Changes in autumn zooplankton in the pelagic zone of Lake Sevan (Armenia) during the increase in fish abundance

Крылов, А. В.; Hayrapetyan, A. O.; Болотов, С. Э.; Gerasimov, Yu. V.; Malin, M. I.; Косолапов, Д. Б.; Hovsepyan, A. A.

doi:10.1134/s1995082916020097

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…m -3 (2013) and 13-40 g m -3 and 60-160 thousand ind. m -3 (2014), respectively (Krylov et al, 2016a). This proliferation of large-bodied zooplankton is considered only possible if the abundance of visually feeding zooplanktivorous fish is low (Brooks andDodson, 1965, Hülsmann et al, 2005).…”

Section: Changes In Land Use Intensity and Eutrophicationmentioning

confidence: 99%

“…4, Hovhanissian, 1994). In the mid-1970s the diversity and biomass of the macrophytes was drastically (Meshkova, 1975;Krylov et al, 2010;Krylov et al, 2016aKrylov et al, , 2016bSimonyan, 1991); phytoplankton, zoobenthos, zooplankton (data of the Scientific Center of Zoology and Hydroecology). reduced.…”

Section: Changes In Land Use Intensity and Eutrophicationmentioning

confidence: 99%

“…Missing data: unavailable. Source: zooplankton(Meshkova, 1975;Krylov et al, 2010;Krylov et al, 2016aKrylov et al, , 2016b Simonyan, 1991); phytoplankton, zoobenthos, zooplankton (data of the Scientific Center of Zoology and Hydroecology).…”

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confidence: 99%

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A review of anthropogenic stressors on Lake Sevan, Armenia

2022

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The resilience of natural systems may be severely compromised by anthropogenic influences. In this paper, the principal anthropogenic influences on the ecosystem of the Armenian highland lake Sevan during the past century are identified. The diversity and severity of the pressures were influenced by national priorities and the catchment's growth. Changes in the lake's morphometry and the littoral's morphology, as well as unsustainable usage of the lake's fish resources, were among the repercussions. They are discussed depending on how each sort of disturbance affects the ecosystem. Although the timing and degree of each stressor were specified, identifying the direct effects of each stressor was often challenging. The current management decisions and future threats to the lake's ecosystem are discussed. This article describes the history of the anthropogenic change of Lake Sevan and, using it as an example, assesses the ecological footprint of people on natural resources and their repercussions.

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Section: Changes In Land Use Intensity and Eutrophicationmentioning

confidence: 99%

Section: Changes In Land Use Intensity and Eutrophicationmentioning

confidence: 99%

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A review of anthropogenic stressors on Lake Sevan, Armenia

2022

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“…It is well-known that Caucasus is an important hotspot of biodiversity and endemism of the terrestrial [Griffin, 1999;Myers et al, 2000;Krever et al, 2001;CEPF, 2018] and freshwater [Katouzian et al, 2016;Parvizi et al, 2019;Marin et al, 2021] animals, but we have no idea if it is true for Cladocera? Again, recent information on the Cladocera of Georgia and Azerbaijan is scarce [Alekhperov, Taptiqova, 2021;Tapdiqova, 2022]; studies of the water fleas of Armenia are more numerous [Krylov et al, 2016;Malin et al, 2021] but lacking any taxonomic revisions. Ciscaucasia (covering several Russian Federation regions) is among inadequately studied territories, although studies on the Cladocera were started there many years ago [Sowinsky, 1891;Schiklejew, 1929;Kalita, 1930: Kudelina, 1930Tauson, 1936] and are continued recently [Dementiev, 2015;Karnaukhov, Zlotnikov, 2017;Bondareva, 2019].…”

Section: Introductionmentioning

confidence: 99%

Cladocera (Crustacea: Branchiopoda) in lowlands of the Ciscaucasian Region, European Russia

Aksenova,

Krolenko,

Kotov

2023

Arthsel

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Парадоксальным образом внимание специалистов по биогеографии кладоцер в России сосредоточено на Арктической зоне, Дальнем Востоке и Сибири, а Кавказ и Предкавказье изучены недостаточно. Целью данного исследования является анализ фауны ветвистоусых ракообразных (Cladocera) низменностей Предкавказья для установления общих закономерностей их распространения, т.е. выявления локальных очагов биоразнообразия региона. Всего проанализирована 171 качественная проба из 155 водоемов, в которых зарегистрировано 57 видов Cladocera. Все таксоны отнесены к следующим географическим фаунистическим комплексам: (1) широко распространенный евразийский (WE), (2) южный тропический (ST), (3) средиземноморско-понто-каспийский эндемичный (EN), ( 4) аридный (AR); и двум искусственным группам: (5) широко распространенные неревизионные таксоны (WS) и (6) восточные (возможно, антропогенные) вселенцы (IS). Распределение фаунистических комплексов между двумя основными биотопами в Тамани и в остальном Предкавказье существенно различается: оно относительно сходно для бентосных + литоральных (BP) видов, но сильно различается для планктонных видов (PL). Среди видов PL в Таманской подобласти доля видов EN, IS и AR значительно выше, а доля WE и WS значительно ниже, чем в остальном Предкавказье. На сегодняшний день у нас нет объяснения подобной специфике Таманского субрегиона. Также мы не можем обсуждать очаги эндемизма Предкавказья и даже Кавказа в отношении Cladocera, ABSTRACT: Paradoxically, attention of experts on cladoceran biogeography is focused in Russia on the Arctic zone, Far East and Siberia, while Caucasus and Ciscaucasia are studied inadequately. The aim of this communication is to analyse the cladoceran fauna of lowlands of the Ciscaucasian Region to determine general regularities of their distribution, i.e. to reveal local biodiversity hotspots of the region. In total, 171 qualitative samples from 155 water bodies are analysed where 57 species of Cladocera are recorded. All taxa are assigned to the following geographic faunistic complexes: (1) widely distributed Eurasian (WE), (2) southern tropical (ST), (3) Mediterranean-Ponto-Caspian endemic (EN), (4) arid (AR) complex; and two artificial groups: (5) widely distributed non-revised taxa (WS) and ( 6) eastern (possibly, anthropogenic) invaders (IS). Distribution of faunistic complexes between two main biotopes in Taman and Other Ciscaucasia is significantly different: it is relatively similar for benthic + littoral (BP) species, but very different among the planktonic species (PL). Among PL species in the Taman sub-region, the portion of EN, IS and AR species is significantly higher and rate of WE and WS is significantly lower as compared to the Other Ciscaucasia. To date we have no explanation for such specificity of the Taman region. Also we cannot discuss the endemism hotspots of the Ciscaucasia and even Caucasus concerning the Cladocera, moreover, no one cladoceran taxon is regarded as an endemic of the Caucasus. The cladoceran studies need to be continued in this region.

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