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Association between luminous bacteria and Hydrozoa in the northern Ionian Sea

Published online by Cambridge University Press:  13 September 2011

Cinzia Gravili*
Affiliation:
Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, I-73100 Lecce, Italia
Ferdinando Boero
Affiliation:
Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, I-73100 Lecce, Italia Istituto di Scienze Marine, Sezione di Genova, CNR, I-16127 Genova, Italia
Pietro Alifano
Affiliation:
Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, I-73100 Lecce, Italia
Loredana Stabili
Affiliation:
Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, I-73100 Lecce, Italia Istituto Ambiente Marino Costiero, Sezione di Taranto, CNR, I-74100 Taranto, Italia
*
Correspondence should be addressed to: C. Gravili, Dipartimento di Scienze e Tecnologie Biologiche ed Ambientali, Università del Salento, I-73100 Lecce, Italia email: cinzia.gravili@unisalento.it

Abstract

Several hydroid species live associated with many organisms, including bacteria. Hydroid–bacteria associations were searched for in twenty Hydrozoa species that were collected in the northern Ionian Sea and observed under blue light excitation. Of these, six showed high fluorescence on the outer perisarc, five appeared medium fluorescent, four were slightly fluorescent, and five did not show any fluorescence. Luminous bacteria were isolated and counted from the surface of the fluorescent hydroids. Their association with hydrozoan species could be explained by their feeding activity on the chitinous structures of the perisarc, as previous research on the hydroid Aglaophenia octodonta showed. Moreover, microalgae were always recovered together with luminous bacteria in the strongly, medium and slightly fluorescent hydroids. Further studies will be undertaken to characterize the luminous bacteria isolated from the surface of the examined hydrozoans as well as to better understand whether their interaction with hydroids is only related to chitin utilization or if their coexistence with microalgae in hydrozoans has an ecological meaning.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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