Strong biopollution in the southern Caspian Sea: the comb jelly Mnemiopsis leidyi case study

Pourang, Nima; Eslami, F.; Saravi, Hassan Nasrollahzadeh; Fazli, Hasan

doi:10.1007/s10530-016-1171-9

Cited by 14 publications

(9 citation statements)

References 16 publications

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“…The environment in the Caspian Sea has been changed significantly during the past decades in response to impacts of various factors, such as sea level fluctuations, pollution (Ivanov et al., ), and especially introduction of exotic species (Ctenophora, Mnemiopsis leidyi ) which first observed in November 1999 (Ivanov et al., ). The new invasive species affected all component of the sea (Pourang et al., ). It affected the distribution and abundance of plankton species (Kideys & Moghim, ; Roohi et al., ), pelagic species stocks (Daskalov & Mamedov, ; Fazli et al., , ) and demersal feeder fish stocks (Fazli et al., , , ).…”

Section: Discussionmentioning

confidence: 99%

“…Despite the economic and ecological importance of Russian sturgeon as one of the major commercial sturgeon species in the southern Caspian Sea, no adequate information about age, growth, mortality, especially age at first capture, length and age at maturity and stock assessment of the fish in the Caspian Sea has been published. Such information is especially important because of the ecological changes that affected all components of the ecosystem, especially on stocks of pelagic and demersal feeder fishes in the Caspian Sea (Daskalov & Mamedov, ; Fazli, Daryanabard, Abdolmaleki, & Bandani, ; Fazli, Ghaninejad, Janbaz, & Daryanabard, ; Fazli, Zhang, Hay, & Lee, ; Fazli et al., , ; Pourang, Eslami, Nasrollahzadeh Saravi, & Fazli, ). The objectives of this investigation were to fill the basic population biology parameters such as age, growth, age at first capture and maturity and to estimate the biomass of Russian sturgeon in the southern Caspian Sea based on the estimated parameters during the years 1990–2009.…”

Section: Introductionmentioning

confidence: 99%

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Population ecological parameters and stock assessment of Russian sturgeonAcipenser gueldenstaedtiBrandt & Ratzeburg, 1833 in the Southern Caspian Sea

et al. 2018

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Russian sturgeon (Acipenser gueldenstaedti Brandt & Ratzeburg, 1833) is one of the major commercial sturgeon species, but there is no adequate information and previous‐published about population dynamics and stock assessment of this species in the southern Caspian Sea. This paper examines the age structure, growth parameters, maturity, age at first capture, optimum length, natural and fishing mortality and amount of biomass in the southern Caspian Sea (Iranian waters), during a two decades time series period from 1990–1991 to 2008–2009. For a pooled data, the growth parameters were estimated as L∞ = 214.0 cm, K = 0.054, t0 = −4.5 year. Size at fifty percent sexual maturity was at FL = 118 cm for females and 113 cm for males. The age at first capture (tc) estimated to be 12.1 years. In the catch composition, bulk of the catch (75%) belonged to 13–17 years old. The instantaneous coefficient of natural mortality (M) was estimated as 0.120 year−1 and the instantaneous coefficient of fishing mortality (F) varied during the 19‐year period between 0.130 to 0.505 year−1. The biomass showed a descending trend from 1,941.2 mt in 1990–1991 collapsed to about 55 mt in 2004–2005, and then decreased to the lowest level and represented 18.5 mt in 2008–2009. The result revealed that, the stock of Russian sturgeon is being over‐fished. We concluded that to manage the sturgeons stocks, a coordinated regional and international effort are needed to provide immediate implementation of stock enhancement and management in the Caspian Sea.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Population ecological parameters and stock assessment of Russian sturgeonAcipenser gueldenstaedtiBrandt & Ratzeburg, 1833 in the Southern Caspian Sea

et al. 2018

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“…Besides fish, unintentional introductions of other invasive organisms into ancient lakes have also been common and may threaten their biodiversity or alter ecosystem functions. In the Caspian Sea, an invasive ctenophore, Mnemiopsis leidyi , has been associated with large changes to the lower food web and the collapse of economically important sprat fishery (Pourang et al ). The invasive Asian clam ( Corbicula fluminea ) has made its way to Lake Tahoe where it is suspected of stimulating nuisance growth of benthic algae through nutrient excretion (Forrest et al ).…”

Section: Species Introductionsmentioning

confidence: 99%

“…into Lake Victoria may be the best documented and most ecologically and socially impactful intentional species introduction in an ancient lake. All four species were introduced into Lake Victoria in the 1950s and 1960s by the British colonial authorities in Uganda to improve the fishery of the lake, which previously relied on endemic haplochromine cichlids and tilapias (Hall and Mills 2000;Pringle 2005). Nile perch, a voracious piscivore, decimated the endemic fish community, leading to the disappearance of more than half of the lake's 500 endemic cichlid species and large alterations to community and foodweb structure in the lake (Ogutu-Ohwayo 1990;Hall and Mills 2000).…”

Section: Species Introductionsmentioning

confidence: 99%

Recent ecological change in ancient lakes

Hampton

McGowan

Ozersky

et al. 2018

Limnology & Oceanography

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Ancient lakes are among the best archivists of past environmental change, having experienced more than one full glacial cycle, a wide range of climatic conditions, tectonic events, and long association with human settlements. These lakes not only record long histories of environmental variation and human activity in their sediments, but also harbor very high levels of biodiversity and endemism. Yet, ancient lakes are faced with a familiar suite of anthropogenic threats, which may degrade the unusual properties that make them especially valuable to science and society. In all ancient lakes for which data exist, significant warming of surface waters has occurred, with a broad range of consequences. Eutrophication threatens both native species assemblages and regional economies reliant on clean surface water, fisheries, and tourism. Where sewage contributes nutrients and heavy metals, one can anticipate the occurrence of less understood emerging contaminants, such as pharmaceuticals, personal care products, and microplastics that negatively affect lake biota and water quality. Human populations continue to increase in most of the ancient lakes’ watersheds, which will exacerbate these concerns. Further, human alterations of hydrology, including those produced through climate change, have altered lake levels. Co‐occurring with these impacts have been intentional and unintentional species introductions, altering biodiversity. Given that the distinctive character of each ancient lake is strongly linked to age, there may be few options to remediate losses of species or other ecosystem damage associated with modern ecological change, heightening the imperative for understanding these systems.

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“…An example is Mnemiopsis leidiy, a comb jellyfish that originated in the Atlantic Ocean and reached the Caspian Sea in 1998 (Shiganova, 2010). This species caused the sharp decline of fish catches in Iran, as it competes with commercially used fish for food resources and preys on their eggs (Roohi et al, 2010(Roohi et al, , 2016Pourang et al, 2016). The highest impact of invasive species can be seen in the middle and southern Caspian Sea, which are ecologically more similar to the native marine ecosystems of many introduced species (Shiganova, 2010).…”

Section: Contribution Of Individual Pressures To the Cumulative Pressmentioning

confidence: 99%

Differential impact of anthropogenic pressures on Caspian Sea ecoregions

Lattuada

Albrecht

Wilke

2019

Marine Pollution Bulletin

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Over the past decades, overall ecological conditions in the Caspian Sea have deteriorated. However, a comprehensive understanding of lake-wide spatial differences in anthropogenic pressures is lacking and the biological consequences of human impacts are poorly understood. This paper therefore aims at assessing the individual and combined effects of critical anthropogenic pressures on the Caspian Sea ecoregions. First, cumulative pressure scores were calculated with a cumulative environmental assessment (CEA) analysis. Then, the individual contribution of anthropogenic pressures was quantified. Finally, ecoregion-specific differences were assessed. The analyses show that both cumulative and individual pressure scores are unevenly distributed across the Caspian Sea. The most important individual pressures are invasive species, chemical pollution and poaching. This uneven distribution of pressure scores across Caspian Sea ecoregions creates new challenges for future conservation strategies, as different ecoregions usually require different conservation measures.

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Strong biopollution in the southern Caspian Sea: the comb jelly Mnemiopsis leidyi case study

Cited by 14 publications

References 16 publications

Population ecological parameters and stock assessment of Russian sturgeonAcipenser gueldenstaedtiBrandt & Ratzeburg, 1833 in the Southern Caspian Sea

Population ecological parameters and stock assessment of Russian sturgeonAcipenser gueldenstaedtiBrandt & Ratzeburg, 1833 in the Southern Caspian Sea

Recent ecological change in ancient lakes

Differential impact of anthropogenic pressures on Caspian Sea ecoregions

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