Including independent estimates and uncertainty to quantify total abundance of fish migrating in a large river system: walleye (<i>Sander vitreus</i>) in the Maumee River, Ohio

Pritt, Jeremy J.; DuFour, Mark R.; Mayer, Christine M.; Kočovský, Patrick M.; Tyson, Jeffrey T.; Weimer, Eric J.; Vandergoot, Christopher S.

doi:10.1139/cjfas-2012-0484

Cited by 26 publications

(23 citation statements)

References 39 publications

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“…As an example, conventional wisdom suggests that the open-lake reef stock is the largest component of Lake Erie's adult population, which was estimated as ;27 million in 2011 (WTG 2014). A recent study that focused on the Maumee River spawning stock, estimated abundance to be 651 thousand individuals (Pritt et al 2013), representing 2.4% of the estimated adult population size. The similarity in this value to the average ratio of estimated Maumee River larval walleye production to total larval production (3.6%) over our study periods suggests that the relative magnitude of our larval production estimates are reasonable.…”

Section: Discussionmentioning

confidence: 99%

“…For example, the Maumee and Sandusky rivers flow through watersheds dominated by agricultural land use with low gradients and are subsequently highly responsive to regional temperature fluctuations and extreme precipitation events (Richards 1990;Pritt et al, unpublished manuscript). High variability in temperature and flow regimes in these systems can influence timing of production and larval survival (Mion et al 1998, Crane and Farrell 2013, Pritt et al 2013. The open-lake reef complex is located in relatively shallow water influenced by Maumee and Detroit River discharge, and is responsive to regional temperature fluctuations.…”

Section: System Descriptionmentioning

confidence: 99%

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Portfolio theory as a management tool to guide conservation and restoration of multi‐stock fish populations

et al. 2015

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. 2015. Portfolio theory as a management tool to guide conservation and restoration of multi-stock fish populations. Ecosphere 6(12):296. http://dx.doi.org/10.1890/ES15-00237.1Abstract. Habitat degradation and harvest have upset the natural buffering mechanism (i.e., portfolio effects) of many large-scale multi-stock fisheries by reducing spawning stock diversity that is vital for generating population stability and resilience. The application of portfolio theory offers a means to guide management activities by quantifying the importance of multi-stock dynamics and suggesting conservation and restoration strategies to improve naturally occurring portfolio effects. Our application of portfolio theory to Lake Erie Sander vitreus (walleye), a large population that is supported by riverine and open-lake reef spawning stocks, has shown that portfolio effects generated by annual inter-stock larval fish production are currently suboptimal when compared to potential buffering capacity. Reduced production from riverine stocks has resulted in a single open-lake reef stock dominating larval production, and in turn, high inter-annual recruitment variability during recent years. Our analyses have shown (1) a weak average correlation between annual river and reef larval production (q ¼ 0.24), suggesting that a natural buffering capacity exists in the population, and (2) expanded annual production of larvae (potential recruits) from riverine stocks could stabilize the fishery by dampening inter-annual recruitment variation. Ultimately, our results demonstrate how portfolio theory can be used to quantify the importance of spawning stock diversity and guide management on ecologically relevant scales (i.e., spawning stocks) leading to greater stability and resilience of multi-stock populations and fisheries.

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Section: Discussionmentioning

confidence: 99%

Section: System Descriptionmentioning

confidence: 99%

Portfolio theory as a management tool to guide conservation and restoration of multi‐stock fish populations

et al. 2015

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“…For example, biological samples obtained from gillnetting or electrofishing can be used to allocate abundance estimates from hydroacoustic counts to species (e.g., Tarbox and Thorne, 1996;Pritt et al, 2013;Rudstam et al, 2013;Hughes and Hightower, 2015). Alternatively, a more highly controlled sampling regime can be instituted by counting fish as they move past barriers (e.g., weirs or dams) and by collecting biological samples or data from some portion of the fish in order to partition counts (e.g., Wagner, 2007;Campbell et al, 2012).…”

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confidence: 99%

“…After the construction of hydroelectric dams on the Columbia and Snake rivers during the late 1960s and early 1970s, the abundance and survival of steelhead in the Snake River decreased (Raymond, 1988). In response, steelhead within the Snake River basin were listed as threatened under the Endangered Species Act in 1997.…”

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Abundance estimates and confidence intervals for the run composition of returning salmonids

Steinhorst¹,

Copeland²,

Ackerman³

et al. 2016

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Abstract-In 2-stage fishery sampling, abundance is often estimated by using a primary sampling gear and total abundance is then partitioned into groups of interest by applying data on composition derived from a secondary sampling gear. However, the literature is sparse on statistical properties of estimates of run composition. We examined the accuracy and precision of estimators of composition of wild steelhead (Oncorhynchus mykiss) in the Snake River, in the Pacific Northwest. We simulated estimators, using pooled and time-stratified data. We compared confidence intervals (CIs) determined on the basis of asymptotical normality or a 2-stage bootstrap method. Stratified estimators were unbiased, except in a few cases. Joint CIs (all groups considered simultaneously) had coverages near nominal. Conversely, pooled estimators performed poorly; the proportion of biased estimates increased as the number of groups estimated increased. Using empirical data, we show that CIs met precision goals for most groups. Half-widths of CIs decreased and stabilized as the number sampled and group abundance increased. In complex scenarios, estimates of small groups will yield poor precision and some may be biased, but a stratified estimate with a conservative joint CI can be of practical use. The 2-step bootstrap approach is flexible and can incorporate other sources of variability or sampling constraints.

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“…The first steps are determining habitat utilization patterns (McDowall 1999) and quantifying species' movements between habitats (Pritt et al 2013). However, changes in movement patterns do not directly translate to changes in population persistence.…”

Section: Introductionmentioning

confidence: 99%

Conserving migratory species under human impacts and climate change

Lin¹

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Migratory species use multiple habitats types and ecosystems to complete their life cycles, which exposes them to multiple human-caused stressors along their migratory routes. Overexploitation, habitat degradation, invasive species and connectivity loss have contributed to the decrease of migratory fishes globally in particular diadromous fishes that migrate between marine and freshwater systems. Therefore, understanding the joint impacts from anthropogenic disturbances and climate change on different habitats (e.g., both feeding and spawning grounds) and habitat connectivity (e.g., migration routes) is important for conserving migratory fish.Management will be most effective when management scales match ecological scales. This is particularly important for conserving migratory species, because of the requirement of multiple connected habitats that may cross local management boundaries. The main goals of this Ph.D. thesis are to quantify the impacts of multiple stressors on migratory fish species and prioritize management actions for conserving populations (chapters 2 & 3), species (chapter 4), and communities (chapter 5).A central challenge for managing diadromous fishes (species that migrate between freshwater and saltwater ecosystems) is to quantify increases in population persistence from actions that improve connectivity or reduce fishing mortality. In chapter 2, I used a population dynamic model and fish movement data to predict the interactive impacts of fishing pressure and connectivity loss by human modification of river flows on Australian bass Percalates novemaculeata. Then, in chapter 3, the monetary cost of management actions which included seasonal closures and restoring connectivity, were included in the model to find the most cost-effective way to conserve this fish population. The results reveal that the cost-effectiveness of management actions may vary with river flow and fishing pressure before implementing management actions, and implementation times. The spatiotemporal dynamics of how fish species and key resource users (i.e., anglers) respond to management actions can influence the effectiveness of management strategies. Flexible management plans and increased cooperation between water and fishery managers can be used to achieve the most effective balance between conserving migratory fish populations and minimising cost.Migratory species are particularly vulnerable to climate change as they occupy different ecosystems, as well as transitional habitat which are all impacted by climate change differently.Anthropogenic barriers can further reduce the ability of species to respond to a shifting climate. In ii chapter 4, I assessed the impact of climate change on the distribution of a migratory fish species, Australian grayling Prototroctes maraena, and how it affected priorities for restoring connectivity. I found climate change moves at different rates in marine and freshwater systems, decoupling the habitats used by grayling. In addition, the changing spatial distribution of suitable ...

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Including independent estimates and uncertainty to quantify total abundance of fish migrating in a large river system: walleye (Sander vitreus) in the Maumee River, Ohio

Cited by 26 publications

References 39 publications

Portfolio theory as a management tool to guide conservation and restoration of multi‐stock fish populations

Portfolio theory as a management tool to guide conservation and restoration of multi‐stock fish populations

Abundance estimates and confidence intervals for the run composition of returning salmonids

Conserving migratory species under human impacts and climate change

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