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An interaction-driven cannibalistic reaction norm.

Kinya Nishimura¹

¹Graduate School of Fisheries Sciences Hokkaido University Japan.

Ecology and Evolution

|February 23, 2018

Summary

Cannibalism in Hokkaido salamanders is induced by population density, leading to distinct morph types. This study reveals how social interactions and competition drive this remarkable phenotypic plasticity and morphological diversification.

Keywords:

Hynobius retardatus cannibalistic dimorphism density‐driven expression exploitative competition geometric morphometrics interaction‐driven expression interference competition reaction norm

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Area of Science:

Ecology
Evolutionary Biology
Developmental Biology

Background:

Cannibalism is a significant ecological factor influencing population dynamics.
Phenotypic plasticity allows organisms to adapt to environmental changes.
The Hokkaido salamander (Hynobius retardatus) exhibits density-dependent cannibalism.

Purpose of the Study:

To investigate phenotypic expression under a cannibalism reaction norm.
To understand how cannibalistic morph induction drives populational morphological diversification.
To explore the role of social interactions in phenotypic variation.

Main Methods:

Experimental manipulation of population density (low vs. high).
Geometric morphometrics to analyze shape characteristics.
Comparative analysis of morph types under different density conditions.

Main Results:

High-density populations developed dimorphism with distinct cannibal and non-cannibal morphs.
Significant shape differences were observed between morph types and between density treatments.
Cannibal and non-cannibal morphs exhibited unique size-shape integration rules, differing from solitary morphs.

Conclusions:

High-density-induced morphology follows a common integration rule during dimorphism development.
Phenotypic expression is influenced by population density and social interactions.
The induced cannibalistic morph reflects both exploitative and interference competition.