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Medientyp:
E-Artikel
Titel:
Fragmentation modes and the evolution of life cycles
Beteiligte:
Pichugin, Yuriy
[VerfasserIn];
Pena, Jorge
[VerfasserIn];
Rainey, Paul B.
[VerfasserIn];
Traulsen, Arne
[VerfasserIn]
Erschienen:
Public Library of Sciences, 2017-11-22
Sprache:
Englisch
DOI:
https://doi.org/10.1371/journal.pcbi.1005860
Entstehung:
Anmerkungen:
Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
Beschreibung:
Reproduction is a defining feature of living systems. To reproduce, aggregates of biological units (e.g., multicellular organisms or colonial bacteria) must fragment into smaller parts. Fragmentation modes in nature range from binary fission in bacteria to collective-level fragmentation and the production of unicellular propagules in multicellular organisms. Despite this apparent ubiquity, the adaptive significance of fragmentation modes has received little attention. Here, we develop a model in which groups arise from the division of single cells that do not separate but stay together until the moment of group fragmentation. We allow for all possible fragmentation patterns and calculate the population growth rate of each associated life cycle. Fragmentation modes that maximise growth rate comprise a restrictive set of patterns that include production of unicellular propagules and division into two similar size groups. Life cycles marked by single-cell bottlenecks maximise population growth rate under a wide range of conditions. This surprising result offers a new evolutionary explanation for the widespread occurrence of this mode of reproduction. All in all, our model provides a framework for exploring the adaptive significance of fragmentation modes and their associated life cycles.