Distribution and abundance of Daphnia pulicaria, a large Daphnia of the “pulex group”, in Lake Constance (Lower Lake)

Stich, Hans Bernd; Maier, Gerhard

doi:10.1016/j.limno.2007.07.002

Cited by 5 publications

(15 citation statements)

References 18 publications

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“…Our analysis of the egg bank clearly revealed that a member of the Daphnia pulex species complex has invaded LLC around 1974 during the peak of eutrophication and subsequently established a population with a functional resting egg bank. Patterns of ephippia abundance and flux are highly consistent with reports on pelagial densities (Einsle , ; Stich & Maier ), suggesting that our reconstruction of the population history of Daphnia pulicaria in LLC is accurate. This combination of historical records and the dating of the egg bank allows us to determine the timing of the invasion with high certainty.…”

Section: Discussionsupporting

confidence: 84%

“…However, the fact that new alleles often occurred simultaneously and even within the same sample (e.g. new alleles at 4 different loci in sample MW_127a) and the virtual lack of new alleles in more recent periods despite comparable population sizes (Einsle ; Stich & Maier ) both argue against a strong contribution of mutation to the observed pattern. A single new allele in the most recent period may indicate that propagules are still transported to LLC, although we cannot exclude the possibility of a single mutation in this case.…”

Section: Discussionmentioning

confidence: 99%

“…). Daphnia pulicaria has been reported for the first time in 1974 (Einsle ) and its occurrence is restricted to LLC (Einsle ; Stich & Maier ). There, this large‐bodied species predominately occurs in deep water layers and its abundance is strongly fluctuating between years, most likely governed by fish predation pressure (Stich & Maier ).…”

Section: Methodsmentioning

confidence: 99%

“…). In the present work, we therefore combined available historical information (Einsle , ; Stich & Maier ) and genetic analyses of a sediment resting egg bank to reconstruct population history and genetic processes during invasion and establishment of a non‐native Daphnia species in Lower Lake Constance (LLC) from its first appearance during peak eutrophication 40 years ago up to recent years.…”

Section: Introductionmentioning

confidence: 99%

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Population genetic dynamics of an invasion reconstructed from the sediment egg bank

et al. 2015

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Biological invasions are a global issue with far-reaching consequences for single species, communities and whole ecosystems. Our understanding of modes and mechanisms of biological invasions requires knowledge of the genetic processes associated with successful invasions. In many instances, this information is particularly difficult to obtain as the initial phases of the invasion process often pass unnoticed and we rely on inferences from contemporary population genetic data. Here, we combined historic information with the genetic analysis of resting eggs to reconstruct the invasion of Daphnia pulicaria into Lower Lake Constance (LLC) in the 1970s from the resting egg bank in the sediments. We identified the invader as 'European D. pulicaria' originating from meso-and eutrophic lowland lakes and ponds in Central Europe. The founding population was characterized by extremely low genetic variation in the resting egg bank that increased considerably over time. Furthermore, strong evidence for selfing and/or biparental inbreeding was found during the initial phase of the invasion, followed by a drop of selfing rate to low levels in subsequent decades. Moreover, the increase in genetic variation was most pronounced during early stages of the invasion, suggesting additional introductions during this period. Our study highlights that genetic data covering the entire invasion process from its beginning can be crucial to accurately reconstruct the invasion history of a species. We show that propagule banks can preserve such information enabling the study of population genetic dynamics and sources of genetic variation in successful invasive populations.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Population genetic dynamics of an invasion reconstructed from the sediment egg bank

et al. 2015

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“… 1: Stich and Maier (); 2: Duffy and Hall (); 3: Dallas and Drake (); 4: Hall et al. (); 5: DeMott (); 6: Tessier and Woodruff (). …”

Section: Methodsmentioning

confidence: 99%

Competition‐mediated feedbacks in experimental multispecies epizootics

Dallas¹,

Hall²,

Drake³

2016

Ecology

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Competition structures ecological communities and alters host–pathogen interactions. In environmentally transmitted pathogens, an infection‐resistant competitor may influence infection dynamics in a susceptible species through the negative impacts of competition (e.g., by reducing host density or causing nutritional stress that increases susceptibility to infection) and/or the positive impacts of reducing transmission efficiency (e.g., by removing environmental pathogen stages). Thus, a non‐susceptible competitor may enhance, reduce, or have no net effect on susceptible host density and infection prevalence. Here, we couple an epidemiological model with experimental epidemics to test how resource competition with a non‐susceptible competitor (Daphnia pulicaria) influences fungal microparasite (Metschnikowia bicuspidata) infection dynamics in a susceptible host species (D. dentifera). Our model and experiments suggest that competitor density can mediate the direction and magnitude of the effect of competition on infection dynamics, with a peak in infection prevalence occurring at intermediate competitor densities. At low densities, the non‐susceptible competitor D. pulicaria may reduce infection prevalence in the susceptible host by removing fungal spores from the environment through feeding. However, when competitor density is increased and resources become limiting, D. pulicaria negatively impacts the susceptible host by increasing susceptible host feeding rates, and therefore fungal spore intake, and further by reducing susceptible host population size as it is driven toward competitive exclusion. In conclusion, these results show that a tradeoff between the competitor as a consumer of pathogen, which serves to reduce epidemic size, and as a modifier of susceptible host foraging ecology, which influences infection rates, may alternately enhance or dampen the magnitude of local epidemics.

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Food habits of bluegillLepomis macrochiruspopulations in reservoirs in Kagawa, Japan

Yokogawa

2018

Zoology and Ecology

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Distribution and abundance of Daphnia pulicaria, a large Daphnia of the “pulex group”, in Lake Constance (Lower Lake)

Abstract: The population dynamics and distribution of Daphnia pulicaria were studied in Lake Constance (Lower Lake). This Daphnia was absent in the year 2004, absent during most part of the year 2005 and absent in spring 2007 but present from

Cited by 5 publications

References 18 publications

Population genetic dynamics of an invasion reconstructed from the sediment egg bank

Population genetic dynamics of an invasion reconstructed from the sediment egg bank

Competition‐mediated feedbacks in experimental multispecies epizootics

Food habits of bluegillLepomis macrochiruspopulations in reservoirs in Kagawa, Japan

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