記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejj.24-17211

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3755/jcrs.26.19

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.2208/jscejj.24-17227

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掲載種別：研究論文（学術雑誌）  

DOI： 10.5194/gmd-16-5847-2023

Scopus

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掲載種別：研究論文（学術雑誌）  

DOI： 10.3923/pjbs.2023.534.542

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PubMed

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1029/2021JC018320

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掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/su14148948

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DOI： 10.1002/essoar.10511534.1

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記述言語：英語  

DOI： 10.3389/fmars.2022.823009

Web of Science

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掲載種別：研究論文（学術雑誌）   出版者・発行元：{MDPI} {AG}  

DOI： 10.3390/rs14081818

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Copernicus {GmbH}  

<jats:p>Abstract. In mangrove forests, soil salinity is one of the most significant environmental factors determining forest distribution and productivity as it
limits plant water uptake and carbon gain. However, salinity control on mangrove productivity through plant hydraulics has not been investigated by
existing mangrove models. Here we present a new individual-based model linked with plant hydraulics to incorporate physiological characterization of
mangrove growth under salt stress. Plant hydraulics was associated with mangroves' nutrient uptake and biomass allocation apart from water flux and
carbon gain. The developed model was performed for two coexisting species – Rhizophora stylosa and Bruguiera gymnorrhiza – in a
subtropical mangrove forest in Japan. The model predicted that the productivity of both species was affected by soil salinity through downregulation
of stomatal conductance. Under low-soil-salinity conditions (&lt; 28 ‰), B. gymnorrhiza trees grew faster and suppressed the
growth of R. stylosa trees by shading that resulted in a B. gymnorrhiza-dominated forest. As soil salinity increased, the
productivity of B. gymnorrhiza was significantly reduced compared to R. stylosa, which led to an increase in biomass of
R. stylosa despite the enhanced salt stress (&gt; 30 ‰). These predicted patterns in forest structures across the soil salinity
gradient remarkably agreed with field data, highlighting the control of salinity on productivity and tree competition as factors that shape the
mangrove forest structures. The model reproducibility of forest structures was also supported by the predicted self-thinning processes, which
likewise agreed with field data. Aside from soil salinity, seasonal dynamics in atmospheric variables (solar radiation and temperature) were
highlighted as factors that influence mangrove productivity in a subtropical region. This physiological principle-based improved model has the
potential to be extended to other mangrove forests in various environmental settings, thus contributing to a better understanding of mangrove
dynamics under future global climate change.
</jats:p>

DOI： 10.5194/bg-19-1813-2022

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掲載種別：研究論文（学術雑誌）   出版者・発行元：Frontiers Media SA  

The estimation of larval dispersal on an ecological timescale is significant for conservation of marine species. In 2018, a semi-population outbreak of crown-of-thorns sea star, <italic>Acanthaster</italic> cf. <italic>solaris</italic>, was observed on a relatively isolated oceanic island, Ogasawara. The aim of this study was to assess whether this population outbreak was caused by large-scale larval recruitment (termed secondary outbreak) from the Kuroshio region. We estimated larval dispersal of the coral predator <italic>A.</italic> cf. <italic>solaris</italic> between the Kuroshio and Ogasawara regions using both population genomic analysis and simulation of oceanographic dispersal. Population genomic analysis revealed overall genetically homogenized patterns among Ogasawara and other Japanese populations, suggesting that the origin of the populations in the two regions is the same. In contrast, a simulation of 26-year oceanographic dispersal indicated that larvae are mostly self-seeded in Ogasawara populations and have difficulty reaching Ogasawara from the Kuroshio region within one generation. However, a connectivity matrix produced by the larval dispersal simulation assuming a Markov chain indicated gradual larval dispersal migration from the Kuroshio region to Ogasawara in a stepping-stone manner over multiple years. These results suggest that the 2018 outbreak was likely the result of self-seeding, including possible inbreeding (as evidenced by clonemate analysis), as large-scale larval dispersal from the Kurishio population to the Ogasawara population within one generation is unlikely. Instead, the population in Ogasawara is basically sustained by self-seedings, and the outbreak in 2018 was also most likely caused by successful self-seedings including possible inbreeding, as evidenced by clonemate analysis. This study also highlighted the importance of using both genomic and oceanographic methods to estimate larval dispersal, which provides significant insight into larval dispersal that occurs on ecological and evolutionary timescales.

DOI： 10.3389/fmars.2021.688139

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掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/su14020706

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掲載種別：研究論文（学術雑誌）   出版者・発行元：Wiley  

DOI： 10.1002/lno.11934

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その他リンク： https://onlinelibrary.wiley.com/doi/full-xml/10.1002/lno.11934

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Copernicus {GmbH}  

<jats:p>Abstract. Seagrasses are marine flowering plants which are part of a highly productive coastal ecosystem and play key roles in the coastal processes. Unfortunately, they are declining in area coverage globally, and seagrass losses can be attributed to climate change such as sea-level rise, increase in sea surface temperature, and decrease in salinity, as well as human-related activities. The objective of this research is to assess the historical changes in the seagrass habitat and environment of Busuanga, Philippines using time series data available in the Google Earth Engine (GEE) platform. These include satellite data such as MODIS, Landsat 5, 7, and 8, and SeaWIFS. Reanalysis data such as HYCOM was also utilized in this research. Results from HYCOM data show that there has been a 0.0098 °C increase in the sea surface temperature per decade in Busuanga while MODIS data indicates an increase of 0.0045 °C per decade. Moreover, HYCOM data also shows an overall average of 0.76 mm in sea surface elevation anomaly and a decreasing trend in salinity values at 0.0026 psu per decade. Chlorophyll-a concentration has a minimal increase based on results from MODIS and SeaWIFS. Aside from changes in water parameters, changes in the land also affect seagrasses. Forest loss may cause increased siltation in the coastal ecosystem which can lead to seagrass loss. Based on the results of Landsat satellite image processing, there has been forest cover loss in Busuanga with the highest loss occurring in 2013 when super typhoon Yolanda ravaged the island. Lastly, results from the linear spectral unmixing of 778 Landsat images from 1987–2000 show that the average percent cover of seagrasses in Busuanga were declining through the years.
</jats:p>

DOI： 10.5194/isprs-archives-xliii-b3-2021-109-2021

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.ecss.2020.107152

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掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.ecss.2020.107014

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掲載種別：論文集(書籍)内論文  

DOI： 10.1007/978-981-16-2494-0_12

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掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/rs12010127

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10592-019-01228-7

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1111/1440-1703.12013

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.agwat.2018.11.014

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

As corals in tropical regions are threatened by increasing water temperatures, poleward range expansion of reef-building corals has been observed, and temperate regions are expected to serve as refugia in the face of climate change. To elucidate the important indicators of the sustainability of coral populations, we examined the genetic diversity and connectivity of the common reef-building coral Acropora hyacinthus along the Kuroshio Current, including recently expanded (<50 years) populations. Among the three cryptic lineages found, only one was distributed in temperate regions, which could indicate the presence of Kuroshio-associated larval dispersal barriers between temperate and subtropical regions, as shown by oceanographic simulations as well as differences in environmental factors. The level of genetic diversity gradually decreased towards the edge of the species distribution. This study provides an example of the reduced genetic diversity in recently expanded marginal populations, thus indicating the possible vulnerability of these populations to environmental changes. This finding underpins the importance of assessing the genetic diversity of newly colonized populations associated with climate change for conservation purposes. In addition, this study highlights the importance of pre-existing temperate regions as coral refugia, which has been rather underappreciated in local coastal management.

DOI： 10.1038/s41598-018-38333-5

PubMed

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DOI： 10.1007/978-981-13-1295-3_10

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Springer Verlag  

DOI： 10.1007/s00338-017-1632-3

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s10236-017-1096-6

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s40710-017-0217-z

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.marpolbul.2017.04.028

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：MDPI AG  

DOI： 10.3390/d8020009

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出版者・発行元：Springer Japan  

DOI： 10.1007/978-4-431-54364-0_8

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.3390/ijgi3041157

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s00338-013-1032-2

Web of Science

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1016/j.jsb.2012.05.017

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記述言語：日本語   出版者・発行元：一般社団法人日本地球化学会  

サンゴの生体内の情報を変数として含んだモデル（サンゴ内部モデル）に炭素安定同位体のマスバランスモデルを組み込むことで、サンゴ骨格に記録される炭素安定同位体比を再現するモデルを構築した。本研究で構築した内部モデルでは、サンゴの周囲の海水、腔腸内、石灰化母液のDICやTA、貯蔵される有機物、炭素同位体のマスバランスを、物質移動や光合成、呼吸、石灰化、Ca-ATPaseによる能動輸送 (trans-calcificationメカニズム) などによるフラックスから計算することでモデル化を行っている。モデルのシミュレーションの結果、サンゴの内部の炭酸系の動態はこのモデルで良く再現できていることが確認された。また、シミュレーションによって見積もられたサンゴ骨格の炭素同位体比は、昼の光合成や夜の呼吸などの影響を受けて非常に大きく日周変動することが認められた。

DOI： 10.14862/geochemproc.59.0.69.0

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s00338-008-0454-8

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Seven coral reef communities were defined on Shiraho fringing reef, Ishigaki Island, Japan. Net photosynthesis and calcification rates were measured by in situ incubations at 10 sites that included six of the defined communities, and which occupied most of the area on the reef flat and slope. Net photosynthesis on the reef flat was positive overall, but the reef flat acts as a source for atmospheric CO2, because the measured calcification/photosynthesis ratio of 2.5 is greater than the critical ratio of 1.67. Net photosynthesis on the reef slope was negative. Almost all excess organic production from the reef flat is expected to be effused to the outer reef and consumed by the communities there. Therefore, the total net organic production of the whole reef system is probably almost zero and the whole reef system also acts as a source for atmospheric CO2. Net calcification rates of the reef slope corals were much lower than those of the branching corals. The accumulation rate of the former was approximately 0.5 m kyr?1 and of the latter was ~0.7-5 m kyr?1. Consequently, reef slope corals could not grow fast enough to keep up with or catch up to rising sea levels during the Holocene. On the other hand, the branching corals grow fast enough to keep up with this rising sea level. Therefore, a transition between early Holocene and present-day reef communities is expected. Branching coral communities would have dominated while reef growth kept pace with sea level rise, and the reef was constructed with a branching coral framework. Then, the outside of this framework was covered and built up by reef slope corals and present-day reefs were constructed.

DOI： 10.1594/PANGAEA.721856

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

DOI： 10.1007/s00338-007-0262-6

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

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