Molecular species delimitation and its implications for species descriptions using desmosomatid and nannoniscid isopods from the VEMA fracture zone as example taxa

Brix, Saskia; Bober, Simon; Tschesche, Claudia; Kihara, Terue C.; Driskell, Amy C.; Jennings, Robert M.

doi:10.1016/j.dsr2.2018.02.004

Cited by 26 publications

(26 citation statements)

References 55 publications

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“…The dispersal potential across topographic barriers like the MAR and over large geographic distances was also reported recently for species of the spionid genus Laonice (Guggolz et al 2019). The importance of dispersal via larvae is emphasized by distribution patterns found for brooding taxa like isopods, which exhibited very limited or no gene flow across the MAR Brix et al 2018).…”

Section: Discussionsupporting

confidence: 66%

High diversity and pan-oceanic distribution of deep-sea polychaetes: Prionospio and Aurospio (Annelida: Spionidae) in the Atlantic and Pacific Ocean

et al. 2020

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Prionospio Malmgren 1867 and Aurospio Maciolek 1981 (Annelida: Spionidae) are polychaete genera commonly found in the deep sea. Both genera belong to the Prionospio complex, whose members are known to have limited distinguishing characters. Morphological identification of specimens from the deep sea is challenging, as fragmentation and other damages are common during sampling. These issues impede investigations into the distribution patterns of these genera in the deep sea. In this study, we employ two molecular markers (16S rRNA and 18S) to study the diversity and the distribution patterns of Prionospio and Aurospio from the tropical North Atlantic, the Puerto Rico Trench and the central Pacific. Based on different molecular analyses (Automated Barcode Gap Discovery, GMYC, pairwise genetic distances, phylogenetics, haplotype networks), we were able to identify and differentiate 21 lineages (three lineages composed solely of GenBank entries) that represent putative species. Seven of these lineages exhibited pan-oceanic distributions (occurring in the Atlantic as well as the Pacific) in some cases even sharing identical 16S rRNA haplotypes in both oceans. Even the lineages found to be restricted to one of the oceans were distributed over large regional scales as for example across the Mid-Atlantic Ridge from the Caribbean to the eastern Atlantic (> 3389 km). Our results suggest that members of Prionospio and Aurospio may have the potential to disperse across large geographic distances, largely unaffected by topographic barriers and possibly even between oceans. Their high dispersal capacities are probably explained by their free-swimming long-lived planktonic larvae.

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Section: Discussionsupporting

confidence: 66%

High diversity and pan-oceanic distribution of deep-sea polychaetes: Prionospio and Aurospio (Annelida: Spionidae) in the Atlantic and Pacific Ocean

et al. 2020

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“…For example, Eugerdella serrata Brix, 2006 has been previously described from the Weddell Sea (Boyko et al, onwards). However, equivalent morphotypes of E. serrata have been sampled from the Challenger Plateau, central Pacific and Atlantic abyss; thus, this species may be part of a species complex (see also Brix et al, ; Kaiser, unpubl. data).…”

Section: Discussionmentioning

confidence: 99%

Benthic boundary layer macrofauna from the upper slope of the Chatham Rise (SW Pacific)

Kaiser

Lörz

Bird³

et al. 2018

Marine Ecology

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Benthic boundary layer (BBL) communities are a taxonomically and functionally diverse but poorly known component of deep‐sea environments. We investigated macrofaunal assemblages across the upper slope of the Chatham Rise (CR) in the south‐western Pacific in relation to location, depth and sediment variables. Using data from the TAN1116 voyage to the CR in austral spring 2011, we assessed variation in abundance, faunal composition and diversity of three BBL compartments: fully suprabenthic taxa, taxa with suprabenthic affinities and fully epibenthic taxa across taxonomic levels (phylum, class, order, family, genus and species). In total, eight samples were taken using an epibenthic sledge across three areas on the CR (Mernoo Gap, CR North and CR South) and at two depth ranges (400–600 and 900–1,000 m) distributed along a north to south as well as east to west axis, crossing different productivity gradients. In contrast to previous studies from the CR, there was no significant correlation between macrofaunal densities and sediment variables or depth. Species diversity of isopods and tanaidaceans was average to high, compared to other geographic regions, but did not show any significant pattern with location or depth. Most species in these two groups (~82%) were new to science, probably reflecting the paucity of sampling and taxonomic study of these faunal components in New Zealand waters. Our results suggest employing finer‐scale investigations across a range of temporal and spatial scales and at finer taxonomic resolution would greatly further our knowledge and understanding of patterns and processes shaping deep‐sea BBL community structure.

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“…Our study of a community wehre over 87 % of the isopod species are new to science or described within the last two years, indicates the need for quick assessment tools like 450 species delimitation in the deep-sea environment. Additionally, taxonomic expertise is needed, which can lead to a description of the key species even though it is not possible to describe every species due to time constraints (Brix et al 2018). If no SD or other rapid assessment method is possible due to constraints in the sampling method or fixation of the samples, the taxonomic incompleteness leads to incomplete knowledge of species distributions, ecology, population dynamics, but also lower public interest in those species.…”

Section: Resultsmentioning

confidence: 99%

“…flow is lacking. Brix et al (2018) observed from SD data for desomomatids and nannoniscids of the VEMA fracture zone in the North Atlantic Ocean that even robustly-sampled species exhibit "small" ranges of around 500 km, and three species were distributed on the order of 1000-2500 km. Interestingly Wilson (2017), for the pacific abyss, measured the rate of species turnover.…”

Section: Discussionmentioning

confidence: 98%

“…1962 (Malyutina et al 2018) while for desmosomatids, nannoniscids and macrostylids the complete amount of available species and specimens (>400 specimens for both families, nannonicids and desmosomatids, resulted in 72 species for COI and 45 for 16S by species delimitation according to Brix et al 2018) was used. Our dataset used the complete set of specimens available in the family Munnopsidae and revealed that this swimming family is the only one showing potential species with atlantic-pacific distribution (in case of Acanthocope cf.…”

Section: Discussionmentioning

confidence: 99%

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

Brix¹,

Osborn²,

Kaiser³

et al. 2019

Preprint

Self Cite

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Abstract. Aim of our study is to gain a better knowledge about the isopod crustacean fauna of the abyssal Clarion Clipperton Fracture Zone (CCZ) located in the central Pacific Ocean. In total, we examined 22 EBS samples taken at 6 abyssal areas in the central pacific manganese nodule area (CCZ and DISCOL). The dataset comprised 619 specimens belonging to 187 species of four different isopod families: 91 species (48.6&#8201;% of total) belonging to Munnopsidae, 63 (33.6&#8201;%) to Desmosomatidae, 24 (12.8&#8201;%) to Haploniscidae and 9 (4.8&#8201;%) to Macrostylidae. The total number of species found was relatively similar between sites ranging from 38 (German Contractor area) to 50 species (French contractor area). 68 species were represented by singeletons. The ranges of distribution differ between families. In total 77&#8201;% of the species were recorded in a single area (and thus being unique for this specific area), 13.9&#8201;% in 2 areas, 5.3&#8201;% in 3 areas, 2.6&#8201;% in 4 areas and 1&#8201;% in 5 areas. The proportion of species present in a single area increased in this sequence: Munnopsidae (75.8&#8201;%), Desmosomatidae (77.7&#8201;%) and Haploniscidae (83&#8201;%). A total of 6 (66.6&#8201;%) out of 9 species of Macrostylidae was recorded in a single area contrasted by the most common species being from this family, Macrostylidae_Macrostylis_M05 with 46 specimens (present in all areas besides DISCOL) followed by several species of Munnopsidae with 10 or more specimens in the dataset. The CCZ areas show the highest number of shared species. Generally, the high diversity in each area is reflected by a low similarity between sampling areas. The rarefraction curves indicate that species richness is similar between areas, but the real number of species is still not sampled. The most distant areas from the central CCZ, the APEI3 and DISCOL, are the most different.

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Molecular species delimitation and its implications for species descriptions using desmosomatid and nannoniscid isopods from the VEMA fracture zone as example taxa

Cited by 26 publications

References 55 publications

High diversity and pan-oceanic distribution of deep-sea polychaetes: Prionospio and Aurospio (Annelida: Spionidae) in the Atlantic and Pacific Ocean

High diversity and pan-oceanic distribution of deep-sea polychaetes: Prionospio and Aurospio (Annelida: Spionidae) in the Atlantic and Pacific Ocean

Benthic boundary layer macrofauna from the upper slope of the Chatham Rise (SW Pacific)

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

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