An ecological driver for the macroevolution of morphological polymorphism within colonial invertebrates

Area of Science:

• Marine Biology
• Evolutionary Biology
• Developmental Biology

Background:

• Colonial marine invertebrates exhibit modular growth, with asexual modules homologous to solitary bodies.
• Colonial growth allows for unique forms and strategies not possible in solitary animals.
• Colonies often display morphological polymorphism, with specialized module body types.

Purpose of the Study:

• To propose a mechanism linking the evolution of novel body types to life-history strategies in colonial invertebrates.
• To explain how morphological variation drives evolutionary innovation in colony-level strategies.

Main Methods:

• Conceptual framework development.
• Analysis of life-history theory in the context of colonial modularity.
• Exploration of evolutionary pathways from solitary to colonial forms.

Main Results:

• Colonial life-history strategies initially mirror those of individual modules.
• Evolution of new polymorph types introduces variation and plasticity in life-history strategies.
• Regulation of body type frequencies allows colonies to adapt and evolve complex life histories.

Conclusions:

• Novel body types are key to the evolution of complex life histories in colonial invertebrates.
• Morphological polymorphism enables adaptive flexibility and diversification of strategies.
• The evolution of new polymorphs expands the potential for variation in colonial life histories.