Percorrer por autor "Hereu, Bernat"
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- Ecological traits, genetic diversity and regional distribution of the macroalga Treptacantha elegans along the Catalan coast (NW Mediterranean Sea)Publication . Medrano, Alba; Hereu, Bernat; Mariani, Simone; Neiva, J.; Pagès-Escolà, Marta; Paulino, Cristina; Rovira, Graciel·la; Serrao, Ester; Linares, CristinaThe widespread decline of canopy-forming macroalgal assemblages has been documented in many regions during the last decades. This pattern is often followed by the replacement of structurally complex algal canopies by more simplified habitats (e.g., turfs or sea urchin barren grounds). Against all odds, the fucoid Treptacantha elegans, a large Mediterranean brown macroalga, broadened its depth range to deeper and exposed environments and displayed an unexpected range expansion along the northern coast of Catalonia over the last two decades. Here, we reconstruct the spread of T. elegans in time and space and unravel ecological and demographic traits such as population dynamics and genetic patterns to provide a comprehensive and integrated view of the current status and geographical expansion for this species. Fast-growing dynamics, early fertile maturity, and high turnover rate are the main competitive advantages that allow the exposed populations of T. elegans to colonize available substrata and maintain dense and patchy populations. We also provided evidence that the deeper and exposed populations of T. elegans constitute a single group across the Catalan coast, with little genetic differentiation among populations. This seems to support the hypothesis of a unique source of spread in the last decades from the Medes Islands No-Take Zone towards both southern and northern waters.
- Marine protected areas promote stability of reef fish communities under climate warmingPublication . Benedetti-Cecchi, Lisandro; Bates, Amanda E.; Strona, Giovanni; Bulleri, Fabio; Horta E Costa, Barbara; Edgar, Graham J.; Hereu, Bernat; Reed, Dan C.; Stuart-Smith, Rick D.; Barrett, Neville S.; Kushner, David J.; Emslie, Michael J.; García-Charton, Jose Antonio; Gonçalves, Emanuel J.; Aspillaga, EnekoProtection from direct human impacts can safeguard marine life, yet ocean warming crosses marine protected area boundaries. Here, we test whether protection offers resilience to marine heatwaves from local to network scales. We examine 71,269 timeseries of population abundances for 2269 reef fish species surveyed in 357 protected versus 747 open sites worldwide. We quantify the stability of reef fish abundance from populations to metacommunities, considering responses of species and functional diversity including thermal affinity of different trophic groups. Overall, protection mitigates adverse effects of marine heatwaves on fish abundance, community stability, asynchronous fluctuations and functional richness. We find that local stability is positively related to distance from centers of high human density only in protected areas. We provide evidence that networks of protected areas have persistent reef fish communities in warming oceans by maintaining large populations and promoting stability at different levels of biological organization. Protected areas are meant to defend species from direct exploitation and habitat loss, but they might also reduce climate change impacts. Here, the authors show that marine protected areas mitigate the impacts of marine heatwaves on reef fish communities.
- Revealing chronotypes across aquatic species using acoustic telemetryPublication . Martorell‐Barceló, Martina; Abecasis, David; Akaarir, Mourad; Alonso‐Fernández, Alexandre; Arlinghaus, Robert; Aspillaga, Eneko; Barcelo‐Serra, Margarida; Brevé, Niels W. P.; Davidsen, Jan G.; Gamundí, Antoni; Grau, Amalia; Hereu, Bernat; Jarić, Ivan; Kapusta, Andrzej; Lowerre‐Barbieri, Sue; Monk, Christopher T.; Nickel, Anja K.; Nicolau, María C.; Ólafsdóttir, Guðbjörg Á.; Olsen. Esben M.; Pickholtz, Renanel; Prchalová, Marie; Reubens, Jan; Říha, Milan; Knaap, Inge van der; Verhelst, Pieterjan; Villegas‐Ríos, David; Alós, JosepAcoustic telemetry offers valuable opportunities to investigate individual variability in circadian-related and other behaviours and how environmental cues shape these patterns in wild fish populations. However, this potential has not yet been fully exploited. We conducted a meta-analysis on 44 datasets from 34 distinct marine and freshwater species and different types of data (acoustic detections, depth, acceleration and positioning). Our aim was to explore the potential of acoustic telemetry in identifying chronotypes as consistent among-individual differences in circadian-related behaviours. First, we applied hidden semi-Markov models to classify individual time series into active and rest states. Subsequently, we computed two classical circadian-related behavioural traits: awakening time (as the activity onset) and rest onset (as the activity offset). Subsequently, we identified distinct phenotypes by decomposing behavioural variation into within- and among-individual components based on repeatability scores. We found evidence of distinct chronotypes in 17 species, with average repeatability scores of 0.52 for awakening time and 0.43 for rest onset, revealing that chronotypes are common in aquatic species. Our findings highlight that both the data type, particularly acceleration sensors, and the number of detections are effective tools for exploring chronotypes. Our study proposes a novel approach to characterising daily activity patterns in aquatic species, predominantly in fishes, and provides guidelines for investigating chronotypes across diverse taxa. We emphasise the promise of biotelemetry and advanced statistical models for improving our understanding of the behaviour of aquatic species and highlight the value of synthesising across large data sets collected in networks of biotelemetryprojects.