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Biodiversity of tactics used by three Gobiida (Pisces; Teleostei): Pomatoschistus minutus (Pallas, 1770), P.microps (Kroyer, 1838), Gobius niger (Linnaus, 1758), to survive in a Maditerranean Lagoon environment

100%

Bouchereau J.-L.

vol. 26

issue 2-3

153-170

Each population studied employs a personal strategy to ensure its successful occupation of and reproduction in a very harsh Mediterranean ecosystem, the Mauguio lagoon (Gulf of Lions). P. minutus undertakes relocation to search for quality biotopes and to ensure success in the various stages of its life cycle by genesic migration (for reproduction) to the sea of adults for spawning, and by postlarval trophic immigration within the lagoon. However, P. microps, more euryvalent, is completely sedentary. Although G. niger has adaptive capacities potentially similar to those of P. microps, and makes a considerable reproductive effort, this species is subject to relative demographic failure, mainly owing to the scarcity of nesting areas both in the lagoon and at sea. The spatial and trophic co-exploitation of the lagoon is facilitated for these three populations by the migrational behaviour of P. minutus, the different static and dynamic characteristics of each species studied, and the evolution of the seasonal vegetation in this environment.

Comparison of life history strategies of three Gobiida Pomatoschistus minutis (Pallas, 1770), P.microps (Kroyer, 1838), Gobius niger (Linnaus, 1758), (Pisces Teleostei) over their geographical range

88%

Bouchereau J.-L.

vol. 26

issue 2-3

171-190

The relationship between population structure and different environmental conditions were considered for three goby species in different geographical areas, particularly in the Mediterranean, Gulf of Lions and the Adriatic, and the cold temperate Atlantic, situated north of the English Channel. In the three species the life cycles in the Mediterranean favoured by the local hydroclimate are 'contracted' (growth is rapid and reproductive effort important) whereas, in the Atlantic, life cycles are 'protracted' with growth and reproduction equal to or less intense. Whatever the geographic position of the species, reproductive success remains very similar.

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2 Oceanological Studies

2 1997

2 Bouchereau J.-L.

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Biodiversity of tactics used by three Gobiida (Pisces; Teleostei): Pomatoschistus minutus (Pallas, 1770), P.microps (Kroyer, 1838), Gobius niger (Linnaus, 1758), to survive in a Maditerranean Lagoon environment

Comparison of life history strategies of three Gobiida Pomatoschistus minutis (Pallas, 1770), P.microps (Kroyer, 1838), Gobius niger (Linnaus, 1758), (Pisces Teleostei) over their geographical range