Effects of anoxia on the viability of subitaneous eggs of planktonic copepods

Marcus, Nancy H.; Lutz, R. V.

doi:10.1007/bf00349476

Cited by 46 publications

(14 citation statements)

References 23 publications

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“…Marcus and Lutz (1994) found that thirty two days of full anoxia limits the survival of newly spawned calanoid eggs of Labidocerca aestiva to 50%, whereas Acartia tonsa and Centropages hamatus have only 50% hatching success in oxygen <0.086 mg/l for more than 12 days. When eggs of these species were exposed to either anoxia or anoxia plus sulphide through 32 days, no significant difference was observed in the mortality of eggs exposed to anoxia plus sulphide compared to anoxia alone, Marcus et al (1997).…”

Section: Discussionmentioning

confidence: 97%

Zooplankton of a flooded opencast sulphur mine

Żurek

2005

Aquat Ecol

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The zooplankton community of a flooded opencast sulphur mine was investigated during two years. The complicated physical and chemical relationships in this water-filled pit caused an atypical plankton assemblage. At the time of the investigation 20 species of rotifers, 6 of Cladocera, and 8 species of Copepoda were found. A single Ostracod and Chaoborus flavicans were also noted in the samples. Usually the epilimnion was monopolised by rotifers whereas the hypolimnion had a more diversified assemblage of rotifers, cladocerans and copepods. The result of clustering analysis indicated that each predator was associated with its own group of prey. Discrimination analyses showed weak seasonal differences in the zooplankton and three zones in the vertical profile -epilimnetic, upper hypolimnetic and anaerobic. Principal component analysis reduced the chemical parameters to the main contributors of conductivity (the main anions and cations) plus toxic sulphide and hydrogen sulphide. The animals were classified by the first two components into two groups: cold stenotherms and medium-sized filtrators, such as Bosmina longirostris. A specific analysis of vertical profiles generated five variants of diel vertical migrations. When time -space distributions of the plankters were analysed the highest numbers of different species were usually in different times and depths. The epilimnion was inhabited by small fishes and was dominated by rotifers but was free from C. flavicans which inhabited the cold hypolimnion, together with the remaining invertebrate predators (copepods and Asplanchna).Chaoborus and the other invertebrate predators participated more evenly in the contributions of species to the total density. In the presence of invertebrate predators the structure of the rotifer population shifted from soft-bodied species to spined or fast-moving species. When the predation pressure was too strong, as in the hypolimnion, the soft-bodied species were, in practice, absent. When the pit was in an oligotrophic state the hypolimnion population was composed of up to 60 -90% rotifers. When the trophic state shifted to mesotrophy, the proportion of cladocerans increased.

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Section: Discussionmentioning

confidence: 97%

Zooplankton of a flooded opencast sulphur mine

Żurek

2005

Aquat Ecol

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“…In another study, eggs of A. tonsa stopped hatching at oxygen concentrations lower than 0.07 mL O 2 L −1 , but were not killed since they resumed hatching when transferred to normoxic seawater . Experimental results obtained by various authors (Lutz et al, 1992Roman et al, 1993;Marcus and Lutz, 1994;Marcus et al, 1997;Invidia et al, 2004) differ slightly regarding the concentration of oxygen that induces quiescence and the maximum survival times for eggs exposed to hypoxic concentrations. In general, maximum survival time of A. tonsa eggs under anoxic conditions ranged from 20 to >32 days, related to variations in the developmental stages of the eggs and differences in the genetic and/or environmental histories of the females producing the eggs Marcus et al, 1997;Invidia et al, 2004).…”

Section: Reproductionmentioning

confidence: 95%

Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish)

et al. 2010

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Abstract. Dissolved oxygen (DO) concentration in the water column is an environmental parameter that is crucial for the successful development of many pelagic organisms. Hypoxia tolerance and threshold values are species-and stagespecific and can vary enormously. While some fish species may suffer from oxygen values of less than 3 mL O 2 L −1 through impacted growth, development and behaviour, other organisms such as euphausiids may survive DO levels as low as 0.1 mL O 2 L −1 . A change in the average or the range of DO may have significant impacts on the survival of certain species and hence on the species composition in the ecosystem with consequent changes in trophic pathways and productivity.Evidence for the deleterious effects of oxygen depletion on pelagic species is scarce, particularly in terms of the effect of low oxygen on development, recruitment and patterns of migration and distribution. While planktonic organisms have to cope with variable DOs and exploit adaptive mechanisms, nektonic species may avoid areas of unfavourable DO and develop adapted migration strategies. Planktonic organisms may only be able to escape vertically, above or beneath the Oxygen Minimum Zone (OMZ). In shallow areas only the surface layer can serve as a refuge, but in deep waters many organisms have developed vertical migration strategies to use, pass through and cope with the OMZ.Correspondence to: W. Ekau (wekau@zmt-bremen.de) This paper elucidates the role of DO for different taxa in the pelagic realm and the consequences of low oxygen for foodweb structure and system productivity. We describe processes in two contrasting systems, the semi-enclosed Baltic Sea and the coastal upwelling system of the Benguela Current to demonstrate the consequences of increasing hypoxia on ecosystem functioning and services.

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“…Therefore, a success in their adaptation to this new environment was a low sensitivity to salinity changes and an ability to endure the cold season at 6.0-8.0°C (Svetlichny et al, 2016;Svetlichny, Hubareva, & Isinibilir, 2018). A. tonsa survive low temperatures as dormant delayed-hatching eggs (Khanaychenko, 1997;Marcus & Lutz, 1994), whilst O. davisae overcome winter as quasi-diapausing fertilized females (Svetlichny et al, 2016).…”

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confidence: 99%

Response to salinity and temperature changes in the alien Asian copepod Pseudodiaptomus marinus introduced in the Black Sea

et al. 2019

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The salinity tolerance and the effect of temperature were studied on the behavior and motor activity of the nonindigenous Indo‐Pacific calanoid copepod Pseudodiaptomus marinus, first found in Sevastopol Bay (Black Sea) in autumn 2016. According to the index of median lethal salinity (LS50), the salinity tolerance range of adult P. marinus collected at 18.0 psu in November 2016 and subsequently reared in the laboratory amounted to 5.0–44.0 psu, independently of the acclimation regime. Females of P. marinus collected in December 2016 at 12.0°C became torpid at 8.0°C, a value typical of winter–spring Black Sea coastal areas. An increase in temperature from 8.0°C to 27.0°C led to an increase in the beat frequency of mouth appendages, swimming speed, and time spent cruising. However, at the same high temperature, the mean cruising speed in the feeding‐current feeder P. marinus was 2‐fold lower than that of the native, similarly sized cruise feeder Pseudocalanus elongatus. On the contrary, mouthpart beat frequency while cruising was 2‐fold higher reaching 80 Hz, due to the creation of feeding currents in P. marinus. The results of our experiments confirm the euryhaline character of P. marinus, and point to an apparent ability to survive cold temperatures in a torpid state. This suggests the possibility of entering an overwintering stage to survive the adverse cold winter–spring environmental conditions of the Black Sea, similarly to the recent thermophilic Indo‐Pacific invader Oithona davisae which established a successful population in the same area.

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Effects of anoxia on the viability of subitaneous eggs of planktonic copepods

Cited by 46 publications

References 23 publications

Zooplankton of a flooded opencast sulphur mine

Zooplankton of a flooded opencast sulphur mine

Impacts of hypoxia on the structure and processes in pelagic communities (zooplankton, macro-invertebrates and fish)

Response to salinity and temperature changes in the alien Asian copepod Pseudodiaptomus marinus introduced in the Black Sea

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