Plant Science; Aquatic Science; Kappaphycus; Stable isotopes; Madagascar; Rhodophyta; Western Indian Ocean; Seaweed farming; Nutrient incorporation
Abstract :
[en] Seaweed farming for the production of carrageenan is a growing economic activity. Like everywhere in the marine environment, farmed algae such as Kappaphycus alvarezii can host algal organisms as epiphytes. Epiphytes ensure important functions in natural ecosystems, but these organisms can have negative impacts on their hosts and, in aquaculture be considered a plague responsible for significant economic losses. The mechanisms by which epiphytes act functionally on their hosts are multiple: shading effects, competition for nutrients or parasitism. Parasitism is characterised by the epiphyte diverting a proportion of the host’s resources. The objective of our work was to assess the impact of the epiphyte Polysiphonia sp. on the N and C acquisition of its farmed host K. alvarezii using two isotopic experiments with 13C and 15N as tracers. Our results demonstrated a double cumulative action: epiphytes could be capable of quickly outcompeting their hosts in terms of nutrient acquisition because of their better efficiency in C and N uptake, while also functionally qualifying as true parasites, as they divert some of the N resources acquired by their host. In terms of biocontrol, we suggest that the choice of nutrient-rich areas to practice Kappaphycus farming is likely to favour the epiphytes rather than their hosts, considering their relative needs and abilities to incorporate nutrients.
Research center :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Lepoint, Gilles ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution ; Université de Liège - ULiège > Freshwater and OCeanic science Unit of reSearch (FOCUS) ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Laboratoire d'Ecologie trophique et isotopique
Tsiresy, Gaëtan
Deydier, Mélanie
Pascal, Frédéric
Frederich, Bruno ; Université de Liège - ULiège > Freshwater and OCeanic science Unit of reSearch (FOCUS) ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Ecologie évolutive ; Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution
Eeckhaut, Igor
Language :
English
Title :
Functional effects of Polysiphonia sp. epiphytism on the farmed Kappaphycus alvarezii (Doty) Liao: Competition for the resource, parasitism or both?
Publication date :
19 June 2023
Journal title :
Journal of Applied Phycology
ISSN :
0921-8971
eISSN :
1573-5176
Publisher :
Springer Science and Business Media LLC
Peer reviewed :
Peer Reviewed verified by ORBi
Development Goals :
11. Sustainable cities and communities 1. No poverty
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