scholarly journals Density-dependent growth of bivalves dominating the intertidal zone of Banc d’Arguin, Mauritania: importance of feeding mode, habitat and season

2019 ◽  
Vol 610 ◽  
pp. 51-63 ◽  
Author(s):  
M van der Geest ◽  
JAC van der Lely ◽  
JA van Gils ◽  
T Piersma ◽  
T Lok
Keyword(s):  
Intertidal Zone ◽  
Feeding Mode ◽  
Density Dependent ◽  
Banc D’Arguin ◽  
Dependent Growth ◽  
Banc D'arguin

Manila Clam (Ruditapes Philippinarum) Culture in Oyster Bags: Influence of Density on Survival, Growth and Biometric Relationships

1998 ◽  
Vol 78 (2) ◽  
pp. 551-560 ◽  
Author(s):  
J. Cigarría ◽  
J. Fernández
Keyword(s):  
Intertidal Zone ◽  
Shell Height ◽  
Live Weight ◽  
Ruditapes Philippinarum ◽  
Manila Clam ◽  
The Other ◽  
Density Dependent ◽  
Temporary Storage ◽  
Dependent Growth ◽  
Reduced Density

In order to establish the suitability of oyster bags as a method for Manila clam culture, Ruditapes philippinarum (Mollusca: Bivalvia), five batches of clams (mean live weight 0·55 g) were placed on the ground in the intertidal zone of Eo Estuary in March 1993. Four batches were sown in bags at different densities (100, 250, 500 and 1000 clams per bag) and one sown at 160 clams per m2 in sand–gravel bed covered with plastic netting.In August 1993 and April 1994 all batches were picked up and survival, live weight, length, height and thickness recorded. Survival of clams at the highest density was significantly lower than survival at lower densities in August 1993 (60·5%) and April 1994 (26·7%), but no differences were found among the other treatments. In addition, we found differences in growth between sets in both dates, with the best growth in the lower densities and reduced, density-dependent growth in the bags. Biometric relationships were also affected by density at the end of the experiment. High density had a greater influence on reducing shell height than on length or thickness.It was concluded that traditional ground culture in Europe is, from both the biological and the economical viewpoints, more efficient than oyster bag culture. However, oyster bags may be useful for temporary storage or as nursery system for clams.

Fouille de la butte de FA 10 (Banc d'Arguin) et son apport à la connaissance de la culture épipaléolithique de Foum Arguin, nord-ouest du Sahara

2007 ◽  
Vol 5 (1) ◽  
pp. 17-45 ◽  
Author(s):  
Robert Vernet ◽  
Marcel Ott ◽  
Liliane Tarrou ◽  
Annabelle Gallin ◽  
Jade Géoris-Creuseveau
Keyword(s):  
Banc D’Arguin ◽  
Banc D'arguin

scholarly journals The spatial scale of density-dependent growth and implications for dispersal from nests in juvenile Atlantic salmon

Oecologia ◽  
2010 ◽  
Vol 165 (4) ◽  
pp. 959-969 ◽  
Author(s):  
Sigurd Einum ◽  
Grethe Robertsen ◽  
Keith H. Nislow ◽  
Simon McKelvey ◽  
John D. Armstrong
Keyword(s):  
Atlantic Salmon ◽  
Spatial Scale ◽  
Density Dependent ◽  
Juvenile Atlantic Salmon ◽  
Dependent Growth

Suppression of fibrinolysin T activity fails to restore density-dependent growth inhibition to SV3T3 cells

Nature ◽  
1974 ◽  
Vol 250 (5469) ◽  
pp. 739-741 ◽  
Author(s):  
IIH-NAN CHOU ◽  
PAUL H. BLACK ◽  
RICHARD O. ROBLIN
Keyword(s):  
Growth Inhibition ◽  
Density Dependent ◽  
Dependent Growth

Do abiotic mechanisms determine interannual variability in length-at-age of juvenile Arcto-Norwegian cod?

2002 ◽  
Vol 59 (1) ◽  
pp. 57-65 ◽  
Author(s):  
Geir Ottersen ◽  
Kristin Helle ◽  
Bjarte Bogstad
Keyword(s):  
Growth Rates ◽  
Gadus Morhua ◽  
Barents Sea ◽  
Water Masses ◽  
Inverse Relation ◽  
Lower Growth ◽  
Density Dependent ◽  
The Barents Sea ◽  
The Mean ◽  
Dependent Growth

For the large Arcto-Norwegian stock of cod (Gadus morhua L.) in the Barents Sea, year-to-year variability in growth is well documented. Here three hypotheses for the observed inverse relation between abundance and the mean length-at-age of juveniles (ages 1–4) are suggested and evaluated. Based on comprehensive data, we conclude that year-to-year differences in length-at-age are mainly determined by density-independent mechanisms during the pelagic first half year of the fishes' life. Enhanced inflow from the southwest leads to an abundant cohort at the 0-group stage being distributed farther east into colder water masses, causing lower postsettlement growth rates. We can not reject density-dependent growth effects related to variability in food rations, but our data do not suggest this to be the main mechanism. Another hypothesis suggests that lower growth rates during periods of high abundance are a result of density-dependent mechanisms causing the geographic range of juveniles to extend eastwards into colder water masses. This is rejected mainly because year-to-year differences in mean length are established by age 2, which is too early for movements over large distances.

Banc d’Arguin (Mauritania)

2016 ◽  
pp. 1-14
Author(s):  
Antonio Araujo ◽  
Pierre Campredon
Keyword(s):  
Banc D’Arguin ◽  
Banc D'arguin
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