Egg Production of the Copepod Acartia tonsa in Florida Bay during Summer. 1. The Roles of Food Environment and Diet

Kleppel, G. S.; Burkart, C. A.; Houchin, Lee; Tomas, Carmelo R.

doi:10.2307/1352479

Cited by 28 publications

(22 citation statements)

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“…day −1 ) were always higher than those measured in the field (1 to 16 eggs.female −1 .day −1 ) for A. tonsa (Kleppel et al 1998, Kleppel andHazzard 2000). For copepods fed on the same algae (T. weissflogii) under controlled conditions, the mean value observed for A. tonsa in the present study (28 eggs.female −1 .day −1 ) was slightly higher than that reported for A. clausi (21 to 26 eggs.…”

Section: Discussioncontrasting

confidence: 74%

Diet influence on egg production of the copepod Acartia tonsa (Dana, 1896)

Teixeira

Kaminski

Avila

et al. 2010

An. Acad. Bras. Ciênc.

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Egg production in the copepod Acartia tonsa was evaluated using different densities of the microalgae Thalassiosira weissflogii, Chaetoceros muelleri and Isochrysis galbana. Male and female were kept under controlled conditions (salinity 30, 20 • C, photoperiod 12L:12D), acclimated to the experimental conditions and left over a period of 24 h to allow copulation. Algal densities tested were equivalent in biovolume and corresponded to 0, 2.5, 5, 10, 20, 40 and 60.10 3 cells.mL −1 of T. weissflogii. Ten acclimated female were separated, transferred to glass bottles and exposed for further 24 h to the corresponding experimental medium. After this period, the eggs were fixed and counted. Copepod egg production reached a threshold value when T. weissflogii, C. muelleri and I. galbana were supplied at 10.10 3 , 140.10 3 and 640.10 3 cells.mL −1 , respectively. Mean egg production corresponded to 28.0 ± 0.5, 20.1 ± 1.0 and 22.0 ± 3.5 eggs.female −1 .day −1 , respectively. Copepods fed T. weissflogii showed the highest mean egg production while those fed I. galbana reached a maximum egg production when the algae were supplied at a density two-to fourfold higher, considering the biovolume of T. weissflogii and C. muelleri. These differences are explained considering the different sizes of the microalgae used to feed the copepods.

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Section: Discussioncontrasting

confidence: 74%

Diet influence on egg production of the copepod Acartia tonsa (Dana, 1896)

Teixeira

Kaminski

Avila

et al. 2010

An. Acad. Bras. Ciênc.

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“…Considering the exceptionally high feeding rates observed during this study (>100% body C d -1 ), higher rates of egg production would be expected (Kleppel et al 1998b, Kleppel & Hazzard 2000. Temperature-dependent models predict that, at typical Florida Bay temperatures, copepods will produce at least 20 eggs female -1 d -1 under nutritionally replete conditions (Kleppel et al 1996, Burkart 1998.…”

Section: Introductionmentioning

confidence: 84%

“…Eggs were not separated from adult copepods because cannibalism of eggs is rare in this species (Dagg 1977). In previous studies, A. tonsa consumed <3% of their eggs (Kleppel 1992, Kleppel et al 1998b). The bottles were incubated in situ for 24 h in translucent plastic boxes suspended just below the water's surface.…”

Section: Samplingmentioning

confidence: 96%

“…Egg production by copepods, including A. tonsa, has been found to be correlated with the ratio of 20:5ω-3 to 22:6ω-3 (Støttrup & Jensen 1990, Jónasdóttir 1994, Jónasdóttir et al 1995, Kleppel & Burkart 1995, although reasons for this correlation are not completely understood. Kleppel et al (1998b) found egg production rates by Acartia tonsa in Florida Bay to be low (5.8 to 14.2 eggs female -1 d -1…”

Section: Introductionmentioning

confidence: 95%

“…The bay is comprised of a network of shallow and well-mixed basins, with minimal vertical variability in temperature and food distributions (Fourqurean et al 1992). The phytoplankton assemblage varies between basins, allowing them to be compared as distinct 'microcosms' in studies of trophic dynamics (Burkart 1998, Kleppel et al 1998b). However, Florida Bay is also a perturbed system, where urban and agricultural development on the mainland over the past 50 yr have severely altered the bay's hydrology and chemistry.…”

Section: Introductionmentioning

confidence: 99%

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Egg production of the copepod Acartia tonsa in Florida Bay: role of fatty acids in the nutritional composition of the food environment

Hazzard¹,

Kleppel²

2003

Mar. Ecol. Prog. Ser.

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ABSTRACT:The relationship between copepod egg production (EP) and nutritional constituents of the seston was investigated in a variety of environments in Florida Bay. Seston samples were collected for analyses of protein, carbohydrate, lipid, and specific fatty acid concentrations, and egg production rates of the planktonic calanoid copepod Acartia tonsa were measured during 'non-bloom' conditions in January and May of 1998 near Rankin Key, during a diatom-dominated bloom in January of 1999 near Flamingo, and during a flagellate-dominated bloom in October of 1999 near Rabbit Key. Fatty acid concentrations were also measured in copepod adults and eggs off Rabbit Key. Egg production rates from Rankin Key were low (2.7 to 2.8 eggs female) compared with rates from the 'bloom' sites (25.0 to 56.3 eggs female -1 d -1 ). Concentrations of nutritional constituents in the seston were low off both Rankin Key and Flamingo, but significantly higher off Rabbit Key. Adult copepods contained high proportions of omega-3 fatty acids (18:3ω-3, 20:5ω-3, and 22:6ω-3), but of these only 18:3ω-3 was present in the eggs. Although EP varied independently of the concentrations of proteins, carbohydrates, lipids, and most fatty acids, it varied directly with the concentration of the 18:3ω-3 fatty acid.

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