Research highlights

 

Recently Posts

Quantitative reconstruction of salinity history by otolith oxygen stable isotopes: An example of a euryhaline fish Lateolabrax japonicus

Quantitative reconstruction of salinity history by otolith oxygen stable isotopes: An example of a euryhaline fish Lateolabrax japonicus

Estuaries are important habitats for fishes and the understandings of habitat uses of fishes in the estuary can benefit the fishery management and species conservation. Several approaches can be used to study the habitat use of the fish. In this study, we analyze the oxygen isotope compositions (δ18Ootolith) in the [...]

 
Revisiting the data reduction of seafloor heat-flow measurement: The example of mapping hydrothermal venting site around Yonaguni Knoll IV in the South Okinawa Trough.

Revisiting the data reduction of seafloor heat-flow measurement: The example of mapping hydrothermal venting site around Yonaguni Knoll IV in the South Okinawa Trough.

The heat-flow research team of IONTU, established by Prof. Chuen-Tien Shyu, has devoted many years’ effort to develop the frontier, state of the art marine observation system for seafloor

 
Spatial and temporal variations of sediment metals in the Tuul River, Mongolia

Spatial and temporal variations of sediment metals in the Tuul River, Mongolia

Environmental Science and Pollution Research, in press https://doi.org/10.1007/s11356-019-06428-9 Mongolia has been a pristine environment without much pollution. Our objective is to study a section of the Tuul River to evaluate the present condition of this pristine environment. Sediment metal (Al, Fe, Mn, Cu, Zn, Pb, Ni, Cd, Hg, and Cr) [...]

 
OceanGliders: Boundary Ocean Observing Network (BOON)

OceanGliders: Boundary Ocean Observing Network (BOON)

The ocean is a crucial component of the global earth system, which affects the global/regional climate, weather, ecosystems, living resources and biodiversity. The ocean plays a major role in many human activities such as coastal protection, tourism, search and rescue

 
Seaglider observations revealed striking interleaving layers in the Kuroshio east of Taiwan

Seaglider observations revealed striking interleaving layers in the Kuroshio east of Taiwan

The underwater glider, a kind of unmanned underwater vehicle, has been used for ocean observations for more than ten years. It was not until 2015 the Ministry of Science

 
Resource availability affects temporal variation of phytoplankton size spectral slopes in the Kuroshio east of Taiwan

Resource availability affects temporal variation of phytoplankton size spectral slopes in the Kuroshio east of Taiwan

Fan-Sian Lin, Pei-Chi Ho & Chih-hao Hsieh Institute of Oceanography, National Taiwan University A study in the Kuroshio east of Taiwan led by master student Fan-Sian Lan, Dr. Pei-Chi Ho, Profs. Chih-hao Hsieh and Sen Jan at National Taiwan University, shows that the temporal variation of phytoplankton size spectral slops [...]

 
Acknowledging differences: number, characteristics, and distribution of marine benthic communities along Taiwan coast

Acknowledging differences: number, characteristics, and distribution of marine benthic communities along Taiwan coast

Our knowledge of the ability of coral reefs to face contemporary challenges disregards the wide variety of benthic communities (BCs) that could be associated with contrasted dynamics when facing stressors.

 
Exploration of the mesophotic coral ecosystems in Taiwan

Exploration of the mesophotic coral ecosystems in Taiwan

With the perspectives of using underwater robots to characterize mesophotic coral ecosystems in Taiwan, we are just back from our first field test of IONTU’s BlueROV2 (Blue Robotics Inc.) at Green Island (Ludao, Taiwan). Despite tough conditions at sea, we smoothly deployed our ROV down to -60 meters while analyzing [...]

 
Characterization of dissolved arsenics in the South China Sea

Characterization of dissolved arsenics in the South China Sea

Arsenic (As) is an extremely toxic element. But, this element has chemical similarity to that of Phosphorus, which P is an essential nutrient for all organisms. Indeed, arsenic in the ocean can be absorbed by microbes and then transferred to higher trophic

 
The Common Weak Biases of Pacific North Equatorial Countercurrent in Ocean Models Are Revealed

The Common Weak Biases of Pacific North Equatorial Countercurrent in Ocean Models Are Revealed

The Pacific North Equatorial Countercurrent (NECC) is a major upper-ocean zonal flow of the wind-driven circulation in the tropical Pacific, flowing eastward across the Pacific Ocean basin between 2°N and 10°N. The NECC transport is about 10-30 Sv eastward out of the warm pool region to the relatively cold eastern [...]

 
“Haste makes waste” in the evolution of typhoons

“Haste makes waste” in the evolution of typhoons

Two functional-improved data buoys, assembled and deployed by a research and technical team at National Taiwan University (NTU), survived from fierce wind and sea state of Super Typhoon Nepartak (Category 5) in the western North Pacific, and successfully recorded crucial air and sea variables within a few kilometers from the [...]

 
Steep redox gradient and biogeochemical cycling driven by deeply sourced fluids and gases in a terrestrial mud volcano

Steep redox gradient and biogeochemical cycling driven by deeply sourced fluids and gases in a terrestrial mud volcano

Pei-Ling Wang Microbial in subsurface environments would have exerted a profound impact on the cycling of carbon, nitrogen,

 
Species diversity of marine bacterioplankton communities is predictable due to macro-evolutionary constraints

Species diversity of marine bacterioplankton communities is predictable due to macro-evolutionary constraints

Hsiao-Pei Lu & Chih-hao Hsieh Institute of Oceanography, National Taiwan University A study in the East China Sea, led by Dr. Hsiao-Pei Lu and Prof. Chih-hao Hsieh, shows for the first time that diversity of marine bacteria community is strongly affected by macro-evolutionary constraints. This study is published (January, 2019) [...]

 
Biogeography of functional trait diversity in the Taiwanese reef fish fauna

Biogeography of functional trait diversity in the Taiwanese reef fish fauna

In Taiwan, the number of reef fish species decrease with latitude because of the changes in environmental conditions around the island. In this study published in January 2019 in Ecology and Evolution, a research team led by Dr. Vianney DENIS from the Institute of Oceanography (National Taiwan University) has investigated [...]

 
Formation and preservation of authigenic pyrite in the methane dominated environment

Formation and preservation of authigenic pyrite in the methane dominated environment

Dr. Lan-Feng Fan and Prof. Saulwood Lin from the Institute of Oceanography, explore authigenic pyrite formation and preservation in the methane dominated Environment.  This study,

 
Experiences gained from the 2018 IONTU-TUMSAT students exchange in Tokyo, Japan

Experiences gained from the 2018 IONTU-TUMSAT students exchange in Tokyo, Japan

Ching-Wei Wang and Chao-Yuan Yang The students exchange activity between IONTU and TUMSAT has been held for four years at both IONTU and TUMSAT. Under this mutual activity, we thank Professors Sen Jan, Yi-Jay Chang, Huei-Ting (Tina) Lin, and Vianney Denis for recommending us to visit TUMSAT in October 2018. [...]

 
Institute of Oceanography, National Taiwan University (IONTU) – Atmosphere and Ocean Research Institute, University of Tokyo (AORI) bilateral workshop

Institute of Oceanography, National Taiwan University (IONTU) – Atmosphere and Ocean Research Institute, University of Tokyo (AORI) bilateral workshop

IONTU-AORI bilateral workshop entitled “Northwestern Pacific Ocean Dynamics” was held on Dec 12-13, 2018. A total of 8 scientists (including a Ph.D student and a postdoc) from AORI were invited to IONTU. Accommodating four themes- Physical Oceanography, Marine Geology and Biogeography, Marine Biogeochemistry, and  Marine Biodiversity and Ecology, 14 oral [...]

 
Establishment of a novel genus for a marine bacterium recovered from the lagoon of Dongsha Island, Taiwan

Establishment of a novel genus for a marine bacterium recovered from the lagoon of Dongsha Island, Taiwan

More than forty isolates of marine, facultatively anaerobic, fermentative bacteria were recovered from sediment samples collected from the lagoon of Dongsha Island, Taiwan, using an anaerobic enrichment culture method. Two of the isolates were selected for characterization and classification in the present study.

 
Molecular assessment of Pocillopora verrucosa (Scleractinia; Pocilloporidae) distribution along a depth gradient in Ludao, Taiwan

Molecular assessment of Pocillopora verrucosa (Scleractinia; Pocilloporidae) distribution along a depth gradient in Ludao, Taiwan

Scleractinian corals identification is mainly based on their skeletal characteristics. However, skeletal features can vary

 
Numerical study and observation reveal dynamics for island wakes in the Kuroshio

Numerical study and observation reveal dynamics for island wakes in the Kuroshio

The wake features in the lee of Green Island off southeast of Taiwan are frequently observed by satellite images (Figure 1)

 
Spatial variation in the morphological traits of Pocillopora verrucosa along a depth gradient in Taiwan

Spatial variation in the morphological traits of Pocillopora verrucosa along a depth gradient in Taiwan

Coral taxonomy typically derives from descriptions of skeletal micro- and macrostructures, however, these characteristics may be altered

 
A small-scaled study provides insight into how fish adapt to future environmental changes

A small-scaled study provides insight into how fish adapt to future environmental changes

Hui-Yu Wang Climate change and anthropogenic effects have caused pronounced changes in physical habitats and biological functions for

 
Pelagic larval duration, growth rate, and population genetic structure ofthe tidepool snake moray Uropterygius micropterus around the southern Ryukyu Islands, Taiwan, and the central Philippines

Pelagic larval duration, growth rate, and population genetic structure ofthe tidepool snake moray Uropterygius micropterus around the southern Ryukyu Islands, Taiwan, and the central Philippines

Wen-Chien Huang  Jen-Chieh Shiao A study by graduate student Wen-Chien Huang and professors Jen-Chieh Shiao and Te-Yu Liao evaluated the effect of pelagic larval duration of demersal fishes on the population genetic structure

 
Fishing, rather than temperature, has the most prominent effect on size structure of exploited fish populations

Fishing, rather than temperature, has the most prominent effect on size structure of exploited fish populations

Chen-Yi Tu and Chih-hao Hsieh Institute of Oceanography, National Taiwan University A study by graduate students Chen-Yi Tu, Kuang-Ting Chen and Professor Chih-hao Hsieh, found that fishing has the most prominent effect

 
Predator and prey biodiversity relationship and its consequences on marine ecosystem functioning—Interplay between nanoflagellates and bacterioplankton

Predator and prey biodiversity relationship and its consequences on marine ecosystem functioning—Interplay between nanoflagellates and bacterioplankton

Jinny Yang and Chih-hao Hsieh Institute of Oceanography, National Taiwan University Understanding the biodiversity effects across trophic levels via predator-prey interactions is

 
D indices: novel biodiversity indices to disentangle food web complexity through network unfolding theory

D indices: novel biodiversity indices to disentangle food web complexity through network unfolding theory

The research project in Japan lead by the scientists in Research Institute for Humanity and Nature, Ryukoku University

 
Scientist of National Taiwan University leading the team with scientists in Japan won 18th Ecological Research Paper Award & 6th Taiwan-Japan Ecology Workshop will be organized in Tainan 2018

Scientist of National Taiwan University leading the team with scientists in Japan won 18th Ecological Research Paper Award & 6th Taiwan-Japan Ecology Workshop will be organized in Tainan 2018

Fei-Tsui Reservoir (FTR) and the simulated seasonal variations of depth profile of methane oxidizing bacteria (MOB).

 
Scientist of National Taiwan University joining with an international team develops a new method to examine the link between the time-varying interaction network and community stability in natural systems

Scientist of National Taiwan University joining with an international team develops a new method to examine the link between the time-varying interaction network and community stability in natural systems

Professor Chih-hao Hsieh from the Institute of Oceanography and Ph.D. student Chun-Wei Chang from Academia Sinica, together with an international research team

 
The Kuroshio research of Prof. Ming-Huei Chang is selected as the cover page of Deep-Sea Research

The Kuroshio research of Prof. Ming-Huei Chang is selected as the cover page of Deep-Sea Research

Prof. Ming-Huei Chang (in the photo below) reveals the physical processes underlying the Kuroshio meandering and transport variability east of Taiwan using an unprecedented 2-year field observational dataset

 
Elemental cycling in terrestrial mud volcanoes is affected by microbial communities and metabolic characteristics

Elemental cycling in terrestrial mud volcanoes is affected by microbial communities and metabolic characteristics

Methane is one of the most potent greenhouse gases in Earth’s atmosphere. It traps 28 times more heat per mass unit than carbon dioxide over a 100-year period.

 
Benthic community affects global carbon turnover on the seafloor

Benthic community affects global carbon turnover on the seafloor

Benthic fauna actively redistributes particles, water, and solutes in the sediment, contributing to the spatial and temporal heterogeneity of oxic, anoxic, and oscillatory redox zones. 

 
Marine bacterial and protist communities are differentially influenced by species sorting and dispersal limitation

Marine bacterial and protist communities are differentially influenced by species sorting and dispersal limitation

Wenxue Wu and Chih-hao Hsieh Institute of Oceanography, National Taiwan University Bacterial and protist communities are the two key components in marine microbial food webs. Even though they are both microbes, these two groups can be geographically structured in distinct manners due to their differences in organismal traits. For example, [...]

 
Observations in the context of numerical modeling examine the dynamics underlying eddy-Kuroshio interactions

Observations in the context of numerical modeling examine the dynamics underlying eddy-Kuroshio interactions

Mesoscale eddies are everywhere in the ocean. These ocean swirls of either clockwise or counterclockwise spinning with diameter of about 100-300 km

 

Faculty positions available at the Institute of Oceanography, National Taiwan University

The Institute of Oceanography, National Taiwan University (IONTU), invites applications for one or two faculty position(s), at the level of assistant professor or higher, starting on August 1, 2018. Applicants should hold a doctoral degree in research fields related to marine sciences, including physical oceanography, chemical oceanography, marine geology & [...]

 
The warm blob in the northeastern Pacific-the bridge leading to the 2015/16 El Niño

The warm blob in the northeastern Pacific-the bridge leading to the 2015/16 El Niño

Late in 2013 the sea became anomalously warm in the Gulf of Alaska. Known as the “warm blob”, these unusual conditions in the eastern North Pacific persisted for two years. At its peak, sea surface temperatures were 2.5 degrees higher than average (3-4 degrees in some specific regions). Down in [...]

 
A new functional approach investigating the role of coral assemblages based on colonies’ morphology

A new functional approach investigating the role of coral assemblages based on colonies’ morphology

Coral morphological groups and their richness have traditionally been used to compare functional compositions of coral assemblages because these groups play an important role in ecosystem processes and coral reef resilience. However, thus far, studies on this topic have remained descriptive and qualitative which are inadequate to describe changes affecting [...]

 
Dissolved and Colloidal Arsenic in the Western Philippine Sea

Dissolved and Colloidal Arsenic in the Western Philippine Sea

Arsenic (As) is an environmental toxicant and a major global concern in the world ocean. There are different chemical species for this element (arsenate, arsenite and methylated arsenic) in aquatic environments

 
Explore evolutionary forces underlying community assembly by tracking the strength of community-environment relationships at fine to broad taxonomic resolutions.

Explore evolutionary forces underlying community assembly by tracking the strength of community-environment relationships at fine to broad taxonomic resolutions.

Hsiao-Pei Lu and Chih-hao Hsieh Institute of Oceanography, National Taiwan University   Species is considered as the fundamental unit for ecological studies. Nevertheless, it is notable that living organisms are hierarchically organized: individuals can be classified into species, species into genera, genera into families, and so on. Previous studies on [...]

 
<!--:tw-->Lake warming and water level manipulation drive out rare species of phytoplankton, revitalizing debates on community structure<!--:-->

Lake warming and water level manipulation drive out rare species of phytoplankton, revitalizing debates on community structure

Aspecies-rich ecological community is composed of few abundant species and a large number of rare species. This universal phenomenon,known as species abundance distribution (SAD), hasintrigued a century of research to understand the underlying mechanism for a general law of community, yet remains controversial.In past, most of studies have treated SAD [...]

 
<!--:tw-->Scientist of National Taiwan University with an international team proposed a novel approach to assess the functional redundancy of ecosystem and the importance of biodiversity<!--:-->

Scientist of National Taiwan University with an international team proposed a novel approach to assess the functional redundancy of ecosystem and the importance of biodiversity

In order to quantitatively predict the impact of loss of species number on the provision of ecosystem services therefore human well-being, it is necessary to evaluate the functional redundancy of ecosystem. However, the functional redundancy has been overestimated due to the insufficient appreciation on complexity and multidimentionality of ecosystem functioning. [...]

 
<!--:tw-->Effects of size diversity on trophic interactions in ocean ecosystems<!--:-->

Effects of size diversity on trophic interactions in ocean ecosystems

  Lin Ye and Chih-hao Hsieh Institute of Oceanography, National Taiwan University   With the aid of new technologies to measure zooplankton size and community structure, a group of scientists of National Taiwan University formulated a novel hypothesis: increasing predator size diversity enhances the strength of top-down control on prey [...]

 
<!--:tw-->Scientist of National Taiwan University joining with an international team develops a new method that helps examine climate impacts on fisheries.<!--:-->

Scientist of National Taiwan University joining with an international team develops a new method that helps examine climate impacts on fisheries.

Associate Professor, Chih-hao Hsieh, from the Institute of Oceanography/Institute of Ecology and Evolutionary Biology, together with an international research team develops a method that helps examine nonlinear climate impacts on Pacific sardines. This study, published in Proceedings of the National Academy of Sciences (4/17/2013), provides a new solution to forecast [...]

 
<!--:tw-->Seasonal Changes in Gaseous Elemental Mercury in Relation to Monsoon Cycling over the Northern South China Sea<!--:-->

Seasonal Changes in Gaseous Elemental Mercury in Relation to Monsoon Cycling over the Northern South China Sea

Seasonal Changes in Gaseous Elemental Mercury in Relation to Monsoon Cycling over the Northern South China Sea Tseng, C. M., Liu, C. S., Lamborg, C., (2012), Atmos. Chem. Phys., 12, 7341-7350, doi:10.5194/acp-12-7341-2012. www.atmos-chem-phys.net/12/7341/2012/ The distribution of gaseous elemental mercury (GEM) was determined in the surface atmosphere of the northern South [...]

 
<!--:tw-->Incorporating habitat preference into the stock assessment and management of blue marlin (Makaira nigricans) in the Pacific Ocean<!--:-->

Incorporating habitat preference into the stock assessment and management of blue marlin (Makaira nigricans) in the Pacific Ocean

Stock assessments that include a spatial component or relate population dynamics to environmental conditions can be considered one way of implementing an ecosystem approach to fisheries. A spatially-structured population dynamics model that takes account of habitat preference is developed and then applied to Pacific blue marlin (Makaira nigricans), as they [...]

 
<!--:tw-->Modelling the growth of crustacean species<!--:-->

Modelling the growth of crustacean species

Crustaceans play an important role in marine ecosystem and worldwide fisheries. Accurate and quantitative description of growth is crucial in modelling the demographics and fisheries stock assessment. The stepwise growth as a result of the moulting process and the lack of permanent calcified structures make the traditional approaches developed for [...]

 
<!--:tw-->Species origin and cryptic species in the Coral Triangle<!--:-->

Species origin and cryptic species in the Coral Triangle

The Coral Triangle is known as marine biodiversity center according to its highestmarine biodiversity.However, the mechanism to form such a high biodiversity is still under debate. Pomacentruscoelestisis also known as neon damselfish which distributed across coral triangle has been used as a model species to reveal its phylogeographic structure and [...]

 
<!--:tw-->Research highlights of Prof. Wei-Jen Chen<!--:-->

Research highlights of Prof. Wei-Jen Chen

The research work in my (Wei-Jen Chen’s) lab can be summarized as the application of molecular and computational tools within a phylogenetic framework to interpret organismal diversity and to understand mechanisms of evolution (see: http://wjchen.actinops.googlepages.com/). The research accomplishments in 2012 have been focused on molecular systematics of two cypriniform fish [...]

 
<!--:tw-->Research highlights of Prof. Jen Chieh Shiao<!--:-->

Research highlights of Prof. Jen Chieh Shiao

Research topic 1 – Migratory life history of deep sea fishes We analyzed otolith microstructures and stable isotope of deep sea fishes to reveal their ontogenetic vertical (downward) migration. Otolith microstructures and δ18O showed different migratory patterns, e.g., migration timing and distances, among species. http://www.sciencedirect.com/science/article/pii/S0967063711002378 Research topic 2 –Eutrophication reduce [...]

 
<!--:tw-->Discrimination of Seismic Rupture Model for the 2011 Tohoku-Oki Earthquake Using Tsunami Simulation<!--:-->

Discrimination of Seismic Rupture Model for the 2011 Tohoku-Oki Earthquake Using Tsunami Simulation

Abstract Developing realistic, three-dimensional ruptures corresponding to a regional plate convergence is difficult to accomplish directly through band-limited ground-motion observations. A potential indirect method for this evaluation is to use a tsunami simulation to verify the rupture model reversely because the initial conditions of the associated tsunamis are caused by [...]

 
<!--:tw-->“Damned” Yangtze River Dam may affect the spawning migration of anchovy in the East China Sea<!--:-->

“Damned” Yangtze River Dam may affect the spawning migration of anchovy in the East China Sea

“Damned” Yangtze River Dam may affect the spawning migration of anchovy in the East China Sea Chen-Yi Tu and Chih-hao Hsieh Institute of Oceanography, National Taiwan University Using a coupled fish behavior–hydrodynamic model, a group of scientists of National Taiwan University suggest that the dammed Yangtze River could have negative [...]