Article (Scientific journals)
Phenology of farmed seaweed Kappaphycus alvarezii infestation by the parasitic epiphyte Polysiphonia sp. in Madagascar
Tsiresy, Gaëtan; Preux, Jérémy; Lavitra, Thierry et al.
2016In Journal of Applied Phycology, 28 (5), p. 2903–2914
Peer Reviewed verified by ORBi
 

Files


Full Text
Tsiresy et al. 2016_10.1007_s10811-016-0813-8-2.pdf
Publisher postprint (4.08 MB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
algoculture; marine disease; ultrastructure; Western Indian ocean; epiphytes
Abstract :
[en] epiphytic filamentous algae (EFA) disease has appeared in many regions of Madagascar. This infestation has dramatic consequences for local farmers as it alters drastically farmed algal growth and has caused farming activity to collapse in many places. The present study characterizes the structure and ultrastructure of the stages observed in the life cycle of Polysiphonia sp. and gives the results of a monitoring of 18 months made in three Kappaphycus alvarezii farming sites in the southwest of Madagascar. Transmission electron microscopy (TEM) was used to analyze the ultrastructure of the cortex in infested K. alvarezii. Five stages have been observed in the life cycle of Polysiphonia sp.: the infesting stage that is a small dark spot observed at the surface of K. alvarezii, the male gametophyte, the female gametophyte, the tetrasporocysts, and the undifferentiated stage where individuals show normal thalli without sexual differentiation. EFA infestation was never recorded in Sarodrano, but often in the two other monitored villages (Lambohara, Tampolove). Prevalence of infestation varied from 40 to 100 % and the rates of infestation from 42 to 78 epiphytes cm−2. Prevalence of infestation showed significant seasonal variation and a between-sites variation; the rates of infestation were not significantly different between sites and did not vary with the period. The ways of infestation between K. alvarezii individuals in an infested field and from infested to healthy fields are discussed at the light of the present results.
Research center :
UR Focus
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
Disciplines :
Aquatic sciences & oceanology
Agriculture & agronomy
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Tsiresy, Gaëtan;  Institut Halieutique et des Sciences mairnes (IHSM), Université de Tuléar, Madagascar > Polyaquaculture Research unit
Preux, Jérémy;  Université de Mons - UMONS > Marine Biology and Biomimetism
Lavitra, Thierry;  Institut d'Halieutique et des Sciences marines (IHSM), Université de Tuléar, Madagascar > Polyaquaculture Research unit
Dubois, Philippe;  Université Libre de Bruxelles - ULB > Marine Biology
Lepoint, Gilles  ;  Université de Liège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Eeckhaut, Igor;  Université de Mons - UMONS > Marine Biology and Biomimetism
Language :
English
Title :
Phenology of farmed seaweed Kappaphycus alvarezii infestation by the parasitic epiphyte Polysiphonia sp. in Madagascar
Publication date :
October 2016
Journal title :
Journal of Applied Phycology
ISSN :
0921-8971
eISSN :
1573-5176
Publisher :
Springer, Dordrecht, Netherlands
Volume :
28
Issue :
5
Pages :
2903–2914
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
DÉVELOPPEMENT DE POLYAQUACULTURES DANS LES VILLAGES CÔTIERS DU SUD-OUEST ET DU NORD DE MADAGASCAR
Funders :
CUD - Commission Universitaire pour le Développement [BE]
ARES CCD - Académie de Recherche et d'Enseignement Supérieur. Coopération au Développement [BE]
Available on ORBi :
since 29 February 2016

Statistics


Number of views
148 (9 by ULiège)
Number of downloads
1 (0 by ULiège)

Scopus citations®
 
28
Scopus citations®
without self-citations
27
OpenCitations
 
23

Bibliography


Similar publications



Contact ORBi