INVESTIGADORES
LEONARDI Patricia Ines
congresos y reuniones científicas
Título:
Diversity, phenomenology and epidemiology of epiphytism un farmed Gracilaria chilensis (Rhodophyta) in northern Chile
Autor/es:
LEONARDI PATRICIA; MIRAVALLES ALICIA; FAUGERON SYLVAIN; FLORES VERÓNICA; BELTRAN JESICA; CORREA JUAN
Lugar:
Bergen, Noruega
Reunión:
Congreso; XVIII International Seaweed Symposium; 2004
Institución organizadora:
Norwegian Institute for Water Research, Institute of Marine Research y Norwegian University of Science and technology
Resumen:
This study is focused on the identification of the most common epiphytes of Gracilaria chilensis and their infection mechanisms in a farm in northern Chile.  According to their invasiveness, the strength of attachment and the degree of damage caused in the host, we classified the infections into five categories. Infection types I and II included epiphytes weakly and strongly attached to the host surface respectively, but not associated with any host tissue damage.  In infection types III and IV, the epiphytes breach the cuticle of the host and penetrate the outer cell wall, without damaging its cortical tissue or causing disorganisation of the cortical tissue respectively.  Finally, infection type V includes epiphytes that penetrate inter-cellularly in the host, reach the medullar tissue and cause destruction of host cells in the area directly affected by the infecting structures. Prevalence and incidence of each infection type showed seasonal variability, with types II and III being the most abundant and present throughout the year.  Besides the diversity of the epiphytic flora and their infection mechanisms, specific responses of the host suggest that some degree of resistance does exist against some types of epiphytes.