Role of diatoms in copepod production:good, harmless or toxic?

Jónasdóttir, S. H.; Kiørboe, Thomas; Tang, K.; StJohn, M.; Visser, A.J.C. de; Saiz, Enric; Dam, H.

doi:10.3354/meps172305

Cited by 99 publications

(75 citation statements)

References 14 publications

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“…As an alternative, some authors have argued that poor copepod egg production and egg viability result from nutritional inadequacies rather than teratogens in diatom diets of egg-producing female copepods (Jónasdóttir et al 1998). Numerous correlations have been found between copepod fecundity and various elemental and biochemical components of maternal diets such as carbon, nitrogen, protein, carbohydrate, amino acid, and fatty acid content (Jónasdóttir 1994, Pond et al 1996, Kleppel et al 1998a,b, Koski et al 1998.…”

Section: Main Contributors: J T Turner and G S Kleppelmentioning

confidence: 99%

Colloquium on diatom-copepod interactions

Paffenhöfer¹,

Ianora²,

Miralto³

et al. 2005

Mar. Ecol. Prog. Ser.

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From 3 to 6 November 2002, a colloquium was convened at the Benthos Laboratory of the Stazione Zoologica Anton Dohrn on Ischia, Italy, with the goal of evaluating the present status of the effects of diatoms on their main consumers, planktonic copepods, and to develop future research strategies to enhance our understanding of such interactions. These included (1) toxic effects of diatom metabolites on copepods, particularly reproduction, and (2) nutritional effects of diatoms on juvenile to adult copepods. Key issues involved in the impact of diatoms on the dynamics of natural plankton communities in situ were also addressed. During the plenary session, the most recent advances on this topic were presented. The plenary session was followed by 3 working groups on (1) production of aldehydes by phytoplankton, (2) toxic and nutritional effects of diatoms on zooplankton, and (3) the chemistry of diatom defense, as well as of their nutritional quality. These working groups focused on suggesting future research needs for the different topics. As a result, several recommendations were outlined, including experimental studies. It became evident that interdisciplinary efforts are needed, involving chemists, oceanographers and experimentalists, since many of the biological observations under controlled conditions and in situ require an integrated approach, including chemical causation. Extensive field observations based on common protocols are also recommended for investigation of the intrinsic variability of such effects and their environmental controls. Laboratory experiments are seen to be essential for the full understanding of environmentally occurring processes.

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Section: Main Contributors: J T Turner and G S Kleppelmentioning

confidence: 99%

Colloquium on diatom-copepod interactions

Paffenhöfer¹,

Ianora²,

Miralto³

et al. 2005

Mar. Ecol. Prog. Ser.

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“…Feeding experiments considering mixtures of algae with known and contrasting effects on EPR and EHS are a potential tool for discriminating between nutritional deficiency and toxic effects (Jónasdóttir et al 1998). EPR and EHS responses are measured in animals subject to carefully controlled (and non-saturating) food availability along an experimental mixing gradient between a 100% 'good' alga and a 100% 'suspect' alga.…”

Section: Abstract: Acartia Clausi · Reproduction · Food Quality · DImentioning

confidence: 99%

“…If observed responses fall below the reference line, the suspect alga is toxic, while responses above the reference line evidence complementary nutritional effects (and absence of toxicity). Further details in the interpretation of possible outcomes can be found in Jónasdóttir et al (1998). This approach has been recently employed to test toxic effects of several algal strains to Acartia tonsa (Colin & Dam 2002).…”

Section: Abstract: Acartia Clausi · Reproduction · Food Quality · DImentioning

confidence: 99%

Feeding and reproduction in a small calanoid copepod: Acartia clausi can compensate quality with quantity

Calliari¹,

Tiselius²

2005

Mar. Ecol. Prog. Ser.

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“…These algae meet the definition of having a feeding deterrent effect because they only inhibit feeding when provided solely, and they do not cause any detrimental effects on copepods when provided in a mixed diet. In contrast, because the effects of toxic algae are dose-dependent, they reduce feeding rates when presented as either a sole or mixed diet (Table 1; Nejstgaard & Solberg 1996, Jónasdóttir et al 1998, Colin & Dam 2002b.…”

Section: Introductionmentioning

confidence: 99%

Effects of the toxic dinoflagellate Alexandrium fundyense on the copepod Acartia hudsonica: a test of the mechanisms that reduce ingestion rates

Colin

Dam²

2003

Mar. Ecol. Prog. Ser.

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Reduced grazing on harmful algal bloom species has been attributed to both the feeding deterrence and toxicity of the algae. Both toxic and deterrent effects of dinoflagellates of the genus Alexandrium, which contain toxins that cause paralytic shellfish poisoning, have been reported on different copepod species. We examined how toxin-containing Alexandrium fundyense affected ingestion rates of 2 geographically distinct Acartia hudsonica (Copepoda: Calanoida) populations over short timescales. The copepod population from Great Bay, New Jersey, has never been exposed to blooms of toxic A. fundyense, whereas the population from Casco Bay, Maine, has experienced regular blooms of the highly toxic dinoflagellate for decades. Our goals were to examine the mechanisms by which toxin-containing Alexandrium reduced the ingestion rates of copepods and determine whether the mechanisms were related to the exposure history of copepod populations. Copepods were fed, for 48 h durations, sole diets of toxin-containing A. fundyense, non-toxin containing Alexandrium tamarense and the green flagellate Tetraselmis sp. (not known to have toxic effects) and different mixtures of each (70% Alexandrium/30% Tetraselmis sp., 40/60, 20/80). Changes in ingestion rates over time were determined by measuring ingestion at different time intervals (3, 6, 12, 24, 48 h) over the 48 h period using 3 h incubations. The naïve copepods from New Jersey initially ingested toxin-containing A. fundyense, in both sole and mixed diets, at high rates followed by decreases in ingestion over time. By 24 h, their total ingestion rates were near zero. The decreases in ingestion rates, which were not due to prey selection, were also accompanied by reduced respiration rates. In contrast, none of these effects were observed when the New Jersey copepods fed on non-toxic A. tamarense. Additionally, feeding rates of historically exposed copepods from Maine were not affected by the toxin-containing A. fundyense diets. These observations are consistent with the hypothesis that toxic A. fundyense physiologically incapacitated the copepods from New Jersey but not those from Maine. Such toxic effects, as opposed to deterrence effects, can have profound implications on the grazers' ability to control harmful algal blooms.

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Role of diatoms in copepod production:good, harmless or toxic?

Cited by 99 publications

References 14 publications

Colloquium on diatom-copepod interactions

Colloquium on diatom-copepod interactions

Feeding and reproduction in a small calanoid copepod: Acartia clausi can compensate quality with quantity

Effects of the toxic dinoflagellate Alexandrium fundyense on the copepod Acartia hudsonica: a test of the mechanisms that reduce ingestion rates

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