scholarly journals Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, in the Labrador Sea: 1997–2010

2012 ◽  
Vol 35 (2) ◽  
pp. 281-298 ◽  
Author(s):  
Erica J. H. Head ◽  
Leslie R. Harris ◽  
Marc Ringuette ◽  
Robert W. Campbell
Keyword(s):  
Egg Production ◽  
Calanus Finmarchicus ◽  
Labrador Sea ◽  
Planktonic Copepod

Characteristics of egg production of the planktonic copepod, Calanus finmarchicus, on Georges Bank: 1994–1999

2006 ◽  
Vol 53 (23-24) ◽  
pp. 2618-2631 ◽  
Author(s):  
J.A. Runge ◽  
S. Plourde ◽  
P. Joly ◽  
B. Niehoff ◽  
E. Durbin
Keyword(s):  
Egg Production ◽  
Calanus Finmarchicus ◽  
Georges Bank ◽  
Planktonic Copepod

Egg production rates of Calanus finmarchicus in the Northwest Atlantic (Labrador Sea)

1997 ◽  
Vol 54 (6) ◽  
pp. 1270-1279 ◽  
Author(s):  
J Cabal ◽  
L R Harris ◽  
EJH Head
Keyword(s):  
Egg Production ◽  
Population Characteristics ◽  
Calanus Finmarchicus ◽  
Labrador Sea ◽  
Production Rates ◽  
In Situ Conditions ◽  
Different Types ◽  
Series Of Experiments

Egg production rates and population characteristics of Calanus finmarchicus were examined in the Labrador Sea during the spring of 1994. Several experiments were conducted in order to compare egg production rates and clutch size using different types of container and in the presence and absence of food. In one series of experiments, individual females were incubated either in petri dishes or in polycarbonate bottles (80 mL) in filtered seawater. In these experiments, clutch sizes and egg production rates were not significantly different. In a second series of experiments, groups of 20 females were placed in containers under three sets of conditions: in the presence of food and with a screen to separate copepods from their eggs (FSCREEN), in the presence of food without a screen (FOOD), and in filtered seawater without a screen (FSW). Average egg production rates of female C. finmarchicus were significantly higher in the FSCREEN treatments than in either of the other two. In these experiments, egg production rates were not obviously related to ingestion rates, and these in vitro observations together with observations of in situ conditions suggest that stored reserves may have been used to fuel, or supplement, reproduction in C. finmarchicus in this area.

Egg production of Calanus finmarchicus : effect of temperature, food and season

1997 ◽  
Vol 127 (4) ◽  
pp. 609-620 ◽  
Author(s):  
H.-J. Hirche ◽  
U. Meyer ◽  
B. Niehoff
Keyword(s):  
Egg Production ◽  
Calanus Finmarchicus ◽  
Effect Of Temperature

Importance of Feeding, Direct Uptake from Seawater, and Transfer from Generation to Generation in the Accumulation of an Organochlorine (p,p′-DDT) by the Marine Planktonic Copepod Calanus finmarchicus

1981 ◽  
Vol 38 (1) ◽  
pp. 101-119 ◽  
Author(s):  
Gareth C. Harding ◽  
W. Peter Vass ◽  
Ken F. Drinkwater
Keyword(s):  
Equilibrium Concentration ◽  
Calanus Finmarchicus ◽  
Planktonic Copepod ◽  
Model Simulations ◽  
Marine Copepod ◽  
Planktonic Crustaceans

The accumulation of an organochlorine by the marine copepod Calanus finmarchicus, through feeding on contaminated phytoplankton, 14C-p,p′-DDT labeled Thalassiosira weisflogii, was measured. At "normal" densities, ≈ 60 μg C/L, the copepod retained 60–70% of the DDT ingested following gut egestion, but under "bloom" conditions, ≈ 600 μg C/L, retained as little as 10%. These results enable us to incorporate feeding and generation transfer terms into an earlier model of DDT flux between seawater and planktonic crustaceans. Model simulations indicate that it is not necessary to invoke direct uptake from seawater to arrive at published levels of ΣDDT in copepods, even when our lowest experimental DDT feeding efficiencies are used. We predict that the potential for rapidly developing Calanus to accumulate DDT from generation to generation will reach an equilibrium concentration after 12 generations but that an alternating equilibrium of generations will occur within four generations in a two-season temperature environment.Key words: p,p′-DDT, uptake, clearance, feeding, assimilation, copepods, Calanus finmarchicus

Limitation of egg production in Calanus finmarchicus in the field: A stoichiometric analysis

2009 ◽  
Vol 78 (4) ◽  
pp. 511-517 ◽  
Author(s):  
Daniel J. Mayor ◽  
Thomas R. Anderson ◽  
David W. Pond ◽  
Xabier Irigoien
Keyword(s):  
Egg Production ◽  
Calanus Finmarchicus ◽  
Stoichiometric Analysis

Life cycle of Calanus finmarchicus in the lower St. Lawrence Estuary: the imprint of circulation and late timing of the spring phytoplankton bloom

2001 ◽  
Vol 58 (4) ◽  
pp. 647-658 ◽  
Author(s):  
Stéphane Plourde ◽  
Pierre Joly ◽  
Jeffrey A Runge ◽  
Bruno Zakardjian ◽  
Julian J Dodson
Keyword(s):  
Population Dynamics ◽  
Life Cycle ◽  
Production Rate ◽  
Egg Production ◽  
Phytoplankton Bloom ◽  
Food Limitation ◽  
Calanus Finmarchicus ◽  
Lawrence Estuary ◽  
Egg Production Rate ◽  
St Lawrence Estuary

The life cycle of Calanus finmarchicus in the lower St. Lawrence estuary is described based on observations of female egg production rate, population stage abundance, and chlorophyll a biomass collected over 7 years (1991–1997) at a centrally located monitoring station. The mean seasonal pattern shows maximum abundance of females in May, but peak population egg production rate and naupliar (N3–N6) abundance occur in early July just after onset of the late spring – early summer phytoplankton bloom. The population stage structure is characterized by low summer abundance of early copepodite stages C1–C3 and high stage C5 abundance in autumn. Between 1994 and 1997, there was important interannual variation in both timing (up to 1 month) and amplitude (five- to eight-fold) of population reproduction. Patterns of seasonal increase of C5 abundance in autumn suggest interannual variations of both timing and magnitude of deep upstream advection of this overwintering stage. Thus, the main features of C. finmarchicus population dynamics in the central lower St. Lawrence Estuary are (i) late reproduction resulting from food limitation prior to the onset of the summer phytoplankton bloom, (ii) probable export of early developmental stages during summer, and (iii) advection into the central lower St. Lawrence Estuary of overwintering stage C5 in autumn from downstream regions. These results support the hypothesis that circulation, mainly driven by discharge from the St. Lawrence River and its tributaries, is a key factor governing population dynamics of C. finmarchicus in this region.

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