Shifts in the timing of spawning in sole linked to warming sea temperatures

• Published in: Journal of sea research Vol. 75; pp. 69 - 76
• Main Authors: Fincham, Jennifer I., Rijnsdorp, Adriaan D., Engelhard, Georg H.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier B.V 01.01.2013; Elsevier
• Subjects: Animal and plant ecology; Animal, plant and microbial ecology; Biological and medical sciences; Climate Change; Climatology. Bioclimatology. Climate change; cod gadus-morhua; Earth, ocean, space; English Channel; environmental factors; Exact sciences and technology; External geophysics; Fish; fish populations; fisheries; Fundamental and applied biological sciences. Psychology; growth; Marine; maturation reaction norms; maturity ogives; Meteorology; North Sea; Phenology; plaice pleuronectes-platessa; population dynamics; Populations; Raw materials; Sea water ecosystems; Sole; Solea solea; spawning; Spawning Season; spring; surface water temperature; Synecology; Time measurements; time series analysis; Winter; Winter Temperature; English Channel; Irish Sea; North Sea; ANE, North Sea; ANE, Europe, English Channel; ANE, Irish Sea; ANE, British Isles, Bristol Channel; Sole; Climate Change; Winter Temperature; Spawning Season; Phenology; Dynamical climatology; Marine environment; Warming; Climate change; Breeding season; Temperature; Spawning; Timing
• ISSN: 1385-1101; 1873-1414
• DOI: 10.1016/j.seares.2012.07.004

Phenotypic traits such as peak spawning time may vary within and differ between populations in relation to environmental factors, such as temperature. Sole (Solea solea) is a valuable, commercially exploited species that spawns in late winter or spring. The date of peak spawning was estimated for each year for seven stocks from monthly fish samples collected from commercial fisheries since 1970. Four out of seven stocks showed a significant long-term trend towards earlier spawning (Irish Sea, east-central North Sea, southern North Sea, eastern English Channel) at a rate of 1.5weeks per decade. The other three stocks (Bristol Channel, western English Channel and western-central North Sea) failed to show a relationship, but the available time series were limited for these stocks (<10years). Sea surface temperature during winter significantly affected the date of peak spawning, although the effect differed between stocks. The implications of the effect of winter temperature on the timing of spawning for the population dynamics are discussed.