In the late eighties, significant mortality events of C. angulata) affected by a viral disease 7, 8. In France, this species was brought by local oyster farmers to replace the Portuguese oyster ( C. In the late sixties, this species, native to the NW Pacific and the Sea of Japan, has been massively introduced worldwide. Among them, the Pacific oyster, Crassostrea gigas, also represents economic value through aquaculture. Unfortunately, very few long-term datasets on marine ecosystems have been released (but see: Ocean Biodiversity Information System and European Marine Observation and Data Network ).įilter feeders play a crucial role in building reef habitats and trophic resources and are thus considered ecosystem engineers. Monitoring programs conducted over decades and across a large spatial scale provide valuable data for assessing the state and the pressures affecting the ecosystems 5, 6. It, therefore, seems crucial to disentangle short-term variations from long-term trends and human-induced alterations from “natural” evolution to determine the processes that drive such fluctuations of ecosystems functioning. However, some authors also pointed out that these variations are difficult to interpret, since the fluctuations of abiotic factors such as salinity, temperature, nutrients and oxygen concentrations vary simultaneously, often in an erratic way 4. 3 reported rapid changes in species communities and abrupt fluctuations of productivity of estuarine–coastal ecosystems in different contexts. At the land-sea interface, estuarine and coastal ecosystems are particularly affected by climate change and more direct anthropogenic pressures such as coastal engineering (habitat alteration) and pollution 2. In the last two decades, a consensus emerged that human activities had become the main drivers of ecosystems functioning 1. It can also be valuable for epidemiologists because mortality data traces the emergence and spread of a massive epizootic. This improved database is expected to be used by ecologists interested in the evolution of life-cycle indicators of a marine species under the influence of climate change. For 13 locations, we modeled growth and mortality of spat (less than one-year-old individuals) and half-grown oysters (between one and two-year-old individuals) as a function of time to cope with changes in data acquisition frequency, and produced standardized annual growth and cumulative mortality indicators to improve data usability. Here, we describe data collection for almost 30 years, cleaning and processing. The archive, although publicly available, has been challenging to use due to changes in protocols and little information on metadata. This network monitors the growth and mortality of the Pacific oyster Crassostrea gigas along French coasts since 1993. We used a compiled data set from a monitoring network of oyster production coordinated by IFREMER (the French Research Institute for the Exploitation of the Sea).
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