Timing of diapause in relation to the onset of winter in the high-latitude copepods Pseudocalanus acuspes and Acartia longiremis

Mf, Norrbin

doi:10.3354/meps142099

Cited by 31 publications

(15 citation statements)

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“…Saunders 1971, Watson & Smallman 1971, Hairston & Kearns 1995. It is worth noting that the environmental cues (token stimulus) are different from the ultimate cause of selection (selective environment) (Mayr 1961, Norrbin 1996, Nijhout 2003, and that my model results reflect more on the ultimate cause, although it can help derive possible environmental cues.One of the key assumptions in the present study is that Calanus finmarchicus has a strategy of reducing the risk of catastrophic failure in adverse environmental conditions. Since the diapause for C. finmarchicus occurs at the C5 stage, its risk-reducing strategy is likely to be different from the bet-hedging strategy used by egg-diapausing species who can produce either diapausing or non-diapausing eggs (e.g.…”

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confidence: 81%

Calanus finmarchicus diapause initiation: new view from traditional life history-based model

Ji¹

2011

Mar. Ecol. Prog. Ser.

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Organisms have evolved to optimally align the timing of diapause with the seasonality of environmental conditions in order to maximize their fitness. Observations from the Northwest Atlantic suggest that Calanus finmarchicus diapause initiation date varies significantly by geographic location, inconsistent with patterns of seasonal changes of any single environmental factor such as photoperiod, sea surface temperature, or food availability. In the present study, a life history-based model was used to reconcile the apparent inconsistency. The model results suggest that (1) the induction of diapause involves multiple environmental factors as a result of fitness maximization, and (2) in addition to temperature and food condition, predation pressure is another key factor that could affect diapause initiation process. It is further suggested that phenotypic plasticity is likely to be the major source of variation in the timing of diapause initiation for C. finmarchicus. KEY WORDS: Calanus finmarchicus · Diapause · Life history · Fitness Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 440: [105][106][107][108][109][110][111][112][113][114] 2011 be achieved if individuals start diapause whenever they are physiologically ready. For instance, the Calanus finmarchicus population in the Gulf of Maine is known to have 2 or more generations (Meise & O'Reilly 1996, Durbin et al. 1997, Miller et al. 2000. Based on the LAW hypothesis, the reason for some of the first-generation individuals not entering diapause remains not very clear. Those first-generation individuals may be capable, and have an option, of shifting energy from active development and reproduction to lipid storage in preparation for diapause. This suggests that factors other than physiological constraint may play a role in the diapause initiation process.In the present study, it is hypothesized that (1) the induction of diapause indeed involves the interaction of multiple environmental factors, but this is due to fitness maximization rather than physiological constraints; and (2) in addition to temperature and food condition, predation pressure is another key environmental factor that could affect the diapause initiation process. The focus of the present study is on the ultimate cause of selection rather than a direct mechanistic modeling on behavioral responses to environmental cues. The approach used to test the hy potheses is based on the theoretic framework developed for explaining dormancy strategy from a life history theory point of view (e.g. Levins 1968, 1969, Cohen 1970. Although this framework was developed many years ago, new insights can still be gained by using recently observed species-specific vital rates and diapause pattern. The objective here is to reconcile the apparent inconsistency between the observed patterns of diapause onset with induction of diapause by any single observed environmental cue. This would then provide a valuable understanding of the relationship between environm...

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confidence: 81%

Calanus finmarchicus diapause initiation: new view from traditional life history-based model

Ji¹

2011

Mar. Ecol. Prog. Ser.

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“…was also observed in the White Sea (Pertsova 1981). Norrbin (Norrbin et al 1990;Norrbin 1996) suggested that it is less a continuous process, triggered by the physiological state as proposed by McLaren et al (1989), but rather a speciWc switching date, at which P. acuspes copepodids stop maturation but proceed to accumulate lipids. Klein Breteler and Gonzalez (1988) suspected that changes to poor food conditions are necessary to induce hormonal cessation of development in favor of lipid production.…”

Section: Onset Of Overwinteringmentioning

confidence: 99%

“…Pseudocalanus acuspes mainly inhabits high latitudes (Frost 1989;Runge and Ingram 1991;Siferd and Conover 1992;Norrbin 1996) and due to its absence in the adjacent North Sea (Bucklin et al 2003) and wide distribution in the Arctic, it is most likely a member of the Baltic glacial relict fauna. DiVerent life cycles were described for Pseudocalanus spp.…”

Section: Introductionmentioning

confidence: 99%

Trophodynamics and seasonal cycle of the copepod Pseudocalanus acuspes in the Central Baltic Sea (Bornholm Basin): evidence from lipid composition

et al. 2006

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Seasonal lipid dynamics of the copepod Pseudocalanus acuspes were studied in the Bornholm Basin (Central Baltic Sea) on a monthly basis from March 2002 until March 2003 and were interpreted in light of life cycle strategies and diet selection. The individual total lipid content of females ranged from 0.9 to 1.8 g, with relative wax ester content reaching a signiWcant maximum in May (44% of total lipids) and minimum (17% of total lipids) in April and November. SigniWcant changes in size, lipid content, lipid classes and fatty acid composition of structural as well as storage lipids suggested Wve characteristic seasonal phases that were induced by diVerent feeding histories and environmental conditions. Storage lipids were characterized by 18:1(n¡9) as major component, which ranged between 44% of total fatty acids in June and 23% in February. The strong coherence between 18:1(n¡9) in the seston lipids and the occurrence of ciliates emphasized the importance of ciliates in the diet of P. acuspes. As indicated by changes in the amounts of fatty acid markers, other food sources varied over the year, suggesting an opportunistic feeding behavior. The spring period was characterized by an increase in typical diatom and dinoXagellate markers, whereas other sources, potentially cyanobacteria, became more important during summer. The life cycle strategy is discussed with respect to extant adaptations to high latitudinal habitats.

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“…December through May, (Christiansen 1988)]. Acartia longiremis females undergo dormancy during winter (Davis 1976;Norrbin 1996) while A. bifilosa is adapted to colder temperatures (Schnack 1975) and oversummers as resting eggs (RE) in the North Sea (Chinnery and Williams 2003). Acartia tonsa is originally a tropical species and has been reported in the Baltic since the 1930s (Brylinski 1981 and references therein).…”

Section: Acartia Spp In the Baltic Seamentioning

confidence: 99%

Environmental cues and constraints affecting the seasonality of dominant calanoid copepods in brackish, coastal waters: a case study of Acartia, Temora and Eurytemora species in the south-west Baltic

Diekmann¹,

Clemmesen

John

et al. 2012

Mar Biol

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Information on physiological rates and tolerances helps one gain a cause-and-effect understanding of the role that some environmental (bottom-up) factors play in regulating the seasonality and productivity of key species. We combined the results of laboratory experiments on reproductive success and field time series data on adult abundance to explore factors controlling the seasonality of Acartia spp., Eurytemora affinis and Temora longicornis, key copepods of brackish, coastal and temperate environments. Patterns in laboratory and field data were discussed using a metabolic framework that included the effects of 'controlling', 'masking' and 'directive' environmental factors. Over a 5-year period, changes in adult abundance within two south-west Baltic field sites (Kiel Fjord Pier, 54°19 0 89N, 10°09 0 06E, 12-21 psu, and North/Baltic Sea Canal NOK, 54°20 0 45N, 9°57 0 02E, 4-10 psu) were evaluated with respect to changes in temperature, salinity, day length and chlorophyll a concentration. Acartia spp. dominated the copepod assemblage at both sites (up to 16,764 and 21,771 females m -3 at NOK and Pier) and was 4 to 10 times more abundant than E. affinis (to 2,939 m -3 at NOK) and T. longicornis (to 1,959 m -3 at Pier), respectively. Species-specific salinity tolerance explains differences in adult abundance between sampling sites whereas phenological differences among species are best explained by the influence of species-specific thermal windows and prey requirements supporting survival and egg production. Multiple intrinsic and extrinsic (environmental) factors influence the production of different egg types (normal and resting), regulate life-history strategies and influence match-mismatch dynamics.

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Timing of diapause in relation to the onset of winter in the high-latitude copepods Pseudocalanus acuspes and Acartia longiremis

Cited by 31 publications

References 14 publications

Calanus finmarchicus diapause initiation: new view from traditional life history-based model

Calanus finmarchicus diapause initiation: new view from traditional life history-based model

Trophodynamics and seasonal cycle of the copepod Pseudocalanus acuspes in the Central Baltic Sea (Bornholm Basin): evidence from lipid composition

Environmental cues and constraints affecting the seasonality of dominant calanoid copepods in brackish, coastal waters: a case study of Acartia, Temora and Eurytemora species in the south-west Baltic

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