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Anderson CE, Malek MC, Jonas-Closs RA, Cho Y, Peshkin L, Kirschner MW, Yampolsky LY. Inverse Lansing Effect: Maternal Age and Provisioning Affecting Daughters' Longevity and Male Offspring Production. Am Nat 2022; 200:704-721. [PMID: 36260845 DOI: 10.1086/721148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2024]
Abstract
AbstractMaternal age effects on offspring life history are known in a variety of organisms, with offspring of older mothers typically having lower life expectancy (the Lansing effect). However, there is no consensus on the generality and mechanisms of this pattern. We tested predictions of the Lansing effect in several Daphnia magna clones and observed clone-specific magnitude and direction of the maternal age effect on offspring longevity. We also report ambidirectional, genotype-specific effects of maternal age on the propensity of daughters to produce male offspring. Focusing on two clones with contrasting life histories, we demonstrate that maternal age effects can be explained by lipid provisioning of embryos by mothers of different ages. Individuals from a single-generation maternal age reversal treatment showed intermediate life span and intermediate lipid content at birth. In the clone characterized by the "inverse Lansing effect," neonates produced by older mothers showed higher mitochondrial membrane potential in neural tissues than their counterparts born to younger mothers. We conclude that an inverse Lansing effect is possible and hypothesize that it may be caused by age-specific maternal lipid provisioning creating a calorically restricted environment during embryonic development, which in turn reduces fecundity and increases life span in offspring.
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Chen Y, Romeis J, Meissle M. Performance of Daphnia magna on flour, leaves, and pollen from different maize lines: Implications for risk assessment of genetically engineered crops. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 212:111967. [PMID: 33524911 DOI: 10.1016/j.ecoenv.2021.111967] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 01/12/2021] [Accepted: 01/20/2021] [Indexed: 06/12/2023]
Abstract
Non-target effects of genetically engineered (GE) plants on aquatic Daphnia magna have been studied by feeding the species with different maize materials containing insecticidal Cry proteins from Bacillus thuringiensis (Bt). The results of those studies were often difficult to interpret, because only one GE plant was compared to one related non-GE control. In such a setting, effects of the Cry proteins cannot be distinguished from plant background effects, in particular when the test species is nutritionally stressed. In the present study, we tested the suitability of three different maize materials, i.e., flour, leaves and pollen, from five diverse non-GE maize lines (including EXP 258, a breeding line that is closely related to a SmartStax Bt maize) as exclusive food sources for D. magna. The parameters recorded included survival, sublethal endpoints such as body size, number of moltings to first offspring, time to first offspring, number of individuals in first clutch, total number of clutches, total number of offspring, average number of offspring per clutch, and population measures such as net reproductive rate R0, generation time T and intrinsic rate of increase rm. The results showed that D. magna can survive, grow and reproduce when fed only maize materials, although the performance was poorer than when fed algae, which indicates nutritional stress. Large differences in life table and population parameters of D. magna were observed among the different maize lines. Our results suggest that confounding effects caused by nutritional stress and plant background might explain some of the conflicting results previously published on the effects of Bt crops on D. magna. Using 95% confidence intervals for the means of the five maize lines for all measured parameters of D. magna performance in our study, we captured the natural range of variation. This information is useful for the interpretation of observed differences in D. magna performance between a GE plant and its non-GE comparator as it helps judging whether observed effects are of biological relevance. If differences between a GE and comparator line are observed and their biological relevance needs to be assessed in future risk assessments of GE maize, 1) the data on natural variation of the different parameters generated by previous studies can be informative (e.g. data from our study for maize fed D. magna); 2) for additional experiments the inclusion of multiple unrelated non-GE comparators should be considered; In addition, it should be taken into account that nutritional stress can affect the outcome of the study.
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Affiliation(s)
- Yi Chen
- Agroscope, Research Division Agroecology and Environment, Reckenholzstrasse 191, 8046 Zurich, Switzerland
| | - Jörg Romeis
- Agroscope, Research Division Agroecology and Environment, Reckenholzstrasse 191, 8046 Zurich, Switzerland
| | - Michael Meissle
- Agroscope, Research Division Agroecology and Environment, Reckenholzstrasse 191, 8046 Zurich, Switzerland.
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Chin TA, Cáceres CE, Cristescu ME. The evolution of reproductive isolation in Daphnia. BMC Evol Biol 2019; 19:216. [PMID: 31775606 PMCID: PMC6880586 DOI: 10.1186/s12862-019-1542-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 11/15/2019] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The process by which populations evolve to become new species involves the emergence of various reproductive isolating barriers (RIB). Despite major advancements in understanding this complex process, very little is known about the order in which RIBs evolve or their relative contribution to the total restriction of gene flow during various stages of speciation. This is mainly due to the difficulties of studying reproductive isolation during the early stages of species formation. This study examines ecological and non-ecological RIB within and between Daphnia pulex and Daphnia pulicaria, two recently diverged species that inhabit distinct habitats and exhibit an unusual level of intraspecific genetic subdivision. RESULTS We find that while ecological prezygotic barriers are close to completion, none of the non-ecological barriers can restrict gene flow between D. pulex and D. pulicaria completely when acting alone. Surprisingly, we also identified high levels of postzygotic reproductive isolation in 'conspecific' interpopulation crosses of D. pulex. CONCLUSIONS While the ecological prezygotic barriers are prevalent during the mature stages of speciation, non-ecological barriers likely dominated the early stages of speciation. This finding indicates the importance of studying the very early stages of speciation and suggests the contribution of postzygotic isolation in initiating the process of speciation.
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Affiliation(s)
- Tiffany A Chin
- Department of Biology, McGill University, 1205 ave Docteur Penfield, Montreal, Quebec, H3A 1B1, Canada.
| | - Carla E Cáceres
- School of Integrative Biology, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, USA
| | - Melania E Cristescu
- Department of Biology, McGill University, 1205 ave Docteur Penfield, Montreal, Quebec, H3A 1B1, Canada
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Camp AA, Haeba MH, LeBlanc GA. Complementary roles of photoperiod and temperature in environmental sex determination in Daphnia spp. J Exp Biol 2019; 222:jeb.195289. [DOI: 10.1242/jeb.195289] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 01/07/2019] [Indexed: 11/20/2022]
Abstract
Daphnia spp, a keystone genus in freshwater lentic habitats, are subject to environmental sex determination wherein environmental conditions dictate offspring sex and whether they reproduce asexually or sexually. The introduction of males into a population denotes the first step in the switch from asexual parthenogenetic reproduction to sexual reproduction. We tested the hypothesis that photoperiod and temperature co-regulate male sex determination and that these environmental stimuli would activate elements of the male sex determination signaling cascade. Results revealed that photoperiod was a critical cue in creating permissive conditions for male production. Further, under photoperiod-induced permissive conditions, male sex determination was temperature dependent. The two daphnid species evaluated, Daphnia pulex and D. magna, exhibited different temperature dependencies. D. pulex produced fewer males with increasing temperatures between 16-22°C, and D. magna exhibited the opposite trend. We found consistent expression patterns of key genes along the male sex determining signaling pathway in D. pulex independent of environmental stimuli. mRNA levels for the enzyme responsible for synthesis of the male sex determining hormone, methyl farnesoate, were elevated early in the reproductive cycle, followed by increased mRNA levels of the methyl farnesoate receptor subunits, Met and SRC. Environmental conditions that stimulated male offspring production significantly increased Met mRNA levels. Results indicate that male sex determination in daphnids is under the permissive control of photoperiod and the regulatory control of temperature. Further, these environmental cues may stimulate male sex determination by increasing levels of the Met subunit of the methyl farnesoate receptor.
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Affiliation(s)
- Allison A. Camp
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27695 USA
| | - Maher H. Haeba
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27695 USA
| | - Gerald A. LeBlanc
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27695 USA
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Yampolsky LY. GENETIC VARIATION IN THE SEXUAL REPRODUCTION RATE WITHIN A POPULATION OF A CYCLIC PARTHENOGEN, DAPHNIA MAGNA. Evolution 2017; 46:833-837. [DOI: 10.1111/j.1558-5646.1992.tb02089.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/1990] [Accepted: 09/23/1991] [Indexed: 11/30/2022]
Affiliation(s)
- L. Yu. Yampolsky
- N. I. Vavilov Institute of General Genetics; Academy of Science; Gubkin str., 3 GSP-1, V-333 Moscow RUSSIA
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Merritt CM, Torrentera L, Winter KM, Tornehl CK, Girvin K, Dodson SI. Dieldrin reduces male production and sex ratio in Daphnia galeata mendotae. Toxicol Ind Health 2016. [DOI: 10.1177/074823379901500117] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
We used the sex ratio of neonate Daphnia, as well as the more standard endpoints of adult survivorship and fecundity and neonatal morphology, as an assay for detecting the effects of the insecticides endosulfan and dieldrin. Dieldrin caused a decrease in sex ratio (number of males/number of males plus females); we observed no endosulfan effect. We estimated (by extrapolation) that the sex ratio was reduced by dieldrin from concentrations of about 30 ppb and higher, based on a linear decrease in sex ratio with log dieldrin concentrations from 50 to 600 ppb. Neither insecticide significantly affected adult survival or clutch size. Because sex ratio changed but total neonate production did not change, the data suggest that the effect of dieldrin was on the sex-determining system during embryogenesis. Neither insecticide caused morphological abnormalities. Mixtures of the two pesticides produced only additive effects.
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Affiliation(s)
| | - Laura Torrentera
- Department of Zoology, University of Wisconsin, Madison, Wisconsin
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Choi JY, Kim SK, La GH, Chang KH, Kim DK, Jeong KY, Park MS, Joo GJ, Kim HW, Jeong KS. Effects of algal food quality on sexual reproduction of Daphnia magna. Ecol Evol 2016; 6:2817-32. [PMID: 27217941 PMCID: PMC4863008 DOI: 10.1002/ece3.2058] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 02/04/2016] [Accepted: 02/08/2016] [Indexed: 11/11/2022] Open
Abstract
The objective of our study was to investigate sexual reproduction of Daphnia magna associated with mating behaviors and hatching rates, according to different algal food sources. Since a diatom is known to contain more abundant long‐chain poly unsaturated fatty acids (PUFAs), we hypothesized that the diatom‐consuming D. magna would exhibit more successful reproduction rates. Upon the hypothesis, we designed three experiments using two algal species, a green alga (Chlorella vulgaris) and a diatom (Stephanodiscus hantzschii). From the results, we found that the mating frequency and copulation duration increased in the treatment with S. hantzschii, resulting in a significant increase of hatching rates of resting eggs. In the other two repetitive mating strategies (e.g., one female vs. multiple males, and one male vs. multiple females), we found that the hatching rates of resting eggs were greater in the S. hantzschii treatment. In addition to the mating strategy, male body size significantly increased in the diatom treatment, hence average diameter of penis was also statistically different among the treatments (greater diameter in the S. hantzschii treatment). To examine the effect of algal food quality, we estimated quantity of fatty acids in the two algal species. Our result showed that S. hantzschii had a higher proportion of long‐chain PUFAs than C. vulgaris. Furthermore, a stable isotope analysis revealed that carbon and nitrogen originated from S. hantzschii were more assimilated to D. magna. In summary, our study manifested that diatom consumption of D. magna leads to more successful sexual reproduction. We then discussed how the diatom consumption of zooplankton influences food web dynamics in a freshwater ecosystem.
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Affiliation(s)
- Jong-Yun Choi
- National Institute of Ecology Seo-Cheon Gun Chungcheongnam Province 325-813 Korea
| | - Seong-Ki Kim
- Department of Biological Sciences Pusan National University Busan 609-735 Korea
| | - Geung-Hwan La
- Department of Environmental Education Sunchon National University Sunchon 540-742 Korea
| | - Kwang-Hyeon Chang
- Department of Environmental Engineering Kyung-Hee University Yongin 446-701 Korea
| | - Dong-Kyun Kim
- Department of Physical & Environmental Sciences University of Toronto Toronto ON M1C 1A4 Canada
| | - Keon-Young Jeong
- Institute of Environmental Science & Technology Pusan National University Busan 609-735 Korea
| | - Min S Park
- Advanced Biomass R&D Center Korea Advanced Institute of Science & Technology Daejeon 305-701 Korea
| | - Gea-Jae Joo
- Department of Biological Sciences Pusan National University Busan 609-735 Korea
| | - Hyun-Woo Kim
- Department of Environmental Education Sunchon National University Sunchon 540-742 Korea
| | - Kwang-Seuk Jeong
- Department of Biological Sciences Pusan National University Busan 609-735 Korea; Institute of Environmental Science & Technology Pusan National University Busan 609-735 Korea
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LeBlanc GA, Medlock EK. Males on demand: the environmental-neuro-endocrine control of male sex determination in daphnids. FEBS J 2015; 282:4080-93. [DOI: 10.1111/febs.13393] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 07/27/2015] [Accepted: 07/30/2015] [Indexed: 11/28/2022]
Affiliation(s)
- Gerald A. LeBlanc
- Department of Biological Sciences; North Carolina State University; Raleigh NC USA
| | - Elizabeth K. Medlock
- Department of Biological Sciences; North Carolina State University; Raleigh NC USA
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Walsh MR. The Link Between Environmental Variation and Evolutionary Shifts in Dormancy in Zooplankton. Integr Comp Biol 2013; 53:713-22. [DOI: 10.1093/icb/ict035] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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THIELSCH ANNE, BREDE NORA, PETRUSEK ADAM, DE MEESTER LUC, SCHWENK KLAUS. Contribution of cyclic parthenogenesis and colonization history to population structure inDaphnia. Mol Ecol 2009; 18:1616-28. [DOI: 10.1111/j.1365-294x.2009.04130.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Little TJ, Watt K, Ebert D. PARASITE-HOST SPECIFICITY: EXPERIMENTAL STUDIES ON THE BASIS OF PARASITE ADAPTATION. Evolution 2006. [DOI: 10.1111/j.0014-3820.2006.tb01079.x] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Little TJ, Watt K, Ebert D. PARASITE-HOST SPECIFICITY: EXPERIMENTAL STUDIES ON THE BASIS OF PARASITE ADAPTATION. Evolution 2006. [DOI: 10.1554/05-316.1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Salathé P, Ebert D. The effects of parasitism and inbreeding on the competitive ability in Daphnia magna: evidence for synergistic epistasis. J Evol Biol 2003; 16:976-85. [PMID: 14635913 DOI: 10.1046/j.1420-9101.2003.00582.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Synergistic epistasis for fitness is often assumed in models of how selection acts on the frequency and distribution of deleterious mutations. Evidence for synergistic epistasis would exist if the logarithm of fitness declines more quickly with number of deleterious mutations, than predicted by a linear decline. This can be studied indirectly by quantifying the effect of different levels of inbreeding on fitness. Here, six sets (different genetic backgrounds) of three increasingly inbred Daphnia magna clones were used to assess their relative fitness according to changes in frequency in a competition experiment against a tester clone. A novelty of the mating procedure was that the inbreeding coefficients (F) of the three clones belonging to each set increased in steps of 0.25 independent of the (unknown) inbreeding coefficient of the common ancestor. The equal increase of the inbreeding coefficients is important, because deviations influence the quantification of inbreeding depression, its variance and the detection of epistasis. In a simple mathematical model we show that when working with a partially inbred population inbreeding depression is underestimated, the variance of fitness is increased, and the detection of epistasis more difficult. Further, to examine whether an interaction between inbreeding and parasitism exists, each inbred clone was tested with and without a microsporidium infection (Octosporea bayeri). We found a nonlinear decrease of the logarithm of fitness across the three levels of inbreeding, indicating synergistic epistasis. The interaction term between parasitism and inbreeding was not significant. Our results suggest that deleterious mutations may be purged effectively once the level of inbreeding is high, but that parasitism seems not to influence this effect.
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Affiliation(s)
- P Salathé
- Zoologisches Institut, Universität Basel, Rheinsprung 9, CH-4051 Basel, Switzerland
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Olmstead AW, Leblanc GA. Juvenoid hormone methyl farnesoate is a sex determinant in the crustacean Daphnia magna. THE JOURNAL OF EXPERIMENTAL ZOOLOGY 2002; 293:736-9. [PMID: 12410602 DOI: 10.1002/jez.10162] [Citation(s) in RCA: 154] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Daphnids (Daphnia magna) utilize cyclic parthenogenesis as a reproductive strategy. During periods of abundant resources, these organisms reproduce asexually. In response to environmental cues that signal the onset of environmental adversity, daphnids produce males and reproduce sexually. The environmental cues that stimulate the sexual reproductive phase are well known; however, the endocrine signals that transduce these environmental cues remain unknown. The present study was undertaken to test the hypothesis that the crustacean juvenoid hormone, methyl farnesoate, is a male sex determinant in this species. Continuous exposure to aqueous concentrations of methyl farnesoate greater than approximately 30 nM stimulated a concentration-dependent production of male-containing broods of organisms. Short-term exposures to methyl farnesoate during periods of egg and embryo maturation revealed that male sex determination occurred during a specific 12-hour period of ovarian egg development. Exposure of eggs to 400 nM methyl farnesoate during this sensitive developmental period resulted in the production of all-male broods of offspring, while exposure to concentrations as low as 52 nM produced mixed broods of males and females. This active concentration range of methyl farnesoate is consistent with levels measured in the hemolymph of some decapod crustaceans. These results demonstrate that methyl farnesoate is capable of programming daphnid embryos to develop into males and is likely the endocrine factor responsible for initiating the sexual reproductive phase in these organisms.
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Affiliation(s)
- Allen W Olmstead
- Department of Environmental & Molecular Toxicology, North Carolina State University, Raleigh, North Carolina 27695-7633, USA
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Gomez A, Adcock GJ, Lunt DH, Carvalho GR. The interplay between colonization history and gene flow in passively dispersing zooplankton: microsatellite analysis of rotifer resting egg banks. J Evol Biol 2002. [DOI: 10.1046/j.1420-9101.2002.00368.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Olmstead AW, LeBlanc GA. Temporal and quantitative changes in sexual reproductive cycling of the cladoceran Daphnia magna by a juvenile hormone analog. THE JOURNAL OF EXPERIMENTAL ZOOLOGY 2001; 290:148-55. [PMID: 11471144 DOI: 10.1002/jez.1044] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Cyclic parthenogens, such as the cladoceran, Daphnia magna, utilize both asexual (parthenogenetic) and sexual reproduction in order to maximize population fitness in variable environments. Parthenogenetic reproduction is the default strategy among D. magna, while various environmental cues trigger cycles of sexual reproduction. Experiments were conducted with the juvenile hormone analog methoprene to test the hypothesis that members of the insect juvenile hormone/vertebrate retinoic acid family of transcription factors are involved in the regulation of sexual reproduction in daphnids. Neither methoprene, food reduction, or crowding independently stimulated entry into the sexual reproductive phase of the daphnids. However, the combination of food deprivation and crowding stimulated entry into the sexual reproductive phase characterized by an initial high production of males and the subsequent intermittent production of haploid egg-containing ephippia. Exposure to 160 nM methoprene along with food deprivation and crowding caused a significant reduction in the percentage of males produced during the early phase of the sexual cycle and significantly increased the percentage of males produced during the later stages of the cycle. Methoprene concentrations as low as 6.4 nM significantly reduced the number of resting eggs produced and proportionately increased the production of parthenogenetically-produced neonates. These experiments demonstrate that methoprene uncouples the coordinate production of males and resting eggs during the sexual reproductive period of D. magna. Methoprene stimulates male offspring production and defers their production to latter stages of the sexual reproductive period, while inhibiting the production of resting eggs and promoting the continuance of parthenogenetic reproduction. J. Exp. Zool. 290:148-155, 2001.
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Affiliation(s)
- A W Olmstead
- Department of Environmental and Molecular Toxicology, North Carolina State University, Raleigh, NC 27695-7633, USA
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Vanoverbeke J. An uncoupling of male and sexual egg production leads to reduced inbreeding in the cyclical parthenogen Daphnia. Proc Biol Sci 1999; 266:2471-7. [PMID: 10693817 PMCID: PMC1690476 DOI: 10.1098/rspb.1999.0948] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Cyclical parthenogenesis involves an alternation of parthenogenetic and sexual reproduction. In cyclical parthenogens with a short generation time, seasonal succession of clones switching to sexual reproduction at different periods of the growing season entails the risk of severe inbreeding with associated fitness costs. We show, however, that differences in genotype frequencies between males and sexual females result in a substantial reduction in the probability of selfing in natural Daphnia populations. This suggests that responses to male- and sexual egg-inducing stimuli may be uncoupled at the level of individual clones as a mechanism to avoid severe inbreeding.
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Deng HW. Environmental and genetic control of sexual reproduction in Daphnia. Heredity (Edinb) 1996. [DOI: 10.1038/hdy.1996.67] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Sexual reproduction in Daphnia: interspecific differences in a hybrid species complex. Oecologia 1995; 104:501-507. [DOI: 10.1007/bf00341348] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/1995] [Accepted: 06/19/1995] [Indexed: 11/26/2022]
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Maier G. The Life Histories of Two Temporarily Coexisting, Pond Dwelling Cladocerans. ACTA ACUST UNITED AC 1993. [DOI: 10.1002/iroh.19930780109] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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KORPELAINEN HELENA. Lowered female reproductive effort as an indicator for increased male production and sexuality inDaphnia(Crustacea: Cladocera). INVERTEBR REPROD DEV 1992. [DOI: 10.1080/07924259.1992.9672281] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Korpelainen H. Sex ratios and conditions required for environmental sex determination in animals. Biol Rev Camb Philos Soc 1990; 65:147-84. [PMID: 2190635 DOI: 10.1111/j.1469-185x.1990.tb01187.x] [Citation(s) in RCA: 121] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- H Korpelainen
- Department of Genetics, University of Helsinki, Arkadiankatu, Finland
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Souty-Grosset C, Chentoufi A, Mocquard JP, Juchault P. Seasonal Reproduction in the Terrestrial IsopodArmadillidium vulgare(Latreille): Geographical Variability and Genetic Control of the Response to Photoperiod and Temperature. ACTA ACUST UNITED AC 1988. [DOI: 10.1080/01688170.1988.10510373] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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