Zooplankton community emerging from fresh and saline wetlands

Toruan, Reliana Lumban

doi:10.2478/v10104-012-0003-5

Cited by 12 publications

(11 citation statements)

References 29 publications

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“…It is important to note, however, that variations in the water level may lead to changes in several environmental variables that will likely stimulate resting eggs production in permanent environments. For example, changes in salinity might be frequent and intense in coastal lagoons (Esteves et al, 2008), possibly acting as cues to induce diapause, since few freshwater species are salt tolerant (Brock and Shiel, 1983;Sarma et al, 2006;Toruan, 2012). In general, resting eggs Hence, it is possible that resting egg banks from the studied lagoons and pools are indeed impoverished.…”

Section: Discussionmentioning

confidence: 99%

Zooplankton resting egg banks in permanent and temporary tropical aquatic systems

Araújo¹,

Lopes²,

Santangelo³

et al. 2013

Acta Limnol. Bras.

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Aim: We evaluated zooplankton resting egg banks and active communities in five coastal lagoons and in five temporary pools, aiming to compare the active and the dormant communities in such environments. As they differ in hydroperiod, we expected that pools present richer resting egg banks in comparison to those found in lagoons. Methods: Zooplankton community was sampled twice in 2006 (lagoons) and in 2010 (pools) and resting egg banks were sampled once in December 2007 (lagoons) and in May 2010 (pools). Resting eggs were isolated from the sediment by applying the sugar flotation method. Results: In opposition to our expectation, species richness in the resting egg banks of pools did not differ from those of lagoons. Additionally, no difference was found between the active and the dormant zooplankton communities in each water body for both temporary and permanent environments. However, similarity between active and dormant communities was greater in permanent environments than it was in temporary environments. Conclusions: It seems that the diapause strategy observed in certain tropical zooplankton populations cannot be predicted based on the awareness of the environment type (permanent or temporary), since hatching cues may be species-specific.

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Section: Discussionmentioning

confidence: 99%

Zooplankton resting egg banks in permanent and temporary tropical aquatic systems

Araújo¹,

Lopes²,

Santangelo³

et al. 2013

Acta Limnol. Bras.

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“…Rapid salinity regime shifts could, accordingly, have drastic impacts on wetland biota, even inhibiting the viability of resting eggs or dormant life history stages. Indeed, loss of invertebrate diversity under salinisation has been reported in many studies (Atashbar et al., ; Nielsen et al., ; Toruan, ), and the loss of mature zooplankton due to the breaching of salinity thresholds may have profound implications for the reproductive success and persistence of populations under environmental change. Furthermore, in addition to direct lethal effects, salinity increases may have indirect effects that impact wetland biota across different life history stages (Hintz & Relyea, ), and this necessitates further examination, alongside other environmental context‐dependencies.…”

Section: Discussionmentioning

confidence: 97%

Combined impacts of warming and salinisation on trophic interactions and mortality of a specialist ephemeral wetland predator

et al. 2019

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Wetlands are of enormous importance for biodiversity globally but are under increasing risk from multiple stressors driven by ongoing anthropogenic environmental change. As the trophic structure and dynamics of ephemeral wetlands are poorly understood, it is difficult to predict how these biodiverse ecosystems will be impacted by global change. In particular, warming and salinisation are projected to have profound impacts on these wetlands in future. The present study examined the combined effects of warming and salinisation on species interaction strengths and mortality rates for two ephemeral wetland species. Using an ephemeral pond specialist copepod, Lovenula raynerae Suárez‐Morales, Wasserman, & Dalu, (2015) as a model predator species, we applied a functional response approach to derive warming and salinisation effects on trophic interactions with a prey species. Furthermore, the effects of a salinisation gradient on mortality rates of adult copepods were quantified. The predatory copepod exhibited type II functional responses towards larval Culex pipiens mosquito prey, owing to high predation rates at low prey densities. Increased temperatures generally resulted in greater predator feeding rates, whilst increased salinities reduced consumption. However, the effects of temperature and salinity interacted: temperature effects on functional responses were suppressed under heightened salinities. Substantial mortality was observed in both male and female adult L. raynerae at salinity levels exceeding 10 parts per thousand. Warming and salinisation substantially altered interaction strengths in ephemeral wetland ecosystems, with implications for ecosystem function and stability. Furthermore, we demonstrated salinisation thresholds for mortality in an ephemeral wetland specialist, showing that salinisation may threaten the persistence of endemic species. The ongoing effects of warming and salinisation may therefore interact to alter trophic dynamics and species composition in ephemeral wetlands. These stressors should be considered synergistically within management practices.

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“…In the Llancanelo-wetland system, certain Brachionus species and cyclopoid copepods could possibly expand their predominance spatially and temporally under such conditions. As has been indicated in other aquatic ecosystems in the world (Brucet et al 2009a, b), global warming will possibly also effect an increase in the salinity of the springs and the lotic environments within the Llancanelo basin so as to cause losses in zooplankton biodiversity as a result of the consequent reduction in the viability and longevity of the egg banks of certain freshwater species within the sediments (Nielsen et al 2003;Nielsen and Brock 2009), thus promoting the replacement of those species by euryhaline and eurythermal biota (Toruan 2012) having preferences for high temperatures and salinity-i.e., certain species of Brachionus or B. poopoensis (De los Ríos and Crespo 2004;De los Ríos 2005).…”

Section: The Zooplankton Communitymentioning

confidence: 93%

Zooplankton diversity of a protected and vulnerable wetland system in southern South America (Llancanelo area, Argentina)

2016

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In arid regions, climatic conditions exert a great control on the aquatic systems present, but recent changes in climate have produced an enhanced salinization of the aquatic environments located there. Consequently, a major reduction in biodiversity would be expected in those wetlands that were originally fresh water. Salinity is a principal cause of reduced biodiversity particularly in zooplankton because few of those species can adapt to the salt pressure of saline environments. Therefore, the aim of this study was to gain essential information on the diversity of aquatic invertebrates in Llancanelo basin by focussing the analysis on the zooplankton community and exploring seasonal and spatial differences in the zooplankton assemblages of this vulnerable wetland system within an arid region of Argentina. Seasonal samples were taken at nine sites in the basin (a shallow lake, 4 springs, streams, and the Malargüe River). A total of 45 species were identified. The zooplankton abundance in the lake displayed a clear seasonal contrast and was higher than that recorded in the springs and lotic environments. Boeckella poopoensis, Fabrea salina, and Brachionus plicatilis predominated in the lake, indicating their halophilia. The presence of the crustaceans Alona sp., Macrocyclops albidus, and Paracyclops fimbriatus was restricted to the springs; whereas Notholca labis and Notholca squamula were found only in running water. The zooplankton species richness in the Llancanelo area is low because of both the salt content in the lake and the irregularity of freshwater entry in all locations during the annual cycle.

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Zooplankton community emerging from fresh and saline wetlands

Cited by 12 publications

References 29 publications

Zooplankton resting egg banks in permanent and temporary tropical aquatic systems

Zooplankton resting egg banks in permanent and temporary tropical aquatic systems

Combined impacts of warming and salinisation on trophic interactions and mortality of a specialist ephemeral wetland predator

Zooplankton diversity of a protected and vulnerable wetland system in southern South America (Llancanelo area, Argentina)

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