Entrainment of the larval release rhythm of the crab Rhithropanopeus harrisii (Brachyura: Xanthidae) by cycles in salinity change

1986 ◽  
Vol 90 (4) ◽  
pp. 537-544 ◽  
Author(s):  
R. B. Forward ◽  
J. K. Douglass ◽  
B. E. Kenney
Keyword(s):  
Salinity Change ◽  
Larval Release ◽  
Rhithropanopeus Harrisii

Circadian Rhythm in Larval Release by the Crab Rhithropanopeus harrisii: Entrainment Model

2014 ◽  
Vol 226 (2) ◽  
pp. 92-101 ◽  
Author(s):  
Richard B. Forward ◽  
Bianca P. Moeller ◽  
Jonathan H. Cohen
Keyword(s):  
Circadian Rhythm ◽  
Larval Release ◽  
Rhithropanopeus Harrisii

Larval release in the crab Rhithropanopeus harrisii (Gould): chemical cues from hatching eggs

1985 ◽  
Vol 10 (4) ◽  
pp. 567-577 ◽  
Author(s):  
Dan Rittschof ◽  
Richard B. Forward ◽  
David D. Mott
Keyword(s):  
Chemical Cues ◽  
Larval Release ◽  
Rhithropanopeus Harrisii ◽  
Hatching Eggs

Larval Behavior and Protective Implications for Sea Scallops and Surf Clams within the Middle Atlantic Bight: Part Two, Variability of Physical Environment and Larval Behaviors

2019 ◽  
Vol 2 (2) ◽  
Keyword(s):  
Physical Environment ◽  
Climate Changes ◽  
Larval Growth ◽  
Growth Patterns ◽  
Larval Behavior ◽  
Larval Release ◽  
Physical Conditions ◽  
Climatic Variations ◽  
Middle Atlantic ◽  
Sea Scallops

Larval growth and settlement rates are important larval behaviors for larval protections. The variability of larval growthsettlement rates and physical conditions for 2006-2012 and in the future with potential climate changes was studied using the coupling ROMS-IMBs, and new temperature and current indexes. Forty-four experimental cases were conducted for larval growth patterns and release mechanisms, showing the spatial, seasonal, annual, and climatic variations of larval growthsettlement rates and physical conditions, demonstrating that the slight different larval temperature-adaption and larval release strategies made difference in larval growth-settlement rates, and displaying that larval growth and settlement rates highly depended upon physical conditions and were vulnerable to climate changes.

Tidal-amplitude rhythms of larval release: variable departure from presumed optimal timing among populations of the mottled shore crab

2010 ◽  
Vol 90 (5) ◽  
pp. 859-865 ◽  
Author(s):  
M. Bueno ◽  
A.A.V. Flores
Keyword(s):  
Comprehensive Evaluation ◽  
Natural Populations ◽  
Wave Action ◽  
Shore Crab ◽  
Optimal Timing ◽  
Rocky Shores ◽  
Tidal Amplitude ◽  
Larval Release ◽  
Underlying Mechanisms ◽  
Release Timing

It is widely assumed that optimal timing of larval release is of major importance to offspring survival, but the extent to which environmental factors entrain synchronous reproductive rhythms in natural populations is not well known. We sampled the broods of ovigerous females of the common shore crab Pachygrapsus transversus at both sheltered and exposed rocky shores interspersed along a 50-km coastline, during four different periods, to better assess inter-population differences of larval release timing and to test for the effect of wave action. Shore-specific patterns were consistent through time. Maximum release fell within 1 day around syzygies on all shores, which matched dates of maximum tidal amplitude. Within this very narrow range, populations at exposed shores anticipated hatching compared to those at sheltered areas, possibly due to mechanical stimulation by wave action. Average departures from syzygial release ranged consistently among shores from 2.4 to 3.3 days, but in this case we found no evidence for the effect of wave exposure. Therefore, processes varying at the scale of a few kilometres affect the precision of semilunar timing and may produce differences in the survival of recently hatched larvae. Understanding the underlying mechanisms causing departures from presumed optimal release timing is thus important for a more comprehensive evaluation of reproductive success of invertebrate populations.

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