Current knowledge of South American cladoceran diapause: a brief review.
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2016
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The study of the structure and dynamics of cladoceran egg banks in SouthAmerica 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 fromthe 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 constitutesa challenge.Therefore,
collaborative research with the aim of generating pictorial taxonomical support for Neotropical
resting eggs are encouraged.Webelieve 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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IGLESIAS, C. et al. Current knowledge of South American cladoceran diapause: a brief review. International Review of Hydrobiology, v. 101, p. 1-14, 2016. Disponível em: <http://onlinelibrary.wiley.com/doi/10.1002/iroh.201501825/abstract>. Acesso em: 25 ago. 2017.