• Corpus ID: 46519857

Heteromorphic and isomorphic alternations of generations in macroalgae as adaptations to a seasonal environment

@article{Bessho2009HeteromorphicAI,
  title={Heteromorphic and isomorphic alternations of generations in macroalgae as adaptations to a seasonal environment},
  author={Kazuhiro Bessho and Yoh Iwasa},
  journal={Evolutionary Ecology Research},
  year={2009},
  volume={11},
  pages={691-711}
}
Background: Some macroalgae (seaweeds) have haploid and diploid life forms that differ greatly in size and morphology (heteromorphic life cycle). Others have very similar haploid and diploid life forms (isomorphic life cycle). Questions: What are the optimal reproductive cycles for a heteromorphic species and for an isomorphic species? Under what circumstances will a heteromorphic life cycle be more advantageous than an isomorphic life cycle. Mathematical model: We develop mathematical models… 

Figures from this paper

Influence of nutrients on ploidy-specific performance in an invasive, haplodiplontic red macroalga.
TLDR
How nutrient-dependent differences in growth and survival may contribute to observed patterns of tetrasporophytic dominance in soft-sediment A. vermiculophyllum populations is discussed.
A theoretical examination of environmental effects on the life cycle schedule and range limits of the invasive seaweed Undaria pinnatifida
TLDR
The aim of this study was to use a model (UndariaGEN) that incorporates a detailed representation of the individual heteromorphic life history stages (sporophytes and gametophytes) of the species in order to explore how interactions between these components contribute to the overall population dynamics.
Photosynthetic activity in two heteromorphic life‐history stages of a freshwater red alga, Thorea gaudichaudii (Thoreales) from Japan, in response to an irradiance and temperature gradient
TLDR
Large declines of Φ PSII and subsequent failure of F v/F m recovery were particularly enhanced at high irradiance, signifying photoinhibition, and the effective quantum yield in macroscopic and microscopic stages was negatively correlated with irradiance.
Temperature characteristics on the growth and photosynthesis of a red alga Phycocalidia tanegashimensis (= Pyropia tanegashimensis, Bangiales) reveal adaptation to subtropical environments due to year-round occurrence of the macroscopic gametophyte
The effects of temperature on the photosynthesis and growth of a subtropical red alga, Phycocalidia tanegashimensis (= Pyropia tanegashimensis, Bangiaceae, Bangiales) from Tanegashima Island, Japan,
A puzzle with many pieces: the genetic structure and diversity of Phaeocystis antarctica Karsten (Prymnesiophyta)
TLDR
The data suggest that even within blooms of P. antarctica genetic diversity and population sizes are large but exchange between different regions can be limited, and that even for planktonic species in a marine ecosystem that is influenced by strong currents, significant breaks in gene flow may occur.
The occurrence of Phycocalidia tanegashimensis (Bangiaceae) in the splash zone may be related to the tolerance of photochemical efficiency to temperature, irradiance, desiccation, and salinity
The combined effects of temperature and irradiance and the influences of desiccation and salinity on the photochemical efficiency in a subtropical red alga, Phycocalidia tanegashimensis (= Pyropia
An inducible predator defense in the marine microalga Emiliania huxleyi (Prymnesiophyceae) is linked to its heteromorphic haploid-diploid life cycle
TLDR
This paper presents a meta-analyses of cell cycle analysis and ploidy determination for inducible defense and the role of nutrients in the development of Haploid-diploidy and defense .
...
...

References

SHOWING 1-10 OF 28 REFERENCES
ON THE EVOLUTION OF COMPLEX LIFE CYCLES IN PLANTS: A REVIEW AND AN ECOLOGICAL PERSPECTIVE'
TLDR
Placement of complex life cycles of plants in an ecological framework will, it is hoped, encourage specific studies exploring possible adaptive aspects and limitations on the evolution of life cycles in plants with different life histories.
Ecology and the Evolution of Biphasic Life Cycles
TLDR
A genetic model for the evolution of life cycles that incorporates density‐dependent growth is developed and finds that ecological differences between haploid and diploid phases can lead to the evolution and maintenance of biphasic life cycles under a broad range of conditions.
FERTILIZATION SUCCESS CAN DRIVE PATTERNS OF PHASE DOMINANCE IN COMPLEX LIFE HISTORIES 1
TLDR
This work hypothesized that the gametophyte‐to‐sporophyte ratio of ecologically equivalent isomorphs could result from variation in fertilization rate and developed two models to test this hypothesis: one representing a generalized isomorphic life history and the other specific to red algae with a Polysiphonia‐type life history.
Complex life cycle and body sizes at life-history transitions for macroparasites
TLDR
The evolutionary dynamics of phenotypes that differ in their life cycles and in their body sizes are studied and size at birth, size at transition between hosts, at maturity, etc. depend on the productivity and mortality of parasites within different hosts.
Size-specific reproductive parameters in red algae: a comparative analysis for two sympatric species from Central Chile
  • P. Camus
  • Environmental Science, Biology
    Oecologia
  • 2004
TLDR
A size-independent threshold in reproductive effort was found for each species, and the variance of effort values decreased inversely with size, which suggests the existence of costs or trade-offs operating at the phenotypic level, but they would not be supported in a selective context.
The evolution of life cycles with haploid and diploid phases
TLDR
The current state of knowledge in this field of eukaryotes is reviewed, and the many questions that remain unanswered are touched upon.
Evolutionarily stable seasonal timing of univoltine and bivoltine insects
TLDR
If growth rate increases slower than proportionality, and if the resource availability peaks in the middle of the season, a symmetric bivoltinism can be optimal in which the larval periods of the two generations are equal.
Evolution of alternation of haploid and diploid phases in life cycles.
FUNCTIONAL SIMILARITY AMONG ISOMORPHIC LIFE‐HISTORY PHASES OF POLYCAVERNOSA DEBILIS (RHODOPHYTA, GRACILARIACEAE) 1
TLDR
Morphologically identical but different life‐history phases of the red alga Polycavernosa debilis (Forsskål) Fredericq and J. Norris showed no conspicuous differences in physiological or ecological performances, leading to two hypotheses: (1) that adaptive ecological‐physiological differences between life‐ history phases are subtle, or (2) that predominantly genetic / reproductive factors are implicated in maintaining isomorphic life‐ histories.
Sex and life-history stage alter herbivore responses to a chemically defended red alga.
TLDR
The variation in susceptibility to herbivory found between sex and life-history stages of A. parvula represents the first example of sex-biased consumption in seaweeds and may contribute to the maintenance of complex life histories such as those found in red algae.
...
...