Selective feeding of Eurytemora affinis (Copepoda, Calanoida) in temperate estuaries: model and field observations

Tackx, M.; Herman, Peter M. J.; Gasparini, Stéphane; Irigoien, Xabier; Billiones, Raquel; Daro, M.H.

doi:10.1016/s0272-7714(02)00182-8

Cited by 87 publications

(49 citation statements)

References 34 publications

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“…Similarly, the majority of T. longicornis was found at Chl a concentrations \5 lg L -1 . Finally, despite reports that E. affinis is able to effectively select food in turbid conditions (Gasparini and Castel 1997, study site: Gironde estuary; Tackx et al 2003, study site: North Sea) most samples containing E. affinis in our study were collected when Chl a was [5 lg L -1 . Although such threshold concentrations of Chl a are interesting to compare between species and years, it is important to note that Chl a is only a proxy of the available prey resources available to copepods.…”

Section: Reproductive Rate and Survivalmentioning

confidence: 60%

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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Section: Reproductive Rate and Survivalmentioning

confidence: 60%

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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“…The taxonomic and biochemical complexity of the trophic oceanic environment makes it difficult to apply these concepts to copepod feeding (Kleppel 1992). There are attempts to trace copepod diets by the study of their feeding behavior (Tackx et al 2003), the direct examination of diets in their gut (Nishida and Ohtsuka 1996;Wu et al 2004), or the examination of their fecal pellets (Turner et al 2001). However, gut and fecal pellet studies seem not to be a reliable way to determine the composition of copepod food since digestion can be very rapid and many food sources have no skeletal remains that could be retrieved.…”

Section: Introductionmentioning

confidence: 99%

Copepod feeding study in the upper layer of the tropical South China Sea

et al. 2009

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The South China Sea (SCS) is the world's largest marginal sea being notable for vertical mixing at various scales resulting in a sequence of chemical and biological dynamics in surface waters. We investigated the ingestion, gut content, evacuation and clearance rates of copepods collected from six stations (including a South East Asia Time Series station) along a transect line in the tropical of a SCS cruise during September 27, 1999 to October 2, 1999. The goal of the present study was to understand the feeding ecology of copepods in the upper water layers (0-5 m) of the northern SCS during autumn. We measured the gut pigment contents of 33 copepod species by the gut fluorescence method. The gut chlorophyll a values of most small size copepods (\1 mm) were lower than 1.00 ng Chl a individual -1 . The highest gut pigment content was recorded in Scolecithrix danae (7.07 ng Chl a individual -1 ). The gut pigment contents of 33 copepod species (including 70 samples and 1,290 individuals) estimated is negatively correlated with seawater temperature (Pearson correlation r = -0.292, P = 0.014) and is positively correlated with the chlorophyll a concentration of ambient waters (Pearson correlation r = 0.243, P = 0.043). Mean gut pigment content, ingestion and clearance rates (from 80 samples and 1,468 individuals) show that larger copepods ([2 mm) had significantly higher values than medium sized copepods (1-2 mm) and smaller sized copepods. The present study shows that the performance of feeding on phytoplankton was variable in different sized copepod groups, suggesting that copepods obtained in the tropical area of the southeastern Taiwan Strait might be opportunistic feeders.

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“…During the summer, when temperatures are close to 20°C, the E. affinis population is gradually replaced by Acartiidae (Acartia bifolosa Giesbrecht, 1881, then Acartia tonsa Dana, 1849), as observed in other estuaries (Escaravage & Soetaert 1995;David et al 2007). E. affinis generally plays also an important role in the food web of the estuarine zones it inhabits, because it is one of the major consumers of phytoplankton and detritus, and one of the most abundant preys for predators such as mysids, shrimps and fishes (Tackx et al 2003;Dauvin & Desroy 2005).…”

Section: Introductionmentioning

confidence: 99%

Effects of photoperiod on egg production inEurytemora affinisPoppe, 1880 (Copepoda: Calanoida) from the Seine Estuary (France)

Glippa

Alekseev

Souissi

2013

Italian Journal of Zoology

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The calanoid copepod Eurytemora affinis Poppe, 1880 is the most abundant species of the mesozooplanktonic community of the Seine estuary (France) in the lower salinity zone. Diapausing eggs of this species have been found in the sediment of this estuary but they are few in comparison with those found for other calanoid species. We thus decided to test the effect of photoperiod on diapausing egg production in E. affinis from the Seine estuary. For this, an experimental device has been developed. A combination of five photoperiods and two temperatures was used and the production of eggs was studied for the first and the second clutch. The production of diapausing eggs was demonstrated under photoperiodic conditions less than or equal to 12 h of light either at 12 or 16°C with a maximum under constant darkness (6%). A significant increase in the number of non-viable eggs was also observed between the first and the second clutch for all tested conditions and this may be due to the non-fertilization of these eggs. We also verified that the late naupliar instars are sensitive to the photoperiodic signal.The experimental approach has revealed that the production of diapausing eggs in the key species to the downstream Seine estuary, E. affinis, could be induced by short days, but photoperiod was probably not the only factor responsible for the induction of diapausing egg production. The percentage of diapausing eggs obtained under the induction experiment is similar to that obtained from the eggs extracted from the sediment of the Seine estuary (7%). The strategy of E. affinis in this estuary would be to constitute an egg bank, acting as long-term survival or in the case of adverse conditions. The role of geographical position (mainly latitude) and local conditions in the reproductive strategy of E. affinis is discussed.

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Selective feeding of Eurytemora affinis (Copepoda, Calanoida) in temperate estuaries: model and field observations

Cited by 87 publications

References 34 publications

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

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

Copepod feeding study in the upper layer of the tropical South China Sea

Effects of photoperiod on egg production inEurytemora affinisPoppe, 1880 (Copepoda: Calanoida) from the Seine Estuary (France)

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