Physical and biological roles of mesoscale eddies in Japanese eel larvae dispersal in the western North Pacific Ocean

Chang, Yu-Lin K.; Miyazawa, Yasumasa; Béguer‐Pon, Mélanie; Han, Yi; Ohashi, Kyoko; Jiang, Sheng

doi:10.1038/s41598-018-23392-5

Cited by 18 publications

(15 citation statements)

References 55 publications

(68 reference statements)

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“…Stream (Anderson and Robinson, 2001), as well as for holoplankton, as seen in the North Pacific (Mackas et al, 2005). For fish larvae, both physical trapping and biological attraction to food contribute to the retention of fish larvae in eddies in the North Pacific (Chang et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

Meroplankton community structure across oceanographic fronts along the South Brazil Shelf

Brandão

Garcia

Freire

2020

Journal of Marine Systems

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The influence of oceanographic fronts on the abundance and community composition of invertebrate larvae, mostly of benthic species, along nearly 2000 km of the southwestern Atlantic shelf (21-34°S) was investigated. Meroplankton was sampled through vertical hauls at 89 stations, distributed along 14 crossshelf transects, during late spring 2010 and early summer 2011. Salinity and temperature were registered with a CTD/rosette system, which provided seawater for chlorophyll-a and nutrient concentrations estimations. Vertical profiles of temperature, salinity, chlorophyll-a and nutrients were used as proxies of the fronts. In addition, high-resolution thermosalinograph data were used to detect surface frontal features. Meroplankton abundance peaks were found at several fronts intersected by the ship, including upwelling zones, estuarine and plume fronts, a shelf-break front, and two cyclonic eddies. Furthermore, meroplankton abundance was also relatively higher at small-scale thermal and/or saline surface fronts observed along the shelf. Such increases in meroplankton abundance are likely to be ascribed to high nutrient input and primary production. Distinct taxa of invertebrate larvae occurred at different types of fronts, besides the coastal realm, which was virtually dominated by decapod, cirripede and bivalve larvae. Small-scale shelf fronts presented high abundances of decapod and gastropod larvae, for instance, while larvae of polychaetes were the most frequent in the estuarine front of Patos Lagoon section. Highlights► The sampling area covers 13° of latitudinal gradient and up to 400 km offshore. ► Large-scale maps of abundance of the main meroplanktonic groups are presented. ► Physical, chemical and biological variables are analyzed together. ► Influence of distinct types of fronts on meroplankton abundance is discussed.

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Section: Discussionmentioning

confidence: 99%

Meroplankton community structure across oceanographic fronts along the South Brazil Shelf

Brandão

Garcia

Freire

2020

Journal of Marine Systems

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“…A deeper understanding of the magnitude and time scale of temperature variations is necessary to comprehend the biophysical relationships governing coral reef ecosystems in NW and other locations, such as southern Great Barrier Reef 24 and upper Florida Keys 23 , which are also influenced by mesoscale eddies. Mesoscale eddies play an important role in various physical, chemical, and biological processes such as facilitating mass transport, inducing nutrient flux, enhancing primary production, and promoting organism dispersal [51][52][53] . Pursuing more biophysical studies on the effects of mesoscale eddies may provide a better understanding of the influence of temperature extremes and variability on coral reefs.…”

Section: Discussionmentioning

confidence: 99%

Temporal variation in daily temperature minima in coral reefs of Nanwan Bay, Southern Taiwan

Lee

Fan

Fu³

et al. 2020

Sci Rep

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temporal variation in seawater temperature plays a crucial role in coral reef ecology. nanwan Bay, Southern taiwan is home to well-developed coral reefs, which frequently experience cold-water intrusions caused by internal wave-induced upwelling, that manifest in distinct daily temperature minima. these temperature minima and their associated sources were studied by recording in situ bottom temperatures and sea levels observed at depths of 5 and 30 m from May 2007 to September 2008. These data were then compared to the East Asian Seas Nowcast/Forecast System, and it was found that daily temperature minima presented large variations with magnitudes of 2-3 °C over periods from days to months. it was further demonstrated that the cold-water intrusions may have originated from depths of ~100 m and were strongly affected by westward propagating mesoscale eddies from the Pacific basin. An impinging warm anticyclonic eddy in July 2007 may have combined with the El Niño, resulting in temperatures surpassing 29 °C and degree heating days >4.0 °C-days at both depths, which were coincidental with a mass coral bleaching event. this eddy's impact was additionally evident in high correlations between daily temperature minima and residual sea levels, suggesting that mesoscale eddies alter stratification, substantially influence temperature variation, and play important roles in understanding ecological processes on coral reefs. Marine environmental conditions vary on multiple temporal scales, and under the influence of climate change, these conditions are likely to change in frequency and magnitude. Seawater temperature is a crucial environmental factor in determining drivers of coral physiology and coral reef ecology 1-4. Mass coral bleaching and mortality, caused predominately by abnormally warm events 5-7 and sometimes by anomalously cold ones 8,9 , highlight the importance of understanding and forecasting seawater temperature variations and extremes 10-12. The effect of seasonal and monthly (lunar) variations in seawater temperature on coral reef ecosystems is well recognized 13 , yet temporal variation on a daily to weekly or shorter scales is rarely studied 7. This is unfortunate given that corals exposed to large daily temperature fluctuations may possess elevated thermal tolerance 12,14. The risk of coral bleaching may also be reduced by high-frequency temperature variability 12. The largest temperature fluctuations in coral reefs are often associated with intermittent upwelling induced by internal waves 7,12,13. Since upwelled cold water has the capacity to act as a buffer from thermal stress during abnormally warm events, these reefs may become refuges in a warming ocean 14-17. Corals inhabiting intermittent upwelling environments have shown a variety of benefits, ranging from improved growth 18 and energy reserves 19 , to enhanced metabolic plasticity 20 , and site-specific physiological acclimatization 21,22. Yet, the influence of mesoscale eddies on corals in these dynamic environments remains unclear 23,24. Fringi...

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“…Following previous studies [12, 13], horizontal swimming in the same direction as the ambient current and DVM were set to be age-dependent and included a linear increase of body length. Because the 24-hour continuous swimming assumed in previous studies [12, 31, 32] would be energy consuming during long-term migration, and the newborn larvae may just drift with ocean currents while they are feeding and growing, v-larvae were set to start swimming when they reached 30-days old, and they only swam during daytime and passively drifted in ocean currents at night [24]. Swimming speed was set to increase 0.075 cm/s per day from zero at starting at 30 days after release, with a maximum speed of 15 cm/s that would be reached when the larvae reach their maximum size (60 mm TL) [41].…”

Section: Methodsmentioning

confidence: 99%

“…However, several other oceanic factors have been investigated as possibly affecting interannual levels of recruitment success using larval transport modelling simulations, which are not related to the large meander. These included El Niño or La Niña conditions [15, 30], NEC bifurcation latitude [12, 14], offshore mesoscale eddies [31, 32]. Various effects were found, with especially the NEC and Kuroshio seeming to have some influence on recruitment success.…”

Section: Introductionmentioning

confidence: 99%

Influence of ocean circulation and the Kuroshio large meander on the 2018 Japanese eel recruitment season

et al. 2019

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Japanese eel (Anguilla japonica) recruitment to Japan was very low during the early 2017−2018 recruitment season when most glass eels are usually caught, but catches increased in the late recruitment season when recruitment usually decreases. Concurrently, the Kuroshio meander south of Japan had formed again after the previous event ended in 2005. The role of the large meander and ocean circulation features such as the North Equatorial Current (NEC) in the unusual 2017−2018 Japanese eel recruitment timing-pattern was investigated using a three-dimensional particle tracking model that simulated swimming behaviors of virtual larvae (v-larvae) in addition to their drift in ocean currents. Four recruitment seasons were selected for when the Kuroshio large meander was present (2004−2005, 2017−2018) or absent (2009−2010, 2015−2016), and when NEC was shifted north (2004−2005, 2015−2016) or south (2009−2010, 2017−2018). The simulated recruitment timing-patterns were similar to the actual recent-year recruitment, with no early recruitment period v-larvae arrival to southern Japan and increased late period recruitment occurring. Rather than being related to the presence of the Kuroshio large meander, the late arrival appeared to be caused by a southward shifted, weak North Equatorial Current near the spawning area, a longer Subtropical Countercurrent eddy region retention time, and a weak Kuroshio during the early migration and recruitment period of those years. In the late recruitment period, the Kuroshio was stronger than other selected years near the East China Sea and south of Japan and v-larvae were transported more rapidly. The Kuroshio large meander may influence local eel recruitment in Japan, and the recirculation formed by the large meander could potentially enhance recruitment to the Tokai region. Oriented (northwestward) swimming v-larvae were less affected by the large meander, and showed higher recruitment success than those using along-current swimming. Although the Kuroshio large meander did not seem to be responsible for the unusual recruitment pattern in 2018, how Japanese eel larvae and glass eels actually cross out of the Kuroshio and reach coastal waters in Japan remains to be explored.

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Physical and biological roles of mesoscale eddies in Japanese eel larvae dispersal in the western North Pacific Ocean

Cited by 18 publications

References 55 publications

Meroplankton community structure across oceanographic fronts along the South Brazil Shelf

Meroplankton community structure across oceanographic fronts along the South Brazil Shelf

Temporal variation in daily temperature minima in coral reefs of Nanwan Bay, Southern Taiwan

Influence of ocean circulation and the Kuroshio large meander on the 2018 Japanese eel recruitment season

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