scholarly journals Few Impacts of Introduced Cutthroat Trout (Oncorhynchus clarki) on Aquatic Stages of Boreal Toads (Anaxyrus boreas boreas)

2021 ◽  
Vol 55 (3) ◽  
Author(s):  
John G. Crockett ◽  
Wendy E. Lanier ◽  
Larissa L. Bailey
Keyword(s):  
Cutthroat Trout ◽  
Oncorhynchus Clarki ◽  
Anaxyrus Boreas Boreas ◽  
Boreal Toads ◽  
Anaxyrus Boreas

scholarly journals Highly variable rates of survival to metamorphosis in wild boreal toads ( Anaxyrus boreas boreas )

2020 ◽  
Vol 62 (2) ◽  
pp. 258-268
Author(s):  
John G. Crockett ◽  
Larissa L. Bailey ◽  
Erin Muths
Keyword(s):  
Anaxyrus Boreas Boreas ◽  
Boreal Toads ◽  
Anaxyrus Boreas

scholarly journals Spermiation response to exogenous hormone therapy in hibernated and non-hibernated boreal toads (Anaxyrus boreas boreas)

2021 ◽  
Author(s):  
Andrew J. Kouba ◽  
Cecilia J. Langhorne ◽  
Scott T. Willard ◽  
Theodore Smith ◽  
Carrie K. Kouba
Keyword(s):  
Hormone Therapy ◽  
Exogenous Hormone ◽  
Anaxyrus Boreas Boreas ◽  
Boreal Toads ◽  
Anaxyrus Boreas

Scale and landscape perception: the case of refuge use by Boreal Toads (Anaxyrus boreas boreas)

2012 ◽  
Vol 90 (8) ◽  
pp. 1015-1022 ◽  
Author(s):  
Z.L. Long ◽  
E.E. Prepas
Keyword(s):  
Woody Debris ◽  
Physical Structure ◽  
Home Ranges ◽  
Movement Behaviour ◽  
Refuge Use ◽  
Landscape Perception ◽  
Critical Resource ◽  
Anaxyrus Boreas Boreas ◽  
Boreal Toads ◽  
Anaxyrus Boreas

Refugia likely represent a critical resource necessary for the persistence of populations of Boreal Toads ( Anaxyrus boreas boreas (Baird and Girard, 1852)) in a given area. However, the features that define suitable refuge microsites and the extent to which the habitat surrounding refugia is exploited remains unclear. We sought to describe refuge characteristics in the context of their surroundings and to determine whether local-scale movement behaviour associated with refuge use might provide a novel perspective of landscape-level habitat selection. A pilot study suggested that refugia were selected primarily for physical structure in the form of coarse woody debris, but this was not the case. Instead, refugia provided favourable microclimates with elevated relative humidity compared with the surrounding habitat. Boreal Toads tended to forage at night within 15 m from refugia. This distance was used to calculate activity centres across toad summer home ranges. Activity centres prioritized the importance of treeless habitat overall and wetland habitat for females when compared with 50% core home ranges. This approach could be used to pinpoint critical habitat at the landscape scale, which may be of particular importance for conserving populations currently in decline.

Unpalatable, yet unprotected: trout reduce survival and development rate of rare toad tadpoles despite chemical defense

2017 ◽  
Vol 74 (4) ◽  
pp. 494-502 ◽  
Author(s):  
Wendy E. Lanier ◽  
Kevin R. Bestgen ◽  
W. Chris Funk ◽  
Larissa L. Bailey
Keyword(s):  
Captive Breeding ◽  
Cutthroat Trout ◽  
Negative Effects ◽  
Oncorhynchus Clarkii ◽  
Predator Prey ◽  
Survival And Development ◽  
Negative Impacts ◽  
Oncorhynchus Clarkii Stomias ◽  
Anaxyrus Boreas Boreas ◽  
Anaxyrus Boreas

Unpalatable prey species often have toxins that protect from direct consumption. However, negative effects of prey manipulation by predators are rarely considered and may understate impacts to unpalatable species. When both prey and predator are species of concern, stronger understanding of the predator–prey relationship is warranted. We explored direct and indirect effects of greenback cutthroat trout (Oncorhynchus clarkii stomias) on boreal toad (Anaxyrus boreas boreas) tadpole survival, growth, and development, as well as postmetamorphosis survival and growth. We found exposure to O. clarkii stomias delayed metamorphosis by 1–2.5 days and reduced tadpole survival by up to 25%, even though only a single tadpole was consumed. Tadpoles from captive-bred eggs had lower survival, growth, and greater loss in body condition after metamorphosis compared with tadpoles from wild eggs. We found that O. clarkii stomias do not innately avoid A. boreas boreas but instead strike tadpoles to determine prey palatability and repeated gustation likely reduced survival. Our results shed light on unresolved issues with A. boreas boreas captive breeding and demonstrate the nonconsumptive negative impacts of predators.

A hormone priming regimen and hibernation affect oviposition in the boreal toad (Anaxyrus boreas boreas)

2015 ◽  
Vol 84 (4) ◽  
pp. 600-607 ◽  
Author(s):  
N.E. Calatayud ◽  
C.J. Langhorne ◽  
A.C. Mullen ◽  
C.L. Williams ◽  
T. Smith ◽  
...  
Keyword(s):  
Anaxyrus Boreas Boreas ◽  
Anaxyrus Boreas

scholarly journals Hybridization of Snake River Cutthroat in the Lower Gros Ventre River

2006 ◽  
Vol 30 ◽  
pp. 110-113
Author(s):  
Ryan Kovach ◽  
Lisa Eby
Keyword(s):  
Exotic Species ◽  
National Park ◽  
Cutthroat Trout ◽  
Snake River ◽  
Oncorhynchus Clarki ◽  
Oncorhynchus Clarkii ◽  
Grand Teton National Park ◽  
Water Diversions ◽  
Yellowstone Cutthroat Trout ◽  
Special Concern

The cutthroat trout Oncorhynchus clarki is Wyoming's only native trout. The Yellowstone cutthroat trout (Oncorhynchus clarkii bouvieri) is designated as a "species of special concern" by a number of agencies and conservation groups. Although the Yellowstone cutthroat trout has recently avoided federal listing because of robust headwater populations (USFWS 2006), they face continued threats across their range. The fine-spotted Snake River native trout is a morphologically divergent ecotype of the Yellowstone subspecies, although it is not genetically distinguishable (Allendorf and Leary 1988, Novak et al. 2005). The Gros Ventre, an important tributary of the Snake River located partially in Grand Teton National Park, historically supported robust populations of fine­ spotted Snake River cutthroat trout. Principal threats to Gros Ventre native trout, especially in the lower end of the drainage within the park boundaries, include both water diversions (loss of water and fish into irrigation ditches) and presence of exotic species.

Detection of Nucleospora salmonis in cutthroat trout (Oncorhynchus clarki) and rainbow trout (Oncorhynchus mykiss) by loop-mediated isothermal amplification

Aquaculture ◽  
2009 ◽  
Vol 288 (1-2) ◽  
pp. 27-31 ◽  
Author(s):  
Masahiro Sakai ◽  
Dolores V. Baxa ◽  
Tomofumi Kurobe ◽  
Tomoya Kono ◽  
Raghunath B. Shivappa ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Cutthroat Trout ◽  
Isothermal Amplification ◽  
Oncorhynchus Clarki ◽  
Loop Mediated Isothermal Amplification ◽  
Rainbow Trout Oncorhynchus Mykiss

Size-Structured Morality in a Treespine Stickleback (Gastrosteus aculeatus) – Cutthroat Trout (Oncorhynchus clarki) Community

1990 ◽  
Vol 47 (6) ◽  
pp. 1194-1205 ◽  
Author(s):  
T. E. Reimchen
Keyword(s):  
Gasterosteus Aculeatus ◽  
Size Structure ◽  
Adult Population ◽  
Total Mortality ◽  
Cutthroat Trout ◽  
Oncorhynchus Clarki ◽  
Small Fish ◽  
Frequency Distributions ◽  
Queen Charlotte Islands ◽  
Young Of The Year

In a 112-ha bog lake on the Queen Charlotte Islands, British Columbia, small fish comprised the major element in the diet of cutthroat trout (Oncorhynchus clarki). Despite the presence of juvenile salmon and char in the lake, threespine stickleback (Gasterosteus aculeatus) was the most common fish in the diet (99.5%). Foraging activity appeared to be more frequent in littoral than in limnetic regions. Mark–recapture methods indicate an average population of 220 trout and 75 000 adult stickleback. Trout consumed an estimated 308 770 stickleback yearly (145 kg) of which 65% were taken during summer. Seventy-three percent of all fish consumed were young of the year and 2% were adults, the latter representing 4% of the adult population in the lake. There was a 75% reduction in total mortality between successive year classes of stickleback (0,1,2,3 +). This consumption curve, which resembles a typical survivorship curve of fish, is a function of the size-structure of the populations and includes interactions between size availability of stickleback, prey-size preferences of the trout, and length frequency distributions of trout. Total weight of stickleback consumed by trout comprised about 40% of that previously calculated for 16 species of avian piscivores in the lake.

scholarly journals Inhibitory bacteria reduce fungi on early life stages of endangered Colorado boreal toads (Anaxyrus boreas)

2015 ◽  
Vol 10 (4) ◽  
pp. 934-944 ◽  
Author(s):  
Jordan G Kueneman ◽  
Douglas C Woodhams ◽  
Will Van Treuren ◽  
Holly M Archer ◽  
Rob Knight ◽  
...  
Keyword(s):  
Early Life ◽  
Life Stages ◽  
Early Life Stages ◽  
Boreal Toads ◽  
Anaxyrus Boreas ◽  
Inhibitory Bacteria
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