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Life history variation for A subtropical cutlassfish
Spatial variation in con-specific growth rates implies differential population dynamics and likely distinct population structures. Here, we investigate growth variation for the exploited cutlassfish Trichiurus japonicus between two coasts of Taiwan (lat 22.5-25°N). Although variation in environmental conditions between the two coasts was subtle, we found significant differences in demographic structure and male growth rates of cutlassfish. The data suggest that the population that displays a slower growth rate may experience higher mortality, a pattern consistent with fishing-induced evolution on growth (Wang and Heino 2018).
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Variation in offspring size and numberLife history theory predicts that females should adjust sizes and number of offspring to maximize offspring survival probability based on environmental conditions. Subtropical fish tend to spawn in various seasons. We hypothesize that offspring (egg) size and number change among different seasons. We conduct a field experiment to evaluate this hypothesis based on cutlassfish Trichiurus japonicus between two coasts of Taiwan (Chen et al. 2020).
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TEMPERATURE effects on EARLY LIFE HISTORIES FOR REEF FISHES
Temperature affects species’ population dynamics, but its differential impacts on species early life histories remains understudied. To elucidate temperature effects on the early-life growth among species, we investigate variation in the pelagic larval duration, larval growth rates, and settlement lengths among species and latitudes. These data will advance understanding of range shifts and recruitment for reef fish populations upon warming.
We use a combination of a field study and meta-analysis to carry out our study: a field study allows evaluating the temperature effects on larval traits using in-situ temperature measurements. Moreover, the meta-analysis provides a global assessment of multiple larval traits for a large number of species under rising temperature. |
Reef fish species identification Measuring length and weight
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