scholarly journals Effects of water temperature, turbidity, and rainbow trout on humpback chub population dynamics

Fact Sheet ◽  
2019 ◽  
Author(s):  
Charles Yackulic ◽  
Julia B. Hull
Keyword(s):  
Population Dynamics ◽  
Rainbow Trout ◽  
Water Temperature ◽  
Humpback Chub

scholarly journals Effects of Temperature and Salinity on Vibrio vulnificus Population Dynamics as Assessed by Quantitative PCR

2004 ◽  
Vol 70 (9) ◽  
pp. 5469-5476 ◽  
Author(s):  
Mark A. Randa ◽  
Martin F. Polz ◽  
Eelin Lim
Keyword(s):  
Population Dynamics ◽  
Water Temperature ◽  
Water Column ◽  
Quantitative Pcr ◽  
Vibrio Vulnificus ◽  
Most Probable Number ◽  
Salinity Regime ◽  
Optimal Salinity ◽  
Probable Number ◽  
Barnegat Bay

ABSTRACT The abundance of Vibrio vulnificus in coastal environments has been linked to water temperature, while its relationship to salinity is less clear. We have developed a culture-independent, most-probable-number quantitative PCR approach to examine V. vulnificus population dynamics in Barnegat Bay, N.J. Based on the combined analysis of our results from Barnegat Bay and from the literature, the present data show that (i) V. vulnificus population dynamics are strongly correlated to water temperature and (ii) although the general trend is for V. vulnificus abundance to be inversely correlated with salinity, this relationship depends on salinity levels. Irrespective of temperature, high abundances of V. vulnificus are observed at 5 to 10 ppt, which thus appears to be the optimal salinity regime for their survival. At 20 to 25 ppt, V. vulnificus abundances show a positive correlation to salinity. Unsuccessful attempts to resuscitate V. vulnificus, combined with our inability to detect cells during the winter despite an assay adapted to detect viable but nonculturable (VBNC) cells, suggest that the decline and eventual disappearance of V. vulnificus from the water column during the winter months is due primarily to a significant reduction in population size and is not only the consequence of cells entering the VBNC state. These findings are in line with the hypothesis that the sediment serves as a refuge for a subpopulation of V. vulnificus over the winter and weather-driven mixing events during the spring initiate a summer bloom in the water column.

Predicting Distribution, Production, Recreational Fishing Demand, and Conservation Concern of Indigenous Rainbow Trout Populations Based on Landscape Characteristics

2021 ◽  
Author(s):  
Ariane Cantin ◽  
Anne Farineau ◽  
Darren J. Bender ◽  
John R. Post
Keyword(s):  
Population Dynamics ◽  
Rainbow Trout ◽  
Recreational Fishing ◽  
Lake Area ◽  
Fishing Pressure ◽  
Stream Network ◽  
Landscape Characteristics ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Conservation Concern ◽  
Patterns And Processes

Landscape ecology has mainly been integrated in aquatic science to describe patterns and processes in stream networks, but many lakes are connected through their tributaries and are also impacted by their position and connectivity within the watershed. This information on lake characteristics can be used by inland fisheries managers that oversee large landscapes comprising many waterbodies to predict: (1) species composition; (2) population dynamics and productivity; (3) recreational fishing pressure; and (4) overall conservation concern. We developed a methodology to assess these four items for the rainbow trout (Oncorhynchus mykiss) fishery of British Columbia by presenting a case study focused on the Clearwater and North Thompson watersheds using: the connectivity of lakes within the stream network to predict rainbow trout presence, stream order and lake area to estimate habitat availability and predict population dynamics and productivity (supply), and travel time from population centres to predict recreational fishing pressure (demand). By incorporating connectivity and environmental proxies of habitat, we explore patterns in population dynamics that can be used by fisheries managers to identify populations sensitive to overfishing or disturbance.

scholarly journals Predicting harvest of non-native signal crayfish in lakes — a role for changing climate?

2016 ◽  
Vol 73 (5) ◽  
pp. 785-792 ◽  
Author(s):  
Patrik Bohman ◽  
Lennart Edsman ◽  
Alfred Sandström ◽  
Per Nyström ◽  
Marika Stenberg ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Water Temperature ◽  
Temperature Data ◽  
Adult Survival ◽  
Winter Mortality ◽  
Freshwater Crayfish ◽  
Catch Per Unit Effort ◽  
Signal Crayfish ◽  
Cool Water ◽  
Air Temperatures

The signal crayfish (Pacifastacus leniusculus) was introduced to Sweden in 1960, and it has a high commercial and recreational value, but it may also have negative effects on native ecosystems. To better predict how climate warming will affect population dynamics of this cool-water crayfish, we explored the role of temperature and density dependence as explanatory factors of the subsequent years’ catch rates of commercially sized signal crayfish in four Swedish lakes. We found air temperatures to be good proxies for water temperatures in all lakes, except during winter. We could only obtain water temperature data for Lake Vättern, and winter temperature data were therefore only included in the analysis of catch-per-unit-effort patterns in this lake. Our results indicate that increasing mean air temperatures will potentially affect the population dynamics of cool-water freshwater crayfish species such as the signal crayfish. Based on data from four lakes, it seems that the population dynamics of signal crayfish are lake-specific and could be affected by either recruitment during the juvenile stage, the survival and growth of adults, or both. Increased fluctuations in water temperature during winter may potentially influence adult survival. To better predict the effects of global warming on the dynamics of cool-water crayfish populations, we suggest that future studies should investigate recruitment in crayfish along temperature gradients and the influence of variations in water temperature on winter mortality.

scholarly journals Micronucleus occurrence in diploid and triploid rainbow trout (Oncorhynchus mykiss Walbaum)

2012 ◽  
Vol 48 (No. 8) ◽  
pp. 215-220 ◽  
Author(s):  
I. Strunjak-Perovic ◽  
R. Coz-Rakovac ◽  
N. Topic Popovic
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Water Temperature ◽  
Peripheral Circulation ◽  
Ploidy Levels ◽  
Mean Values ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Significant Difference

The aim of the study was to observe the influence of different ploidy levels in fish on micronucleus occur­rence. Twenty minutes after fertilization, one group of rainbow trout eggs was exposed to water temperatures of 26°C in duration of 20 minutes to induce triploidy. Second group was kept in water temperature of 10°C, which is optimal for development of rainbow trout. The frequency of micronucleated erythrocytes was determined in the peripheral circulation of rainbow trout 67 days (following absorption of the yolk – swim-up stage) and 128 days (fry stage) post fertilization. There was a significant difference (P < 0.001) between frequency of micronucleated erythrocytes of diploid (1.10 ± 0.96‰) and triploid (2.41 ± 1.28‰) fish at swim-up stage. Increased mean values of micronucleus in diploid (1.80 ± 1.57‰) and triploid (5.92 ± 3.80‰) fry were also recorded.

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