Dispersal between Tributary and Main-Stem Rivers by Juvenile Smallmouth Bass Evaluated Using Otolith Microchemistry

2010 ◽  
Vol 139 (1) ◽  
pp. 171-184 ◽  
Author(s):  
Robert Humston ◽  
Brant M. Priest ◽  
William C. Hamilton ◽  
Paul E. Bugas
Keyword(s):  
Otolith Microchemistry ◽  
Smallmouth Bass ◽  
Main Stem

Managing Centrarchid Fisheries in Rivers and Streams

2019 ◽  
Keyword(s):  
Local Population ◽  
Smallmouth Bass ◽  
Main Stem ◽  
Guadalupe River ◽  
Upstream Direction ◽  
Collection Data ◽  
Fish Collection ◽  
Break Points ◽  
Partial Isolation ◽  
Hybrid Distribution

<em>Abstract.</em>—We reexamined a local population of Guadalupe Bass <em>Micropterus treculii </em>after cessation of a stocking program that significantly reduced the number of individuals that were hybridized with Smallmouth Bass <em>M. dolomie</em> u. Analysis of five years of post-stocking fish collection data show that the percentage of hybrids has increased in all four study sections of the upper Guadalupe River since stocking stopped. We found that hybridization had increased from 0.0% to 9.9% in Johnson Creek, 19.8% to 28.8% in North Fork Guadalupe River, 5.6% to 12.0% in South Fork Guadalupe River, and 24.2% to 26.5% in Guadalupe River main stem sections. This represents an average increase of 6.8% for all streams combined (range = 2.2–9.9%) from the last year of stocking. We also examined hybridization levels in individual stream fragments created by instream barriers (<em>n </em>= 76) to assess spatial variability along tributary and main stem corridors. Although hybridization appears to be increasing on a stream-wide basis, finer scale analysis show that hybrid distribution was spatially complex and there was a substantial portion of the study area with little or no hybridization. There were gradients of decreasing hybridization in an upstream direction in each of the tributaries and marked break points upstream of which hybridization was considerably lower (<10%). We also found that hybridization was highly variable among individual stream fragments (range 0%–71.4%) including those immediately adjacent to one another. These findings suggest that instream barriers may restrict genetic mixing throughout the system and contribute to partial isolation of populations within stream fragments. As such, further targeted intervention efforts are likely necessary to further reduce hybridization in fragments that still contain high proportions of hybrids. The patchy distribution that we observed may be a critical component to consider in assessment and restoration efforts; not only for Guadalupe Bass but also in other endemic black basses threatened by hybridization.

Black Bass Diversity: Multidisciplinary Science for Conservation

2015 ◽  
Keyword(s):  
Local Population ◽  
Smallmouth Bass ◽  
Main Stem ◽  
Micropterus Dolomieu ◽  
South Fork ◽  
The North ◽  
North Fork ◽  
Guadalupe River ◽  
Black Bass ◽  
Management And Conservation

<em>Abstract</em>.—Interspecific hybridization among micropterids was once thought to be rare but has been documented in several cases of North American endemics. Introduction of the nonnative Smallmouth Bass <em>Micropterus dolomieu</em> across Texas has threatened to eliminate the Guadalupe Bass <em>M. treculii </em>genome throughout its native range via introgression between the species. In 1992, the Texas Parks and Wildlife Department began a stocking program in the Guadalupe River watershed to restore the genetic integrity of the local population. More than 600,000 hatchery-reared Guadalupe Bass fingerlings (~30 mm total length) were stocked in Johnson Creek over a 19-year period, and 360,000 fish were released in the North Fork, South Fork, and main-stem Guadalupe River over a 5-year period. Annual genetic monitoring indicated that hybridization significantly declined in all stream segments (<EM>P</EM> < 0.001) during the period of time when stocking occurred. Initially high hybridization rates (range, 20–100%; mean = 43.4%) were reduced to 0–24.2% (mean = 11.4%) at the termination of stocking. Linear regression indicated that hybridization in the North Fork and main-stem stream segments declined faster (9.0% per year) than all other test stream segments, whereas the South Fork Guadalupe River and upper Johnson Creek declined at 0.9% per year and lower Johnson Creek declined at 1.9% per year. Our data show that supplemental stocking is an effective approach to genetic restoration of compromised populations and should be considered as a viable management and conservation tool.

scholarly journals Patterns in spatial use and movement of Silver Carp among tributaries and main-stem rivers: Insight from otolith microchemistry analysis

2021 ◽  
Author(s):  
Jacob P Werner ◽  
Quintin J Dean ◽  
Mark A Pegg ◽  
Martin J Hamel
Keyword(s):  
River Basin ◽  
Silver Carp ◽  
Effective Means ◽  
Missouri River ◽  
Vital Role ◽  
Otolith Microchemistry ◽  
Main Stem ◽  
Invasive Fish ◽  
Kansas River ◽  
Spatial Use

Abstract Invasive Silver Carp (Hpophthalmichthys molitrix) have established populations throughout the Missouri River basin, including in the Kansas River. Understanding the spatial extent under which these invasive fish function in large, open river systems is crucial to inform management efforts. The Kansas River may play a vital role in the life-cycle of Silver Carp in the Missouri River basin as the main-stem Missouri River has undergone a multitude of alterations, creating a channel with greater mean depths and velocities. Here, we used otolith microchemistry of Silver Carp from the Kansas River to reconstruct environmental histories as a means to assess the proportions of resident and transient individuals. Silver Carp within the Kansas River were predominantly residents (adults = 54%; juveniles = 65%) with the majority of reproduction coming from within the Kansas River itself. These results suggest removal efforts in the Kansas River may be effective means of managing this invasive fish species. Transient individuals exhibited short durations of signatures indicative of the Missouri River (mean percent of data points for adults = 10% and juveniles = 36%), suggesting movements into the Missouri River were brief. These results highlight the importance of connectivity of tributary habitat among large rivers and provides important information for invasive species management.

Bipolar radiofrequency induced thermotherapy and 1064 nm Nd:Yag laser in endovenous occlusion of insufficient veins: short term follow up results

VASA ◽  
2011 ◽  
Vol 40 (3) ◽  
pp. 235-240 ◽  
Author(s):  
Krnic ◽  
Sucic
Keyword(s):  
Side Effects ◽  
Success Rate ◽  
Nd:Yag Laser ◽  
Main Stem ◽  
Short Term ◽  
Main Trunk ◽  
Bipolar Radiofrequency ◽  
Saphenous Veins ◽  
Skin Redness ◽  
Complete Failure

Background: The aim of this study is to report our results in main stem vein closure using the bipolar radiofrequency induced thermotherapy (RFITT) system and the 1064nm Nd:Yag laser. Patients and methods: 44 incompetent main stem veins (37 great saphenous veins, one lesser saphenous vein, and 6 anterior accessory saphenous veins) in 29 patients were treated using RFITT. 53 incompetent main stem veins (45 great saphenous veins, 4 lesser saphenous veins, and 4 anterior accessory saphenous veins) in 43 patients were treated endovenously with 1064 nm Nd:Yag laser. All patients underwent postoperative duplex scanning within a month after procedure, as well as a short interview regarding postoperative discomfort. Results: In main stem veins treated with RFITT, the success rate within the first month was 86,4 % (38 out of 44 veins). Complete failure rate was 13,6 % (6 out of 44 veins). In 53 main stem veins treated by 1064 nm Nd:Yag laser, the success rate was 100 %, consisting of 98,1 % complete success (52/53 veins), and 1,9 % partial success (1/53 veins). None of the patients treated with RFITT experienced postoperative adverse effects, whereas 13/43 (30,2 %) patients treated with laser had to use oral analgesics after the treatment, and 21/43 (48,8 %) patients reported transient skin changes, such as bruising or skin redness. Conclusions: RFITT system was fairly efficient in the short term for closure of main trunk veins, whereas longer term results are still scarce. Postoperative side effects of RFITT were minimal. 1064nm Nd:Yag laser, according to short term results, proved to be very effective for main stem vein closure. Postoperative side effects related to 1064 nm Nd:Yag endovenous laser treatment proved to be minor, transient, and acceptable.

Early onset isolated ostial left-main-stem stenosis after breast cancer radiation report of a case and review of literature

2012 ◽  
Vol 60 (S 01) ◽  
Author(s):  
M Wilbring ◽  
SM Tugtekin ◽  
S Schön ◽  
D Joskowiak ◽  
K Matschke ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Early Onset ◽  
Main Stem ◽  
Review Of Literature ◽  
Left Main ◽  
Left Main Stem

Imaging Features of Nontumorous Conditions Involving the Trachea and Main-stem Bronchi

2002 ◽  
Vol 47 (3) ◽  
pp. 269
Author(s):  
Kyung Nyeo Jeon ◽  
Duk Sik Kang ◽  
Kyung Soo Bae
Keyword(s):  
Main Stem ◽  
Imaging Features

First record of the crystal darter (Crystallaria asprella) from Big River, Missouri, since 1963

2010 ◽  
Vol 44-45 (2010-2011) ◽  
pp. 41-43
Author(s):  
Jeffery M. Ray
Keyword(s):  
Endangered Species ◽  
First Record ◽  
Main Stem ◽  
Jefferson County ◽  
River Drainage

Abstract The capture of a crystal darter Crystallaria asprella, a state endangered species in Missouri, from the main stem of Big River (Meramec River drainage) in August 2009 represented the first documentation of the species in nearly 50 years from Big River, Jefferson County, and only the second record ever reported from this river.

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