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Reference values for feeding parameters of isopods (Porcellioscaber, Isopoda, Crustacea).

Drobne D, Drobne S - Zookeys (2014)

Bottom Line: In the work presented here, the daily feeding rate of the central 50% of the control population of Porcellioscaber and a correlation between feeding rate and isopod weight were set.Values outside these ranges need additional evaluation to increase the relevance of test outcomes.We suggest using benchmark values for feeding parameters as well as the coefficient of variation (a) to identify animals with altered feeding parameters with respect to controls, and (b) to assess the data quality in each experiment.

View Article: PubMed Central - HTML - PubMed

Affiliation: University of Ljubljana, Biotechnical Faculty, Department of Biology, Vecna pot 111, SI-1000 Ljubljana, Slovenia.

ABSTRACT
The advantage of using terrestrial isopods in toxicity studies is that a battery of parameters can be tested at different levels of biological complexity. Feeding parameters for example link organism level response to potential ecological consequences but a problem with using feeding parameters in toxicity tests with terrestrial isopods is their high variability. The aim of our study was to set benchmark values for feeding parameters for isopod Porcellioscaber (Isopoda, Crustacea) in laboratory-controlled experiments. In the work presented here, the daily feeding rate of the central 50% of the control population of Porcellioscaber and a correlation between feeding rate and isopod weight were set. Values outside these ranges need additional evaluation to increase the relevance of test outcomes. We suggest using benchmark values for feeding parameters as well as the coefficient of variation (a) to identify animals with altered feeding parameters with respect to controls, and (b) to assess the data quality in each experiment.

No MeSH data available.


Related in: MedlinePlus

Porcellioscaber: Frequency distributions and interquartile range of feeding rate per day ([0.03< FR<0.07] mg/g).
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Figure 2: Porcellioscaber: Frequency distributions and interquartile range of feeding rate per day ([0.03< FR<0.07] mg/g).

Mentions: Variation of feeding rate per day (FR), judging by the coefficients of variation, is twice the variation of the isopod weight (IW) at the beginning of the experiment (Table 1). Table 1 and especially Figs 1 and 2 reveal that the observed variables of the populations are not normally distributed (Kolmogornov-Smirnov test: for both variables p<0.001). Figs 1 and 2 show a frequency distribution histogram, polygon of cumulative frequency, as well as the interquartile range (Q3-Q1) of animal weight and their feeding rate. Considering the weight of animals, there were less higher-weight animals than the mean weight (Fig. 1). Similarly, there were less animals with higher feeding rate per day then the mean feeding rate per day (Fig. 2). However, the results of the correlation analysis showed that Porcellioscaber weight and feeding rate per day were negatively correlated (Fig. 3) indicating that higher-weight animals consumed less food per day. The Pearson coefficient of correlation was significant at p<0.001 (T=-10.03).


Reference values for feeding parameters of isopods (Porcellioscaber, Isopoda, Crustacea).

Drobne D, Drobne S - Zookeys (2014)

Porcellioscaber: Frequency distributions and interquartile range of feeding rate per day ([0.03< FR<0.07] mg/g).
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4283378&req=5

Figure 2: Porcellioscaber: Frequency distributions and interquartile range of feeding rate per day ([0.03< FR<0.07] mg/g).
Mentions: Variation of feeding rate per day (FR), judging by the coefficients of variation, is twice the variation of the isopod weight (IW) at the beginning of the experiment (Table 1). Table 1 and especially Figs 1 and 2 reveal that the observed variables of the populations are not normally distributed (Kolmogornov-Smirnov test: for both variables p<0.001). Figs 1 and 2 show a frequency distribution histogram, polygon of cumulative frequency, as well as the interquartile range (Q3-Q1) of animal weight and their feeding rate. Considering the weight of animals, there were less higher-weight animals than the mean weight (Fig. 1). Similarly, there were less animals with higher feeding rate per day then the mean feeding rate per day (Fig. 2). However, the results of the correlation analysis showed that Porcellioscaber weight and feeding rate per day were negatively correlated (Fig. 3) indicating that higher-weight animals consumed less food per day. The Pearson coefficient of correlation was significant at p<0.001 (T=-10.03).

Bottom Line: In the work presented here, the daily feeding rate of the central 50% of the control population of Porcellioscaber and a correlation between feeding rate and isopod weight were set.Values outside these ranges need additional evaluation to increase the relevance of test outcomes.We suggest using benchmark values for feeding parameters as well as the coefficient of variation (a) to identify animals with altered feeding parameters with respect to controls, and (b) to assess the data quality in each experiment.

View Article: PubMed Central - HTML - PubMed

Affiliation: University of Ljubljana, Biotechnical Faculty, Department of Biology, Vecna pot 111, SI-1000 Ljubljana, Slovenia.

ABSTRACT
The advantage of using terrestrial isopods in toxicity studies is that a battery of parameters can be tested at different levels of biological complexity. Feeding parameters for example link organism level response to potential ecological consequences but a problem with using feeding parameters in toxicity tests with terrestrial isopods is their high variability. The aim of our study was to set benchmark values for feeding parameters for isopod Porcellioscaber (Isopoda, Crustacea) in laboratory-controlled experiments. In the work presented here, the daily feeding rate of the central 50% of the control population of Porcellioscaber and a correlation between feeding rate and isopod weight were set. Values outside these ranges need additional evaluation to increase the relevance of test outcomes. We suggest using benchmark values for feeding parameters as well as the coefficient of variation (a) to identify animals with altered feeding parameters with respect to controls, and (b) to assess the data quality in each experiment.

No MeSH data available.


Related in: MedlinePlus