Do age-related changes in feeding habits of brown trout alter structural properties of food webs?

Sánchez‐Hernández, Javier

doi:10.1007/s10452-016-9586-z

Cited by 11 publications

(11 citation statements)

References 42 publications

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“…the number of feeding linkages) as different functional groups occupy alternative positions (i.e. alternative stable states) in the food web (Amundsen et al, ; Takimoto, ; Nakazawa, , ; van Leeuwen et al, ; Sánchez‐Hernández, ). However, it may not be possible to identify alternative positions in food webs clearly when predators undergo multiple ODSs (i.e.…”

Section: Consequencesmentioning

confidence: 99%

“…respiration and primary productivity). Network-based approaches have demonstrated that the functional role of fish is developmental-stage specific (Ramos-Jiliberto et al, 2011;Sánchez-Hernández, 2016). ODSs, therefore, have the potential to have important effects on energy pathways and food-web structure and dynamics (Woodward et al, 2005;Miller & Rudolf, 2011;Nakazawa, 2015).…”

Section: (2) Food Webs and Ecosystem Processesmentioning

confidence: 99%

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

et al. 2018

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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.

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Section: Consequencesmentioning

confidence: 99%

Section: (2) Food Webs and Ecosystem Processesmentioning

confidence: 99%

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

et al. 2018

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“…Brown trout is one of the most widespread salmonid fish species in European inland waters and its natural distribution is fundamentally restricted to this area (Elliott, ), although it has been introduced to many countries worldwide (Elliott, ). Moreover, brown trout is of great importance from an ecological and socio‐economic point of view, as it is the top‐predator fish in many river systems (Jensen et al., ; Sánchez‐Hernández, ) and one of the most popular and important sport‐fishing species (Almodovar & Nicola, ). The ecology of brown trout has been studied for many years (Elliott, ; Jonsson & Jonsson, ) and several studies on population dynamics have been conducted in different regions (Bagliniére, Maisse, Lebail, & Nihouarn, ; Elliott, ; Lobón‐Cerviá, ; Mortensen, ).…”

Section: Introductionmentioning

confidence: 99%

“…mortality rates, survival rates) and, therefore, it is very difficult to understand how different population traits interact with river connectivity to generate the observed spatial patterns. In this regard, building population dynamics models of river species at a river network scale is a promising approach to better understand how the effects of altered connectivity might propagate through a river network (Charles, Bravo importance from an ecological and socio-economic point of view, as it is the top-predator fish in many river systems (Jensen et al, 2008;Sánchez-Hernández, 2016) and one of the most popular and important sport-fishing species (Almodovar & Nicola, 1998). The ecology of brown trout has been studied for many years (Elliott, 1994;Jonsson & Jonsson, 2011) and several studies on population dynamics have been conducted in different regions (Bagliniére, Maisse, Lebail, & Nihouarn, 1989;Elliott, 1994;Lobón-Cerviá, 2012;Mortensen, 1977).…”

Section: Introductionmentioning

confidence: 99%

Effects of altered river network connectivity on the distribution of Salmo trutta: Insights from a metapopulation model

et al. 2019

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Network connectivity is a key feature of rivers that affects patterns and processes in lotic ecosystems. Few studies have considered how changes in river reach connectivity might affect ecosystem attributes at a whole river network scale. The use of population dynamics models of keystone species at a river network scale allows exploration of how the effects of altered natural connectivity patterns might propagate through a river network. In this study, we present a metapopulation model to estimate the spatial distribution of the population density of brown trout (Salmo trutta), an ecologically and socioeconomically important top predator, in a river network in northern Spain. The model accounts for the presence of barriers that limit longitudinal connectivity in upstream and downstream directions. The model estimates the spatial distribution of densities of three age‐classes (young‐of‐the‐year, juveniles, and adults) in all river reaches that make up the network based on topology, connectivity and population dynamics (e.g. age‐class specific mortality, spawning, age‐class dispersal, and spawning migration patterns). Seventy‐five percent of the modelled population densities fell within the 95% confidence intervals of the empirical data (84.6% for young‐of‐the‐year, 69.2% for juveniles, and 69.2% for adults) collected in 13 reaches. The simulated removal of all longitudinal barriers to migration in the river network (re‐naturalisation of the whole catchment) produced a modelled increase in brown trout density in the most downstream reaches of the river network and lowered fish densities in the upstream portion of the network when bias in juvenile and adult movement direction was assumed. Furthermore, the simulated removal of a single obstacle affected fish density even in distant tributaries. The proposed model is an appropriate tool for the evaluation of spatial patterns of brown trout density at a river network scale and for the assessment of the impact of altered connectivity. This might help simulate the results of management strategies regarding river connectivity and show where population decreases or increases could be expected, although empirical knowledge of overall trout movement in the studied river networks is required for drawing realistic scenarios.

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“…Except for S. trutta, the Tormes ichthyofauna is composed of endemic species. S. trutta is the main top predator (Sánchez-Hernández, 2016).…”

Section: Methodsmentioning

confidence: 99%

Lernaea cyprinacea (Crustacea: Copepoda) in the Iberian Peninsula: climate implications on host–parasite interactions

Sánchez‐Hernández

2017

Knowl. Manag. Aquat. Ecosyst.

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-The non-native parasitic anchor worm (Lernaea cyprinacea) may induce anaemia, malformations, reduced growth and increased susceptibility to secondary infection to its hosts. The objectives of this study were to (i) compile a list of the host species of L. cyprinacea in the Iberian Peninsula and (ii) assess if climate may impact on infestation levels of the parasite. There were two primary sources for data collection: (i) fish sampling in the Tormes Basin (Ávila, central Spain) during August 2010 and 2016 and (ii) data retrieved from publications containing relevant information about L. cyprinacea. Eleven temperature variables were obtained from Worldclim. Next, the relationship between infestation levels of the anchor worm (prevalence, intensity and abundance) and temperature was tested using mixed models. Fifteen cyprinids species among 18 species are host of L. cyprinacea in the Iberian Peninsula. Infestation levels of the anchor worm are highly connected to temperature. Finally, the possible implications of global warming for host-parasite interactions are discussed.Keywords: alien species / ectoparasite / fish host / global warming / mixed models Résumé -Lernaea cyprinacea (Crustacea: Copepoda) dans la péninsule ibérique : implications climatiques sur les interactions hôte-parasite. Le copépode parasite (Lernaea cyprinacea) non indigène peut induire une anémie, des malformations, une croissance réduite et une sensibilité accrue à une infection secondaire de ses hôtes. Les objectifs de cette étude étaient de (i) dresser une liste des espèces hôtes de L. cyprinacea dans la péninsule ibérique et (ii) évaluer si le climat peut avoir un impact sur les niveaux d'infestation du parasite. Il y avait deux sources principales de collecte de données : (i) l'échantillonnage des poissons dans le bassin de Tormes (Ávila, centre de l'Espagne) en août 2010 et 2016, et (ii) des données provenant de publications contenant des informations pertinentes sur L. cyprinacea. Onze variables de température ont été obtenues auprès de Worldclim. Ensuite, la relation entre les niveaux d'infestation du copépode (prévalence, intensité et abondance) et la température a été testée en utilisant des modèles mixtes. Quinze cyprinidés parmi dix-huit espèces sont hôtes de L. cyprinacea dans la péninsule ibérique. Les niveaux d'infestation de la lernée sont fortement liés à la température. Enfin, les implications possibles du réchauffement climatique pour les interactions hôte-parasite sont discutées.

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Do age-related changes in feeding habits of brown trout alter structural properties of food webs?

Cited by 11 publications

References 42 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

Effects of altered river network connectivity on the distribution of Salmo trutta: Insights from a metapopulation model

Lernaea cyprinacea (Crustacea: Copepoda) in the Iberian Peninsula: climate implications on host–parasite interactions

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