Spatial and temporal variation in otolith chemistry and its relationship with water chemistry: Stock discrimination of
            Sperata aor

Variation of water chemistry does not merely occur due to in situ chemical process, but also transport process. The study was carried out to address the role of subsurface flow dynamic on spatial and temporal variation of water chemistry in a headwater catchment. Hydrometric and hydrochemistry measurements were done in transect with nested piezometers, tensiometers, and suction samplers at different depths across hillslope and riparian zone in a 5.2 ha first-order drainage of the Kawakami experimental basin, Nagano, Central Japan from August 2000 to August 2001. Spatial variation of solute concentration was defined by the standard deviation and coefficient of variation of the seasonal observed concentrations. Autocorrelation analysis was performed to define temporal variation of solute concentration. The results showed that spatial variation of water chemistry was mainly influenced by the variation of subsurface flow through the hillslope and riparian zone. Solute concentration in the deep riparian groundwater was almost three times higher than that in the hillslope segment. A prominent downward flow in deep riparian groundwater zone provided transport of solutes to the deeper layer. Time series analysis showed that in the deep riparian groundwater, Ca2+, Mg2+, SO42- and HCO3- concentrations underwent a random process, Na+ concentration of a random process superimposed by a trend process, and SiO2 of a random process superimposed by a periodic process. Near the riparian surface, SO42- concentration was composed of a random process superimposed by a periodic process, whereas other solutes were mainly in a random process. In the hillslope soil water, there was no trend observed for the Na+ concentration, but there were for Ca2+ and Mg2+. The magnitude and direction of subsurface flow across hillslope and riparian zone created transport and deposition processes that changed solute concentration spatially and temporally.

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Spatial and Temporal Variation in Otolith Chemistry of Juvenile Atlantic Menhaden in the Chesapeake Bay

Transactions of the American Fisheries Society ◽

10.1080/00028487.2014.889748 ◽

2014 ◽

Vol 143 (4) ◽

pp. 1061-1071 ◽

Cited By ~ 12

Author(s):

Jason J. Schaffler ◽

Thomas J. Miller ◽

Cynthia M. Jones

Keyword(s):

Temporal Variation ◽

Chesapeake Bay ◽

Atlantic Menhaden ◽

Spatial And Temporal Variation ◽

Otolith Chemistry

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Spatial and temporal variation in the natal otolith chemistry of a Hawaiian reef fish: prospects for measuring population connectivity

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f08-052 ◽

2008 ◽

Vol 65 (6) ◽

pp. 1181-1192 ◽

Cited By ~ 18

Author(s):

Benjamin I. Ruttenberg ◽

Scott L. Hamilton ◽

Robert R. Warner

Keyword(s):

Temporal Variation ◽

Reef Fish ◽

Larval Dispersal ◽

Significant Variation ◽

Population Connectivity ◽

Marine Ecology ◽

Spatial And Temporal Variation ◽

Otolith Chemistry ◽

Methodological Development ◽

Larval Connectivity

One of the most compelling unanswered questions in marine ecology is the extent to which local populations are connected via larval exchange. Recent work has suggested that variation in the chemistry of otoliths (earstones) of fishes may function as a natural tag, potentially allowing investigators to determine sources of individual larvae and estimate larval connectivity. We analyzed the spatial and temporal variation in natal otolith chemistry of a benthic-spawning reef fish from the Hawaiian Islands. We found no consistent chemical variation at the largest scale (>100 km, among islands), but found significant variation at moderate scales (sites within islands, tens of kilometres) and small scales (clutches within sites), and chemistry of otoliths was not stable between years. These results imply that we may be able to use otolith chemistry to track larval dispersal only if the scales of dispersal match those of variation in natal otolith chemistry, and that separate natal otolith collections may be needed to track different cohorts of larvae. Finally, we found that elemental composition of recruit cores often did not match that of natal otoliths, suggesting that additional methodological development is required before we can effectively apply methods in otolith chemistry to the study of larval dispersal.

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Temporal and spatial variability in elemental composition of otoliths: implications for determining stock identity and connectivity of populations

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f02-040 ◽

2002 ◽

Vol 59 (4) ◽

pp. 669-679 ◽

Cited By ~ 129

Author(s):

Bronwyn M Gillanders

Keyword(s):

Temporal Variation ◽

Elemental Composition ◽

Juvenile Fish ◽

Spatial And Temporal Variation ◽

Otolith Chemistry ◽

Temporal And Spatial Variability ◽

Spatial Differences ◽

Elemental Fingerprint ◽

Temporal And Spatial ◽

Over Time

Interannual variability in elemental composition of otoliths may confound spatial interpretations. The elemental fingerprints of otoliths of juvenile fish were determined for fish collected from 12 to 15 estuaries in each of three consecutive recruitment years to determine temporal variation in otolith chemistry for each estuary. It was also examined whether there is overlap in elemental fingerprints of fish collected in different years and from different estuaries that may confound subsequent spatial comparisons. Significant differences in otolith chemistry were found among years for individual elements (lithium, manganese, strontium, and barium) and for multi-element fingerprints. Some estuaries showed large variation in multi-element fingerprints among years, whereas others showed little variation among years. There was some overlap of elemental fingerprints of different estuaries, but these were not always for fish collected in the same year. The significant spatial and temporal variation in elemental fingerprints meant that it was possible to confound spatial differences with temporal differences. Therefore, if the natal estuary of the adults is to be determined, a library of elemental fingerprints needs to be built up over time for each estuary rather than a single year-class of juveniles being used as the elemental fingerprint for a number of year-classes of adults.

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THE ROLE OF SUBSURFACE FLOW DYNAMIC ON SPATIAL AND TEMPORAL VARIATION OF WATER CHEMISTRY IN A HEADWATER CATCHMENT

Indonesian Journal of Agricultural Science ◽

10.21082/ijas.v8n1.2007.17-30 ◽

2016 ◽

Vol 8 (1) ◽

pp. 17

Author(s):

Tadashi Tanaka

Keyword(s):

Water Chemistry ◽

Temporal Variation ◽

Random Process ◽

Riparian Zone ◽

Subsurface Flow ◽

Solute Concentration ◽

Spatial And Temporal Variation ◽

Flow Dynamic ◽

Headwater Catchment

Variation of water chemistry does not merely occur due to in situ chemical process, but also transport process. The study was carried out to address the role of subsurface flow dynamic on spatial and temporal variation of water chemistry in a headwater catchment. Hydrometric and hydrochemistry measurements were done in transect with nested piezometers, tensiometers, and suction samplers at different depths across hillslope and riparian zone in a 5.2 ha first-order drainage of the Kawakami experimental basin, Nagano, Central Japan from August 2000 to August 2001. Spatial variation of solute concentration was defined by the standard deviation and coefficient of variation of the seasonal observed concentrations. Autocorrelation analysis was performed to define temporal variation of solute concentration. The results showed that spatial variation of water chemistry was mainly influenced by the variation of subsurface flow through the hillslope and riparian zone. Solute concentration in the deep riparian groundwater was almost three times higher than that in the hillslope segment. A prominent downward flow in deep riparian groundwater zone provided transport of solutes to the deeper layer. Time series analysis showed that in the deep riparian groundwater, Ca2+, Mg2+, SO42- and HCO3- concentrations underwent a random process, Na+ concentration of a random process superimposed by a trend process, and SiO2 of a random process superimposed by a periodic process. Near the riparian surface, SO42- concentration was composed of a random process superimposed by a periodic process, whereas other solutes were mainly in a random process. In the hillslope soil water, there was no trend observed for the Na+ concentration, but there were for Ca2+ and Mg2+. The magnitude and direction of subsurface flow across hillslope and riparian zone created transport and deposition processes that changed solute concentration spatially and temporally.

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