Past and current status of sturgeons in the upper and middle Danube River

Hensel, Karol; Holčík, Juraj

doi:10.1007/0-306-46854-9_9

Cited by 43 publications

(54 citation statements)

References 13 publications

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“…More recently, water quality conditions in many regions have improved (Hensel & Holcik 1997, Schram et al 1999, Kampa et al 2014) and stricter harvest controls have been implemented (Khodorevskaya et al 1997, Baker & Borgeson 1999, Peterson et al 2007) in addition to the enforcement of import restrictions on many sturgeon species through the Convention on International Trade in Endangered Species (Williamson 2003, Lenhardt et al 2006, Ludwig 2006. However, poaching purportedly remains a conservation concern for all sturgeon species, given the exorbitant prices of caviar (Cohen 1997, Pikitch et al 2005; this seems to be especially relevant for European stocks (Khodorevskaya et al 1997, Ivanov et al 1999, Ludwig 2006).…”

Section: Recent Improvements and Continued Threatsmentioning

confidence: 99%

A global perspective of fragmentation on a declining taxon—the sturgeon (Acipenseriformes)

Haxton¹,

Cano²

2016

Endang. Species. Res.

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Acipenseriformes (sturgeons and paddlefishes) are considered to be one of the most globally imperiled taxon, with 25 of the 27 species listed by the International Union for the Conservation of Nature (IUCN). Overharvest, habitat degradation, fragmentation and water quality issues have contributed to their decline worldwide. These stressors have been ameliorated in some areas, but in others they remain a limiting factor to sturgeon. Barriers impeding upstream migrations to natural spawning areas and manifesting alterations to natural flows continue to compromise sturgeon recruitment and limit natural recovery. Watersheds in the Northern Hemisphere have been categorized as being strongly affected, moderately affected or unaffected based on the degree of fragmentation and water flow regulation. An overlay (i.e. intersect) of the sturgeons' status with this watershed categorization revealed that a small area remains in which sturgeon are not considered at risk and where rivers are unaffected in northern Canada. These relatively unperturbed populations provide a much needed opportunity to learn about sturgeon biology, habitat needs and reproductive potential in a natural riverine environment, which may facilitate conservation and recovery efforts in affected watersheds.

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Section: Recent Improvements and Continued Threatsmentioning

confidence: 99%

A global perspective of fragmentation on a declining taxon—the sturgeon (Acipenseriformes)

Haxton¹,

Cano²

2016

Endang. Species. Res.

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“…A dramatic decline of its catches, as a consequence of overfishing, started as early as the 16 t h c e n t u r y. The last specimens weighing 140 and 150 kg in this segment of the Danube were caught at Vojka (r.km 1837) and Stúrovo (r. k m 1719) in 1910 and 1925 respectively (Khin 1957, Balon, 1967a, Holcík, 1995b, Hensel & Holcík 1997). …”

Section: Species Diversity and Equitabilitymentioning

confidence: 99%

Changes in the fish fauna and fisheries in the Slovak section of the Danube River: a review

Holčík

2003

Ann. Limnol. - Int. J. Lim.

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“…This species inhabits Black, Caspian and Aral Sea basins, and it is considered as critically endangered throughout its range (Gessner et al, 2010). It was once commonly recorded in the Danube (Hensel and Holčik, 1997) but since the mid-1950s the population has been severely depleted by a combination of factors and there is concern that it has failed to reproduce over a prolonged period (Jarić et al, 2009;Gessner et al, 2010). Due to a lack of systematic monitoring, the ship sturgeon population in the Danube River is known only through a small number of chance sightings and drawing conclusions about its population status is challenging.…”

Section: Applicationmentioning

confidence: 99%

Inferring functional extinction based on sighting records

Jarić

Geßner

Solow

2016

Biological Conservation

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The term functional extinction is used to describe a permanent failure of reproduction or recruitment in a population. Functional extinction results in a truncation of the age distribution, but this can be very difficult to detect in poorly studied populations. Here, we describe a novel statistical method for detecting functional extinction based on a sighting record of individuals of known or estimated ages. The method is based on a simple population dynamics model and simulation results show that it works well even with limited data. The method is illustrated using a sighting record of the ship sturgeon (Acipenser nudiventris) in the Danube River. The results indicate that this population is functionally extinct, most likely by 2002. Management implications of this finding are discussed.

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Past and current status of sturgeons in the upper and middle Danube River

Cited by 43 publications

References 13 publications

A global perspective of fragmentation on a declining taxon—the sturgeon (Acipenseriformes)

A global perspective of fragmentation on a declining taxon—the sturgeon (Acipenseriformes)

Changes in the fish fauna and fisheries in the Slovak section of the Danube River: a review

Inferring functional extinction based on sighting records

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