scholarly journals Modelling the dispersal of riverine fish larvae: from a raster-based analysis of movement patterns within a racetrack flume to a rheoreaction-based correlated random walk (RCRW) model approach

2017 ◽  
Vol 74 (9) ◽  
pp. 1474-1489 ◽  
Author(s):  
Martin Glas ◽  
Michael Tritthart ◽  
Bernhard Zens ◽  
Hubert Keckeis ◽  
Aaron Lechner ◽  
...  
Keyword(s):  
Random Walk ◽  
Larval Fish ◽  
Fish Larvae ◽  
Movement Patterns ◽  
Release Site ◽  
Random Walk Model ◽  
Correlated Random Walk ◽  
Particle Tracing ◽  
Nursery Habitats ◽  
Chondrostoma Nasus

Recruitment of Chondrostoma nasus and similar fish species in rivers is related to spatiotemporal linkages between larval hatching and nursery habitats. Active swimming behaviour contradicts the assumption that passive particle tracing models can serve as a proxy for larval dispersal models. A racetrack flume with an inshore area of near-natural slope was created to observe individual larval trajectories. A new three-step, raster-based analysis was developed to distinguish four types of movement patterns: active upstream, active downstream, active–passive, and passive. Both larval developmental stage-specific and release site-specific occurrences of these movement patterns were experimentally found for nine flow velocity classes (≤0.225 m·s−1). These current-induced movement patterns, and evaluated durations within them, were used to develop a biased and correlated random walk model that includes rheoreaction — a key behavioural response of fish to flow within rivers. The study introduces the concept and application of a rheoreaction-based correlated random walk model, which coupled with a 3D hydrodynamic model, allows prediction of the spatiotemporal effects of various river discharges, morphologies, and restoration scenarios on larval fish dispersal.

A correlated random walk for the transport and sedimentation of particles

1988 ◽  
Vol 25 (A) ◽  
pp. 335-346
Author(s):  
J. Gani
Keyword(s):  
Markov Chain ◽  
Random Walk ◽  
Continuous Time ◽  
Laplace Transforms ◽  
The State ◽  
Random Walk Model ◽  
Rectangular Lattice ◽  
Correlated Random Walk ◽  
Bivariate Markov Chain

This paper considers a bivariate random walk modelon a rectangular lattice for a particle injected into a fluid flowing in a tank. The numbers of jumps of the particle in thexandydirections in this particular model are correlated. It is shown that when the random walk forms a bivariate Markov chain in continuous time, it is possible to obtain the state probabilitiespxy(t) through their Laplace transforms. Two exit rules are considered and results for both of them derived.

scholarly journals Navigational efficiency in a biased and correlated random walk model of individual animal movement

Ecology ◽  
2017 ◽  
Vol 99 (1) ◽  
pp. 217-223 ◽  
Author(s):  
Joseph D. Bailey ◽  
Jamie Wallis ◽  
Edward A. Codling
Keyword(s):  
Random Walk ◽  
Animal Movement ◽  
Random Walk Model ◽  
Individual Animal ◽  
Correlated Random Walk

Diel and tidal abundance of fish larvae in a barrier-estuary channel in New South Wales

2001 ◽  
Vol 52 (7) ◽  
pp. 995 ◽  
Author(s):  
T. Trnski
Keyword(s):  
Larval Fish ◽  
Fish Larvae ◽  
New South ◽  
New South Wales ◽  
Common Species ◽  
South Wales ◽  
Marine Source ◽  
Nursery Habitats ◽  
Current Flows ◽  
June July

In four 24-h series of ichthyoplankton sampling during winter (June–July) 1996 in Swansea Channel (which connects Lake Macquarie with coastal waters of central New South Wales, Australia) 3367 fish larvae representing at least 77 species were collected. The larval fish community clustered by sampling date and by diel phase. Diel phase had a stronger influence on abundance of more common taxa than did tide phase, and also most influence on community structure. For most taxa there was no difference in abundance between flood and ebb tides, regardless of the estuarine or marine source of the eggs and larvae. All but two of 16 common species were present in Swansea Channel throughout their entire larval stage. The sparids Acanthopagrus australis and Rhabdosargus sarbawere present in the channel only at settlement-competent sizes. These two species showed evidence of selective presence in the channel during a particular diel or tidal phase, with A. australis apparently preferring night-flood tides, which would aid migration to the estuarine nursery habitats in Lake Macquarie. The ability or inclination to escape the strong bi-directional flows in channels seems limited to only a few taxa that appear to respond to physical cues and tidal current flows.

scholarly journals Shoreline configurations affect dispersal patterns of fish larvae in a large river

2013 ◽  
Vol 71 (4) ◽  
pp. 930-942 ◽  
Author(s):  
Aaron Lechner ◽  
Hubert Keckeis ◽  
Elisabeth Schludermann ◽  
Franz Loisl ◽  
Paul Humphries ◽  
...  
Keyword(s):  
Fish Larvae ◽  
Local Population ◽  
Sampling Period ◽  
Large River ◽  
Main Channel ◽  
Dispersal Patterns ◽  
Larval Stages ◽  
Nursery Habitats ◽  
Chondrostoma Nasus ◽  
Gravel Bar

Abstract The dispersal patterns of marked larvae of the nase carp (Chondrostoma nasus L.) were observed alongside dissimilar shoreline configurations in the main channel of the free-flowing Austrian Danube and compared with those of floating particles to investigate the mode of dispersal (active–passive). Individuals of different larval stages and floats at similar densities were released at an artificial rip-rap with groynes and a rehabilitated gravel bar. In both habitats, marked individuals were recaptured during the sampling period of 4 d after release. Relevant shoreline attributes for larval dispersal, such as the accessibility of nursery habitats, connectivity between adjacent habitats, and retention potential, were more pronounced at the gravel bar than at the rip-rap. At the gravel bar, larvae moved upstream and downstream within the connected bankside nurseries and displayed longer residence times. Larvae settled in groyne fields along the rip-rap as well; however, longitudinal dispersal was disrupted by groynes, forcing larvae to enter the main channel. Rather than settling in subsequent groyne fields, we assume that these larvae are displaced downstream and potentially lost from the local population.

Movement patterns and foraging ecology of a stream caddisfly larva

1980 ◽  
Vol 58 (6) ◽  
pp. 1174-1185 ◽  
Author(s):  
David D. Hart ◽  
Vincent H. Resh
Keyword(s):  
Random Walk ◽  
Foraging Ecology ◽  
Movement Patterns ◽  
Activity Budget ◽  
Random Walk Model ◽  
Northern California ◽  
Seasonal Differences ◽  
Time Activity ◽  
Phenological Changes ◽  
Dicosmoecus Gilvipes

The movement patterns and time–activity budgets of Dicosmoecus gilvipes were quantified from underwater observations of marked individuals in a northern California stream, during two studies in early and late June, 1977. Individuals traveled several metres per day. The only striking differences between the observed patterns of movement and those predicted from a random walk model are the following: (a) in both studies, large larvae moved significantly farther than small larvae; (b) in both studies, there is a pronounced diel rhythm to movement, with animals traveling faster during the day; (c) rates of travel in late June are ~3 times faster than those in early June. Since more than two-thirds of the total time–activity budget of these larval insects is dedicated to feeding, we suggest that the patterns of movement reported here largely reflect activities related to food acquisition. Several observations indicate that food is locally limiting and heterogeneously distributed across the stream bottom, thus requiring animals to move from patch to patch in order to meet their food requirements. Seasonal differences in rates of movement appear to result from phenological changes in the quantitative and qualitative food requirements of these stream insect grazers.

Dispersal and retention of larval fish in a potential nursery habitat of a large temperate river: an experimental study

2012 ◽  
Vol 69 (8) ◽  
pp. 1302-1315 ◽  
Author(s):  
Elisabeth Schludermann ◽  
Michael Tritthart ◽  
Paul Humphries ◽  
Hubert Keckeis
Keyword(s):  
Larval Dispersal ◽  
Larval Fish ◽  
Three Dimensional ◽  
Nursery Habitat ◽  
Hydrodynamic Characteristics ◽  
Particle Tracing ◽  
Successful Recruitment ◽  
Hydraulic Conditions ◽  
Chondrostoma Nasus ◽  
Drifting Larvae

Little information is available on governing factors of larval fish dispersal in natural river systems. Therefore, we aimed to describe dispersal and retention of marked larval nase carp, Chondrostoma nasus , along a shoreline nursery habitat of the River Danube. Based on a three-dimensional hydrodynamic model, we analyzed the influence of the hydraulic conditions on larval dispersal. We also related observed larval pathways to numerical particle tracing. Clear differences in the temporal drift pattern were due to significant differences in the hydrodynamic characteristics of the release stations. Some larvae remained in the study reach, most upstream of the release point. These were significantly larger than drifting larvae. We conclude that larval dispersal has an active component and that dispersal and retention patterns are dependent on the habitat structure and hydrodynamic characteristics of the releasing points. This emphasizes the importance of links between the location of spawning sites within the river and variation in flow during early development, the combination of which may contribute to successful recruitment of fluvial fish species.

CONTINUOUS-TIME CORRELATED RANDOM WALK MODEL FOR ANIMAL TELEMETRY DATA

Ecology ◽  
2008 ◽  
Vol 89 (5) ◽  
pp. 1208-1215 ◽  
Author(s):  
Devin S. Johnson ◽  
Joshua M. London ◽  
Mary-Anne Lea ◽  
John W. Durban
Keyword(s):  
Random Walk ◽  
Continuous Time ◽  
Random Walk Model ◽  
Correlated Random Walk ◽  
Telemetry Data
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