Morphological and life-history shifts of the exotic cladoceran Daphnia exilis in response to predation risk and food availability

Carter, Mauricio J.; Silva-Flores, Patricia; Oyanedel, Juan Pablo; Ramos‐Jiliberto, Rodrigo

doi:10.1016/j.limno.2012.09.004

Cited by 14 publications

(12 citation statements)

References 37 publications

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“…Changes in growth of daphnids are caused by different factors, such as food availability, predation and toxicants [33][34][35][36]. Taurine was found to be a stimulator of growth in marine moluscs [37]. The present study showed that ECT stimulates growth of Daphnia magna however the effect is dependent on the presence of food.…”

Section: Growth Ratesupporting

confidence: 43%

Subchronic Effects of Ectoine on Survival, Growth and Physiological Parameters of Daphnia Magna

Bownik¹,

Stępniewska²

2015

J Aquac Res Development

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Ectoine (ECT) is an osmoprotectant produced and accumulated by halophilic bateria under hyperosmotic stress. There is a lack of knowledge on the effect induced by this amino acid during subchronic animal exposure to ECT in vivo. Therefore, the aim the present study was to determine influence of ECT on survival, motility, physiological activity (heart rate, thoracic limb activity, and mandible movement rate), growth rate and moulting of unfed and fed with normal diet Daphnia magna exposed for 10 days to 2.5, 4, 20 and 25 mg/L ECT. The results showed that survival of unfed animals exposed to 25 mgL ECT was decreased; however it was increased at lower concentrations of the amino acid when compared to the control. 20 and 25 mg/L of ECT significantly decreased swimming velocity, heart rate and thoracic limb activity and mandible movement rate. On the other hand, the osmoprotectant did'nt cause mortality of fed daphnids at any concentration but stimulated swimming velocity and the physiological parameters, however no differences were found in mandible movement rate. We found that ECT increased growth rate both in starving and fed daphnids, however the stimulatory effect was not concentation-dependent. The most significant increase of growth rate both in unfed and fed dapnids was found at 4 mg/L ECT. Moulting frequency was increases only in unfed daphnids exposed to the highest concentrations of ECT. Fed daphnids showed slighlty elevated moulting frequency only at 25 mg/L ECT. Our results indicate ECT is a stimulator of growth rate and physiological indices in fed Daphnia magna, however the elucidation of its mechanisms requires further studies.

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Section: Growth Ratesupporting

confidence: 43%

Subchronic Effects of Ectoine on Survival, Growth and Physiological Parameters of Daphnia Magna

Bownik¹,

Stępniewska²

2015

J Aquac Res Development

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“…Therefore, depending on the trait, the degree of expression plasticity can be vary large within instar. The presence of fish chemicals decreases Daphnia body size (Brett 1992;Weber and Declerck 1997;Boersma et al 1998;Fisk et al 2007;Carter et al 2013). Daphnia expresses inducible defense throughout its entire lifespan in the presence of predators capable of ingesting prey of any size (Laforsch and Tollrian 2004;Rabus et al 2011).…”

Section: Instarsmentioning

confidence: 99%

Ecological and evolutionary factors of intraspecific variation in inducible defenses: insights gained from Daphnia experiments

Nagano

Doi

2020

Preprint

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Phenotypic variation among individuals and species is a fundamental principle of natural selection. In this review, we focus on numerous experiments involving the model species Daphnia (Crustacea) and categorize the factors, especially secondary ones, affecting intraspecific variations in inducible defense. Primary factors, such as predator type and density, determine the degree to which inducible defense expresses and increases or decreases. Secondary factors, on the other hand, act together with primary factors to inducible defense, or without primary factors on inducible defense. The secondary factors increase intra-species variation in inducible defense, and thus the level of adaptation of organisms varies within species. Future research will explore the potential for new secondary factors, as well as the relative importance between factors needs to be clarified.

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“…2013; Carter et al. 2013). The water flea Daphnia magna has a cyclical parthenogenetic life cycle, alternating a varying number of generations of asexual reproduction with regular (often yearly) bouts of sexual reproduction, the latter typically triggered by unfavorable environmental conditions (Miner et al.…”

Section: Introductionmentioning

confidence: 99%

“…Fish predation is a key structuring factor in zooplankton communities (Kerfoot and Sih 1987) and Daphnia populations (Cousyn et al 2001). Fish predation risk is also a stress factor (Pauwels et al 2005(Pauwels et al , 2010 and is a suitable stressor to quantify adaptive phenotypic plasticity as we have good predictions on what the adaptive phenotypic plasticity responses to visual predators are (e.g., smaller size at maturity and increased energy allocation to reproduction ;Dodson 1989;De Meester and Cousyn 1997;Spaak and Boersma 1997;Weber and Declerck 1997;Boersma et al 1998;Tollrian and Harvell 1999;Bourdeau et al 2013;Carter et al 2013). The water flea Daphnia magna has a cyclical parthenogenetic life cycle, alternating a varying number of generations of asexual reproduction with regular (often yearly) bouts of sexual reproduction, the latter typically triggered by unfavorable environmental conditions (Miner et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Several studies have quantified inbreeding depression in laboratory and wild populations of D. magna (e.g., De Meester 1993; Ebert et al 2002;Haag et al 2002), and inbreeding depression was in most cases found to be severe. However, no studies on inbreeding depression in Daphnia have yet looked at the consequences of inbreeding for adaptive phenotypic plasticity, despite the fact that Daphnia clones generally exhibit strong phenotypic plasticity with respect to antipredator defenses (e.g., Dodson 1989;De Meester and Cousyn 1997;Spaak and Boersma 1997;Weber and Declerck 1997;Boersma et al 1998;Bourdeau et al 2013;Carter et al 2013).…”

Section: Introductionmentioning

confidence: 99%

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Inbreeding and adaptive plasticity: an experimental analysis on predator‐induced responses in the water flea Daphnia

Swillen

Vanoverbeke

Meester

2015

Ecology and Evolution

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Several studies have emphasized that inbreeding depression (ID) is enhanced under stressful conditions. Additionally, one might imagine a loss of adaptively plastic responses which may further contribute to a reduction in fitness under environmental stress. Here, we quantified ID in inbred families of the cyclical parthenogen Daphnia magna in the absence and presence of fish predation risk. We test whether predator stress affects the degree of ID and if inbred families have a reduced capacity to respond to predator stress by adaptive phenotypic plasticity. We obtained two inbred families through clonal selfing within clones isolated from a fish pond. After mild purging under standardized conditions, we compared life history traits and adaptive plasticity between inbred and outbred lineages (directly hatched from the natural dormant egg bank of the same pond). Initial purging of lineages under standardized conditions differed among inbred families and exceeded that in outbreds. The least purged inbred family exhibited strong ID for most life history traits. Predator-induced stress hardly affected the severity of ID, but the degree to which the capacity for adaptive phenotypic plasticity was retained varied strongly among the inbred families. The least purged family overall lacked the capacity for adaptive phenotypic plasticity, whereas the family that suffered only mild purging exhibited a potential for adaptive plasticity that was comparable to the outbred population. We thus found that inbred offspring may retain the capacity to respond to the presence of fish by adaptive phenotypic plasticity, but this strongly depends on the parental clone engaging in selfing.

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Morphological and life-history shifts of the exotic cladoceran Daphnia exilis in response to predation risk and food availability

Cited by 14 publications

References 37 publications

Subchronic Effects of Ectoine on Survival, Growth and Physiological Parameters of Daphnia Magna

Subchronic Effects of Ectoine on Survival, Growth and Physiological Parameters of Daphnia Magna

Ecological and evolutionary factors of intraspecific variation in inducible defenses: insights gained from Daphnia experiments

Inbreeding and adaptive plasticity: an experimental analysis on predator‐induced responses in the water flea Daphnia

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