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Dahms, Hans‐,Uwe,Tseng, Li‐,Chun,Hsiao, Shih‐,Hui,Chen, Qing‐,Chao,Hwang, Jiang‐,Shiou Springer Japan 2013 Ecological research Vol.28 No.2
<P><B>Abstract</B></P><P>The mesozooplankton of a river tributary in Oceania is evaluated and is correlated against environmental, abiotic, and biological attributes of this lotic system. Abundance, distribution, and the diversity of mesozooplankton was studied at nine stations including one estuarine station during ten sampling campaigns from June 2004 to December 2005 along the Lanyang River, the largest river and estuarine ecosystem in northeastern Taiwan. Mesozooplankton was dominated by copepods, cladocerans, and fish larvae. Among all samples, the highest abundances of mesozooplankton (5,049.36 individuals m<SUP>−3</SUP>) occurred in the estuary station in August 2004, which also corresponds to the highest salinities (37.0), indicating the marine role in shaping the estuarine planktonic assemblages. The abundance of mesozooplankton and number of mesozooplankton taxa were significantly higher in samples of the estuarine station than in the riverine stations (<I>p</I> < 0.05, one‐way ANOVA). The number of mesozooplankton taxa number was affected by water temperature (<I>r</I> = 0.697; <I>p</I> = 0.025, Pearson's correlation) that was primarily influenced by the weather that was in turn affected by seasonal monsoons.</P>
Hans-Uwe Dahms,주형민,이재형,윤미선,안소현,이상헌 한국해양과학기술원 2015 Ocean science journal Vol.50 No.4
Demersally drifting organisms were collected at Ny Ålesund (Svalbård – Arctic Ocean) to study the taxon composition and relative abundances in the Arctic summer. Catch potentials of two collection devices for demersal drift were compared. A lowvolume submersible drift-pump and a drift-net unit were employed for the collection of demersally drifting biota, particularly for shallow aquatic habitats. With the exception of Appendicularia, Chaetognatha, Coelenterata, and Ctenophora, which were damaged at times, the pump catches were in good condition and sufficient for identification and quantification of less mobile fauna. A comparison of the two devices revealed that the drift-pump collected more specimens than the drift-net. However, the drift-net may have caused an underestimation of the abundances of invertebrates. No differences in identified taxon number and indices of richness, evenness and diversity were found. However, the proportion of invertebrate animals in the two devices was different for the three groups: zooplankton, macrofauna and meiofauna. At Svalbård, zooplankton, larvae of macrofauna, and meiofauna were successfully collected by the two collecting devices. However, the catchibility of the two devices in collecting various invertebrate taxa was different and, therefore, a sound ‘Device Effect’ was revealed.
Ki, Jang-Seu,Dahms, Hans-Uwe,Hwang, Jiang-Shiou,Lee, Jae-Seong Elsevier 2009 Comparative biochemistry and physiology. Part D, G Vol.4 No.4
<P><B>Abstract</B></P> <P>In this study, we analyzed the complete mitochondrial (mt) genome of a hydrothermal vent crab <I>Xenograpsus testudinatus</I> (Decapoda: Brachyura) obtained from the hydrothermal vents off Kueishantao Island, Taiwan, which extend from the deep sea Okinawa Trench. The mitogenome of <I>X. testudinatus</I> was 15,796 bp in length and contained the same 37 genes (e.g. 2 <I>rRNA</I>s, 22 <I>tRNA</I>s, and 13 <I>PCG</I>s) found in other metazoan mitogenomes. Analysis of the structural mt gene order in <I>X. testudinatus</I> revealed that the 13 PCGs, excluding a translocation of ND6-Cyt b cluster, were similarly ordered when compared to the pancrustacean ground pattern; however the tRNAs were severely rearranged. Phylogenetic analysis of decapod mitogenomes showed that the molecular taxonomy of the vent crab was in accordance with its morphological systematics. Together, these findings suggest that the vent crab studied here has little mitochondrial genetic variation when compared with morphologically defined conspecifics from other marine habitats.</P>
Song, Sung Joon,Dahms, Hans-Uwe,Lee, Chang-Rae,Ryu, Jongseong,Khim, Jong Seong Cambridge University Press 2014 Journal of the Marine Biological Association of th Vol.94 No.5
<P>A new species of <I>Paracrenhydrosoma</I> (Copepoda: Harpacticoida: Cletodidae) is described from samples taken from muddy bottoms in Jangmok, Geoje Island, Korea. The genus <I>Paracrenhydrosoma</I> is distinguished from other genera of the <I>Acrenhydrosoma</I>-complex (<I>Acrenhydrosoma</I>, <I>Dyacrenhydrosoma</I> and <I>Neoacrenhydrosoma</I>) by carrying an antennal exopod with two setae, P1 endopod with three setae, P3 endopod with two setae and P5 exopod with two setae. The new species differs from its congeners as follows: bifid rostrum on anterior margin, long caudal ramus, exceedingly long baseoendopodal mucroniform process of female P5 that reaches the end of the second free abdominal segment, and modified P3 endopod of male. A tabular key to aid in the identification of the <I>Acrenhydrosoma</I>-complex is provided. The worldwide distribution of the <I>Acrenhydrosoma</I>-complex is summarized and discussed.</P>
Song, Sung Joon,Dahms, Hans-Uwe,Kangtia, Pawana,Chullasorn, Supawadee,Ryu, Jongseong,Khim, Jong Seong Taylor Francis 2015 Marine biology research Vol.11 No.5
<P>Peltidium byungwooi sp. nov. is described in morphological detail from samples collected from the macroalgal beds on rocky bottoms using a light trap from Yeoseodo Island, Korea. Our studies revealed the following morphological diagnostic characters: body strongly chitinized and dorsoventrally flattened; antennule 7-segmented; antenna with allobasis, exopod 2-segmented, bearing one and three setae, respectively; allobasis of maxilla bilobed, drawn out into a small claw with two accessory setae; endopod represented by a small protuberance bearing one seta; swimming legs P2-P4 exp-3 with two outer spines; P2 enp-1 without inner seta; P3 enp-3 with two inner setae; inner endopodal lobe of female P5 with very short outer seta (about 5.4 times shorter than inner one, 3.6 times in male); male P2 enp-3 bearing modified inner distal spine with blunt tip. Phylogenetic, zoogeographic, biological, and ecological characteristics of the family Peltidiidae are reviewed for the genus Peltidium.http://zoobank.org/urn:lsid:zoobank.org:pub:765492B8-73DF-4650-BDFA-71C73BBD7600</P>