The annual temperature cycle in shelf seas

Shell chemistry of the Boreal Campanian bivalve Rastellum diluvianum (Linnaeus, 1767) reveals temperature seasonality, growth rates and life cycle of an extinct Cretaceous oyster

“…However, comparison with data on Cretaceous seasonality between 15°N and 35°N paleolatitude (Steuber et al, 2005) shows that while MAT at 50°N was significantly lower than those at lower latitudes (18°C vs. 25-30°C respectively), the seasonal temperature range during cooler periods in the Late Cretaceous was remarkably similar between latitudes (10-15°C in subtropical latitudes vs. ±14°C in this study). This observation contrasts with the present-day situation in Northern Africa and Europe, in which seasonal temperature ranges are generally much higher in mid-to highlatitudes (30-50°N) than in lower latitudes (10-30°N; Prandle and Lane, 1995;Rayner, 2003;Locarnini et al, 2013;NOAA, 2018). Such seasonalities reconstructed from bivalve shells are not consistent with model predictions of an ice-free Cretaceous world, since those models predict both smaller seasonal temperature ranges and a shallower paleotemperature gradient (Barrera and Johnson, 1999;Hay and Floegel, 2012;Upchurch et al, 2015).…”

Shell chemistry of the Boreal Campanian bivalve Rastellum diluvianum (Linnaeus, 1767) reveals temperature seasonality, growth rates and life cycle of an extinct Cretaceous oyster

“…However, comparison with data on Cretaceous seasonality between 15°N and 35°N paleolatitude (Steuber et al, 2005) shows that while MAT at 50°N was significantly lower than those at lower latitudes (18°C vs. 25-30°C respectively), the seasonal temperature range during cooler periods in the Late Cretaceous was remarkably similar between latitudes (10-15°C in subtropical latitudes vs. ±14°C in this study). This observation contrasts with the present-day situation in Northern Africa and Europe, in which seasonal temperature ranges are generally much higher in mid-to highlatitudes (30-50°N) than in lower latitudes (10-30°N; Prandle and Lane, 1995;Rayner, 2003;Locarnini et al, 2013;NOAA, 2018). Such seasonalities reconstructed from bivalve shells are not consistent with model predictions of an ice-free Cretaceous world, since those models predict both smaller seasonal temperature ranges and a shallower paleotemperature gradient (Barrera and Johnson, 1999;Hay and Floegel, 2012;Upchurch et al, 2015).…”

Evaluating the influences of temperature, primary production, and evolutionary history on bivalve growth rates

“…Although the link between metabolic rate and shell growth rate is indirect (Lewis and Cerrato 1997; Pouvreau et al 2006; Bourlès et al 2009), as is the link between shell growth rate and growth coefficient (see discussion in “Methods”), the well-documented and theoretically robust temperature dependence of metabolism probably explains our results (Gillooly et al 2001). Seafloor temperature tends to correspond more closely with SST during the winter than during the summer (Prandle and Lane 1995; Austin et al 2006), which may explain why minimum temperature is the strongest predictor in our analyses. Moss et al (2016) found that the standard deviation of all k observations within a latitudinal bin decreased from the equator to the poles; along the same line, our results offer some support for the idea that higher temperatures are associated with not just higher k but also a greater spread of k .…”

Shell chemistry of the boreal Campanian bivalve Rastellum diluvianum (Linnaeus, 1767) reveals temperature seasonality, growth rates and life cycle of an extinct Cretaceous oyster

“…However, comparison with data on Cretaceous temperature seasonality between 15 and 35 • N paleolatitude (Steuber et al, 2005) shows that while MAT at 50 • N was significantly lower than at lower latitudes (19 and 25-30 • C, respectively), the seasonal temperature range during cooler periods in the Late Cretaceous was remarkably similar between latitudes (10-15 • C in subtropical latitudes vs. ±14 • C in this study). This observation contrasts with the presentday situation in northern Africa and Europe, in which sea-sonal temperature ranges are generally much higher at midlatitudes to high latitudes (30-50 • N) than at lower latitudes (10-30 • N; Prandle and Lane, 1995;Rayner, 2003;Locarnini et al, 2013;NOAA, 2020). Our SST reconstructions also show that Late Cretaceous latitudinal temperature gradients and mid-to high-latitude seasonality were larger than previously assumed based on climate model results (Barrera and Johnson, 1999;Hay and Floegel, 2012;Upchurch et al, 2015).…”

Shell chemistry of the Boreal Campanian bivalve Rastellum diluvianum (Linnaeus, 1767) reveals temperature seasonality, growth rates and life cycle of an extinct Cretaceous oyster

“…However, comparison with data on Cretaceous seasonality between 15°N and 35°N paleolatitude (Steuber et al, 2005) shows that while MAT at 50°N was significantly lower than those at lower latitudes (18°C vs. 25-30°C respectively), the seasonal temperature range during cooler periods in the Late Cretaceous was remarkably similar between latitudes (10-15°C in subtropical latitudes vs. ±14°C in this study). This observation contrasts with the present-day situation in Northern Africa and Europe, in which seasonal temperature ranges are generally much higher in mid-to highlatitudes (30-50°N) than in lower latitudes (10-30°N; Prandle and Lane, 1995;Rayner, 2003;Locarnini et al, 2013;NOAA, 2018). Such seasonalities reconstructed from bivalve shells are not consistent with model predictions of an ice-free Cretaceous world, since those models predict both smaller seasonal temperature ranges and a shallower paleotemperature gradient (Barrera and Johnson, 1999;Hay and Floegel, 2012;Upchurch et al, 2015).…”

Evaluating the influences of temperature, primary production, and evolutionary history on bivalve growth rates

“…Although the link between metabolic rate and shell growth rate is indirect (Lewis and Cerrato 1997; Pouvreau et al 2006; Bourlès et al 2009), as is the link between shell growth rate and growth coefficient (see discussion in “Methods”), the well-documented and theoretically robust temperature dependence of metabolism probably explains our results (Gillooly et al 2001). Seafloor temperature tends to correspond more closely with SST during the winter than during the summer (Prandle and Lane 1995; Austin et al 2006), which may explain why minimum temperature is the strongest predictor in our analyses. Moss et al (2016) found that the standard deviation of all k observations within a latitudinal bin decreased from the equator to the poles; along the same line, our results offer some support for the idea that higher temperatures are associated with not just higher k but also a greater spread of k .…”

Shell chemistry of the boreal Campanian bivalve Rastellum diluvianum (Linnaeus, 1767) reveals temperature seasonality, growth rates and life cycle of an extinct Cretaceous oyster

“…However, comparison with data on Cretaceous temperature seasonality between 15 and 35 • N paleolatitude (Steuber et al, 2005) shows that while MAT at 50 • N was significantly lower than at lower latitudes (19 and 25-30 • C, respectively), the seasonal temperature range during cooler periods in the Late Cretaceous was remarkably similar between latitudes (10-15 • C in subtropical latitudes vs. ±14 • C in this study). This observation contrasts with the presentday situation in northern Africa and Europe, in which sea-sonal temperature ranges are generally much higher at midlatitudes to high latitudes (30-50 • N) than at lower latitudes (10-30 • N; Prandle and Lane, 1995;Rayner, 2003;Locarnini et al, 2013;NOAA, 2020). Our SST reconstructions also show that Late Cretaceous latitudinal temperature gradients and mid-to high-latitude seasonality were larger than previously assumed based on climate model results (Barrera and Johnson, 1999;Hay and Floegel, 2012;Upchurch et al, 2015).…”

Shell chemistry of the Boreal Campanian bivalve Rastellum diluvianum (Linnaeus, 1767) reveals temperature seasonality, growth rates and life cycle of an extinct Cretaceous oyster

“…However, comparison with data on Cretaceous seasonality between 15°N and 35°N paleolatitude (Steuber et al, 2005) shows that while MAT at 50°N was significantly lower than those at lower latitudes (18°C vs. 25-30°C respectively), the seasonal temperature range during cooler periods in the Late Cretaceous was remarkably similar between latitudes (10-15°C in subtropical latitudes vs. ±14°C in this study). This observation contrasts with the present-day situation in Northern Africa and Europe, in which seasonal temperature ranges are generally much higher in mid-to highlatitudes (30-50°N) than in lower latitudes (10-30°N; Prandle and Lane, 1995;Rayner, 2003;Locarnini et al, 2013;NOAA, 2018). Such seasonalities reconstructed from bivalve shells are not consistent with model predictions of an ice-free Cretaceous world, since those models predict both smaller seasonal temperature ranges and a shallower paleotemperature gradient (Barrera and Johnson, 1999;Hay and Floegel, 2012;Upchurch et al, 2015).…”

Evaluating the influences of temperature, primary production, and evolutionary history on bivalve growth rates

“…Although the link between metabolic rate and shell growth rate is indirect (Lewis and Cerrato 1997; Pouvreau et al 2006; Bourlès et al 2009), as is the link between shell growth rate and growth coefficient (see discussion in “Methods”), the well-documented and theoretically robust temperature dependence of metabolism probably explains our results (Gillooly et al 2001). Seafloor temperature tends to correspond more closely with SST during the winter than during the summer (Prandle and Lane 1995; Austin et al 2006), which may explain why minimum temperature is the strongest predictor in our analyses. Moss et al (2016) found that the standard deviation of all k observations within a latitudinal bin decreased from the equator to the poles; along the same line, our results offer some support for the idea that higher temperatures are associated with not just higher k but also a greater spread of k .…”

Shell chemistry of the boreal Campanian bivalve Rastellum diluvianum (Linnaeus, 1767) reveals temperature seasonality, growth rates and life cycle of an extinct Cretaceous oyster

“…However, comparison with data on Cretaceous temperature seasonality between 15 and 35 • N paleolatitude (Steuber et al, 2005) shows that while MAT at 50 • N was significantly lower than at lower latitudes (19 and 25-30 • C, respectively), the seasonal temperature range during cooler periods in the Late Cretaceous was remarkably similar between latitudes (10-15 • C in subtropical latitudes vs. ±14 • C in this study). This observation contrasts with the presentday situation in northern Africa and Europe, in which sea-sonal temperature ranges are generally much higher at midlatitudes to high latitudes (30-50 • N) than at lower latitudes (10-30 • N; Prandle and Lane, 1995;Rayner, 2003;Locarnini et al, 2013;NOAA, 2020). Our SST reconstructions also show that Late Cretaceous latitudinal temperature gradients and mid-to high-latitude seasonality were larger than previously assumed based on climate model results (Barrera and Johnson, 1999;Hay and Floegel, 2012;Upchurch et al, 2015).…”