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Host–parasite ‘Red Queen’ dynamics archived in pond sediment
From the moment the parasite was first found in the sediments, the authors observed a steady increase in virulence over time, associated with higher fitness of the parasite, and a coevolutionary model based on negative frequency-dependent selection corroborated these experimental results.
LIFE HISTORY PLASTICITY IN A DAMSELFLY: EFFECTS OF COMBINED TIME AND BIOTIC CONSTRAINTS
The results suggest that both behaviorally mediated and direct responses to biotic factors and time constraints are a feature of the life history of this damselfly.
Reversible frequency–dependent switches in male mate choice
Evidence is shown for a reversible switch in mate choice in a frequency–dependent manner, choosing the most common morph, which probably allows males to minimize their search efforts and to maximize fitness.
Ponds and pools as model systems in conservation biology, ecology and evolutionary biology
It is argued that ponds and pools offer powerful potential for studies in ecology, evolutionary biology and conservation biology, and are good model systems for large-scale surveys and hypothesis testing through experimental manipulation.
Frequency-dependent male mate harassment and intra-specific variation in its avoidance by females of the damselfly Ischnura elegans
The results suggest that the maintenance of the color polymorphism is most probably the result of interactive selective forces depending on variation in all population conditions, instead of solely density- or frequency-dependent selection within populations.
Simultaneous Quaternary Radiations of Three Damselfly Clades across the Holarctic
- J. Turgeon, R. Stoks, R. Thum, Jonathan M. Brown, M. McPeek
- Biology, Environmental ScienceAmerican Naturalist
- 9 February 2005
Analysis of phylogenetic analyses of three radiating clades within the northern clade show similar, complex recent histories to produce 17 Nearctic and four Palearctic extant species, suggesting that recent climate fluctuations resulted in radiations driven by similar combinations of speciation processes acting in different lineages.
Population Dynamics Determine Genetic Adaptation to Temperature in Daphnia
- Wendy van Doorslaer, R. Stoks, Cathy Duvivier, A. Bednarska, L. De Meester
- Biology, Environmental ScienceEvolution; international journal of organic…
- 1 July 2009
The results of the competition experiment were in agreement with predictions based on performance as quantified in the life table experiment and illustrate that microevolution within a short time frame has the ability to influence the outcome of intraspecific competition.
FITNESS EFFECTS FROM EGG TO REPRODUCTION: BRIDGING THE LIFE HISTORY TRANSITION
The results indicate that larval constraints do not necessarily carry over to adult fitness through size and timing of transition, and that carryover effects may be sex specific, and may explain part of the unexplained variation in selection studies on adults.
Life history reaction norms to time constraints in a damselfly: differential effects on size and mass
This work imposed time constraints on full sibling larvae of the damselfly Enallagma cyathigerum by manipulating day length regimes and found that under a time constraint, larval development and growth rate based on size indeed were faster.
Predation risk induces stress proteins and reduces antioxidant defense
It is suggested that induction of stress proteins may contribute to the partly physiologically mediated growth reduction underpredation risk and that oxidative stress is a novel cost of predation risk that may have important long-term negative fitness consequences for the prey.