A model for growth of Artemia franciscana cultures based on food ration-dependent gross growth efficiencies

Abreu-Grobois, F. Alberto; Briseño-Dueñas, Raquel; Herrera, Marcelino; Malagón, M. L.

doi:10.1007/978-94-011-3366-1_5

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…The maximum level of AA attained by 1.5 mm Artemia within a 24‐h period was achieved with a dose rate of 1.2 g A2P L −1 day −1 , which is less than the calculated maximum ingestion rate [i.r. (max) ] of 2.0 g A2P L −1 day −1 (Abreu‐Grobois et al. 1991) where; i.r.…”

Section: Discussionmentioning

confidence: 99%

“…To maintain the same Artemia biomass at each size, calculations were based on the following individual Artemia size and dw: 1.0 mm and 2.95 g, 1.5 mm and 6.05 μ g and 2.5 mm and 17.66 μ g, and were derived from Abreu‐Grobois et al. (1991), where len is the length of Artemia from the anterior of the head to the anus.…”

Section: Experiments 2: Ascorbic Acid Assimilation and Depletionmentioning

confidence: 99%

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Uptake and metabolism of a particulate form of ascorbic acid by Artemia nauplii and juveniles

2004

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A study was conducted to establish whether a particulate form of ascorbic acid (AA), ascorbyl‐2‐phosphate (A2P), could be used to enrich Artemia. In the first experiment, we examined the efficiency of A2P conversion to and maintenance of AA by juvenile Artemia (1.5 mm, 5‐day‐old) held at 9000 L−1 and 28 °C for 24 h. Maximal uptake and assimilation was >10 000 μg AA g−1 dry weight (dw) (representing >1%Artemia dw) at enrichment rates of ≥1.2 g A2P L−1. In the second experiment, a similar biomass of instar II/III nauplii (1 mm, 2‐day‐old) and juvenile (2.5 mm, 8‐day‐old) Artemia were enriched for 6 or 24 h at 28 °C before starvation for 6 or 24 h at 18 or 28 °C. At 0 h and after 6 and 24 h enrichment, AA levels were 485, 3468 and 11 080 μg g−1 dw in nauplii and 122, 4286 and 12 470 μg g−1 dw in juveniles. When Artemia nauplii or juveniles were enriched for 6 h and starved for 6 h at 18 or 28 °C, there was no significant reduction in AA. Continuation of starvation to 24 h at 18 and 28 °C reduced the level of AA to 3367 and 2482 μg g−1 dw in nauplii and 3068 and 2286 μg g−1 dw in juveniles. After 24 h enrichment, 6 h of starvation at 18 and 28 °C reduced AA to 8847 and 7899 μg g−1 dw in nauplii and to 9053 and 8199 μg g−1 dw in juveniles. Continuation of starvation to 24 h at 18 and 28 °C further reduced AA levels in nauplii to 6977 and 4078 μg g−1 dw and to 7583 and 5114 μg g−1 dw in juveniles. This study demonstrated that A2P could be assimilated as AA in the body tissue of different‐sized Artemia in a dose‐dependant manner and AA was depleted during starvation depending on time and temperature.

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Section: Discussionmentioning

confidence: 99%

Section: Experiments 2: Ascorbic Acid Assimilation and Depletionmentioning

confidence: 99%

Uptake and metabolism of a particulate form of ascorbic acid by Artemia nauplii and juveniles

2004

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“…Un‐hatched eggs were siphoned off from the cultures. The average length of Artemia nauplii was 454 μm, and the dry weight was 1.0 μg/individual, estimated from Abreu‐Grobois, Briseno‐Duenas, Herrera, and Malagon ().…”

Section: Methodsmentioning

confidence: 99%

Stabilizing mechanisms in a food web with an introduced omnivore

Granados

Duffy

McKindsey

et al. 2017

Ecology and Evolution

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Intraguild predation (IGP) is an omnivorous food web configuration in which the top predator consumes both a competitor (consumer) and a second prey that it shares with the competitor. This omnivorous configuration occurs frequently in food webs, but theory suggests that it is unstable unless stabilizing mechanisms exist that can decrease the strength of the omnivore and consumer interaction. Although these mechanisms have been documented in native food webs, little is known about whether they operate in the context of an introduced species. Here, we study a marine mussel aquaculture system where the introduction of omnivorous mussels should generate an unstable food web that favors the extinction of the consumer, yet it persists. Using field and laboratory approaches, we searched for stabilizing mechanisms that could reduce interaction strengths in the food web. While field zooplankton counts suggested that mussels influence the composition and abundance of copepods, stable isotope results indicated that life‐history omnivory and cannibalism facilitated the availability of prey refugia, and reduced competition and the interaction strength between the mussel omnivore and zooplankton consumers. In laboratory experiments, however, we found no evidence of adaptive feeding which could weaken predator–consumer interactions. Our food web study suggests that the impact of an introduced omnivore may not only depend on its interaction with native species but also on the availability of stabilizing mechanisms that alter the strength of those interactions.

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