Cannibalism among size classes of larvae may be a substantial mortality component in tuna

Reglero, Patricia; Urtizberea, Agurtzane; Torres, A.P.; Alemany, F.; Fiksen, Øyvind

doi:10.3354/meps09187

Cited by 43 publications

(34 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Reglero et al, ; Llopiz, ). It is possible that an early switch to piscivory is connected to water temperature, as higher temperatures tend to promote a higher frequency of piscivory (Reglero et al, ). This was corroborated by Llopiz (), who found that piscivory in the early development of fish was most frequent at lower latitudes, but a mechanistic understanding of how water temperature influences the size‐related timing of ontogenetic switches to piscivory is missing.…”

Section: The Nature Of Odssmentioning

confidence: 99%

Causes and consequences of ontogenetic dietary shifts: a global synthesis using fish models

et al. 2018

View full text Add to dashboard Cite

Ontogenetic dietary shifts (ODSs), the changes in diet utilisation occurring over the life span of an individual consumer, are widespread in the animal kingdom. Understanding ODSs provides fundamental insights into the biological and ecological processes that function at the individual, population and community levels, and is critical for the development and testing of hypotheses around key concepts in trophic theory on model organisms. Here, we synthesise historic and contemporary research on ODSs in fishes, and identify where further research is required. Numerous biotic and abiotic factors can directly or indirectly influence ODSs, but the most influential of these may vary spatially, temporally and interspecifically. Within the constraints imposed by prey availability, we identified competition and predation risk as the major drivers of ODSs in fishes. These drivers do not directly affect the trophic ontogeny of fishes, but may have an indirect effect on diet trajectories through ontogenetic changes in habitat use and concomitant changes in prey availability. The synthesis provides compelling evidence that ODSs can have profound ecological consequences for fish by, for example, enhancing individual growth and lifetime reproductive output or reducing the risk of mortality. ODSs may also influence food‐web dynamics and facilitate the coexistence of sympatric species through resource partitioning, but we currently lack a holistic understanding of the consequences of ODSs for population, community and ecosystem processes and functioning. Studies attempting to address these knowledge gaps have largely focused on theoretical approaches, but empirical research under natural conditions, including phylogenetic and evolutionary considerations, is required to test the concepts. Research focusing on inter‐individual variation in ontogenetic trajectories has also been limited, with the complex relationships between individual behaviour and environmental heterogeneity representing a particularly promising area for future research.

show abstract

Section: The Nature Of Odssmentioning

confidence: 99%

Causes and consequences of ontogenetic dietary shifts: a global synthesis using fish models

et al. 2018

View full text Add to dashboard Cite

show abstract

“…5 E-mail: viktor.j.nilsson@gmail.com intruders (Oyugi et al 2012). Finally, cannibalism, the consumption of conspecifics, and intraguild predation, the killing and consumption of potential competitors, have also been shown to be temperature dependent (Crumrine 2010, Reglero et al 2011. Because these interactions occur between individuals that compete for a shared resource, we will refer to them collectively as competitive interactions.…”

Section: Introductionmentioning

confidence: 99%

Competitive interactions modify the temperature dependence of damselfly growth rates

Nilsson-Örtman

Stoks

Johansson

2014

Ecology

View full text Add to dashboard Cite

Individual growth rates and survival are major determinants of individual fitness, population size structure, and community dynamics. The relationships between growth rate, survival, and temperature may thus be important for predicting biological responses to climate change. Although it is well known that growth rates and survival are affected by competition and predation in addition to temperature, the combined effect of these factors on growth rates, survival, and size structure has rarely been investigated simultaneously in the same ecological system. To address this question, we conducted experiments on the larvae of two species of damselflies and determined the temperature dependence of growth rate, survival, and cohort size structure under three scenarios of increasing ecological complexity: no competition, intraspecific competition, and interspecific competition. In one species, the relationship between growth rate and temperature became steeper in the presence of competitors, whereas that of survival remained unchanged. In the other species, the relationship between growth rate and temperature was unaffected by competitive interactions, but survival was greatly reduced at high temperatures in the presence of interspecific competitors. The combined effect of competitive interactions and temperature on cohort size structure differed from the effects of these factors in isolation. Together, these findings suggest that it will be challenging to scale up information from single-species laboratory studies to the population and community level.

show abstract

“…Although it is generally thought that cannibalism may be one of the main sources of feeding success at early life stages of bluefin (Reglero et al 2011(Reglero et al , 2014, stomach content analysis has not been able to verify piscivory in field-captured ABFT larvae (Catalan et al 2011). By contrast, piscivory in ABFT larvae has been observed in the Gulf of Mexico (Llopiz et al 2010(Llopiz et al , 2014.…”

Section: Introductionmentioning

confidence: 99%

Isotopic discrimination factors and nitrogen turnover rates in reared Atlantic bluefin tuna larvae (<em>Thunnus thynnus</em>): effects of maternal transmission

et al. 2016

View full text Add to dashboard Cite

Summary:The use of stable isotope analysis to study animal diets requires estimates of isotopic turnover rates (half time, t 50 ) and discrimination factors (Δ) for an accurate interpretation of trophic patterns. The stable isotopes of carbon and nitrogen were analysed for eggs and reared larvae of Thunnus thynnus, as well as for the different diets supplied during the experiment. The results showed high values of δ 15 N in eggs and larvae (n=646) until 4 DAH. After this time lapse, the stable isotope values declined progressively until 12 DAH, when notochord flexion began. The δ 13 C showed an inverse trend, suggesting that maternal inheritance of the stable isotopes is evident until pre-flexion stages. This study proposes a model for estimating maternal isotopic signatures of bluefin broodstock. After notochord flexion, larvae were fed with aquaculture-bred gilthead seabream, which resulted in a rapid increase of bluefin larvae δ 15 N values together with a rapid decrease in δ 13 C values. The estimated nitrogen half-time to reach the steady state from the diet was 2.5±0.3 days and the discrimination factor was 0.4±0.3(‰). These results represent the first data set that has allowed isotopic nitrogen turnover rates and discrimination factors of the larval stages of bluefin tuna to be estimated.Keywords: bluefin tuna larvae; stable isotopes; maternal transmission; discrimination factors; nitrogen turnover ratio. Factores de discriminación y tasas de renovación isotópica de nitrógeno en larvas de atún rojo de cultivo (Thunnus thynnus): efectos de la transferencia maternaResumen: El análisis de isótopos estables para estudiar la dieta de los animales requiere estimaciones de las tasas de rotación isotópicas (tiempo medio, t 50 ) y factores de discriminación (Δ) para una correcta interpretación de los patrones tróficos. Los isótopos estables de carbono y nitrógeno se analizaron en los huevos y larvas criadas de Thunnus thynnus, así como para las diferentes dietas suministradas durante el experimento. Los resultados mostraron altos valores de δ 15 N en huevos y larvas (n=646) hasta cuatro días después de eclosionar. Después de este lapso de tiempo, los valores de los isótopos estables disminuyeron progresivamente hasta el día 12, cuando se inició la flexión de la notocorda. El δ 13 C mostró una tendencia inversa, lo que sugiere que la herencia materna de los isótopos estables es evidente en la etapa de pre-flexión. Este estudio propone un modelo para estimar las firmas isotópicas maternas de reproductores de atún rojo. Después de la flexión de la notocorda, las larvas se alimentaron con larvas recién eclosionadas de dorada, lo que dio lugar a un rápido aumento de los valores de δ 15 N en las larvas de atún rojo, junto con una rápida disminución del δ 13 C. El tiempo medio de nitrógeno para alcanzar el equilibrio con la dieta fue de 2,5±0,3 días y el factor de discriminación fue de 0,4±0,3(‰). Estos resultados representan el primer conjunto de datos que permitió la estimación de la tasa de renovación isotópica de nit...

show abstract

Cannibalism among size classes of larvae may be a substantial mortality component in tuna

Cited by 43 publications

References 53 publications

Causes and consequences of ontogenetic dietary shifts: a global synthesis using fish models

Causes and consequences of ontogenetic dietary shifts: a global synthesis using fish models

Competitive interactions modify the temperature dependence of damselfly growth rates

Isotopic discrimination factors and nitrogen turnover rates in reared Atlantic bluefin tuna larvae (<em>Thunnus thynnus</em>): effects of maternal transmission

Contact Info

Product

Resources

About