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A Causal Analysis of the Territorial and Courtship Behaviour of Chromis cyanea (Pomacentridae, Pisces)

Bart A. De Boer
Behaviour
Vol. 73, No. 1/2 (1980), pp. 1-50
Published by: Brill
Stable URL: http://www.jstor.org/stable/4534030
Page Count: 50
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A Causal Analysis of the Territorial and Courtship Behaviour of Chromis cyanea (Pomacentridae, Pisces)
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Abstract

The territorial and courtship behaviour of C. cyanea was studied on a reef off the South-coast of Curaçao, Netherlands Antilles. Protocols of the behaviour were made by means of an underwater taperecorder. The protocols were subjected to sequence analysis. The result of this analysis showed that the different motor-patterns could be ranked into groups characterized by the motor-patterns within a group showing more correlations among them then with motor-patterns outside this group. Further analysis showed that the associations of motor-patterns could be ascribed to them having internal factors in common. In this way different behavioral systems could be distinguished. The occurrence of different colour patterns shown by C. cyanea was also analyzed. It appeared that the presence of each colour pattern was correlated with a specific group of motor-patterns. These groups appeared to be the same as distinguished in the analysis of the motor-patterns. The correlation between the colour patterns and motor-patterns could be shown to be based on internal factors. The nature of the linkage between the behavioral systems and the mechanism controlling the colour patterns is discussed and it appears that the colour patterns can be used to gain further insight into the causation of the different motor-patterns. In the discussion I tried to show that the results of the analysis of the courtship behaviour are open to other explanations than the traditional one in which it is assumed that the causation of courtship behaviour is dependent on the interactions of three systems, i.e., sex, aggression and flight. A more parsimonious explanation of the data shows that there is no need to assume a separate sexual system for the causation of the courtship actions. These actions can be explained by interactions between an aggressive and a nesting system. The proportion in which each of these systems partakes in the causation of each separate action is regulated by a different system. /// Este estudio se trata de compartamiento territorial y comportamiento de cortejo de Chromis cyanea (Pomacentridae) en un arrecife de la costa sur de Curaçao, Antillas Holandesas. Se tomó protocolos de comportamiento con un grabador de cinta subaquatico, y se sometió los protocolos a un análisis de sucesión temporal. Los resultados de este análisis mostraron que se pudieron clasificar las acciones en grupos distintos caracterizados por las acciones dentro de grupo mostrando mas correlaciones entre si que con acciones fuera de este grupo. Se mostró que se podía attribuir las asociaciones de las acciones a aquellos teniendo factores internos en común. En este modo fué posible distinguir sistemas de comportamiento distintos. Tambien fueron analizados los patrones de colores mostrados por C. cyanea. Resultó que la presencia de cada patrón era correlado con un grupo de acciones specífico. Estos grupos resultaron ser los mismos que los grupos distinguidos en el análisis de las acciones. Se mostró que la correlación entre los patrones de colores y las acciones era determinada por factores internos. Se discutió el carácter de las relaciones entre los sistemas de comportamiento y el mecanismo controlando los patrones de colores y parece que se podría usar los patrones de colores para obtener ideas mas claras sobre la causación de las acciones. En la discusión traté de mostrar que los resultados de análisis de comportamiento de cortejo están abiertos para explicaciones distintos de la tradicional en cual se supone que la causación de comportamiento de cortejo depende de tres sistemas: el sistema sexual, el de agresión y el de evasión. Una explicación mas parsimonio de estos datos muestra que no es necesario suponer que exista un sistema sexual aparte para la causación de acciones de cortejo. Pueden explicar estas acciones por interacciones entre el sistema de agresión y el de anidar. La proporción en cual cada de estos sistemas participa en la causación de cada acción separada es regulado por un sistema diferente.

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