A5090385582- Fish Ecology and Management Studies
- Marine and fisheries research
- Marine animal studies overview
- Wildlife Ecology and Conservation
- Genetic and phenotypic traits in livestock
- Genetic diversity and population structure
- Aquatic Invertebrate Ecology and Behavior
- Fish Biology and Ecology Studies
- Morphological variations and asymmetry
- Avian ecology and behavior
- Evolution and Paleontology Studies
- Marine and coastal ecosystems
- Animal Behavior and Reproduction
- Freshwater macroinvertebrate diversity and ecology
- Marine Bivalve and Aquaculture Studies
- Hydrology and Sediment Transport Processes
- Diffusion and Search Dynamics
University of Glasgow
2017-2025
UK Centre for Ecology & Hydrology
2022
Royal College of Physicians and Surgeons of Glasgow
2021
Geometric morphometrics is widely used to quantify morphological variation between biological specimens, but the fundamental influence of operator bias on data reproducibility rarely considered, particularly in studies using photographs live animals taken under field conditions. We examined this four independent operators that applied an identical landmarking scheme replicate 291 Atlantic salmon (Salmo salar L.) from two rivers. Using repeated measures tests, we found significant...
Abstract The migratory behavior of Atlantic salmon ( Salmo salar ) post‐smolts in coastal waters is poorly understood. In this collaborative study, 1914 smolts, from 25 rivers, four countries were tagged with acoustic transmitters during a single seasonal migration. total, 1105 entered the marine study areas and 438 (39.6%) detected on network 414 receivers an autonomous underwater vehicle. Migration pathways (defined as shortest distance between two detections) up to 575 km over 100 days at...
Abstract For migratory species, successful navigation is critical to fitness. In Atlantic salmon, for example, there evidence that during migration from natal streams the sea, passage through waters with poorly defined or mixed water velocity patterns may constrain directional navigation, causing individuals become trapped delayed in lakes other bodies slowly flowing water. this study, we determined minimum velocities needed elicit a behavioural response, case change direction of holding...
Abstract Acoustic telemetry was used to track salmon smolts during river migration and into the open marine coastal zone. We compared direction speed with particle tracking simulations test hypothesis that pathways are defined by active swimming current following behaviour. Habitat-specific survival rates, movement speeds, depths directions in riverine, estuarine, habitats were also quantified. Salmon post-smolts did not disperse at random as they entered unrestricted, zone of North sea;...
Abstract There is some evidence that the river migration success of Atlantic salmon smolts, on their first to sea, varies both spatially and temporally. However, we have only a poor understanding what may be driving this variation. In study, used acoustic telemetry quantify spatial temporal variations in smolts sea. total 4120 migrating through 22 rivers Scotland, England, Ireland, Northern Ireland over multiple years were included study. Individuals defined as successful migrants if...
What little is known about the seaward migration of Salmo salar smolt through standing waters indicates that it both slow and results in high mortality rates, compared with riverine migration. This may be partly because smolts lakes need to swim more actively require complex directional cues than they do rivers. In this telemetry study Loch Lomond, S. made repeated movements directions away from outflowing river, which considerably increased time.
Abstract The Atlantic salmon, Salmo salar Linnaeus 1758, is a charismatic, anadromous species that has faced dramatic declines throughout its range. There currently lack of information on the effect free-standing bodies water key life event, sea migration, for species. This study extends our understanding in this area by combining acoustic telemetry with correlated random walk model to try examine potential morphological and behavioural factors differentiate successful from unsuccessful...
Abstract The process of smolting is a critical phase in the life cycle anadromous salmonids, and it has been associated with substantial rates mortality. Survival during freshwater marine migration known to have population‐level effects; thus, an understanding patterns mortality potential yield important insights into population bottlenecks. Despite advancements tracking techniques, specifics events salmonids their initial sea remain somewhat elusive. Here, we develop framework combining...
There are strong signals that the selection forces favouring expression of long-distance sea migration by Atlantic salmon (Salmo salar) changing. Unlike many other behavioural traits, costs incurred before any fitness benefits become apparent to migrant. The this behaviour has thus been shaped over multiple generations and cannot respond short interval (within a single generation) environmental change as traits can. Here we provide framework examine evolutionary ecological consequences...
It is thought that survival during migration particularly poor for Atlantic salmon post-smolts immediately after entry into sea and in the estuarine environment. Nonetheless, there currently a lack of information on post-smolt movement behaviour estuaries UK. This study used acoustic tagging to estimate loss rates compare migrating from two distinctly different rivers draining Clyde Estuary, River Endrick (n = 145) Gryffe 102). Contrary most literature, undertook rapid migrations through...
Abstract Atlantic salmon populations appear to fluctuate stochastically through time. It is suspected that both density‐dependent and density‐independent factors cause these fluctuations but the relative importance of each, life stages at which they operate, not well known. In this study, a long‐term data set on migrants returning Foyle catchment, Ireland, was used determine role stage‐specific environmental regulating population size. A Ricker model showed spawning adult size significantly...
In recent decades conservation measures for the rarest freshwater fish in U.K., vendace (Coregonus albula), have included attempts to form refuge populations Scotland. Here we report that at two of these sites where status introduced was previously unknown (Loch Earn and Daer Reservoir) surveys established are reproducing successfully situ, albeit appear be relatively numerically small. At a third site, Loch Valley, there no evidence survey, but it is possible small, as yet undetectable...
Abstract We use a long time series of catch abundance from recreational fishery over 116 years to look for population trends in Atlantic salmon, and anadromous (sea trout) non-anadromous (brown) trout single catchment, Loch Lomond, west central Scotland. Year strongly predicted variation catches but effort did not meaningfully increase explained variation. Salmon showed periods increasing decreasing trends, sea brown there was an overall declining trend. Since 1952, Lomond salmon differed...
Abstract Background Combining data from multiple acoustic telemetry studies has revealed that west coast England Atlantic salmon ( Salmo salar L.) smolts used a northward migration pathway through the Irish Sea to reach their feeding grounds. Hundred were captured and tagged in May 2020 River Derwent, northwest as part of an Environment Agency/Natural funded project. Results Three detected on marine receivers distributed across two separate arrays different projects Sea. One fish had...
Abstract Trap and transport, the capture subsequent translocation of fish during freshwater phase their migration, is becoming more common as a management intervention. Although technique can be successful, it costly have unintended effects on being transported. This study investigates whether trap transport used to increase migration success Atlantic salmon, Salmo salar , smolts in naturally flowing rivers. Seaward‐migrating S. ( n = 294) from two UK rivers were tracked using acoustic...
Abstract Untangling the patterns and proximate drivers of intraspecific genetic phenotypic structuring informs our understanding evolutionary processes shaping diversity. This study investigated morphological brown trout ( Salmo trutta L.) populations across varying spatial scales in a single, complex, dendritic river catchment examined potential natural anthropogenic environmental features driving this structuring. Morphometric hierarchical analyses fish from 22 sampling sites River Foyle...
ABSTRACT Migratory species typically undertake demanding long‐distance journeys, across different habitat types during which they are exposed to multiple natural and anthropogenic stressors. Mortality migration is high may be human induced. Understanding individual responses these selection pressures rarely attempted because of the challenges relating phenotypic genetic data success. Here, we show distinct single nucleotide polymorphism (SNP) sets significantly differentiated between...
Abstract Migration is a high‐risk behavior. For the Atlantic salmon, Salmo salar , migrating from its river nursery area to marine feeding grounds, magnitude of risk varies with habitat type. Passage through lakes, in particular, associated low rates migration success. Downstream salmon smolts are rheotactic when rivers, but lakes typically provide poorer directional currents for salmon. In this study we tested if, absence clear navigational cues switch random search strategy find outflowing...
Abstract Electrofishing techniques are widely used for the estimation of size stream‐dwelling fish populations both fishery management and scientific study. In contrast to multiple pass, population depletion methods, single‐pass catch‐per‐unit‐effort ( CPUE ) methods less time‐consuming labour‐intensive. A possible issue with commonly fixed total time protocol is that it does not differentiate between spent actively fishing incurred while (e.g. removing from nets navigating site). This...
Abstract There is generally a very poor understanding of how anadromous brown trout, Salmo trutta , use marine ecosystems. In this study, we acoustic telemetry techniques to test four alternative hypotheses for estuarine coastal habitat by species on population in the Clyde, west‐central Scotland. Anadromous trout their second (or more) summer feeding environment did not show patterns predicted from studies other populations species. They (a) inner Clyde Estuary as staging post onward...
Abstract Facultative migration occurs when, in response to prevailing conditions, individuals a population may (or not) undertake migration. The brown trout ( Salmo trutta ) is species that exhibits facultative migration, where some within populations move mainstem rivers (fluvial–adfluvial migration), lakes (lacustrine–adfluvial estuaries (partial anadromy) or sea (anadromy) feed, while others remain resident. This study attempts separate two alternative hypotheses for the structuring...
The natural environment of the Loch Lomondside area, Scotland is exceptionally well-studied. Here we describe a project to catalogue publications that these studies, and form living database references. We recorded 1,436 references from mainstream scientific literature reports “grey literature”. taxonomic groups habitats studied were highly skewed. Faunal studies considerably commoner than those flora; on vertebrate species invertebrate species; fish birds more commonly other groups. Reports...
Abstract Migratory species typically undertake demanding long-distance journeys, across different habitat types during which they are exposed to multiple natural and anthropogenic stressors. Mortality migration is high, may be exacerbated by human-induced pressures. Understanding individual responses these selection pressures rarely attempted, because of the challenges relating phenotypic genetic data success. Here we show distinct Single Nucleotide Polymorphism (SNP) sets significantly...