Local variation in embryo development rate in annual fish

Polačik, Matěj; Reichard, Martin; Vrtílek, Milan

doi:10.1111/jfb.13591

Cited by 8 publications

(17 citation statements)

References 53 publications

(104 reference statements)

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“…Interestingly, the range of N. furzeri lies on a gradient in aridity associated with distance from the coast. Evaporation, the amount of rainfall and its predictability are major environmental factors that vary across that gradient (Terzibasi et al, 2008; Tozzini et al, 2013; Polačik et al, 2018), with the driest and least predictable conditions furthest from the ocean (and at the highest altitude) (Figure 1A). N. furzeri is absent in the wettest region, where another two Nothobranchius species, that otherwise coexist with N. furzeri , maintain viable populations.…”

Section: Distributionmentioning

confidence: 99%

Nothobranchius furzeri, an 'instant' fish from an ephemeral habitat

Reichard

Polačik

2019

eLife

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The turquoise killifish, Nothobranchius furzeri, is a promising vertebrate model in ageing research and an emerging model organism in genomics, regenerative medicine, developmental biology and ecotoxicology. Its lifestyle is adapted to the ephemeral nature of shallow pools on the African savannah. Its rapid and short active life commences when rains fill the pool: fish hatch, grow rapidly and mature in as few as two weeks, and then reproduce daily until the pool dries out. Its embryos then become inactive, encased in the dry sediment and protected from the harsh environment until the rains return. This invertebrate-like life cycle (short active phase and long developmental arrest) combined with a vertebrate body plan provide the ideal attributes for a laboratory animal.

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Section: Distributionmentioning

confidence: 99%

Nothobranchius furzeri, an 'instant' fish from an ephemeral habitat

Reichard

Polačik

2019

eLife

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“…Nonetheless, the adaptive responses in the presence of predators are modulated by the coevolutionary history between predators and preys (Polačik & Janáč, 2017). In addition, the use of these strategies (including antipredator strategies) is directly related to the degree of environmental unpredictability that species face (Polačik & Janáč, 2017; Simons, 2011), resulting in different responses in different species (Polačik et al ., 2018). Yet, few studies have assessed the differences across species or populations that occur over a gradient of environmental predictability (Polačik & Janáč, 2017).…”

Section: Introductionmentioning

confidence: 99%

Recognizing the enemy: do predator cues influence hatching in Neotropical annual killifish?

Godoy

Weber

Lanés

et al. 2021

Journal of Fish Biology

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Annual fish species have evolved complex adaptations to survive in temporary wetlands. The main adaptation of these fish is the ability to produce embryos that survive dry periods. Embryo development of this fish can show variation at multiple levels influenced by many environmental factors, such as photoperiod and temperature. Predator cues are another factor that can influence the embryonic stage. One way in which annual fish could adapt to predators is by using risk‐spreading strategies (through bet‐hedging). Nonetheless, this strategy depends on the coevolutionary history between predators and preys and on the degree of environmental unpredictability, resulting in different responses across different species. This study investigated the influence of predator cues on the embryonic development and hatching of two Austrolebias species that inhabit ponds that present differences in hydroperiod and the risk of predator presence. The results confirmed a differentiated response between the two annual fish species tested, corroborating the modulation of hatching against the risk of predation by native predatory fish. The authors further showed that development times varied between the two annual fish species, regardless of the presence of predators. They highlight that the variation in embryonic development is strongly affected by different levels of hydroperiod unpredictability faced by the two species. To unravel finer‐scale local adaptations in the annual fish embryo development, future studies should focus on a region with greater spatial gradient.

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“…furzeri and No. kadleci;Polačik et al 2018). Together, these results suggest that other factors likely also contribute to driving differences in egg development patterns across species.…”

Section: Discussionmentioning

confidence: 81%

“…Philippi 1993;Evans et al 2006;Venable 2007). Moreover, evidence from several studies suggests that differences in bethedging responses occur among animal populations and species (Marshall et al 2008;Krug 2009;Nevoux et al 2010;García-Roger et al 2014;Polačik et al 2018). Yet, questions remain regarding the adaptive nature of these patterns, as few studies have assessed differences across species or populations that occur over a gradient of environmental predictability (but see García-Roger et al 2014;Polačik et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Variation in developmental rates is not linked to environmental unpredictability in annual killifishes

Rowiński

Sowersby

Näslund

et al. 2020

Preprint

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habitats 27 28 29 30 31 32 Author Contributions: PKR and BR conceived and designed the study, analyzed the data and wrote the manuscript.33 PKR with help from BR, WS, JN, and SE-L conducted the experiment. KG, WS, JN, and SE-L provided editorial advice 34 and comments on the study design.35 2 ABSTRACT 36 37Comparative evidence suggests that adaptive plasticity may evolve as a response to predictable 38 environmental variation. However, less attention has been placed on unpredictable environmental 39 variation, which is considered to affect evolutionary trajectories by increasing phenotypic variation 40 (or bet-hedging). Here, we examine the occurrence of bet-hedging in egg developmental rates in 41 seven species of annual killifish, which originate from a gradient of variation in precipitation rates, 42 under three treatment incubation temperatures (21°C, 23°C, and 25°C). In the wild, these species 43 survive regular and seasonal habitat desiccation, as dormant eggs buried in the soil. At the onset of 44 the rainy season, embryos must be sufficiently developed in order to hatch and complete their life-45 cycle. We found substantial differences among species in both the mean and variation of egg 46 development rates, as well as species-specific plastic responses to incubation temperature. Yet, there 47 was no clear relationship between variation in egg development time and variation in precipitation 48 rate (environmental predictability). The exact cause of these differences therefore remains 49 enigmatic, possibly depending on differences in other natural environmental conditions than 50 precipitation predictability. Hence, if species specific variances are adaptive, the relationship 51 between development and variation in precipitation is complex, and does not diverge in accordance 52 with simple linear relationships.

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Local variation in embryo development rate in annual fish

Cited by 8 publications

References 53 publications

Nothobranchius furzeri, an 'instant' fish from an ephemeral habitat

Nothobranchius furzeri, an 'instant' fish from an ephemeral habitat

Recognizing the enemy: do predator cues influence hatching in Neotropical annual killifish?

Variation in developmental rates is not linked to environmental unpredictability in annual killifishes

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