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West Plains, MO, United States

Michaletz P.H.,500 East Gans Road | Siepker M.J.,51 Joe Jones Boulevard
Transactions of the American Fisheries Society | Year: 2013

Largemouth Bass Micropterus salmoides, SpottedBass M. punctulatus,White CrappiePomoxis annularis, andBlack Crappie P. nigromaculatus are popular components ofmany large reservoir sport fisheries, and a better understanding of these populations and their dynamics would improve our management capabilities. We used long-term datasets (13-37 years) collected from 15 Missouri reservoirs to assess temporal trends and synchrony in sport fish recruitment by using catch per unit effort of age-1 (CPUE1) black bass Micropterus spp. during spring electrofishing (N/h) and CPUE1 of crappies Pomoxis spp. during fall trap-netting (N/net-night) as our index of recruitment. Although CPUE1 exhibited high interannual variation within a reservoir, time series analysis revealed only two significant trends for each of the black bass species, with all trends indicating increasing recruitment. White Crappie CPUE1 showed abrupt declines in all four reservoirs in the Osage River basin, with these declines occurring in different years in each reservoir. White Crappie CPUE1 in one northern reservoir and Black Crappie CPUE1 in all reservoirs appeared to be increasing over time.Within a species, some regional synchrony in CPUE1 occurred for Largemouth Bass, White Crappie, and Black Crappie but not for Spotted Bass. However, synchrony within a species was not universal and in some cases did not exist even among arms within large reservoirs. With few exceptions, there was little evidence for synchronous recruitment among species; those that occurred were among congeners. The lack of synchrony among black bass and crappie recruitment suggests that management practices designed to improve recruitment of one species may not enhance the recruitment of another species. © American Fisheries Society 2013. Source


Siepker M.J.,51 Joe Jones Boulevard | Michaletz P.H.,500 East Gans Road
Transactions of the American Fisheries Society | Year: 2013

Large reservoirs provide important sport fisheries, but managing these fisheries is difficult because of the multiple biological and environmental variables that interact to shape them. Understanding how sport fish recruitment responds to parental stock and environmental influences would improve our management capabilities. We compiled long-term datasets for 15 Missouri reservoirs and used them to examine the influence of parental stock abundance and a suite of environmental variables on the recruitment of Largemouth Bass Micropterus salmoides, Spotted Bass M. punctulatus,White Crappie Pomoxis annularis, and Black Crappie P. nigromaculatus. Comparisons of log-linear, Ricker, and Beverton-Holt stock-recruit models revealed that the log-linear model was the most parsimonious for Largemouth Bass, White Crappie, and Black Crappie, but the Ricker model was best for Spotted Bass. However, stock-recruit models alone explained less than 13% of the variation in Largemouth Bass, Spotted Bass, and White Crappie recruitment while explaining about 33% of the variability in recruitment of Black Crappie. Largemouth Bass recruitment was positively related to spring rises in water levels, summer water levels, and average summer air temperatures, whereas Spotted Bass recruitment was positively related to spring air temperatures. White Crappie recruitment was positively related to total phosphorus levels and drops in spring water levels. Black Crappie recruitment was best explained by the model positively relating recruitment to spawning stock abundance, spring water levels, and summer water levels, while negatively relating recruitment to rapid drops in spring water levels. With the exception of models for Black Crappie, the best models did not include spawning stock abundance, and environmental variables appeared more important in explaining variation in recruitment. However, environmental variables in these models explained only a modest amount of variation (27-44%) in recruitment, revealing the complexity of recruitment processes in large reservoirs. © American Fisheries Society 2013. Source


Siepker M.J.,51 Joe Jones Boulevard | Knuth D.S.,51 Joe Jones Boulevard | Ball E.L.,51 Joe Jones Boulevard | Koppelman J.B.,Columbia College at Missouri
North American Journal of Fisheries Management | Year: 2012

Passive integrated transponder (PIT) tags are used in fisheries evaluations as a means of marking individual fish because they often have high retention rates, can be passively detected, do not affect fish behavior, and typically do not increase the mortality rates of the study fish. One potential limitation of current PIT tag designs is their glass encapsulation, which could be hazardous to humans if inadvertently consumed. In response to these concerns, plastic infusion process (PIP) PIT tags that are fully encapsulated in food-grade polymers have recently been developed. We tested in experimental ponds the retention rates of two PIT tag types (i.e., glass and PIP) implanted into two anatomical locations (i.e., the intraperitoneal cavity and dorsal musculature) in two groups of largemouth bass Micropterus salmoides. Retention of both tag types was excellent, with only one glass tag being expelled during the study. Survival was higher in control fish than in tagged fish; however, tag type and anatomical tagging location did not influence mortality rates of tagged individuals. The mortality of tagged fish in one trial was related to fish size, the larger individuals surviving better in ponds than their smaller conspecifics. Overall, both tag types performed very well in both anatomical tagging locations. We recommend that fisheries personnel consider the new PIP PIT tags if their work involves tagging fish that could be captured and used for human consumption; however, the size of the study specimens could influence their survival. © American Fisheries Society 2012. Source


Siepker M.J.,Illinois Natural History Survey | Ostrand K.G.,Illinois Natural History Survey | Ostrand K.G.,U.S. Fish and Wildlife Service | Ball E.L.,51 Joe Jones Boulevard | And 2 more authors.
North American Journal of Fisheries Management | Year: 2010

Electrofishing is an effective fish capture technique used by many fisheries professionals. Despite the overall effectiveness of the technique, there have been reported negative consequences attributed to its use. We investigated the time to resumption of feeding for adult largemouth bass Micropterus salmoides subjected to electrofishing procedures compared with that for control fish across a range of sizes and water temperatures. Control fish fed immediately, whereas the resumption of feeding was delayed for a short period in electrofished largemouth bass. Time to resumption of feeding was not influenced by temperature but was influenced by largemouth bass size, with larger fish taking longer to resume feeding than smaller conspecifics. Although a single electrofishing event had limited effects on feeding behavior of largemouth bass, fisheries professionals should remain cognizant of other potential negative effects on fishes. © Copyright by the American Fisheries Society 2010. Source


Anderson C.W.,Southern Illinois University Carbondale | Nielsen C.K.,Southern Illinois University Carbondale | Hester C.M.,Southern Illinois University Carbondale | Hubbard R.D.,Southern Illinois University Carbondale | And 2 more authors.
Wildlife Society Bulletin | Year: 2013

Although wildlife biologists need reliable estimates of white-tailed deer (Odocoileus virginianus) density to facilitate management, few studies have examined distance sampling as a density estimation technique for this species. We compared direct (i.e., spotlighting from road transects) and indirect (i.e., counting pellets on randomly placed transects) distance-sampling techniques for estimating deer densities in east-central Illinois, southern Illinois, and northern Michigan (USA) during 2007-2008. Density estimates (95% CI) from indirect distance sampling for northern Michigan, east-central Illinois, and southern Illinois were 6.1-12.7 deer/km2, 11.2-15.8 deer/km 2, and 15.4 deer/km2, respectively. Density estimates from direct distance sampling for northern Michigan, east-central Illinois, and southern Illinois were 18.3- 25.2 deer/km2, 14.4-18.1 deer/km 2, and 19.0 deer/km2, respectively. Although density estimates did not differ between techniques in east-central Illinois and southern Illinois, density estimates derived by direct sampling were slightly higher than those derived by indirect sampling. Estimates of density from direct distance sampling were higher than indirect distance sampling in northern Michigan. The difference in estimates among study areas may be due to landscape-specific differences in the behavioral response of deer to roads and the representativeness of road transects. In landscapes containing more agriculture, roads tend to be systematically distributed and forest edges are independent of road placement, which may explain why both distance-sampling methods provided similar results in Illinois. However, in more forested landscapes such as Michigan, roads tend to follow streams and may provide forest edges that are relatively scarce on the landscape. Deer in forested landscapes may be attracted to roadsides, resulting in higher density estimates not indicative of surrounding forested areas. Therefore, use of road transects for direct distance sampling may be more applicable in non-forested landscapes. © 2013 The Wildlife Society. Source

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