The effect of abiotic factors on the hatching of Moina micrura Kurz, 1874 (Crustacea: Cladocera) ephippial eggs

Rojas, Nilton Eduardo Torres; Marins, M. A.

doi:10.1590/s1519-69842001000300005

Cited by 23 publications

(17 citation statements)

References 7 publications

(9 reference statements)

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“…The results obtained suggest that higher temperatures have a negative effect on the hatching of D. laevis (Pampulha lake) and D. ambigua (Nado lake) resting eggs. Similar results were obtained in the tropical region for Moina micrura ephippia originated from fi sh culture tanks (Rojas et al 2001). Dupuis and Hann (2009) demonstrated, by modeling, that climate changes can have negative consequences for the zooplanktonic populations of a temperate region, since it can affect important environmental stimuli which would stimulate the hatching of resting eggs, leading to dormancy THÉCIA A.S.V.…”

Section: Discussionsupporting

confidence: 63%

High temperatures and absence of light affect the hatching of resting eggs of Daphnia in the tropics

Paes

Rietzler

Pujoni

et al. 2016

An. Acad. Bras. Ciênc.

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Temperature and light are acknowledged as important factors for hatching of resting eggs. The knowledge of how they affect hatching rates of this type of egg is important for the comprehension of the consequences of warming waters in recolonization of aquatic ecosystems dependent on dormant populations. This study aimed at comparing the infl uence of different temperature and light conditions on hatching rates of Daphnia ambigua and Daphnia laevis resting eggs from tropical environments. The ephippia were collected in the sediment of three aquatic ecosystems, in southeastern Brazil. For each lake, the resting eggs were exposed to temperatures of 20, 24, 28 and 32 °C, under light (12 h photoperiod) and dark conditions. The results showed that the absence of light and high temperatures have a negative infl uence on the hatching rates. Statistical differences for hatching rates were also found when comparing the studied ecosystems (ranging from 0.6 to 31%), indicating the importance of local environmental factors for diapause and maintenance of active populations.

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Section: Discussionsupporting

confidence: 63%

High temperatures and absence of light affect the hatching of resting eggs of Daphnia in the tropics

Paes

Rietzler

Pujoni

et al. 2016

An. Acad. Bras. Ciênc.

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“…A few of the hatching experiments were conducted to test specific extrinsic factors including: predation cues (Santangelo et al, 2010), pH, temperature, light regime Table 1 where the characteristics of each sampled ecosystem are provided. (Rojas et al, 2001;Paes et al, 2016), salinity (Santangelo et al, 2014), drying and temperature pre-treatment of the eggs before hatching tests (Santangelo et al, 2011a), duration of the dry period (Stenert et al, 2009), and the age of the resting stages ( Avila et al, 2015).…”

Section: Reporting Of Methodological Informationmentioning

confidence: 99%

Current knowledge of South American cladoceran diapause: A brief review

Iglesias

Bonecker

Brandão

et al. 2016

Internat. Rev. Hydrobiol.

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The study of the structure and dynamics of cladoceran egg banks in South America began only 15 years ago and the amount of knowledge, in addition to being scarce, is widely spread over partially national journals, theses, and books, and thus partially unavailable. We conducted a review of the literature published for this region, focusing mainly on the methodological approaches that have been applied and describe the main findings already published. The different methodological approaches make data comparability difficult. However, a total of 77 egg morphotypes were identified in the published studies. Among the variety of methods used, we suggest to adopt as the standard procedure: 1) pre isolation of eggs from the sediments by the “Sugar Flotation Method;” 2) identification, enumeration, and sorting of egg morphotypes present in the sample; 3) individual hatching of each egg morphotype; 4) adult individual identification to the species level according to available keys; and 5) linking identified eggs to identified species’ adults. The absence of identification keys constitutes a challenge. Therefore, collaborative research with the aim of generating pictorial taxonomical support for Neotropical resting eggs are encouraged. We believe the adoption of the suggested protocol might facilitate this issue. An extremely low hatching success was reported for most studies and the factors triggering the break of dormancy in the resting eggs coming from permanent systems remain unknown. In conclusion, resting egg studies are a novel and promising field in South America, but with many challenges that need to be addressed.

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“…Factors like photoperiod, temperature, food availability, population density, and kairomone are all known to be involved in ephippial production (Zadereev, 2003). There are also anthropogenic factors such as increased temperature due to global warming (Yurista, 1999), ozone layer depletion (Rhode et al, 2001;Rojas et al, 2001;De Lange & Van Reeuwijk, 2003), and acidification of freshwaters (Zimmer & Storr, 1984) that affect zooplankton behaviour (vertical migration), distribution, abundance, body size, and age at maturity of cladocerans in temperate regions (McKee et al, 2002). As observed for many other organisms cladoceran taxa not previously reported from the northern hemisphere are now increasingly being observed in routine zooplankton samples; one of the main causative factors may be global warming (Kolar et al, 1997).…”

Section: Role Of Light and Temperaturementioning

confidence: 99%

Life history strategies of cladocerans: comparisons of tropical and temperate taxa

2005

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We review recent works on different life history variables of cladoceran taxa in tropical and temperate freshwater bodies, comparing the strategies that cladocerans have evolved to adapt to contrasting environmental conditions in the two geographical regions. These life-history parameters relate to age and size at maturity, survival, fecundity, life-expectancy at birth, lifespan, gross, and net reproductive rates, generation time, the rate of population increase, peak population density and day of peak abundance. We also discuss the role of photoperiod and temperature on some of these life history parameters. We found a general paucity of experimental work and field data in tropics on cladocerans. There is very limited information on the few Daphnia species found in the tropics. The misconception of low species diversity of cladocerans in the tropics arose due to several reasons including lack of extensive and intensive field collections. Higher water temperatures apparently promote permanent infestation of tropical waters with toxic cyanobacteria, which reduce the zooplankton diversity. In addition to higher temperatures in the tropics, the year-round high predation pressure of planktivorous fish probably causes the tropical species, particularly in pelagic habitats, to reach maturity earlier (<3 days) than in temperate regions. Species of Daphnia in temperate regions are particularly adapted to living at food concentrations that are much lower and seasonably more variable than those for tropical genera such as Diaphanosoma. This is further corroborated by the more than an order of magnitude higher threshold food concentration (TFC) for tropical Cladocera than for their temperate counterparts. Fecundity patterns differ between tropical and temperate cladoceran taxa: cultured under optimal temperature regimes, tropical taxa have fewer eggs than temperate species of a comparable body size. Predation pressure may act differently depending on the size of the cladoceran neonates and thus on their population size structure. Global warming and climate changes seem to affect the behaviour (migration), distribution, and abundance of cladocerans. Apparently, in direct response to these changes, the possibility of encountering the tropical cladocerans in the northern, temperate hemisphere (bioinvasions) is on the rise.

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The effect of abiotic factors on the hatching of Moina micrura Kurz, 1874 (Crustacea: Cladocera) ephippial eggs

Cited by 23 publications

References 7 publications

High temperatures and absence of light affect the hatching of resting eggs of Daphnia in the tropics

High temperatures and absence of light affect the hatching of resting eggs of Daphnia in the tropics

Current knowledge of South American cladoceran diapause: A brief review

Life history strategies of cladocerans: comparisons of tropical and temperate taxa

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