Brood space limitation of reproduction may explain growth after maturity in differently sized Daphnia species

Bartosiewicz, Maciej; Jabłoński, Jędrzej; Kozłowski, Jan; Maszczyk, Piotr

doi:10.1093/plankt/fbu108

Cited by 13 publications

(16 citation statements)

References 48 publications

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“…The synchronised animals that we photographed on day 4 were placed in corresponding media (50 animals per treatment in 2.5 L beakers to maintain the same density). Next, the longer and shorter diameters of two eggs, as well as the brood chamber were measured for corresponding animals to calculate their volume with the formula (according to Bartosiewicz et al, 2015): These individuals were photographed to be later measured for size at first reproduction (SFR), egg volume, and, additionally, in the experiments on D. galeata, clutch size and volume of the brood chamber.…”

Section: Experimental Designmentioning

confidence: 99%

“…Using ImageView software for image analysis, sexually mature individuals from each treatment were measured from the top of the eye to the base of the tail spine (SFR measurement). Next, the longer and shorter diameters of two eggs, as well as the brood chamber were measured for corresponding animals to calculate their volume with the formula (according to Bartosiewicz et al, 2015):…”

Section: Experimental Designmentioning

confidence: 99%

“…Similarly, two potential mechanisms are responsible for the production of smaller eggs in a state of hypoxia. More specifically, this results in the brood chamber constraints of smaller gravid females (Bartosiewicz, Jabłoński, Kozłowski, & Maszczyk, 2015), which may lead to the production of smaller eggs that can fit into a smaller brood chamber. More specifically, this results in the brood chamber constraints of smaller gravid females (Bartosiewicz, Jabłoński, Kozłowski, & Maszczyk, 2015), which may lead to the production of smaller eggs that can fit into a smaller brood chamber.…”

Section: Introductionmentioning

confidence: 99%

“…The first mechanism is that the effect is not directly due to hypoxia but rather due to smaller body size caused by hypoxia, resulting in body size constraints (Hanazato & Dodson, 1995). More specifically, this results in the brood chamber constraints of smaller gravid females (Bartosiewicz, Jabłoński, Kozłowski, & Maszczyk, 2015), which may lead to the production of smaller eggs that can fit into a smaller brood chamber. The second mechanism is the presence of maternal effects, with adult individuals exposed to hypoxia producing smaller eggs and, in turn, smaller offspring, with greater 5.…”

Section: Introductionmentioning

confidence: 99%

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The combined effects of hypoxia and fish kairomones on several physiological and life history traits of Daphnia

et al. 2019

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1. Numerous studies have tested the combined effect of the threat of predation by fish and low oxygen concentrations on the phenotypic plasticity of Daphnia.These studies assessed the trade-off between minimising predation risk and the negative effects of oxygen deficiencies in the context of depth selection behaviour. We tested whether this trade-off also affects physiological and life history traits. We expected an interactive effect between the threat of fish predation and low oxygen concentrations, such, that the net effect of both stressors would be antagonistic (lower than the sum of each of the stressors acting separately), rather than additive (or synergistic) on the majority of traits investigated, but we predicted synergistic effects on heat shock proteins (HSPs). 2. To test this, we performed life table experiments in different oxygen concentrations (normoxia and hypoxia) and levels of predation threat (the presence and absence of fish kairomones) on HSP70 and putative HSP110, haemoglobin concentration and life history traits with small-bodied Daphnia galeata and large-bodied Daphnia pulex originating from waterbodies where there were different risks of fish predation. 3. As predicted, the net effect of both stressors was antagonistic for most of the physiological and ecological variables studied. The presence of kairomones resulted in decreased body size of adults, egg size, egg size in relation to brood chamber volume, and in increased clutch size in relation to body size. These effects were weaker in hypoxia than in normoxia, which may suggest an existence of adaptive responses caused by a lower perceived risk in hypoxia than in normoxia, as the foraging abilities of fish are limited by oxygen deficiencies. 4. The presence of kairomones hampered the production of haemoglobin in hypoxia for the clones of larger-bodied species, which suggests the existence of a trade-off between reduced visibility under positive-size selective predation risk and increased efficiency of oxygen transport to body tissues. The presence of kairomones and hypoxia resulted in an increased level of putative HSP110, and the effect of kairomones was stronger in hypoxia than in normoxia. More complex results were obtained for the effect of both stressors on the level of HSP70. | 2205 WILCZYNSKI et al.

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Section: Experimental Designmentioning

confidence: 99%

Section: Experimental Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The combined effects of hypoxia and fish kairomones on several physiological and life history traits of Daphnia

et al. 2019

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“…Also, the sexes seem to show different life history strategies to maximize fitness. Females grow large, as the size of the brood chamber determines space available for eggs to develop (Bartosiewicz, Jabłoński, Kozłowski, & Maszczyk, 2015), and they seek resource rich and warm, although risky, surface waters (Lampert, 1989), where they grow fast. Males grow smaller than females (MacArthur & Baillie, 1929a), as they do not rely on large body size or accumulated resources for reproductive success.…”

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confidence: 99%

When males outlive females: Sex‐specific effects of temperature on lifespan in a cyclic parthenogen

Pietrzak

Grzesiuk

Dorosz

et al. 2018

Ecology and Evolution

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Lifespans of males and females frequently differ as a consequence of different life history strategies adopted to maximize fitness. It is well visible in cyclic parthenogens, such as water fleas of the genus Daphnia, where males appear in the population usually only for periods when receptive females are available. Moreover, even within one sex, different life history strategies and mechanisms regulating lifespan may exist. Previous studies suggested that Daphnia males may regulate their lifespan by staying in colder waters than females. We hypothesize that such behavioral mechanism should be associated with stronger reaction to low temperature–that is greater lifespan extension in males than in females. In this study, we monitored survivorship of Daphnia magna females and males of three clonal lines cultured at 16 or 20°C. The results did not provide a species‐level corroboration of our hypothesis; instead, they revealed very strong intraspecific differences in the responses of male and female lifespan to temperature change. They further suggest the existence of parallel life history strategies, hypothesis whose tests would bring new insights into the ecology of males in cyclic parthenogens.

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Food quantity and quality shapes reproductive strategies of Daphnia

Bednarska

2022

Ecology and Evolution

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In freshwater environments, one of the challenges aquatic grazers face are periods of suboptimal food quantity and quality. In a life table experiment, the effects of food quantity (a gradient of algae concentration) and quality (a diet of cyanobacteria) on the life histories and resource allocation strategy in Daphnia magna were tested. Growth‐related traits were similarly affected under different food regimes while the reproductive strategies differed in animals exposed to low food quantity and quality. The per‐clutch investment (clutch volume) did not differ between Daphnia fed with cyanobacteria and underfed mothers, but resources were differently allocated; underfed mothers increased their per‐offspring investment by producing fewer, but larger eggs, whereas cyanobacteria‐fed mothers invested in a greater number of eggs of smaller size. I argue that both strategies of resource allocation (number vs. size of eggs) may be adaptive under the given food regime. The results of the study show that the cyanobacteria diet‐driven fitness losses are comparable to losses caused by food quantity, which is only slightly above the growth capability threshold for Daphnia .

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Brood space limitation of reproduction may explain growth after maturity in differently sized Daphnia species

Cited by 13 publications

References 48 publications

The combined effects of hypoxia and fish kairomones on several physiological and life history traits of Daphnia

The combined effects of hypoxia and fish kairomones on several physiological and life history traits of Daphnia

When males outlive females: Sex‐specific effects of temperature on lifespan in a cyclic parthenogen

Food quantity and quality shapes reproductive strategies of Daphnia

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