Tardigrades of Alaska: distribution patterns, diversity and species richness

Johansson, Carl; Miller, William R.; Linder, Eric T.; Adams, Byron J.; Boreliz-Alvarado, Erika

doi:10.3402/polar.v32i0.18793

Cited by 22 publications

(9 citation statements)

References 26 publications

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“…Dastych 1985), (b) per weight of wet material (Everitt 1981) or (c) they completely omitted such calculations (e.g. Johansson et al 2013). However, the average density (9 ind g -1 ) recorded in the SEABIRD transect was comparable with our previous results from the Ariekammen and Rotjesfjellet slopes (Hornsund), which were also inhabited by little auks (9 ind g -1 ), although the elevation range sampled there (14-524 m asl, Zawierucha et al 2015b) was much wider than in the present study (only 0-72 m asl).…”

Section: Discussion Tardigrada Abundance and Species Compositionmentioning

confidence: 99%

The influence of a seabird colony on abundance and species composition of water bears (Tardigrada) in Hornsund (Spitsbergen, Arctic)

et al. 2015

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Seabirds in the Arctic are known to link marine and terrestrial ecosystems. They feed in the sea and breed on land, where they deposit enormous amounts of guano. Soil in the vicinity of seabird colonies is much more enriched with nutrients as compared to areas beyond their impact, which positively affects primary and secondary production. Water bears (Tardigrada) are microinvertebrates which constitute a permanent and ubiquitous faunal component of polar regions. Here, we tested the influence of seabird guano on Tardigrada communities; we established two transects in Hornsund (SW Spitsbergen): (1) SEABIRD where little auks (Alle alle) nested, and (2) CONTROL, an area without a little auk colony. In total, we collected 160 moss, lichen and mixed (moss/lichen) samples from those areas. In total, we found 1990 specimens belonging to 32 taxa (25 identified to species level). The average density of water bears was higher in the SEABIRD transect (9.31 ind g -1 ), where mosses predominated over lichens, in comparison with the CONTROL transect (5.83 ind g -1 ), where more lichens occurred. Thus, ornithogenic enrichment of soil and locally facilitated development of mosses over lichens might be important factors responsible for the increase in invertebrate abundance. According to canonical correspondence analysis, the little auk colony effect explained 13.2 % of the tardigrade species composition, and this factor appeared to be more important than the vegetation type itself. Four taxa, i.e. Isohypsibius cf. reticulatus, Microhypsibius bertolanii, Minibiotus cf. formosus and Ramazzottius cf. rupeus, have been recorded in the Svalbard archipelago for the first time.

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Section: Discussion Tardigrada Abundance and Species Compositionmentioning

confidence: 99%

The influence of a seabird colony on abundance and species composition of water bears (Tardigrada) in Hornsund (Spitsbergen, Arctic)

et al. 2015

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“…Ecological analyses of the tardigrades from the Arctic tundra have been conducted by Dastych (1985), Johansson et al (2013), Zawierucha et al (2015a, b) and Zawierucha et al (2016), who surveyed the influence of altitude, type of bedrock, seabird guano and substratum on tardigrade distribution, abundance, and species diversity. In this article, we provide novel information about Arctic tardigrade densities, species diversity and distribution with respect to environmental variables in Svalbard lichen samples, thus increasing our knowledge about this poorly studied tardigrade habitat.…”

Section: Introductionmentioning

confidence: 99%

Tardigrada in Svalbard lichens: diversity, densities and habitat heterogeneity

et al. 2017

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“…Remarks: Species reported from Argentina, Chile, Mongolia (probably), Spain, Svalbard, USA and locus typicus on Greenland (Maucci 1991(Maucci , 1996Kaczmarek and Michalczyk 2006;Guil 2008;Kaczmarek et al 2012a, b;Land et al 2012;Johansson et al 2013) (Table 3). This species is characterized by a very wide and relatively short buccal tube, claw configuration [3-3]-[3-3] and smooth cuticle.…”

Section: Milnesium Eurystomum Maucci 1991mentioning

confidence: 99%

“…Since the genus was recently redescribed (Michalczyk et al 2012a,b), many new records and species have been reported from various localities throughout the world (e.g. Kaczmarek et al 2012aKaczmarek et al ,b, 2014bMeyer and Hinton 2012;Johansson et al 2013;Hinton et al 2013;Meyer et al 2013Meyer et al , 2014Shaw and Miller 2013;Trygvadóttir and Kristensen 2013;Bartels et al 2014;Ciobanu et al 2014a,b;Lisi et al 2014;Zawierucha et al 2014;Melo et al 2014). Taking into consideration that some morphological characters were not mentioned in older records of the genus members, all the Milnesium records before 2012 should be verified (Michalczyk et al 2012a,b).…”

Section: Introductionmentioning

confidence: 99%

The genus Milnesium Doyère, 1840 (Tardigrada) in South America with descriptions of two new species from Argentina and discussion of the feeding behaviour in the family Milnesiidae

2015

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Background: The diversity and distribution of the tardigrades in South America are rather poor and selective, as is information about their feeding behaviour and diet. To date, only ca. 210 tardigrade taxa have been reported from the region of South America. In the present paper, we provide an update of the distribution of the genus Milnesium in South America and discuss some aspects of the feeding behaviour in the family Milnesiidae. Results: In seven moss samples collected in the Argentinean province of Río Negro, 31 specimens, 4 exuviae and 32 eggs belonging to the genus Milnesium were found. Among them, four species were identified: Milnesium argentinum sp. nov., Milnesium beatae sp. nov., Milnesium brachyungue and Milnesium granulatum. By its dorsal sculpture, M. argentinum sp. nov. is most similar to M. beatae sp. nov., Milnesium beasleyi and Milnesium berladnicorum, but it differs from M. beasleyi and M. berladnicorum mainly by having a different claw configuration and from M. beatae and M. beasleyi by having stylet supports inserted in a more caudal position and by some other morphometric characters. In the width of its buccal tube and the claw configuration [3-3]-[3-3], M. beatae sp. nov. is most similar to Milnesium bohleberi, M. brachyungue and Milnesium eurystomum, but it differs from them mainly by having a sculptured dorsal cuticle and by some other morphometric characters. Conclusions: The study discusses distribution and taxonomic problems of the Milnesium species known from South America. As of now, nine Milnesium taxa are known from this region (including two new species reported in this paper). Additionally, the study broadens our knowledge of tardigrades' feeding behaviour, provides some details about their diet and suggests that the type of prey chosen by some species belonging to the family Milnesiidae may be associated with the width of their buccal tube.

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Tardigrades of Alaska: distribution patterns, diversity and species richness

Cited by 22 publications

References 26 publications

The influence of a seabird colony on abundance and species composition of water bears (Tardigrada) in Hornsund (Spitsbergen, Arctic)

The influence of a seabird colony on abundance and species composition of water bears (Tardigrada) in Hornsund (Spitsbergen, Arctic)

Tardigrada in Svalbard lichens: diversity, densities and habitat heterogeneity

The genus Milnesium Doyère, 1840 (Tardigrada) in South America with descriptions of two new species from Argentina and discussion of the feeding behaviour in the family Milnesiidae

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