An experimental test of the ability of Daphnia galeata resting egg production in Lake Biwa

Tsugeki, Narumi K.; Urabe, Jotaro

doi:10.4081/jlimnol.2014.569

Cited by 2 publications

(2 citation statements)

References 46 publications

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“…Caution is needed, however, when reconstructing past Daphnia populations using resting eggs. Firstly, abundance of resting eggs stored in lake sediments may not reflect population density of Daphnia species in the past because the production rate of resting eggs depends on not only environmental conditions [ 16 , 17 ] but also the population genetic structures [ 18 , 19 ]. Thus, for estimating population density in the past, it is essential to quantify remains of planktonic individuals.…”

Section: Introductionmentioning

confidence: 99%

Historical Changes in the Ecosystem Condition of a Small Mountain Lake over the Past 60 Years as Revealed by Plankton Remains and Daphnia Ephippial Carapaces Stored in Lake Sediments

et al. 2015

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To examine if changes in species composition of a plankton community in the past due to anthropogenic activities can be clarified in lakes without any monitoring data, we analyzed genetically ephippial carapaces of Daphnia with plankton remains stored in the bottom sediments of Lake Hataya Ohunma in Japan. In the lake, abundance of most plankton remains in the sediments was limited and TP flux was at low levels (2–4 mg/m2/y) before 1970. However TP flux increased two-fold during the period from 1980s to 1990s. In parallel with this increase, abundance of most plankton remains increased although abundance of benthic testate amoebae’s remains decreased, indicating that the lake trophic condition had changed from oligo- to mesotrophic for the past 60 years. According to cluster analysis, the stratigraphic sediments were divided into two periods with different features of the phytoplankton composition. Chronological comparison with events in the watershed suggested that eutrophication occurred because of an increase in visitors to the watershed and deposition of atmospheric dust. In this lake more than 50% of resting eggs produced by Daphnia over the past 60 years hatched. However, genetic analysis of the ephippial carapaces (remains) showed that the Daphnia population was originally composed of D. dentifera but that D. galeata, or its hybrid with D. dentifera, invaded and increased the population density when the lake was eutrophied. Subsequently, large D. pulex established populations in the 1980s when largemouth bass were anonymously introduced. These results indicated that the Lake Hataya Ohunma plankton community underwent significant changes despite the fact that there were no notable changes in land cover or land use in the watershed. Since increases in atmospheric deposition and release of fish have occurred in many Japanese lakes, the changes in the plankton community described here may be widespread in these lakes.

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Section: Introductionmentioning

confidence: 99%

Historical Changes in the Ecosystem Condition of a Small Mountain Lake over the Past 60 Years as Revealed by Plankton Remains and Daphnia Ephippial Carapaces Stored in Lake Sediments

et al. 2015

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“…Since both JPN1 and JPN2 genotypes are obligately asexual, they can produce dormant eggs without males. However, the rate of dormant egg production may differ between these genotypes as shown in previous studies of Daphnia species (Roulin et al., 2015; Tsugeki & Urabe, 2014). Indeed, our laboratory experiment showed that the rate of dormant egg production was higher in the JPN2 genotype than in the JPN1 genotype.…”

Section: Discussionmentioning

confidence: 83%

To lose is to win: Long‐term co‐occurrence of two asexual populations realized by a dormant strategy of the inferior competitor

Maruoka,

Yamaki,

Makino

et al. 2024

Functional Ecology

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Asexual organisms are ubiquitous. While being members of a single species with the same ecological requirements, multiple asexual genotypes within a species are often found in a single habitat. Niche partitioning in time and space among genotypes has been proposed to explain this phenomenon. However, it is not clear whether these different genotypes co‐occur in the long term. Therefore, we examined the population dynamics of two asexual Daphnia cf. pulex genotypes (JPN1 and JPN2) over 9 years in a small mountain lake. These two genotypes consistently occurred in the same seasons and layers, suggesting that niche partitioning cannot explain their long‐term co‐occurrence. The abundance of JPN1 was typically higher in most years. However, the abundance of dormant eggs in lake sediments was at the same level between the genotypes. Results of a laboratory experiment showed that JPN1 competitively excluded JPN2. However, many JPN2 individuals produced dormant eggs before JPN1 competitively excluded them from the experiment. Furthermore, the competitively inferior JPN2 produced dormant eggs abundantly in the medium containing a crowding cue from JPN1 while no such trend was observed for JPN1. These results showed that a competitively inferior asexual genotype could maintain a population with a competitively superior genotype for a long period of time because it had the ability to detect an increase in competitors and produce dormant eggs each year before being competitively eliminated. Based on these results, we suggest that the variation in genotype‐specific response in dormant egg production to environmental change plays a key role in the long‐term co‐occurrence of different asexual genotypes in single habitats. Read the free Plain Language Summary for this article on the Journal blog.

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An experimental test of the ability of Daphnia galeata resting egg production in Lake Biwa

Abstract: The Daphnia galeata population in Lake Biwa (Japan)

Cited by 2 publications

References 46 publications

Historical Changes in the Ecosystem Condition of a Small Mountain Lake over the Past 60 Years as Revealed by Plankton Remains and Daphnia Ephippial Carapaces Stored in Lake Sediments

Historical Changes in the Ecosystem Condition of a Small Mountain Lake over the Past 60 Years as Revealed by Plankton Remains and Daphnia Ephippial Carapaces Stored in Lake Sediments

To lose is to win: Long‐term co‐occurrence of two asexual populations realized by a dormant strategy of the inferior competitor

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