scholarly journals Timing of larval release in the mole crab Emerita talpoida

1999 ◽  
Vol 183 ◽  
pp. 295-300 ◽  
Author(s):  
M Amend ◽  
A Shanks
Keyword(s):  
Larval Release ◽  
Emerita Talpoida

Larval Release Rhythm of the Mole Crab Emerita talpoida (Say)

2005 ◽  
Vol 209 (3) ◽  
pp. 194-203 ◽  
Author(s):  
Tracy A. Ziegler ◽  
Richard B. Forward
Keyword(s):  
Larval Release ◽  
Emerita Talpoida

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.

Entrainment of the activity rhythm of the mole crab Emerita talpoida

2007 ◽  
Vol 341 (1) ◽  
pp. 10-15 ◽  
Author(s):  
Richard B. Forward ◽  
Andrew D. Thaler ◽  
Rachel Singer
Keyword(s):  
Activity Rhythm ◽  
Emerita Talpoida

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.

Rhythms of larval release in the shore crab Carcinus maenas (Decapoda: Brachyura)

1997 ◽  
Vol 77 (2) ◽  
pp. 451-461 ◽  
Author(s):  
Chaoshu Zeng ◽  
Ernest Naylor
Keyword(s):  
High Tide ◽  
Carcinus Maenas ◽  
Continuous Light ◽  
Time Lapse ◽  
Shore Crab ◽  
Dark Phase ◽  
Larval Release ◽  
Natural Conditions ◽  
Video Recorder ◽  
The Times

The process of larval release in field collected ovigerous Carcinus maenas was monitored in the laboratory using a time-lapse video recorder. Under constant light (L:L) and simulated natural light/dark cycles (L:D), larval release normally occurred in two or more main events at about daily and/or tidal intervals. Since larval release in the crab was expressed with circadian and circatidal periodicity in continuous light and in the absence of tidal cues, it suggests involvement of endogenous timing. Crabs showing daily larval release rhythms released larvae at various times of the day in L:L. In contrast, under simulated L:D cycles, 37 out of 38 crabs released larvae during the dark phase, suggesting nocturnal release of larvae in the crab under natural conditions. Larval release from freshly collected females which shed larvae within two days of collection occurred predominantly around the times of expected nocturnal high tide. When both local semidiurnal high tides occurred in daylight during long summer days, larval release appeared to start 2–3 h earlier than the expected morning high tide, before the onset of daylight. Larval release at the time around high tide, linked to a previously described larval tidal migration rhythm of ebb-phased upward swimming, is likely to have been selected for by enhancing the larval offshore dispersal process. Nocturnal larval release is probably adaptive in the avoidance of visual predators by ovigerous females as they release larvae.

scholarly journals Seasonality of planktonic crustacean decapod larvae in the subtropical waters of Gran Canaria Island, NE Atlantic

2018 ◽  
Vol 82 (2) ◽  
pp. 119 ◽  
Author(s):  
José M. Landeira ◽  
Fernando Lozano-Soldevilla
Keyword(s):  
Canary Islands ◽  
Temporal Dynamics ◽  
Larval Abundance ◽  
Ne Atlantic ◽  
Crangon Crangon ◽  
Subtropical Region ◽  
Larval Release ◽  
Gran Canaria ◽  
Release Times ◽  
Decapod Larvae

A monitoring programme was established to collect plankton samples and information of environmental variables over the shelf off the island of Gran Canaria during 2005 and 2006. It produced a detailed snapshot of the composition and seasonal assemblages of the decapod larvae community in this locality, in the subtropical waters of the Canary Islands (NE Atlantic), where information about crustacean phenology has been poorly studied. The larval community was mainly composed of benthic taxa, but the contribution of pelagic taxa was also significant. Infraorders Anomura (33.4%) and Caridea (32.8%) accounted for more than half the total collected larvae. High diversity, relatively low larval abundance throughout the year and weak seasonality characterized the annual cycle. However, in relation to the temporal dynamics of temperature, two distinct larval assemblages (cold and warm) were identified that correspond to periods of mixing and stratification of the water column. The results also indicate that larval release times and durations in the subtropical waters are earlier and longer than at other higher latitudes in the NE Atlantic. We detected the presence of larvae of six species that have not yet been reported from the Canary Islands (Pandalina brevirostris, Processa edulis, Necallianasa truncata, Parapenaeus longirostris, Crangon crangon, Nematopagurus longicornis). Finally, this study provides a baseline for future comparisons with respect to fishery pressure and climate variability in this subtropical region.

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