Physiology, endocrinology and chemical communication in aggressive behaviour of fishes

Journal of Fish Biology, Год журнала: 2021, Номер 98(5), С. 1217 - 1233

Опубликована: Янв. 10, 2021

Fishes show remarkably diverse aggressive behaviour. Aggression is expressed to secure resources; adjusting aggression levels according context key avoid negative consequences for fitness and survival. Nonetheless, despite its importance, the physiological basis of in fishes still poorly understood. Several reports suggest hormonal modulation aggression, particularly by androgens, but contradictory studies have been published. Studies exploring role chemical communication behaviour are also scant, pheromones involved remain be unequivocally characterized. This surprising as most ancient form information exchange plays a variety other roles fishes. Furthermore, study relevant at evolutionary, ecological economic levels. A few pioneering support hypothesis that behaviour, least some teleosts, modulated "dominance pheromones" reflect social status sender, there little on identity compounds involved. review aims provide global view underlying mechanisms including involvement communication, discusses potential use dominance improve fish welfare. Methodological considerations future research directions outlined.

Язык: Английский

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Restricted dispersal in a sea of gene flow

Proceedings of the Royal Society B Biological Sciences, Год журнала: 2021, Номер 288(1951), С. 20210458 - 20210458

Опубликована: Май 18, 2021

How far do marine larvae disperse in the ocean? Decades of population genetic studies have revealed generally low levels structure at large spatial scales (hundreds kilometres). Yet this result, typically based on discrete sampling designs, does not necessarily imply extensive dispersal. Here, we adopt a continuous strategy along 950 km coast northwestern Mediterranean Sea to address question four species. In line with expectations, observe weak scale. Nevertheless, our uncovers pattern isolation by distance small (few tens kilometres) two Individual-based simulations indicate that signal is an expected signature restricted At other extreme connectivity spectrum, pairs individuals are closely related genetically were found more than 290 apart, indicating long-distance Such combination dispersal rare events supported high-resolution biophysical model larval study area, and posit it may be common Our results bridge direct implications for design reserve networks.

Язык: Английский

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Long distance dispersal with kinship in the Yangtze River during early life stage of a freshwater fish

Water Biology and Security, Год журнала: 2025, Номер unknown, С. 100367 - 100367

Опубликована: Янв. 1, 2025

Язык: Английский

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The Role of Wind on the Simulated Dispersal and Recruitment of a Commercially Important Hawaiʻi Bottomfish

Fisheries Oceanography, Год журнала: 2025, Номер unknown

Опубликована: Фев. 18, 2025

ABSTRACT Variability in larval transport has long been hypothesized to drive recruitment fluctuations fishes, yet evidence for these hypotheses is often lacking. Further, the origins of many come from temperate subpolar regions, leaving such questions largely underexplored other especially tropics. To assess drivers a tropical archipelago, we simulated dispersal culturally and commercially important bottomfish, uku ( Aprion virescens ), Penguin Bank, its most prominent spawning location main Hawaiian islands. We used Lagrangian particle tracking models forced by regional ocean model degree interisland potential connectivity this interannual variability across 13 years 2008 2020. Simulated larvae released Bank primarily reached Maui Nui Oʻahu, nearest settlement areas, with lower more distant regions. Interannual overall number connections was pronounced linked both local wind speed direction, increased loss occurring during higher speeds northerly winds. Recruitment deviations stock assessment showed similar pattern, estimates significantly decreasing strong Our results provide evidence, derived simulation integrating ecological physical components, patterns contributing socioeconomically species sensitivity forcing. Understanding how will change warming climate may be essential understanding coming years.

Язык: Английский

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In situ estimation of active dispersal abilities in reef fish early life stages using tracking technologies

Methods in Ecology and Evolution, Год журнала: 2025, Номер unknown

Опубликована: Март 14, 2025

Abstract Most reef fishes possess an early pelagic stage that ensures the crucial role of maintaining connectivity between distant populations, as movements older demersal stages are generally restricted. While classically considered passive, numerous studies show most larvae largely influence dispersion scale and settlement rate by actively swimming horizontally/vertically in oriented way during their phase. Laboratory measurements active dispersal skills differ from natural behaviors individuals observed divers manually annotating depth bearing every 30 s, while carrying a low‐speed flowmeter to estimate average speed. Here, we improved this protocol through use electronic measurement devices achieve enhanced feasibility, replicability, efficiency, safety. Bearing could be precisely measured at high frequencies using logger fixed on optimized diving tray, which allowed us reduce tracking duration 10 5 min, track more individuals. It also permitted studying situ temporal dynamics vertical speed direction changes. All further steps, including data entry, sensor calibration, circular statistics 3D reconstruction (Madwick filter), were automated within interactive pipelines, enabling obtain results 3 h after dives fieldwork. We conducted trackings for diversified set species (32 per ocean) developments Caribbean (Guadeloupe), before being routinely applied Indian Ocean (Maldives) with majority successfully carried out (74%) despite offshore conditions. High individual orientation accuracy, combined great swimming/sinking abilities possibly dependent depth/current, suggests larvae/juveniles can swim correlated random‐walk (CRW). This occurs even when cues too scarce consistent among species/zones emerge (biased CRW), marking difference behavior coastal environment. Although biophysical models ease development informed conservation strategies large spatial scales, comparisons genetic demonstrate only incorporating realistic yield comparable outputs. Our methodological advances overcome various obstacles preventing parameters necessary models, not fishes, but any small organism aquatic habitat.

Язык: Английский

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