New Macrostylidae (Isopoda) from the Northwest Pacific Basin described by means of integrative taxonomy with reference to geographical barriers in the abyss

Bober, Simon; Riehl, Torben; Henne, Stephan; Brandt, Angelika

doi:10.1093/zoolinnean/zlx042

Cited by 24 publications

(19 citation statements)

References 80 publications

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“…#12 were only detected east of the KKT. These biogeographic differences might indicate an isolating role of the KKT for the geographic distribution, as it was also revealed for the Ischnomesidae (Bober, 2019;Bober et al, this issue) and certain species of Macrostylidae (Bober et al, 2018c;Riehl et al, unpublished data). Cryptic speciation has been studied in several Southern Ocean isopod species.…”

Section: Depth Differencesmentioning

confidence: 68%

“…A different picture was shown for Macrostylis sabinae Bober, Riehl, Brandt, 2018 which also has a wide distribution in the NW Pacific, occurring on both sides of the KKT. In this case population-genetic analyses indicated restricted gene flow across the KKT, potentially leading to differentiation between populations (Bober et al, 2018c) which may be the beginning of a speciation event. The composition of the Macrostylidae was also investigated along the Vema Fracture Zone in an east-west direction as well as in the Puerto Rico Trench (Riehl et al, 2018).…”

Section: Depth Differencesmentioning

confidence: 94%

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Changes in species composition of Haploniscidae (Crustacea: Isopoda) across potential barriers to dispersal in the Northwest Pacific

Johannsen

Lins

Brandt

2020

Progress in Oceanography

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Speciation processes as drivers of biodiversity in the deep sea are still not fully understood. One potential driver for species diversification might be allopatry caused by geographical barriers, such as ridges or trenches, or physiological barriers associated with depth. We analyzed biodiversity and biogeography of 21 morphospecies of the deep-sea isopod family Haploniscidae to investigate barrier effects to species dispersal in the Kuril-Kamchatka Trench (KKT) area in the Northwest (NW) Pacific. Our study is based on 2652 specimens from three genera, which were collected during the German-Russian KuramBio I (2012) and II (2016) expeditions as well as the Russian-German SokhoBio (2015) campaign. The sampling area covered two potential geographical barriers (the Kuril Island archipelago and the Kuril-Kamchatka Trench), as well as three depth zones (bathyal, abyssal, hadal). We found significant differences in relative species abundance between abyssal and hadal depths. Haploniscus belyaevi Birstein, 1963 was the dominant species at abyssal stations while H. hydroniscoides Birstein, 1963 was prevalent in the hadal. Species composition also differed significantly across geographical barriers. While H. hydroniscoides was the most abundant species in the open NW Pacific, not a single specimen of this species was found in the Sea of Okhotsk, which is separated from the Pacific basin by the Kuril Islands. Furthermore, H. belyaevi and two morphologically highly similar morphospecies were the only species found in samples from the Sea of Okhotsk, meaning that the other 18 species, which we identified from our samples, did not occur west of the Kuril Islands. In this study, haploniscid species show very diverse patterns in geographic distribution between geographic areas and with depth. Therefore, the KKT might have an isolating effect on both the bathymetric as well as geographic distribution of some haploniscid species from the NW Pacific into the Sea of Okhotsk and from the western to the eastern abyssal margin of the KKT.

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Section: Depth Differencesmentioning

confidence: 68%

Section: Depth Differencesmentioning

confidence: 94%

Changes in species composition of Haploniscidae (Crustacea: Isopoda) across potential barriers to dispersal in the Northwest Pacific

Johannsen

Lins

Brandt

2020

Progress in Oceanography

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“…Little is known about the behaviour of deep-sea asellotes (Hessler and Strömberg, 1989) and most observations come from the 350 morphological descriptions of dead specimens. Especially Macrostylidae, a change to a more epifaunal lifestyle with sexually mature males reproducing with probably stationary females was discussed in species descriptions of strongly sexual dimorphic species (Bober et al, 2017;Kniesz et al, 2017). Sex-specific differences in dispersal capacities are known more from Macrostylidae than from Munnopsidae for which, to our knowledge, no dispersal effecting sexual dimorphisms are apparent.…”

Section: Discussionmentioning

confidence: 99%

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

Brix¹,

Osborn²,

Kaiser³

et al. 2019

Preprint

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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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“…Sars, 1899 (partial); Macrostylini Hansen, 1916, p. 74;Wolff, 1956, p. 99;Macrostylinae Birstein, 1963. Macrostylidae Gurjanova, 1933Menzies, 1962, p. 28, p. 127;Wolff, 1962, p. 90;Birstein, 1970;Menzies & George, 1972, p. 79-81;Mezhov, 1988, p. 983-994;Mezhov, 1992, p. 69;Brandt, 1992Brandt, , 2002Brandt, , 2004Kussakin, 1999, p. 336;Riehl & Brandt, 2010Riehl, Wilson & Hessler, 2012, 2014bBober et al, 2018b. Remarks: Macrostylidae is a monogeneric family (Riehl & Brandt, 2010) with currently 87 species validly described.…”

Section: Taxonomymentioning

confidence: 99%

“…Yet biogeographic studies point to a rather variable picture suggesting some macrostylids may disperse across considerable distances (Bober et al, 2018a;Riehl, Lins & Brandt, 2018;Riehl & Kaiser, 2012). Until now, worldwide species belonging to the family Macrostylidae have been formally described and are valid (Bober et al, 2018b;Riehl & Kühn, 2020).…”

Section: Introductionmentioning

confidence: 99%

Macrostylis metallicolaspec. nov.—an isopod with geographically clustered genetic variability from a polymetallic-nodule area in the Clarion-Clipperton Fracture Zone

Riehl

Smet

2020

PeerJ

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Background The Clarion-Clipperton Fracture Zone (CCFZ) in the Northeast Central Pacific Ocean is a region of heightened scientific and public interest because of its wealth in manganese nodules. Due to a poor ecological understanding at the abyssal seafloor and limited knowledge of the organisms inhabiting this area, huge efforts in alpha taxonomy are required. To predict and manage potential hazards associated with future mining, taxonomy is an essential first step to grasp fundamental ecosystem traits, such as biogeographic patterns, connectivity, and the potential for post-impact recolonization. Amongst samples from the Global Sea Mineral Resources NV exploration area (EA) in the CCFZ an undescribed species of the isopod crustacean family Macrostylidae was discovered. Previously, it has been reported from two other nearby regions, the Institut Français de Recherche pour l’Exploitation de la Mer and BGR EAs. There it was one of the more widely distributed and abundant species of the benthic macrofauna and exhibited geographically structured populations. It nevertheless remained taxonomically undescribed so far. Methods The new species is described by means of integrative taxonomy. Morphologically, macro photography, confocal microscopy, scanning electron microscopy and light microscopy were used to describe the species and to get first insights on its phylogenetic origin. Additionally, mitochondrial DNA markers were used to test the morphological allocation of the two dimorphic sexes and juvenile stages, to analyze geographic patterns of genetic differentiation, and to study intra-and inter-species relationships, also in light of previously published population genetics on this species. Results The new species, Macrostylis metallicola spec. nov., is a typical representative of Macrostylidae as recognizable from the fossosoma, prognathous cephalothorax, and styliform uropods. It can be morphologically distinguished from congeners by a combination of character states which include the autapomorphic shape of the first pleopod of the copulatory male. A sexual dimorphism, as expressed by a peculiar sequence of article length-width ratios of the male antennula, indicates a relationship with M. marionae Kniesz, Brandt & Riehl (2018) and M. longipes Hansen (1916) amongst other species sharing this dimorphism. Mitochondrial genetic markers point in a similar direction. M. metallicola appears to be amongst the more common and widely distributed components of the benthic macrofauna in this region which may suggest a resilience of this species to future mining activities because of its apparent potential for recolonization of impacted sites from adjacent areas of particular environmental interest. The genetic data, however, show geographic clustering of its genetic variability, pointing towards a limited potential for dispersal. Local extinction of populations could potentially not be compensated quickly and would mean a loss of genetic diversity of this species.

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New Macrostylidae (Isopoda) from the Northwest Pacific Basin described by means of integrative taxonomy with reference to geographical barriers in the abyss

Cited by 24 publications

References 80 publications

Changes in species composition of Haploniscidae (Crustacea: Isopoda) across potential barriers to dispersal in the Northwest Pacific

Changes in species composition of Haploniscidae (Crustacea: Isopoda) across potential barriers to dispersal in the Northwest Pacific

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

Macrostylis metallicolaspec. nov.—an isopod with geographically clustered genetic variability from a polymetallic-nodule area in the Clarion-Clipperton Fracture Zone

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