MECHANISMS OF SUSPENSION-FEEDING IN BIVALVES - RESOLUTION OF CURRENT CONTROVERSIES BY MEANS OF ENDOSCOPY

被引:124
作者
WARD, JE
MACDONALD, BA
THOMPSON, RJ
BENINGER, PG
机构
[1] MEM UNIV NEWFOUNDLAND,MARINE SCI RES LAB,ST JOHNS A1C 5S7,NEWFOUNDLAND,CANADA
[2] UNIV MONCTON,CTR RECH & ETUDES ENVIRONM,MONCTON E1A 3E9,NB,CANADA
[3] UNIV MONCTON,DEPT BIOL,MONCTON E1A 3E9,NB,CANADA
关键词
D O I
10.4319/lo.1993.38.2.0265
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Controversy concerning the mechanism of suspension feeding in bivalves centers around whether particle capture and transport on the gills (ctenidia) is accomplished via mucociliary or hydrodynamic action. Evidence for and against these fundamentally different processes has been based on examinations of isolated feeding structures and dissected specimens, techniques that may produce artifactual data owing to the trauma associated with the procedures. In the present study, in vivo observations of the ctenidia of undisturbed bivalves, made with a fiber-optic endoscope and video image-analysis system, revealed that the two mechanisms are not mutually exclusive. Both mucociliary and hydrodynamic mechanisms function concurrently at different sites on the ctenidia, thereby minimizing particle loss and optimizing particle transport efficiency. The importance of mucus in the normal feeding process of bivalves is confirmed. These findings refute results of previous studies that used surgically invasive techniques and emphasize the importance of making observations on morphologically intact specimens.
引用
收藏
页码:265 / 272
页数:8
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