Diel and seasonal changes in nutritional condition of the anadromous twaite shad <i>Alosa fallax fallax</i> (Lacépède, 1803) larvae

Esteves, Eduardo; Pina, Teresa Casas; Andrade, J.P.

doi:10.1111/j.1600-0633.2008.00332.x

Cited by 4 publications

(4 citation statements)

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“…Diel patterns in our study were only recorded when data between species was pooled perhaps due a too small sample size given the intraspecific variation. In general, there is a clear response of RNA/DNA ratio to diel physiological fluctuations [30] as described for other species such as molluscs [23] and fish [22]. In our study, both species showed a winter pattern of lowest RNA/DNA ratio at noon and highest at midnight, while summer patterns were more variable, with highest RNA/DNA ratio in the day time, possibly since physico-chemical factors showed stronger diel fluctuations in summer then winter.…”

Section: Discussionsupporting

confidence: 73%

“…Previous work suggests that diel cycles are set by the availability of demersal planktonic food [17], [18] and alternate sources of nitrogen [19] with high concentration of zooplankton and possible highest feeding rates during night [20], [21]. Diel variations in RNA/DNA ratios have been observed for fish and molluscs [22], [23] due to diel fluctuations in metabolic rates, food requirements and digestion times [24]. However, to our knowledge no study so far has investigated diel patterns in RNA/DNA ratio and protein concentration, or investigated which physico-chemical factors might be responsible for these changes.…”

Section: Introductionmentioning

confidence: 99%

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Temporal Variations in Metabolic and Autotrophic Indices for Acropora digitifera and Acropora spicifera – Implications for Monitoring Projects

2013

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Coral health indices are important components of the management assessments of coral reefs, providing insight into local variation in reef condition, as well as tools for comparisons between reefs and across various time scales. Understanding how such health indices vary in space and time is critical to their successful implementation as management tools. Here we compare autotrophic and heterotrophic coral health indices, examining specifically the temporal variation driven by the local environmental variation, at three scales (diel, daily and seasonal). We compared metabolic indices (RNA/DNA ratio, protein concentration) and autotrophic indices (Chlorophyll a (Chl a), zooxanthellae density, effective quantum yield (yield) and relative electron transport rate (rETR)) for two dominant Acropora species, A. digitifera and A. spicifera at Ningaloo Reef (north-western Australia) in August 2010 (austral winter) and February 2011 (austral summer). Clear seasonal patterns were documented for metabolic indices, zooxanthellae density and rETR, while cyclic diel patterns only occurred for yield and rETR, and RNA/DNA ratio. Significant daily variation was observed for RNA/DNA ratio, Chl a concentration, yield and rETR. Results suggest that zooxanthellae density and protein concentrations are good long-term indicators of coral health whose variance is largely seasonal, while RNA/DNA ratio and rETR can be used for both long-term (seasonal) and short-term (diel) coral monitoring. Chl a can be used to describe changes between days and yield for both diel and daily variations. Correlations between health indices and light history showed that short-term changes in irradiance had the strongest impact on all health indices except zooxanthellae density for A. digitifera; for A. spicifera no correlation was observed at all. However, cumulative irradiance over the several days before sampling showed significant correlations with most health indices suggesting that a time-lag effect has to be taken into account when interpreting diel variations in coral condition.

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Section: Discussionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Temporal Variations in Metabolic and Autotrophic Indices for Acropora digitifera and Acropora spicifera – Implications for Monitoring Projects

2013

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“…The recent human derived changes have altered water thermal and haline regimens and consequently the estuary production and food availability patterns as a result of river flow regulation (Morais et al, 2009). These changes in water parameters could have significant effects on anadromous species effective recruitment as suggested by Esteves et al (2009) and supported by current results. To improve the condition of nursery habitats, ecological flows should be implemented in order to achieve a balance between leading environmental factors, such as temperature and salinity, and enhance A. fallax recruitment (Chícharo et al, 2006).…”

Section: Discussionsupporting

confidence: 53%

“…As the spawning season progresses (from March to June) later larvae cohorts may benefit from increasing water temperature. From RNA/DNA ratios, Esteves et al (2009) found that metabolic activity is potentiated by the higher temperatures to which A. fallax larvae are exposed later in the spawning season, which also potentiate general ecosystem productivity providing larvae with a higher abundance of resources (Crecco and Savoy, 1985). In contrast, Esteves and Andrade (2012) observed that the highest growth rates for A. fallax larvae occurred early in the spawning season, suggesting that maybe only the fastest growing larvae survive during this period.…”

Section: Discussionmentioning

confidence: 99%

Effects of temperature, salinity and feeding frequency on growth and mortality of twaite shad (Alosa fallax) larvae

Navarro

Carrapato

Ribeiro

2014

Knowl. Managt. Aquatic Ecosyst.

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Key-words:clupeidae, anadromous, twaite shad, stocking, rearing Available knowledge on the ecological requirements of the twaite shad Alosa fallax larvae is limited, restricting the development of effective management and conservation measures for this anadromous clupeid in European rivers. In this study, the effects of water temperature, salinity and feeding frequency on A. fallax larval growth and mortality were evaluated. For a period of ten days after the onset of exogenous feeding, A. fallax larvae exhibited higher survival rates when subjected to salinities of 2.5 g·L −1 and 5 g·L −1 , from trials conducted at 0 g·L −1 , 2.5 g·L −1 , 5 g·L −1 , 10 g·L −1 , 15 g·L −1 , 20 g·L −1 . Higher food availability resulted in higher larval growth and survival rates during this period. Water temperature effects on larvae growth and survival was evaluated for a period of three months after hatching. Alosa fallax larvae exhibited higher growth and survival rates when subjected to temperatures of 24• C and 28• C, in contrast to trials conducted at 20• C. These results are compared to other Alosa spp. and considerations on conservation measures are discussed in light of the results. RÉSUMÉEffets de la température, la salinité et la fréquence d'alimentation sur la croissance et la mortalité des larves d'alose feinte (Alosa fallax)

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Quantitative methods for analysing cumulative effects on fish migration success: a review

Johnson¹,

Patterson²,

Martins³

et al. 2012

Journal of Fish Biology

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It is often recognized, but seldom addressed, that a quantitative assessment of the cumulative effects, both additive and non-additive, of multiple stressors on fish survival would provide a more realistic representation of the factors that influence fish migration. This review presents a compilation of analytical methods applied to a well-studied fish migration, a more general review of quantitative multivariable methods, and a synthesis on how to apply new analytical techniques in fish migration studies. A compilation of adult migration papers from Fraser River sockeye salmon Oncorhynchus nerka revealed a limited number of multivariable methods being applied and the sub-optimal reliance on univariable methods for multivariable problems. The literature review of fisheries science, general biology and medicine identified a large number of alternative methods for dealing with cumulative effects, with a limited number of techniques being used in fish migration studies. An evaluation of the different methods revealed that certain classes of multivariable analyses will probably prove useful in future assessments of cumulative effects on fish migration. This overview and evaluation of quantitative methods gathered from the disparate fields should serve as a primer for anyone seeking to quantify cumulative effects on fish migration survival.

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Diel and seasonal changes in nutritional condition of the anadromous twaite shad Alosa fallax fallax (Lacépède, 1803) larvae

Cited by 4 publications

References 48 publications

Temporal Variations in Metabolic and Autotrophic Indices for Acropora digitifera and Acropora spicifera – Implications for Monitoring Projects

Temporal Variations in Metabolic and Autotrophic Indices for Acropora digitifera and Acropora spicifera – Implications for Monitoring Projects

Effects of temperature, salinity and feeding frequency on growth and mortality of twaite shad (Alosa fallax) larvae

Quantitative methods for analysing cumulative effects on fish migration success: a review

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