Aspects of developmental and mortality rates in Calanus finmarchicus related to equiproportional development

Tande, KS

doi:10.3354/meps044051

Cited by 38 publications

(23 citation statements)

References 18 publications

(27 reference statements)

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“…Similarly, Bonnet et al (2009) found that C. helgolandicus did not grow very well at 9uC, while C. finmarchicus was observed to develop at 0uC (Tande 1988) in accordance with our model. We were not able to find any data in the literature on development time for the two species above 15uC.…”

Section: Discussionsupporting

confidence: 72%

The effect of changes in temperature and food on the development of Calanus finmarchicus and Calanus helgolandicus populations

Møller

Maar

Jónasdóttir

et al. 2012

Limnology & Oceanography

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We studied the response in development times of Calanus finmarchicus and Calanus helgolandicus to changes in temperature and food conditions. Grazing experiments were performed at different temperatures for both species, and the results were implemented in a stage-resolved zooplankton population model that predicted development times from biomass increments controlled by ingestion and metabolic losses. Predictions were validated against development data from the literature, and show that C. finmarchicus develops faster than C. helgolandicus below 11uC and slower above. The different relative development rates of the species are related to different temperature responses in ingestion rates. A temperature increase of 1uC to 2uC may have consequences for the relative contribution of C. helgolandicus and C. finmarchicus to the copepod community, and both seasonal and spatial displacements of the Calanus populations can be expected under climate change.

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Section: Discussionsupporting

confidence: 72%

The effect of changes in temperature and food on the development of Calanus finmarchicus and Calanus helgolandicus populations

Møller

Maar

Jónasdóttir

et al. 2012

Limnology & Oceanography

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“…(2) is clearly inapproFits of this function to the data of Tande (1988) at a rate or until it reaches the surface.…”

Section: O Inter-research 2000mentioning

confidence: 97%

Overwintering strategies in Calanus finmarchicus

Hind¹,

Gurney²,

Heath³

et al. 2000

Mar. Ecol. Prog. Ser.

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The marine copepod Calanus finmarchicus is known to overwinter at depth in a state analogous to diapause in terrestrial insects, but the cues which cause individuals to enter and leave this state are the subject of speculation. In this paper we use a simple demographic model, driven by environmental data from 4 distinct locations in the organism's eastern range, to test the plausibility of a number of candidate mechanisms. We start from Miller et al. 's (1991; Mar Ecol Prog Ser 72:79-91) hypothesis that diapause is controlled by photoperiod, and show that thls leads to unrealistic patterns of reproductive activity in northern waters. We extend the model to include the recently reported phenomenon (Hirche 1996a; Ophelia 44:lll-128) of delayed gonad maturation in females experiencing low food concentrations. This ylelds more plausible annual patterns, but falls to reproduce observed geographical variation in the timing of the yearly onset of reproductive activity. Our final model dispenses with photoperiodic control and assumes that diapause duration is controlled by the normal development processes operating at a reduced rate. This model reproduces all the qualitative features of the patterns of reproductive activity observed at our 4 test sites, thus demonstrating that photoperiod cueing is not a necessary prerequisite for the regular re-ascension of C. finmarchicus into surface waters.

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“…Stage development was represented by the continuous variable, c, whose value started at zero for newly spawned eggs and increased by 1 with each naupliar (NI-NVI) and copepodite (CI-CVI) moult stage to a maximum of 13. The rate of change of c with time was described by a sequence of stage-specific temperature-dependent rates of development (day 1 ), as derived from the data of Tande (1988) and Campbell (pers. comm.)…”

Section: Hindcast and Forecast Modelsmentioning

confidence: 99%

Comparative ecology of over-wintering Calanus finmarchicus in the northern North Atlantic, and implications for life-cycle patterns

HEATH¹

2004

ICES Journal of Marine Science

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. 2000. Comparative analysis of Calanus finmarchicus demography at locations around the Northeast Atlantic.Standardized time-series sampling was carried out throughout 1997 at seven locations around the Northeast Atlantic to investigate regional variations in the seasonal demography of Calanus finmarchicus. Sites ranged from an inshore location in the North Sea, where C. finmarchicus formed only a small component of the zooplankton (<10 mgC m 2 during spring and early summer), to the shelf south of Iceland, and Weathership M in the Norwegian Sea, where the species dominated the zooplankton (>2000 mgC m 2 during spring and summer). The internal consistency of the demographic time series from each site was investigated by three partial models of life-cycle processes. In general, the demography of late copepodites could be accounted for by a relatively simple forecast model of stage development and diapause. However, there was a large discrepancy between nowcast estimates of egg production based on female abundance, temperature, and chlorophyll, and hindcast simulations of the egg production required to account for the observed abundance of early copepodite stages. The results point to a gap in our understanding of seasonal variations in rates of egg production and/or survival of nauplii. Overall, the population sampled at Weathership M appeared to be reasonably self-contained, but all other sites were reliant on invasion of overwintered stock in spring. At least two generations were observed at all but one site, but the extent to which these were generated by discrete bursts of egg production varied between sites and seemed to be partly dependent on the proximity to an overwintering location.

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Aspects of developmental and mortality rates in Calanus finmarchicus related to equiproportional development

Cited by 38 publications

References 18 publications

The effect of changes in temperature and food on the development of Calanus finmarchicus and Calanus helgolandicus populations

The effect of changes in temperature and food on the development of Calanus finmarchicus and Calanus helgolandicus populations

Overwintering strategies in Calanus finmarchicus

Comparative ecology of over-wintering Calanus finmarchicus in the northern North Atlantic, and implications for life-cycle patterns

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