Relative Importance of Water and Food as Cadmium Sources to an Aquatic Insect (Chaoborus punctipennis):  Implications for Predicting Cd Bioaccumulation in Nature

1997 ◽  
Vol 31 (3) ◽  
pp. 891-895 ◽  
Author(s):  
Catherine Munger ◽  
Landis Hare
Keyword(s):  
Aquatic Insect ◽  
Relative Importance ◽  
Chaoborus Punctipennis

scholarly journals Feeding ecology of Phalloceros anisophallos (Osteichthyes: Cyprinodontiformes) from Andorinha Stream, Ilha Grande, Brazil

2010 ◽  
Vol 8 (1) ◽  
pp. 179-182 ◽  
Author(s):  
Rosana Mazzoni ◽  
Raphaella Rangel da Silva Araújo ◽  
Gardênia Carolina Tosta dos Santos ◽  
Ricardo Iglesias-Rios
Keyword(s):  
Feeding Habits ◽  
Aquatic Insect ◽  
Ontogenetic Variation ◽  
Relative Importance ◽  
Insect Larvae ◽  
Food Category ◽  
Food Items ◽  
Dry Seasons ◽  
Terrestrial Insects ◽  
Aquatic Insect Larvae

In the present work, we determined the relative importance of allochthonous and autochthonous food items as well as seasonal and ontogenetic variation in the feeding habits of Phalloceros anisophallos from córrego Andorinha, Ilha Grande. Quantitative analysis, based on alimentary index (IAi) and food volume (Vo), revealed that P. anisophallos fed on detritus, autochthonous algae (diatoms, unicellular and filamentous Chlorophyceae algae), autochthonous animals (aquatic insect larvae: Trichoptera, Chironomidae and other Diptera) and allochthonous animals (terrestrial insects: Hymenoptera). Ontogenetic variations were recorded for the consumption of each food category. Adults used a larger amount of algae and detritus, and juveniles used a higher amount of animal items. Significant differences in intestinal coefficient between adult and juvenile individuals corroborated the ontogenetic differences in feeding behavior. IAi values of each consumed food category did not vary between the rainy and dry seasons, but mean detritus Vo differed between seasons and was significantly (Anova, p<0.01) greater during the dry season.

Influence of ingestion rate and food types on cadmium accumulation by the aquatic insect Chaoborus

2000 ◽  
Vol 57 (2) ◽  
pp. 327-332 ◽  
Author(s):  
Catherine Munger ◽  
Landis Hare
Keyword(s):  
Residence Time ◽  
Ingestion Rate ◽  
Aquatic Insect ◽  
Prey Type ◽  
Cadmium Accumulation ◽  
Prey Consumption ◽  
Cd Uptake ◽  
Ingestion Rates ◽  
Chaoborus Punctipennis ◽  
Consumption Rates

We measured the influence of two food-related variables, prey type and ingestion rate, on Cd uptake by larvae of the aquatic insect Chaoborus punctipennis. Larvae collected from a low-Cd lake (0.1 nM total dissolved Cd) were held in the laboratory where they were exposed to water and to various quantities of either copepods (Diaptomus minutus) or cladocerans (Diaphanosoma birgei) from a high-Cd lake (1 nM total dissolved Cd). The Cd content of larvae exposed to the metal in water only did not increase, confirming the results of previous experiments in which food was demonstrated to be the major Cd source for C. punctipennis larvae. Prey type did not influence predator Cd content, likely because Cd concentrations in the two prey types were approximately the same (~10 µg Cd·g-1) and because Cd was assimilated with the same efficiency by the predator from the two prey types. Cadmium assimilation efficiencies were greater at low prey ingestion rates (nearly 100%) than at high prey ingestion rates (~30%), which is likely explained by a shorter residence time of food in the gut at high prey consumption rates.

The relative importance of luminal and systemic signals in the control of intestinal iron absorption

2001 ◽  
Vol 120 (5) ◽  
pp. A678-A679
Author(s):  
G ANDERSON ◽  
S WILKINS ◽  
T MURPHY ◽  
G CLEGHORN ◽  
D FRAZER
Keyword(s):  
Iron Absorption ◽  
Relative Importance ◽  
Intestinal Iron Absorption ◽  
Systemic Signals
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