Preferência por cores e importância de pistas visuais e químicas para a interação sociossexual no camarão Macrobrachium rosenbergii
The prawn Macrobrachium rosenbergii is a species of great economic importance. There are three male morphotypes in the species: small males can transform into orange claw males and these into blue claw males. There is little information about the sensory ecology of the species. Thus, this researc...
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| Formato: | doctoralThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/51965 |
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| Resumo: | The prawn Macrobrachium rosenbergii is a species of great economic importance. There are
three male morphotypes in the species: small males can transform into orange claw males and
these into blue claw males. There is little information about the sensory ecology of the species.
Thus, this research analyzed the preference of the prawns for different colors of shelters in
juveniles and adults, the importance of visual cues for mate choice in males and females, and
the relative importance of visual and chemical cues for mate location in females. To analyze
the preference for colors of shelters, we first modeled how the prawns would visualize different
colors that could be used in the production of the shelters, in order to use colors that would
allow us to assess whether the choice of the animals is based on chromaticity or brightness.
Subsequently, we inserted the prawns in an aquarium containing shelters with the colors that
we defined for the analysis of the attraction of the animals to them. Juveniles preferred the blue
shelter and based the decision on the chromaticity of the shelters while adults preferred the
darker gray shelters and showed an aversion to the lighter gray shelter, basing the decision on
brightness. To analyze the importance of visual cues for mate choice, we first photographed the
prawns and then created stimuli that corresponded to the prawns on a black background. We
modified in Photoshop the color of the claws of the males, the color of the ovary of femalels
visualized through the cephalothorax and the size of the prawns. We analyzed the preference
of males for females of different sizes and reproductive status and the preference of females for
males of different sizes and males with blue or orange claws introducing photographs on
opposite sides of the aquarium. We also verified if females would be equally attracted to the
photograph of the male and to the male himself present in an adjacent aquarium. Males did not
show greater preference for any photograph of the female. Females did not show greater
preference for males with blue or orange claws or for the real male or its photograph. However, they preferred the enlarged photograph to the diminished photograph of the male. To analyze
the relative importance of male visual and chemical cues for attraction of the females, we used
photograph of the male as a visual stimulus and water from the aquarium with the male as a
chemical stimulus. We analyzed the attraction of females to males when only chemical cues
were present, when chemical and visual cues were present on the same side of the aquarium,
and when chemical and visual cues were present on opposite sides of the aquarium. Females
were only attracted when there were chemical and visual cues present on the same side of the
aquarium. Thus, we conclude that visual cues are used by the prawns in different contexts, such
as when choosing shelters and, in the case of females, when choosing mates. Chemical cues
were also important, allowing, along with visual cues, males to be located by females. Our
results allow a better understanding of the sensorial ecology of the species and the improvement
of the cultivation of these animals. |
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