https://repository.kopri.re.kr/handle/201206/11919 2026-04-24T02:35:49Z https://repository.kopri.re.kr/handle/201206/13275 Title: Metamorphism obscures primary taphonomic pathways in the early Cambrian Sirius Passet Lagerstatte, North Greenland Authors: Nielsen, Morten Lunde; Lee, Mirinae; Ng, Hong Chin; Rushton, Jeremy C.; Hendry, Katharine R.; Kim, Ji-Hoon; Nielsen, Arne T.; Park, Tae-Yoon S.; Vinther, Jakob; Wilby, Philip R. Abstract: Correct interpretation of soft-bodied fossils relies on a thorough understanding of their taphonomy. While the focus has often been on the primary roles of decay and early diagenesis, the impacts of deeper burial and metamorphism on fossil preservation are less well understood. We document a sequence of late-stage mineral replacements in panarthropod fossils from the Sirius Passet Lagerstatte (North Greenland), an important early Cambrian Burgess Shale？type (BST) biota. Muscle and gut diverticula were initially stabilized by early diagenetic apatite, prior to being pervasively replaced by quartz and then subordinate chlorite, muscovite, and chloritoid during very low- to low-grade metamorphism. Each new mineral replicates the soft tissues with different precision and occurs in particular anatomical regions, imposing strong biases on the biological information retained. Muscovite and chloritoid largely obliterate the tissues’ original detail, suggesting that aluminum-rich protoliths may have least potential for conserving mineralized soft tissues in metamorphism. Overall, the fossils exhibit a marked shift toward mineralogical equilibration with the matrix, obscuring primary taphonomic modes. Sequential replacement of the phosphatized soft tissues released phosphorus to form new accessory monazite (and apatite and xenotime), whose presence in other BST biotas might signal the prior, more widespread, occurrence of this primary mode of preservation. Our results provide critical context for interpreting the Sirius Passet biota and for identifying late-stage overprints in other biotas. 2022-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/16148 Title: Trophic relations based on fecal DNA in tundra terrestrial food webs near Kongsfjorden, Svalbard, Norway Authors: Kim, Jihee; Lee, Won Young; Park, Sangkyu Abstract: For the conservation and management of the Arctic regions vulnerable to climate change, it is important to elucidate the trophic relations and food sources for consumers in the ecosystems. We analyzed DNA extracted from feces to understand the summer diets of the major terrestrial animals and their trophic relations in tundra ecosystems near Kongsfjorden, Svalbard. Feces of Svalbard reindeer (Rangifer tarandus platyrhynchus), Barnacle Goose (Branta leucopsis), Arctic fox (Vulpes lagopus), and Rock Ptarmigan (Lagopus muta) were collected during the summer seasons of 2014, 2015, 2018, and 2019. Plant DNA was detected in the feces of herbivores (reindeer, goose, and ptarmigan) and vertebrate DNA was detected in the feces of carnivore (Arctic fox) by amplifying, cloning, and Sanger sequencing. In case of Arctic fox, VulpesB, the blocking primer preventing from amplifying Arctic fox DNA, was used to improve the detection of their prey DNA. Salix was the most detected genus in feces of Svalbard reindeer and Barnacle Goose, which were described as feeding on graminoids, forbs, and prostrate as well as bryophyte. Bryophyte was added as an important food source for all herbivores. Arctic fox preferred birds such as geese (Anatidae) and gulls (Laridae), showing that interpretation between Arctic foxes and gulls may have occurred at the same predator level. Our results suggest that cloning-based DNA analysis using fecal sample contributes to understanding the tundra terrestrial food web near Kongsfjorden. 2022-01-01T00:00:00Z https://repository.kopri.re.kr/handle/201206/13553 Title: Enduring evolutionary embellishment of cloudinids in the Cambrian Authors: Park, Tae-Yoon S.; Jung, Jikhan; Lee, Mirinae; Lee, Sangmin; Zhen, Yong Yi; Hua, Hong; Warren, Lucas V.; Hughes, Nigel C. Abstract: The Ediacaran-Cambrian transition and the following Cambrian Explosion are among the most fundamental events in the evolutionary history of animals. Understanding these events is enhanced when phylogenetic linkages can be established among animal fossils across this interval and their trait evolution monitored. Doing this is challenging because the fossil record of animal lineages that span this transition is sparse, preserved morphologies generally simple, and lifestyles in the Ediacaran and Cambrian quite different. Here we identify derived characters linking some members of an enigmatic animal group, the cloudinids, which first appeared in the late Ediacaran, to animals with cnidarian-affinity from the Cambrian Series 2 and the Miaolingian. Accordingly, we present the first case of an animal lineage represented in the Ediacaran that endured and diversified successfully throughout the Cambrian Explosion by embellishing its overall robustness and structural complexity. Among other features, dichotomous branching, present in some early cloudinids, compares closely with a cnidarian asexual reproduction mode. Tracking this morphological change from late Ediacaran to the Miaolingian provides a unique glimpse into how a primeval animal group responded to the Cambrian Explosion. 2021-12-08T00:00:00Z https://repository.kopri.re.kr/handle/201206/14002 Title: The Complete Mitochondrial Genome of the Fourhorn Sculpin Triglopsis quadricornis (Perciformes, Cottidae) from Sirius Passet, North Greenland Authors: Kim, Bo-Mi; Kihm, Ji-Hoon; Park, Tae-Yoon S. Abstract: Triglopsis quadricornis Linnaeus, 1758 (Cottidae) is distributed in the Atlantic and Arctic and has four unique bony protuberances on its head. Here, we report the complete, circular, and annotated mitochondrial genome of T. quadricornis. The complete T. quadricornis mitochondrion was sequenced by high-throughput Illumina HiSeq platform. The sequences are 16,736 bp in size and contains 13 protein-coding genes (PCGs), 22 transfer RNA (tRNA) genes, a control region, and large and small ribosomal subunits. The overall genomic structure of T. quadricornis mitochondrion was conserved with the gene arrangement of Megalocottus and Myoxocephalus species, and phylogenetic analysis supports their sister relationships. Most PCGs consist of TAA or TAG as a termination codon, whereas COII, ND4, and CYTB have T-- as a stop codon. This complete mitochondrial DNA information of T. quadricornis will provide an essential genomic resource to elucidate the phylogenetic relationship and evolutionary history of the family Cottidae. 2021-12-01T00:00:00Z