Long-distance navigation and magnetoreception in migratory animals

Nature, Journal Year: 2018, Volume and Issue: 558(7708), P. 50 - 59

Published: May 25, 2018

Language: Английский

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Anadromy, potamodromy and residency in brown trout Salmo trutta: the role of genes and the environment

Journal of Fish Biology, Journal Year: 2019, Volume and Issue: 95(3), P. 692 - 718

Published: May 10, 2019

Abstract Brown trout Salmo trutta is endemic to Europe, western Asia and north‐western Africa; it a prominent member of freshwater coastal marine fish faunas. The species shows two resident (river‐resident, lake‐resident) three main facultative migratory life histories (downstream–upstream within river system, fluvial–adfluvial potamodromous; from lake, lacustrine–adfluvial (inlet) or allacustrine (outlet) the sea, anadromous). River‐residency v . migration balance between enhanced feeding thus growth advantages particular habitat costs potentially greater mortality energy expenditure. Fluvial–adfluvial usually has less improvement, but risk, than anadromous, latter vary among catchments as which favoured. Indirect evidence suggests that around 50% variability in S. residency, individuals population, due genetic variance. This dichotomous decision can best be explained by threshold‐trait model quantitative genetics. Thus, an individual's physiological condition ( e.g ., status) regulated environmental factors, genes non‐genetic parental effects, acts cue. magnitude this cue relative genetically predetermined individual threshold, governs whether will migrate sexually mature river‐resident. threshold occurs early and, if choice migrate, second probably follows determining age timing migration. Migration destination (mainstem river, sea) also appears programmed. Decisions ultimate result number subsequent consequential changes such parr–smolt transformation, sexual maturity return Strong associations with one few have been found for most aspects syndrome indirect supports involvement all parts. evolve natural anthropogenic changes, alter survival reproduction. Knowledge determinants various components lags substantially behind Oncorhynchus mykiss other salmonines. Identification markers linked especially migration–residency decision, prerequisite facilitating detailed empirical studies. In order predict effectively, through modelling, effects quantification fitness different traits their heritabilities, across range conditions, urgently required face increasing pace changes.

Language: Английский

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Fidelity to foraging sites after long migrations

Journal of Animal Ecology, Journal Year: 2019, Volume and Issue: 89(4), P. 1008 - 1016

Published: Dec. 2, 2019

Patterns of animal movement associated with foraging lie at the heart many ecological studies and often animals face decisions staying in an environment they know versus relocating to new sites. The lack knowledge sites means there is risk a decision relocate (e.g. poor foraging) as well potential benefit improved foraging). Using unique long-term satellite tracking dataset for several sea turtle species, combined capture-mark-recapture data extending over 50 years, we show how, across individuals generally maintain tight fidelity specific after extended (up almost 10,000 km) migration from distant breeding decades. Migrating travelled through suitable areas en route their 'home' site so journeys fidelity. We explore likely mechanistic underpinnings this trait, which also seen some migrating birds, suggest that will forgo forage encountered during when have suitability those sites, making relocation risky.

Language: Английский

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The movement ecology of fishes

Journal of Fish Biology, Journal Year: 2022, Volume and Issue: 101(4), P. 756 - 779

Published: July 5, 2022

Abstract Movement of fishes in the aquatic realm is fundamental to their ecology and survival. can be driven by a variety biological, physiological environmental factors occurring across all spatial temporal scales. The intrinsic capacity movement impact fish individually ( e.g. , foraging) with potential knock‐on effects throughout ecosystem food web dynamics) has garnered considerable interest field ecology. advancement technology recent decades, combination ever‐growing threats freshwater marine systems, further spurred empirical research theoretical considerations. Given rapid expansion within its significant role informing management conservation efforts, contemporary multidisciplinary review about various components influencing outstanding. Using an established conceptual framework for as guide i.e. Nathan et al. 2008: 19052), we synthesized individual that affect fishes. Specifically, internal energy acquisition, endocrinology, homeostasis) external (biotic abiotic) elements are discussed, well different processes influence individual‐level (or population) decisions, such navigation cues, motion capacity, propagation characteristics group behaviours. In addition drivers factors, also explored how associated strategies help survival optimizing other biological states. Next, identified increasingly being incorporated into highlighting inherent benefits spatio‐temporal behaviour imbues policy, regulatory, remediation planning. Finally, considered future evaluating ongoing technological innovations both challenges opportunities these advancements create scientists managers. As ecosystems continue face alarming climate (and human‐driven) issues animal movements, comprehensive assessment will instrumental developing plans promote sustainability measures resources.

Language: Английский

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Two‐current choice flumes for testing avoidance and preference in aquatic animals

Methods in Ecology and Evolution, Journal Year: 2016, Volume and Issue: 8(3), P. 379 - 390

Published: Oct. 13, 2016

Summary Aquatic chemical ecology is an important and growing field of research that involves understanding how organisms perceive respond to cues in their environment. Research assessing the preference or avoidance a water source containing specific has increased popularity recent years, variety methods have been described scientific literature. Two‐current choice flumes seen greatest increase popularity, perhaps because potential address broadest range questions. Here, we review literature on two‐current show there clear absence standardized methodologies make comparisons across studies difficult. Some main issues include turbulent flows cause mixing cues, inappropriate size arenas for animals, short experiments with stressed failure report experiment researcher biases were eliminated, general underreporting methodological details, underutilization collected data analyses. In this review, present best practice guidelines build, test use measure behavioural responses aquatic animals provide blueprints flume construction. The steps can be taken avoid problems commonly encountered when using analysing resulting data. This provides set standards should followed ensure quality, transparency replicability future field.

Language: Английский

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Eight Decades of Hatchery Salmon Releases in the California Central Valley: Factors Influencing Straying and Resilience

Fisheries, Journal Year: 2019, Volume and Issue: 44(9), P. 433 - 444

Published: April 3, 2019

Abstract The California Central Valley contains the southernmost native populations of Chinook Salmon Oncorhynchus tshawytscha, which inhabit a highly variable, anthropogenically altered environment. To mitigate habitat loss and support fisheries, millions fall-run hatchery salmon are released each year, often transported downstream to avoid in-river mortality, with consequences not fully understood. We synthesize historical trends in release location timing (1941–2017), focusing on outcomes influencing stock resilience, adult straying, ocean arrival timing. Over time, juveniles have been increasing distances from source hatchery, particularly during droughts. Transport distance was strongly associated straying rate (averaging 0–9% vs. 7–89% for site bay upstream Golden Gate Bridge, respectively), effects releases natural spawners. Decreasing variation could reduce spatiotemporal buffering, narrowing timings risk mismatch peak prey production. epitomize pervasive challenge balancing short-term (e.g., abundance) against long-term stability) goals.

Language: Английский

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Life‐history strategies in salmonids: the role of physiology and its consequences

Biological reviews/Biological reviews of the Cambridge Philosophical Society, Journal Year: 2021, Volume and Issue: 96(5), P. 2304 - 2320

Published: May 27, 2021

ABSTRACT Salmonids are some of the most widely studied species fish worldwide. They span freshwater rivers and lakes to fjords oceans; they include short‐ long‐distance anadromous migrants, as well partially migratory non‐migratory populations; exhibit both semelparous iteroparous reproduction. Salmonid life‐history strategies represent diverse on planet. For this reason, salmonids provide an especially interesting model study drivers these different pathways. Over past few decades, numerous studies reviews have been published, although focused ultimate considerations where expected reproductive success developmental or compared. Those that considered proximate causes generally genetics environment, with less consideration physiology. Our objective was therefore review existing literature role physiology a driver for in salmonids. This link is necessary explore since at core biological processes influencing energy acquisition allocation. Energy allocation processes, turn, can affect life histories. We find driven by range physiological ranging from metabolism nutritional status endocrinology. revealed vary across individuals depending decision(s) be made. In addition, while findings sometimes species, results appear consistent similar cycles. conclude despite much work having conducted topic, its determining remains somewhat unexplored, particularly char trout (excluding brown trout) species. Understanding mechanistic links if we understand adequately how changing environments will impact salmonid populations.

Language: Английский

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An update on anatomy and function of the teleost olfactory system

PeerJ, Journal Year: 2019, Volume and Issue: 7, P. e7808 - e7808

Published: Sept. 27, 2019

About half of all extant vertebrates are teleost fishes. Although our knowledge about anatomy and function their olfactory systems still lags behind that mammals, recent advances in cellular molecular biology have provided us with a wealth novel information the sense smell this important animal group. Its paired organs contain up to five types receptor neurons expressing OR, TAAR, VR1- VR2-class odorant receptors associated individual transduction machineries. The different preferentially tuned towards particular classes odorants, specific behaviors, such as feeding, mating or migration. We discuss connections bulb, differences bulbar circuitry compared characteristics second order projections telencephalic areas, considering everted ontogeny telencephalon. review concludes brief overview current theories odor coding prominent neural oscillations observed system.

Language: Английский

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Causes and Consequences of Straying into Small Populations of Pacific Salmon

Fisheries, Journal Year: 2017, Volume and Issue: 42(4), P. 220 - 230

Published: March 27, 2017

Most Pacific salmon Oncorhynchus spp. migrate to their natal sites spawn. Some, however, stray into nonnatal habitats and interact (e.g., reproduce) with individuals from other populations. straying has been heavily studied for several decades, particularly the perspective of populations that donate migrants. Conservation consequences are experienced primarily by receive strays, though, there is recent evidence significant levels genetic introgression in small recipient populations, which could contribute loss local adaptations. Straying may also provide benefit a demographic rescue effect save declining extirpation. We highlight influence population abundances on magnitude demonstrate this using we collected Sockeye Salmon O. nerka British Columbia, Canada. review potential factors might promote higher donor rates therefore straying. Evidence affect limited identify knowledge gaps, as well anthropogenic activities encourage further discussion research effects rates.

Language: Английский

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Excreted Steroids in Vertebrate Social Communication

Journal of Neuroscience, Journal Year: 2018, Volume and Issue: 38(14), P. 3377 - 3387

Published: March 8, 2018

Steroids play vital roles in animal physiology across species, and the production of specific steroids is associated with particular internal biological functions. The functions are, most cases, quite clear. However, an important feature many (their chemical stability) allows these molecules to secondary, external as messengers after their excretion via urine, feces, or other shed substances. presence excretions has long been appreciated, but capacity serve chemosignals not received much attention. In theory, blend excreted by contains a readout its own state. Initial mechanistic evidence for steroid chemosensation arose from studies species fish. sea lampreys ray-finned fishes, bile salts were identified potent olfactory cues later found pheromones. Recently, we others have discovered that neurons amphibian mammalian systems are also highly sensitive glucocorticoids, sex steroids, acids, some confirmed Steroid systems, unlike detection tissues, performed plasma membrane receptors, details remain largely unclear. this review, present broad view vertebrate focusing on recent research amphibians, mammals. We review hypothesized mechanisms each group discuss potential impacts social communication.

Language: Английский

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