Presence of &lt;i&gt;Prochlorococcus&lt;/i&gt; in the aphotic waters of the western Pacific Ocean

Abstract. Prochlorococcus, the smallest but most abundant marine primary producer, plays an important role in carbon cycling of the global ocean. As a phototroph, Prochlorococcus is thought to be confined to the euphotic zone, with commonly observed maximum depths of ∼150–200 m. But here we show, using flow cytometry and cellular ribosomal content, for the first time the presence of abundant and active Prochlorococcus in the dark ocean ("deep Prochlorococcus" hereafter). Intensive studies at the Luzon strait in the western Pacific Ocean show that the deep Prochlorococcus populations are exported from the euphotic zone. Multiple physical processes including internal solitary waves could be responsible for the transportation. The unexpected abundance of the tiny phototrophs in the dark ocean reveals a novel mechanism for picoplankton carbon export other than the known mechanisms such as sinking of phytodetritus and aggregates or grazing-mediated transportation. Such direct transportation of picoplanktonic phototrophs from surface to deep waters is poorly understood, but could significantly contribute to both the biological pump (through particulate organic carbon) and the microbial carbon pump (through release of dissolved organic carbon from microbial processes) for carbon sequestration in the ocean.

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Contribution to the knowledge of Galumnidae (Acari: Oribatida) in the Oriental region

Zootaxa ◽

10.11646/zootaxa.4647.1.23 ◽

2019 ◽

Vol 4647 (1) ◽

pp. 368-377 ◽

Cited By ~ 2

Author(s):

BADAMDORJ BAYARTOGTOKH ◽

SATOSHI SHIMANO

Keyword(s):

Body Size ◽

Pacific Ocean ◽

Western Pacific ◽

Specific Structure ◽

Western Pacific Ocean ◽

Habitat Ecology ◽

Oriental Region ◽

First Time ◽

The Western Pacific

We found two species of galumnid mites from Babeldaob Island of the Palau Republic, which is an island located in the western Pacific Ocean. In the present work, we describe Trichogalumna ekaterinae sp. nov., which is clearly different from other known species of Trichogalumna in the specific structure of sensillus, reduced number of notogastral porose areas, and smaller body size. A supplementary description of another species, Galumna flabellifera, which is recorded for the first time in Palau, is given. Furthermore, we discuss aspects of the distribution, diversity and habitat ecology of species belonging to these genera in the Oriental region.

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Two species of oribatid mites of the superfamily Ameroidea (Acari: Oribatida) from Babeldaob Island of Palau

Systematic and Applied Acarology ◽

10.11158/saa.24.7.10 ◽

2019 ◽

Vol 24 (7) ◽

pp. 1261-1271 ◽

Cited By ~ 2

Author(s):

Badamdorj Bayartogtokh ◽

Satoshi Shimano

Keyword(s):

Pacific Ocean ◽

Oribatid Mites ◽

Western Pacific ◽

Western Pacific Ocean ◽

Habitat Ecology ◽

Diagnostic Key ◽

First Time ◽

The Western Pacific

We found two species of oribatid mites from Babeldaob Island of Palau Republic, which is an island country located in the western Pacific Ocean. Eurhynchoribates brevisensillatus sp. nov. is proposed from mosses growing in the forest, and a diagnostic key to adults of all known species of Eurhynchoribates is provided. Another species, Basilobelba foliata Hammer, 1982 is reported for the first time from Palau, which was known previously from island of Bali, Indonesia. Following the descriptions and comparisons, we discuss aspects of the diversity, distribution and habitat ecology of species belonging to each genus.

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Taiwanese deep-water chitons (Mollusca: Polyplacophora) and survey of chiton fauna of Taiwan

Zootaxa ◽

10.11646/zootaxa.4422.3.1 ◽

2018 ◽

Vol 4422 (3) ◽

pp. 301 ◽

Cited By ~ 1

Author(s):

BORIS SIRENKO

Keyword(s):

Pacific Ocean ◽

Shallow Water ◽

Deep Water ◽

Deep Sea ◽

Western Pacific ◽

Western Pacific Ocean ◽

First Time ◽

The Western Pacific

Sixteen deep-sea polyplacophoran species are reported in this article, fifteen of which were found for the first time in the waters of Taiwan. Two of these species, Leptochiton taiwanensis n. sp. and L. wui n. sp., are described as new to science. Several of these species are distributed near Japan and in other areas of the western Pacific Ocean. Eight of the reported species live and feed on sunken wood. A survey of the polyplacophorans of Taiwan has also been conducted. The updated list of chitons collected near Taiwan at all depths contains 34 species. Seventeen of these species are shallow-water and seventeen species are deep-water chitons.

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