INALI   02622
INSTITUTO NACIONAL DE LIMNOLOGIA
Unidad Ejecutora - UE
artículos
Título:
Fish kairomones alter life cycle and growth of a calanoid copepod
Autor/es:
GUTIERREZ, M. F.; PAGGI, J. C.; GAGNETEN, A. M.
Revista:
JOURNAL OF PLANKTON RESEARCH
Editorial:
OXFORD UNIV PRESS
Referencias:
Lugar: Oxford; Año: 2010 vol. 32 p. 47 - 55
ISSN:
0142-7873
Resumen:
In this study, we evaluate the effects of chemical information present in exudates of
the zooplanktivorous fish Cnesterodon decemmaculatus (Poeciliidae) on the life cycle and
growth of the planktonic copepod Notodiaptomus conifer. Semi-static assays were carried
out using five concentrations of fish water (FW; 0.413.3 fish L21), and a control
(without fish). Copepods responded to FW by faster development and earlier maturation
at smaller body size which resulted in a decline in the number of eggs in the
first clutch. The proportional duration of each larval stage was not modified in the
presence of fish chemical information, indicating that N. conifer maintained an equiproportional
development according to the growth model proposed for copepods.
Some parameters of the copepod life history changed depending on FW concentration,
while other responses were induced merely by the presence of fish exudates,
regardless of concentration. This study shows that calanoid copepods display as clear
individual life history responses to kairomones as those that have been known for cladocerans,
since 1980s. The observed responses are consistent with physiological
mechanisms acting directly on development and constitute an example of the importance
of predatorprey interactions as a selective force in aquatic environments.Cnesterodon decemmaculatus (Poeciliidae) on the life cycle and
growth of the planktonic copepod Notodiaptomus conifer. Semi-static assays were carried
out using five concentrations of fish water (FW; 0.413.3 fish L21), and a control
(without fish). Copepods responded to FW by faster development and earlier maturation
at smaller body size which resulted in a decline in the number of eggs in the
first clutch. The proportional duration of each larval stage was not modified in the
presence of fish chemical information, indicating that N. conifer maintained an equiproportional
development according to the growth model proposed for copepods.
Some parameters of the copepod life history changed depending on FW concentration,
while other responses were induced merely by the presence of fish exudates,
regardless of concentration. This study shows that calanoid copepods display as clear
individual life history responses to kairomones as those that have been known for cladocerans,
since 1980s. The observed responses are consistent with physiological
mechanisms acting directly on development and constitute an example of the importance
of predatorprey interactions as a selective force in aquatic environments.Notodiaptomus conifer. Semi-static assays were carried
out using five concentrations of fish water (FW; 0.413.3 fish L21), and a control
(without fish). Copepods responded to FW by faster development and earlier maturation
at smaller body size which resulted in a decline in the number of eggs in the
first clutch. The proportional duration of each larval stage was not modified in the
presence of fish chemical information, indicating that N. conifer maintained an equiproportional
development according to the growth model proposed for copepods.
Some parameters of the copepod life history changed depending on FW concentration,
while other responses were induced merely by the presence of fish exudates,
regardless of concentration. This study shows that calanoid copepods display as clear
individual life history responses to kairomones as those that have been known for cladocerans,
since 1980s. The observed responses are consistent with physiological
mechanisms acting directly on development and constitute an example of the importance
of predatorprey interactions as a selective force in aquatic environments.21), and a control
(without fish). Copepods responded to FW by faster development and earlier maturation
at smaller body size which resulted in a decline in the number of eggs in the
first clutch. The proportional duration of each larval stage was not modified in the
presence of fish chemical information, indicating that N. conifer maintained an equiproportional
development according to the growth model proposed for copepods.
Some parameters of the copepod life history changed depending on FW concentration,
while other responses were induced merely by the presence of fish exudates,
regardless of concentration. This study shows that calanoid copepods display as clear
individual life history responses to kairomones as those that have been known for cladocerans,
since 1980s. The observed responses are consistent with physiological
mechanisms acting directly on development and constitute an example of the importance
of predatorprey interactions as a selective force in aquatic environments.N. conifer maintained an equiproportional
development according to the growth model proposed for copepods.
Some parameters of the copepod life history changed depending on FW concentration,
while other responses were induced merely by the presence of fish exudates,
regardless of concentration. This study shows that calanoid copepods display as clear
individual life history responses to kairomones as those that have been known for cladocerans,
since 1980s. The observed responses are consistent with physiological
mechanisms acting directly on development and constitute an example of the importance
of predatorprey interactions as a selective force in aquatic environments.