuable for the full taxonomic assignment of sequences produced in future metabarcoding and eDNA monitoring work. The new records extend the geographical distributional ranges or fill geographical gaps of the species reported, although none of the species is endemic to polymetallic nodule areas. This study is part of a taxonomic series aiming to describe the biodiversity of areas targeted for future deep-sea mining.

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“…This is also due to the fact that with increasing use of molecular tools in taxonomy, often more (new) species are discovered than being described (Pante et al, 2015), a condition that is also observed in studies of deep-sea peracarids (Jennings et al, 2018;Brix et al, 2020;Kaiser et al, 2021;Mohrbeck et al, 2021). Reasons for this gap are manifold: for instance, definitive (morphological and molecular) evidence of a new species is absent, the authors lack taxonomic expertise or there is not enough time to describe all the species in the duration of a (post doc) project (Pante et al, 2015;Brix et al, 2020;Malyutina et al, 2020;Kaiser et al, 2021).…”

Section: Species Descriptionsmentioning

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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A new genus of Munnopsidae Lilljeborg, 1864 (Crustacea, Isopoda), with descriptions of two abyssal new species from the Clarion Clipperton Fracture Zone, north-eastern tropical Pacific

Cited by 10 publications

References 38 publications

Adult life strategy affects distribution patterns in abyssal isopods – implications for conservation in Pacific nodule areas

Adult life strategy affects distribution patterns in abyssal isopods – implications for conservation in Pacific nodule areas

Taxonomic assessment of deep-sea decapod crustaceans collected from polymetallic nodule fields of the East Pacific Ocean using an integrative approach

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

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