scholarly journals Phenological Diversity of Salmon Smolt Migration Timing within a Large Watershed

2018 ◽  
Vol 147 (5) ◽  
pp. 775-790 ◽  
Author(s):  
Charmaine N. Carr-Harris ◽  
Jonathan W. Moore ◽  
Allen S. Gottesfeld ◽  
Jennifer A. Gordon ◽  
William M. Shepert ◽  
...  
Keyword(s):  
Migration Timing ◽  
Phenological Diversity ◽  
Salmon Smolt

scholarly journals Extent of predation bias present in migration survival and timing of Atlantic salmon smolt (Salmo salar) as suggested by a novel acoustic tag

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Jason Daniels ◽  
Stephen Sutton ◽  
Dale Webber ◽  
Jonathan Carr
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Acoustic Telemetry ◽  
Lower Estuary ◽  
Ph Change ◽  
Apparent Survival ◽  
Migration Timing ◽  
Acoustic Tags ◽  
Receiver Arrays ◽  
Salmon Smolt

Abstract Background Acoustic telemetry is increasingly being used as a tool to measure survival, migration timing and behaviour of fish. Tagged fish may fall prey to other animals with the tag continuing to be detected whilst it remains in the gastrointestinal tract of the predator. Failure to identify post-predation detections introduces “predation bias” into the data. We employed a new predator tag technology in the first known field trial to understand the extent these tags could reduce predation bias in Atlantic salmon (Salmo salar L.) smolt migration through a 65-km zone beginning in freshwater and extending through an estuary. These tags signal predation by detecting a pH change in the predators’ gut during digestion of a tagged prey. We quantified survival and timing bias by comparing measurements from non- and post-predated detections of tagged individuals’ to only those detections where predation was not signalled. Results Of the 50 fish tagged, 41 were detected with 24 of these signalling as predated. Predation bias was greatest in the upper estuary and decreased towards the bay. Survival bias peaked at 11.6% at river km 54. Minimum and maximum migration time were both biased long and were 16% and 4% greater than bias corrected timing at river km 66 and 54, respectively. After correcting for bias, the apparent survival from release through freshwater and estuary was 19% and minimum and maximum migration timing was 6.6 and 7.0 days, respectively. Conclusions Using this tag, we identified a high proportion of predation events that may have otherwise gone unnoticed using conventional acoustic tags. Estimated survival presented the greatest predation bias in the upper estuary which gradually declined to nearly no apparent bias in the lower estuary as predated tags failed through time to be detected. This is most likely due to tag expulsion from the predator between or upstream of receiver arrays. Whilst we have demonstrated that predation can bias telemetry results, it appears to be rather short-lived given the apparent retention times of these tags within the predators introducing the bias.

scholarly journals EVALUATION OF A DIVERSION FACILITY DURING DOWNSTREAM MIGRATION OF MASU SALMON SMOLT AT THE PIRIKA DAM, HOKKAIDO, JAPAN

2015 ◽  
Vol 71 (4) ◽  
pp. I_943-I_948
Author(s):  
Kazufumi HAYASHIDA ◽  
Hisaya NII ◽  
Kazuyoshi WATANABE ◽  
Toshiyuki MIYAZAKI ◽  
Hiroshi UEDA
Keyword(s):  
Masu Salmon ◽  
Downstream Migration ◽  
Salmon Smolt

Monitoring Climate Impacts: Survival and Migration Timing of Summer Chum Salmon in Salmon Creek, Washington

2017 ◽  
Vol 146 (5) ◽  
pp. 983-995
Author(s):  
Joshua Weinheimer ◽  
Joseph H. Anderson ◽  
Mark Downen ◽  
Mara Zimmerman ◽  
Thom Johnson
Keyword(s):  
Chum Salmon ◽  
Climate Impacts ◽  
Migration Timing ◽  
And Migration

Less anxious salmon smolt become easy prey during downstream migration

2019 ◽  
Vol 687 ◽  
pp. 488-493 ◽  
Author(s):  
Jonatan Klaminder ◽  
Micael Jonsson ◽  
Johan Leander ◽  
Johan Fahlman ◽  
Tomas Brodin ◽  
...  
Keyword(s):  
Downstream Migration ◽  
Salmon Smolt

Mark-recapture models

1984 ◽  
Vol 16 (1) ◽  
pp. 24-24
Author(s):  
P. D. M. Macdonald
Keyword(s):  
British Columbia ◽  
Biological System ◽  
Probabilistic Model ◽  
General Model ◽  
Mark Recapture ◽  
Salmon Smolt

The interpretation of mark-recapture data depends on a probabilistic model for the biological system. The assumptions of the general model must be verified against what is known about the particular system. This talk considers the application of markrecapture methods to the estimation of salmon smolt migrations from Babine Lake, British Columbia.

scholarly journals Earlier Migration Timing, Decreasing Phenotypic Variation, and Biocomplexity in Multiple Salmonid Species

PLoS ONE ◽  
2013 ◽  
Vol 8 (1) ◽  
pp. e53807 ◽  
Author(s):  
Ryan P. Kovach ◽  
John E. Joyce ◽  
Jesse D. Echave ◽  
Mark S. Lindberg ◽  
David A. Tallmon
Keyword(s):  
Phenotypic Variation ◽  
Migration Timing ◽  
Salmonid Species

Automated monitoring of a large-scale cod (Gadus morhua) migration in the open sea

2002 ◽  
Vol 59 (12) ◽  
pp. 1845-1850 ◽  
Author(s):  
Luc A Comeau ◽  
Steven E Campana ◽  
Martin Castonguay
Keyword(s):  
Large Scale ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Seasonal Migration ◽  
Migration Routes ◽  
Eastern Canada ◽  
Migration Patterns ◽  
Migration Timing ◽  
Open Sea ◽  
And Migration

The migration patterns of marine fishes are poorly known, in part owing to the technical limitations associated with tracking the movements of animals in deep water. Here we document a large-scale, directed, migration of Atlantic cod (Gadus morhua) off eastern Canada. Our approach was based on the acoustic tagging of 126 fish and the deployment of 69 subsurface receivers, stretching over a 160-km distance along the edge of the Laurentian Channel. After 1 year of automated recording, we found that 65% of the fish migrated out of coastal waters in two distinct runs during the summer–autumn period. The offshore-migrating fish overwintered in deep Laurentian Channel waters, returning inshore in April. Individual migration routes and migration timing were variable, indicating that the cod did not aggregate in large schools during the seasonal migration events.

scholarly journals Exploratory analyses of migration timing and morphometrics of the Pied Flycatcher (Ficedula hypoleuca)

2016 ◽  
Vol 24 (2) ◽  
pp. 109-126 ◽  
Author(s):  
Andrea Harnos ◽  
Péter Fehérvári ◽  
Imre Sándor Piross ◽  
Zsolt Karcza ◽  
Nóra Ágh ◽  
...  
Keyword(s):  
Body Mass ◽  
Tail Length ◽  
Descriptive Statistics ◽  
Cumulative Distribution ◽  
Pied Flycatcher ◽  
Comprehensive Overview ◽  
Migration Timing ◽  
Arrival Dates ◽  
Annual Means ◽  
Fat Score

Abstract Ornithological studies often rely on large temporal scale ringing datasets as source of information. However, basic descriptive statistics of collected data are rarely provided. In order to fill this gap, here we present the first item of a series of exploratory analyses of migration timing and body size measurements of the most frequent Passerine species at a ringing station located in Central Hungary (1984–2015). First, we give a concise description of foreign ring recoveries of the Pied Flycatcher in relation to Hungary. We then shift focus to data of 2860 individuals deriving from the ringing station, where birds have been trapped, handled and ringed with standardized methodology since 1984. Timing is described through annual and daily capture and recapture frequencies and their descriptive statistics. We show annual mean arrival dates within the study period and we present the cumulative distribution of first captures with stopover durations. We present the distributions of wing, third primary, tail length and body mass, and the annual means of these variables. Furthermore, we show the distribution of individual fat and muscle scores, and the distribution of body mass within each fat score category. We distinguish migration periods (spring and autumn), age (i.e. juveniles and adults) and sex groups. Our aim is to provide a comprehensive overview of the analysed variables. However, we do not aim to interpret the obtained results, merely draw attention to interesting patterns, that may be worth exploring in detail. Data used here are available upon request for further analyses.

scholarly journals Regional variation in green-up timing along a caribou migratory corridor: spatial associations with snowmelt and temperature

2020 ◽  
Author(s):  
Christian John ◽  
Douglas Miller ◽  
Eric S. Post
Keyword(s):  
Explanatory Power ◽  
Arctic Region ◽  
Spring Temperature ◽  
Migration Timing ◽  
Predominant Factor ◽  
Long Term Trends ◽  
Low Arctic ◽  
Resource Variability ◽  
Migratory Corridor

Spring green-up in Arctic and alpine systems is predominantly controlled by temperature and snowmelt timing preceding and during the growing season. Variation in the timing of green-up across space is an important aspect of resource variability with which mobile herbivores must contend. Here, we measure the explanatory power of abiotic drivers of green-up in a Low Arctic region of west Greenland, host to a migratory caribou population. We identify inconsistent relationships between green-up and abiotic drivers across space. While green-up timing is most closely related to snowmelt in some areas, in others it is most closely related to spring temperature. The negative correlation between the explanatory power of snowmelt and temperature suggests that at broad scales, where green-up is more constrained by snow cover, such as moist, mountainous coastal areas, it is less constrained by temperature. Where snow is less persistent through winter, such as cold, dry inland areas, temperature becomes the predominant factor driving green-up. If the principal driver of spring plant growth is inconsistent across a region, long-term trends in resource phenology could vary spatially. For seasonal migrants like caribou, synchronizing migration timing with resource phenology may be complicated by discordant interannual change across drivers of green-up timing.

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