scholarly journals Discrimination of habitat use between two sympatric species of mullets, Mugil curema and Mugil liza (Mugiliformes: Mugilidae) in the rio Tramandaí Estuary, determined by otolith chemistry

2018 ◽  
Vol 16 (2) ◽  
Author(s):  
Ana C. G. Mai ◽  
Mauricio L. dos Santos ◽  
Valéria M. Lemos ◽  
João P. Vieira
Keyword(s):  
Habitat Use ◽  
Inductively Coupled Plasma ◽  
High Salinity ◽  
Sympatric Species ◽  
Otolith Chemistry ◽  
Closely Related Species ◽  
Lower Salinity ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Specific Variation

ABSTRACT Two sympatric species of marine mullets, Mugil curema and M. liza, use the rio Tramandaí Estuary as nursing grounds. When two closely related species are sympatric, various mechanisms may permit their coexistence, including spatial or temporal segregation that results in the divergent use of the resources for which they compete. To investigate the spatial segregation, we used otolith chemistry inferred through laser ablation-inductively coupled plasma mass spectrometry. Our results indicate that in the rio Tramandaí Estuary, M. curema is associated with high salinity waters and can be classified as a Marine Migrant in the Marine Estuarine-opportunist subcategory. Mugil liza is associated with lower salinity and can be classified as a Marine Migrant in the Estuarine Dependent subcategory. The intra-specific variation in estuarine habitat use indicates that the migratory behaviors in mullets are far more complex than previously known.

scholarly journals The influence of oceanic and lagoonal plume waters on otolith chemistry

2004 ◽  
Vol 61 (6) ◽  
pp. 898-904 ◽  
Author(s):  
Heather M Patterson ◽  
Michael J Kingsford ◽  
Malcolm T McCulloch
Keyword(s):  
Inductively Coupled Plasma ◽  
High Spatial Resolution ◽  
Spatial Scales ◽  
Water Masses ◽  
Otolith Chemistry ◽  
Confounding Factors ◽  
Phytoplankton Blooms ◽  
Elemental Ratios ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry

To determine how ocean and lagoonal plume waters from within the same reef were reflected in the chemical composition of otoliths, we conducted an experiment over three consecutive summers where conditions of temperature and food were held constant. Presettlement Pomacentrus coelestis were held in replicate tanks of the two water masses for 9 days. The sagittae were then analyzed at high spatial resolution (5 µm × 50 µm × 4 µm) using laser ablation inductively coupled plasma mass spectrometry. Ba/Ca and Sr/Ca varied between water masses and the rank of these elemental ratios changed among years. Although the reason for this change in rank is not known, likely mechanisms include upwelling and (or) the episodic appearance of phytoplankton blooms inside the lagoon. This is the first demonstration that the elemental signatures of otoliths can vary significantly over small spatial scales in reef systems in the absence of confounding factors, thus complicating studies attempting to discriminate reef-based stocks or elucidate natal origins using otolith chemistry.

A multi-faceted approach for quantifying the estuarine - nearshore transition in the life cycle of the bull shark, Carcharhinus leucas

2011 ◽  
Vol 62 (12) ◽  
pp. 1421 ◽  
Author(s):  
J. M. Werry ◽  
S. Y. Lee ◽  
N. M. Otway ◽  
Y. Hu ◽  
W. Sumpton
Keyword(s):  
Habitat Use ◽  
Acoustic Telemetry ◽  
Inductively Coupled Plasma ◽  
Stomach Contents ◽  
Inductively Coupled ◽  
Carcharhinus Leucas ◽  
Bull Shark ◽  
Plasma Mass Spectrometry ◽  
Shark Attacks ◽  
Δ15n And Δ13c

Understanding the ontogenetic habitat linkages of sharks is important for conservation and managing human interactions. We used acoustic telemetry, catch data, elemental and stable isotope signatures and dietary analyses to investigate ontogenetic habitat use in south-east Queensland, Australia, by the bull shark Carcharhinus leucas, a IUCN ‘near-threatened’ species that is implicated in many shark attacks on humans in urban estuaries. Sequential analyses for δ15N and δ13C of vertebrae from five adult C. leucas and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS) for elemental composition from 23 C. leucas, including a pregnant female, were also used to trace ontogenetic habitat dependence. Acoustic telemetry indicated large juvenile and subadult C. leucas remained in estuarine habitats. δ15N values across shark vertebrae showed an ontogenetic shift in diet with total length (TL), confirmed by stomach contents. LA-ICPMS data reflected the ontogenetic movements of C. leucas from natal habitats. Differences among adults were gender related. Shifts in habitat use by subadults were correlated with a sigmoidal δ13C relationship with TL. C. leucas have a multipartite, stage-specific dependency in their transition between habitats along the freshwater–estuarine–marine continuum, making them particularly susceptible to the habitat alteration that is occurring globally.

scholarly journals Combined effects of extrinsic and intrinsic factors on otolith chemistry: implications for environmental reconstructions

2013 ◽  
Vol 70 (8) ◽  
pp. 1159-1166 ◽  
Author(s):  
Thomas C. Barnes ◽  
Bronwyn M. Gillanders
Keyword(s):  
Inductively Coupled Plasma ◽  
Interactive Effect ◽  
Otolith Chemistry ◽  
Intrinsic Factors ◽  
Inductively Coupled ◽  
Complex Interactions ◽  
In Captivity ◽  
Trace Elemental ◽  
Plasma Mass Spectrometry ◽  
Extrinsic And Intrinsic Factors

Otolith chemistry is widely used to understand patterns of fish movement and habitat use, with significant progress made in understanding the influence of environmental factors on otolith elemental uptake. However, few studies consider the interactive effect that environmental and genetic influences have on otolith chemistry. This study assessed the influence of salinity, temperature, and genetics on the incorporation of three key elements (strontium (Sr), barium (Ba), and magnesium (Mg)) into the otoliths of two discrete stocks of mulloway (Argyrosomus japonicus) fingerlings reared in captivity. Elemental analysis via laser ablation inductively coupled – plasma mass spectrometry found that stock (genetics) had a significant interactive effect on otolith Sr:Ca (salinity × temperature × stock) and Ba:Ca (salinity × stock), but did not affect Mg:Ca incorporation. Mg:Ca showed a positive relationship with temperature for both stocks. The incorporation of some elements into the otoliths of fish is the result of complex interactions between extrinsic and intrinsic factors. These findings highlight the necessity to also consider stock along with environmental variables when using trace elemental signatures to reconstruct the environmental histories of fish.

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