scholarly journals Diel and Semi-Lunar Cycles in the Swimming Activity of the Intertidal, Benthic Amphipod Corophium Volutator in the Upper Bay of Fundy, Canada

2009 ◽  
Vol 29 (1) ◽  
pp. 51-56 ◽  
Author(s):  
David Drolet ◽  
Myriam A. Barbeau
Keyword(s):  
Swimming Activity ◽  
Bay Of Fundy ◽  
Corophium Volutator ◽  
Lunar Cycles

Spatial distribution of the intertidal snail Ilyanassa obsoleta in relation to parasitism by two species of trematodes

2000 ◽  
Vol 78 (7) ◽  
pp. 1137-1143 ◽  
Author(s):  
Dean G McCurdy ◽  
J Sherman Boates ◽  
Mark R Forbes
Keyword(s):  
Spatial Distribution ◽  
Intertidal Zone ◽  
Bay Of Fundy ◽  
Spatial Distributions ◽  
Ilyanassa Obsoleta ◽  
Intermediate Hosts ◽  
Corophium Volutator ◽  
Vertical Distributions ◽  
Second Intermediate Host ◽  
Intertidal Snail

We studied the spatial distributions of mud snails (Ilyanassa obsoleta) infected by two trematodes, Lepocreadium setiferoides and Gynaecotyla adunca, on a macrotidal mudflat in the Minas Basin, Bay of Fundy. Snails, as first intermediate hosts, were castrated by both parasites, and we found no evidence of sex differences in parasitism. Similar to previous work, prevalence of L. setiferoides in I. obsoleta increased exponentially with host size (and age). Unexpectedly, prevalence of G. adunca decreased over the largest size classes of snails, a result that may be due to several causes. Distributions of both parasites across the intertidal zone differed from previous accounts in that snails infected with L. setiferoides were found only in the middle of the intertidal zone, whereas prevalence of G. adunca increased exponentially moving seaward. Several species of polychaetes could be infected by L. setiferoides in the laboratory and may act as appropriate second intermediate hosts, whereas only the amphipod Corophium volutator served as a second intermediate host for G. adunca. Finally, the vertical distributions of I. obsoleta infected by either species of trematode overlap with distributions of apparent or known second intermediate hosts.

scholarly journals Behavioral Response of Corophium volutator to Shorebird Predation in the Upper Bay of Fundy, Canada

PLoS ONE ◽  
2014 ◽  
Vol 9 (10) ◽  
pp. e110633 ◽  
Author(s):  
Elizabeth C. MacDonald ◽  
Elisabeth H. Frost ◽  
Stephanie M. MacNeil ◽  
Diana J. Hamilton ◽  
Myriam A. Barbeau
Keyword(s):  
Behavioral Response ◽  
Bay Of Fundy ◽  
Corophium Volutator

The effects of low temperature pulses in rephasing the endogenous activity rhythm of Corophium volutator (Pallas)

1983 ◽  
Vol 63 (4) ◽  
pp. 851-860 ◽  
Author(s):  
Walter F. Holmström ◽  
Elfed Morgan
Keyword(s):  
Low Temperature ◽  
Activity Rhythm ◽  
Swimming Activity ◽  
Phase Delay ◽  
Endogenous Rhythm ◽  
Cold Period ◽  
Sample Population ◽  
Zero Temperature ◽  
Corophium Volutator ◽  
Endogenous Activity

The endogenous rhythm of swimming activity shown by Corophium is reset by pulses of sub-zero temperature, the activity maxima being rephased to the time of rewarming at the end of the cold period. Chilling is not equally effective at all stages of the tide, pulses applied during the flood tide causing a phase delay, while those applied during the ebb advance the rhythm. Chilling at the time of low water induces arrhythmic swimming and it is suggested that the rhythm enters a state of equivocation at this time when an advance and a delay in phase are both equally probable. This results in the loss of synchronization between individuals and the disappearance of the overt rhythm from the sample population.

scholarly journals Spatial and Temporal Variation in the Population Dynamics of the Intertidal Amphipod Corophium Volutator in the Upper Bay of Fundy, Canada

2009 ◽  
Vol 29 (4) ◽  
pp. 491-506 ◽  
Author(s):  
Myriam A. Barbeau ◽  
Deirdre C. Sheahan ◽  
Erin E. Arnold ◽  
Diana J. Hamilton ◽  
Lorelei A. Grecian
Keyword(s):  
Population Dynamics ◽  
Temporal Variation ◽  
Spatial And Temporal Variation ◽  
Bay Of Fundy ◽  
Corophium Volutator

scholarly journals The Location of Circa-Tidal Pacemakers in the Estuarine Amphipod Corophium Volutator Using a Selective Chilling Technique

1984 ◽  
Vol 110 (1) ◽  
pp. 125-142
Author(s):  
GERARD J. HARRIS ◽  
ELFED MORGAN
Keyword(s):  
Swimming Activity ◽  
Autonomous Control ◽  
Endogenous Rhythm ◽  
Anatomical Location ◽  
Corophium Volutator ◽  
Body Regions ◽  
Control Centre ◽  
Tidal Rhythm

1. The anatomical location of the control centre(s) for the endogenous tidal rhythm of swimming activity shown by Corophium volutator (Pallas) has been investigated using a selective chilling technique. 2. Rephasing occurred on chilling the whole animal to −3 °C or on chilling either the supra- or sub-oesophageal ganglion alone, whereas cold pulses applied to the telson or mid-body regions were without effect. 3. Ablating the eyes had no effect on the endogenous rhythm. 4. The results are interpreted in terms of two autonomous control centres.

Sex ratios of Corophium volutator (Pallas) (Crustacea: Amphipoda) in Bay of Fundy populations

1994 ◽  
Vol 72 (11) ◽  
pp. 1915-1921 ◽  
Author(s):  
Saul D. Schneider ◽  
J. Sherman Boates ◽  
Mark Forbes
Keyword(s):  
Prey Species ◽  
Sex Ratios ◽  
Accurate Method ◽  
Bay Of Fundy ◽  
Adult Males ◽  
Corophium Volutator ◽  
Important Prey ◽  
Differential Predation ◽  
History Of ◽  
Biased Sex Ratio

Previous work on the tube-dwelling intertidal amphipod Corophium volutator (Pallas) has shown that adult sex ratios are female-biased for populations along the Bay of Fundy, Canada. The causes of these biased sex ratios, and many other aspects of the life history of this important prey species, are unknown. Some authors have suggested that biased sex ratios for adults may be due to differential predation on adult males by migrant shorebirds. Such differential predation is not expected for juvenile C. volutator, which differ in behaviour from adult males. In this study, we first demonstrate an accurate method of sexing juvenile C. volutator that is based on sex differences shown by adults. This method will enable more detailed ecological studies of C. volutator. We then show that sex ratios are female-biased for juvenile C. volutator, which is probably a more important determinant of a biased sex ratio for adults than is differential shorebird predation on adult males. We demonstrate that biased sex ratios also appear to occur for newly hatched C. volutator, indicating that some form of asexual reproduction (e.g., automixis) may exist within Bay of Fundy populations of C. volutator.

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