These reproductive events, however, take place on limited spatial scales and close to the water surface. The example of nereids demonstrates the potential impact of such interference in a single event on the population dynamics of the species and also that only few compounds were responsible for the observed effects. This text then discusses the significance of maintaining estuarine environment quality if fisheries are to continue.
The results suggest that effects of oil-derived pollutants are structure dependent as only aromatic compounds caused any effects in the n-alkane range from C11 to C17, only a selection of a total of 51 possible isomeric C5-alkylated benzenes were found to unambiguously induce release of gametes in both species and the active isomers were not the same for both species. The chemoreception of Homarus americanus and Pachygrapsus crassipes is effectively disrupted by oil derived pollutants at similar concentrations as those reported for nereids Atema, ; Takahashi and Kittredge,
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In northern Europe both species reproduce from June to end of September; the precise time of swarming is co-ordinated by lunar periodicity and occurs around new moon in Nereis succinea Hardege et al. The authors discuss the possibility that such interference could result in a limited ability to find food or mates or to detect and escape from predators.
A single already swarming specimen was introduced into the dish and the sample deposited into its swimming path with a pipette or microlitre syringe Hamilton.
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Test animals reacted to these with release of gametes but also showed toxic effects, paralysis and repellent behaviour. Advanced Search Abstract Nereis succinea and Platynereis dumerilii Annelida, Polychaeta are broadcast spawners and reproduce semelparously.
The macroalgal approaches also constitute important contributions related to structure and function, intra-population variation, storage and transport of chemical defenses.