Population viability analysis of white sturgeon and other riverine fishes

Jager, Henriëtte I.; Lepla, K.; Chandler, James Angus; Bates, P.; Winkle, W. Van

doi:10.1016/s1462-9011(00)00063-0

Cited by 16 publications

(20 citation statements)

References 10 publications

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“…Most sturgeon PVAs have been based on agestructured models, and except for few examples of IBM applications (Jager et al 2000Jager 2001Jager , 2005Jager , 2006a, sturgeon PVAs have mostly lacked considerations of demographic and environmental stochasticity and genetics (Jarić et al 2009b). The majority of models applied to sturgeons so far have been developed specifically for the purpose, and the software packages for IBMs, such as Vortex, have not been used previous to this study.…”

Section: Discussionmentioning

confidence: 99%

“…The stocking scenarios within the present study have not dealt with the important question of the effect of supportive stocking on the inbreeding (and outbreeding) depression (Ludwig 2006), and there is a need for wider use of genetic models which could provide information on the costs and benefits of supplementing fish populations with hatchery-reared stock (Jager et al 2000). As claimed by Hedrick (2002), effective population size of fish species with a high number of offspring can be surprisingly small, since there is a large variance in contribution to the next generation, which is even more visible in supportive stocking, when few adults are used to produce a large number of stocked individuals.…”

Section: Discussionmentioning

confidence: 99%

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Population viability analysis of the Danube sturgeon populations in a Vortex simulation model

Jarić¹,

Ebenhard

Lenhardt³

2009

Rev Fish Biol Fisheries

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Populations of six sturgeon species in the Danube River (beluga, Russian sturgeon, stellate sturgeon, sterlet, ship sturgeon and Atlantic sturgeon) have experienced severe decline during the last several decades, mostly due to the unsustainable fishery, river fragmentation and water pollution. Present lack of knowledge on basic sturgeon demography, life history and relative effects of different negative factors is further hindering implementation of efficient policy and management measures. In the present study, population viability analysis in a Vortex simulation model has been conducted in order to assess the state of the six Danube sturgeon species, their future risk of extinction and to determine the most suitable conservation and management measures. Population viability analysis has revealed a large sensitivity of the Danube sturgeon populations to changes in the natural mortality, fecundity, age at maturity and spawning frequency. It was also confirmed that the sturgeons are highly susceptible to even moderate levels of commercial fishery, and that their recovery is a multi-decadal affair. Stocking with adult individuals was shown to produce considerably greater effect on population persistence than stocking with juveniles, but the latter approach is probably still preferable since it avoids many inherent problems of aquaculture cultivation. This study represents the first population viability analysis of the Danube sturgeons.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Population viability analysis of the Danube sturgeon populations in a Vortex simulation model

Jarić¹,

Ebenhard

Lenhardt³

2009

Rev Fish Biol Fisheries

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“…The middle Snake River, from Lower Granite Reservoir to the natural barrier at Shoshone Falls, contains several discrete white sturgeon populations that are segmented by dams (Figures 1 and 5; Cochnauer et al, 1985;Jager et al, 2000Jager et al, , 2001Jager, 2002;Idaho Power, 2002). This region has been studied by students at the University of Idaho (Coon et al, 1977;Cochnauer, 1983;Lepla, 1994), the Idaho Fish and Game Department (Cochnauer et al, 1985), the Nez Perce tribe (Hoefs, 1997), and as part of the relicensing of Idaho Downloaded by [University of Saskatchewan Library] at 02:59 27 December 2014 Power Company's several dams (Idaho Power, 2002).…”

Section: G Middle Snake River Idahomentioning

confidence: 99%

“…Vertical lines indicate dam locations, shaded areas indicate reservoir habitat, and clear areas indicate free-flowing river habitat. FromJager et al (2000).…”

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confidence: 99%

A Riparian Habitat Hypothesis for Successful Reproduction of White Sturgeon

Coutant

2004

Reviews in Fisheries Science

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White sturgeon (Acipenser transmontanus) has recruitment failure or severe interannual variability in much of its range. Exceptions are Columbia River below Bonneville Dam, Snake River below Hells Canyon Dam, lower Fraser River, and Sacramento River. Since rivers were impounded or flows regulated, once-continuous populations now isolated by natural barriers or dams often have not reproduced successfully, despite successful spawning events. Research has not adequately explained recruitment failures or why certain populations are successful. This paper proposes that submerged riparian habitat during seasonal high water is needed for early development. Where recruitment is successful, channels are complex and floodable riparian vegetation or rocky substrate is abundant. There, spawning occurs in turbulent zones upstream (1-5 km) of seasonally submerged riparian habitat, eggs can disperse into inundated habitat and adhere to newly wetted surfaces for incubation, yolk-sac larvae can move to riparian crevices for prefeeding development, feeding larvae have food-rich flooded habitat for early growth, and larvae can transition to juveniles as water recedes to permanent channels. Such habitat is lacking where recruitment is low and present only in high-flow years where recruitment is sporadic. These observations suggest that management should rehabilitate riparian zones and provide high river flows during spawning to stimulate natural recruitment.

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“…Many argue that while inbreeding depression may not be the driving force towards extinction, inbreeding increases the risk of extinction (Mills and Smouse 1994). Therefore, a need exists to explore the relationship between demographics and genetics in regards to the long-term persistence of populations (Boyce 1992;Jager et al 2000;Kirchner et al 2006), particularly for long-lived species such as the lake sturgeon, Acipenser fulvescens. Focusing on long-lived species is especially important, since much of the research has focused on shorter-lived species with special assumptions (e.g., nonoverlapping generations), and longevity of a species likely provides a buffer against inbreeding, allele loss, and increased extinction risks for a population.…”

Section: Introductionmentioning

confidence: 99%

Minimum viable population size for lake sturgeon (Acipenser fulvescens) using an individual-based model of demographics and genetics

Schueller

Hayes

2011

Can. J. Fish. Aquat. Sci.

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Population viability analysis is a useful tool to explore the relationship between extinction risk and population size, but often does not include genetic factors. Our objectives were to determine minimum viable population size (MVP) for lake sturgeon (Acipenser fulvescens) and examine how inbreeding depression may affect MVP. Our individual-based model incorporated inbreeding depression in two ways: individuals with inbreeding coefficients above a threshold experienced inbreeding depression (threshold), and individuals experienced inbreeding depression at a rate related to their inbreeding coefficient (gradual). Three mechanisms relating inbreeding to fitness were explored (young-of-the-year (YOY) viability, post-YOY viability, number of progeny). The criterion we used to determine MVP was a 5% chance of extinction over 250 years. The estimated MVP without inbreeding effects was 80 individuals. For some scenarios incorporating inbreeding, MVP did not change, but for others, MVP was substantially higher, reaching values up to 1800. Results demonstrate that extinction risk and MVP can be influenced by both demographic stochasticity and inbreeding depression. This research should inform management by determining MVP and how inbreeding, which is expected to accrue in remnant populations because of generations of low abundance, may affect MVP.Résumé : L'analyse de la viabilité d'une population est un outil utile pour explorer la relation qui existe entre le risque d'extinction et la taille d'une population, mais souvent elle n'inclut pas les facteurs génétiques. Nos objectifs sont de déter-miner la taille minimale viable de la population (MVP) chez l'esturgeon jaune (Acipenser fulvescens) et l'effet potentiel de la dépression endogamique sur la MVP. Notre modèle basé sur l'individu incorpore la dépression endogamique de deux façons : les individus qui possèdent un coefficient d'endogamie au-dessus d'un certain seuil connaissent une dépression endogamique (seuil) et les individus connaissent une dépression endogamique à un taux proportionnel à leur coefficient d'endogamie (gradient). Nous avons exploré trois mécanismes qui relient l'endogamie à la fitness (la viabilité des jeunes de l'année (YOY), la viabilité après le stade YOY et le nombre de rejetons). Le critère que nous utilisons pour déterminer la MVP est une probabilité d'extinction de 5 % sur 250 ans. La MVP estimée sans les effets de l'endogamie est de 80 individus. Dans certains scénarios qui incorporent l'endogamie, MVP ne change pas, mais dans d'autres, la MVP est beaucoup plus élevée, pouvant atteindre des valeurs de l'ordre de 1800. Nos résultats démontrent que le risque d'extinction et la MVP peuvent être influencés par à la fois la stochasticité démographique et la dépression endogamique. Notre recherche devrait fournir des renseignements pour la gestion en déterminant la MVP et en montrant comment l'endogamie, qu'on s'attend à voir augmenter dans les populations résiduelles à cause de générations de faible abondance, peut affecter la MVP.[Traduit par ...

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Population viability analysis of white sturgeon and other riverine fishes

Cited by 16 publications

References 10 publications

Population viability analysis of the Danube sturgeon populations in a Vortex simulation model

Population viability analysis of the Danube sturgeon populations in a Vortex simulation model

A Riparian Habitat Hypothesis for Successful Reproduction of White Sturgeon

Minimum viable population size for lake sturgeon (Acipenser fulvescens) using an individual-based model of demographics and genetics

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