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Feeding behavior of seed mussel mytilus galloprovincialis: Environmental parameters and seed origin

AuthorsBabarro, José M. F. ; Fernández-Reiriz, María José ; Labarta, Uxío
Issue Date2000
PublisherNational Shellfisheries Association
CitationJournal of Shellfish Research 19: 195-201 (2000)
AbstractMussel seed (Mytilus galloprovincialis) from two original habitats (rocky shore and collector ropes) was cultivated on a raft in the Ria de Arousa (northwest Spain), for a period of 226 days (November 1995 through June 1996), from seeding to thinning out, during which time the behavior of clearance rates (CR) and ingestion rates (IR) was studied. The study of these two physiological parameters of energy acquisition (CR and IR) demonstrates that the two types of seed showed significant differences in these parameters at the start of the experiment and after the first 8 days on the raft. After 15 days, large increases in these physiological rates were observed for both types of seed, with the increase for the rocky shore mussels doubling that of the collector rope specimens. These increases led to the disappearance of the significant differences in CR and IR between both seed origins, with this situation being maintained for the remainder of the experimental period. The variation in CR follows a seasonal pattern, with low values being recorded in winter and increasing in spring and summer. Minor seasonal variations of total seston concentration are counterbalanced by an inverse variation in organic content, and so organic IR followed a pattern similar to that of CR. This seasonal variation can be attributed to fluctuations in the factors food quality (Q1) and temperature, in this order, as the use of multiple regression analysis has proved. Seed origin had a significant effect as a factor of interaction with food quality Q1, probably because of differences between the original habitats of the seed (rocky shore and collector ropes) in the latter factor. Although in this study food quality has been expressed in terms of organic content (Q1 = organic/total particulate matter), the content of phytoplankton as chlorophyll a may have had an important effect on the variation of both of these physiological rates. A significant exponential relationship has been established between the IR and the content in total particulate matter, which suggests regulation processes according to the amount of natural food available based on a decrease of CR.
Identifiersissn: 0730-8000
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