Importance of fungi in the diet of Gammarus pulex and Asellus aquaticus I: feeding strategies

Oecologia ◽  
1993 ◽  
Vol 93 (1) ◽  
pp. 139-144 ◽  
Author(s):  
M. A. S. Graça ◽  
L. Maltby ◽  
P. Calow
Keyword(s):  
Gammarus Pulex ◽  
Feeding Strategies ◽  
Asellus Aquaticus

scholarly journals Dietary Preference ofGammarus pulexandAsellus aquaticusduring a Laboratory Breeding Programme for Ecotoxicological Studies

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
M. C. Bloor
Keyword(s):  
Food Preference ◽  
Alnus Glutinosa ◽  
Gammarus Pulex ◽  
The Other ◽  
Ex Situ ◽  
Breeding Programme ◽  
Asellus Aquaticus ◽  
Leaf Material ◽  
Dietary Preference ◽  
Laboratory Breeding

An investigation was undertaken to establish ifGammarus pulexandAsellus aquaticuspreferred a diet of unconditioned, artificially or naturally conditioned alder leaves (Alnus glutinosa). Standardised, 24 hourex situfeeding assays were undertaken with both species to determine their food preference. The results showed thatA. aquaticusate more leaf material compared toG. pulex(Z 23.909,P0.001) when exposed to all three test variables. Also, bothG. pulexandA. aquaticusdemonstrated a preference for naturally conditioned leaves compared to the other two variables, with unconditioned leaves proving the least popular food option for both macroinvertebrates (Z 18.803, ). However, both species ate varying amounts of all the leaf treatments (Z 136.399, ). Subsequently, the author outlined a feeding methodology for natural alder leaf conditioning that could be used during a laboratory breeding programme.

Nitrogenous Excretion of Amphipods and Isopods

1950 ◽  
Vol 27 (2) ◽  
pp. 210-225
Author(s):  
ELISABETH I. B. DRESEL ◽  
VIVIEN MOYLE
Keyword(s):  
Uric Acid ◽  
Nitrogen Metabolism ◽  
Fresh Water ◽  
Gammarus Pulex ◽  
Nitrogen Excretion ◽  
Physiological Adaptation ◽  
Asellus Aquaticus ◽  
Terrestrial Species ◽  
Water Species ◽  
Eleven Species

1. The nitrogen excretion of eleven species of amphipods and isopods, including marine, fresh-water and terrestrial forms, has been studied. 2. All species are essentially ammonotelic, since more than 50% of the total soluble N.P.N. of the excreta was present in the form of ammonia throughout. 3. The level of nitrogen excretion is appreciably lower in the terrestrial species than in any of the others, indicating that, in this group, adaptation to terrestrial conditions has been attended by a general suppression of nitrogen metabolism rather than by a transformation of ammonia to other, less toxic products. 4. Some 5-10% of the total soluble N.P.N. was present as urea in the case of the fresh-water amphipod, Gammarus pulex, and as uric acid in the terrestrial isopods as well as the fresh-water isopod, Asellus aquaticus. It is suggested that these minor excretory components might originate from purines as a result of the loss of one or more of the uricolytic enzymes. 5. In association with the excretion of uric acid some retention of this insoluble compound usually occurs, and it was found that among the terrestrial species the amount so stored parallels the degree of morphological and physiological adaptation to terrestrial conditions. The greatest accumulation of uric acid was, however, observed in the fresh-water species, A. aquaticus, and although such a storage cannot necessarily be taken as evidence for a partially uricogenic metabolism, this possibility must be borne in mind.

Importance of fungi in the diet of Gammarus pulex and Asellus aquaticus

Oecologia ◽  
1993 ◽  
Vol 96 (3) ◽  
pp. 304-309 ◽  
Author(s):  
M. A. S. Graça ◽  
L. Maltby ◽  
P. Calow
Keyword(s):  
Gammarus Pulex ◽  
Asellus Aquaticus
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