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Energy values and energy resources of two prawns in Baltic coastal waters: the indigenous Palaemon adspersus and the non-indigenous Palaemon elegans

Janas U., Bruska O.

Oceanologia

2010

No. 52 (2)

281-297

Until recently only two palaemonid species inhabited the southern Baltic: Palaemon adspersus and Palaemonetes varians. Soon after the year 2000 a new species - Palaemon elegans - arrived and quickly established itself as a new component in the trophic web. The objects of this research were to define the energy value and energy resources of P. elegans and to compare them with the corresponding values for the native P. adspersus. These parameters will supply information about this new link in the trophic web and may help to explain the part played by the new prawn and its population in the energy flow. This work demonstrated that the energy values of both prawn species were very much the same: the average energy value of P. elegans was 16.5š2.1 J mg-1 DW (19.3š2.5 J mg-1AFDW) (N = 150), that of P. adspersus was 16.7š2.1 J mg-1 DW (19.5š 2.5 J mg-1 AFDW) (N = 71). No statistically significant differences in energy value were found between the two species with respect to sex, size or season. The results show that P. elegans is an energetically valuable food item for predators. Its energy resources in Polish brackish coastal waters can be as high as 150 kJ m-2; the highest among the palaemonid species in this habitat, they constitute a rich supply of food for other organisms.