A decade of sampling in the Bay of Biscay: What are the zooplankton time series telling us?

Valdés, Luis; López‐Urrutia, Ángel; Cabal, J.; Alvarez-Ossorio, M. T.; Bode, Antonio; Miranda, A.; Cabanas, José Manuel Oro; Huskin, I.; Anadón, Ricardo; Álvarez-Marqués, Florentina; Llope, Marcos; Rodríguez, Nieves

doi:10.1016/j.pocean.2007.04.016

Cited by 76 publications

(54 citation statements)

References 33 publications

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“…The phytoplankton colour index indicates a clear increase in primary productivity in the areas that encompass offshore waters in the Bay of Biscay (Edwards et al 2009). This increase in primary productivity does not appear to have been transferred to the higher trophic levels, as CPR data suggest that zooplankton concentration is stable or has declined, as also observed in coastal time series (Valdés et al 2007). …”

Section: Impacts On the Pelagic Environmentmentioning

confidence: 69%

“…The results from coastal time series differ locally. Off Gijon, a decrease in primary production has been observed over the last 10 yr (Valdés et al 2007, Llope et al 2007, whereas an increase has been observed off La Coruña, around the area of the Galician upwelling (Valdés et al 2007). In turn, regarding long-term trends in chl a, Bode et al (2009) did not identify any evidence for significant change at 2 locations, in Galicia and the central Cantabrian Sea, over the past 10 to 20 yr.…”

Section: Impacts On the Pelagic Environmentmentioning

confidence: 99%

See 1 more Smart Citation

Climate change impacts on coastal and pelagic environments in the southeastern Bay of Biscay

Chust¹,

Borja²,

Caballero³

et al. 2011

Clim. Res.

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The impacts of global climate change on the Basque coast and the pelagic systems within the southeastern Bay of Biscay are reviewed. Climate projections under greenhouse gas emission scenarios indicate that this area will experience changes in climate throughout the 21st century, including warming of surface air (especially heat wave episodes), intensification of extreme daily rainfall (10%), warming of the upper 100 m of the ocean layer (1.5 to 2.05°C), and sea level rise (SLR; 29 to 49 cm). Observations made in the bay throughout the 20th century for air temperature and mean sea level are in agreement with these projections. Trends in ocean-climatic historical observations within the area, including sea temperature, precipitation, upwelling/downwelling, turbulence and wave climate, are also reviewed. The main impacts on the coast are expected to be from SLR, especially in low-lying areas (mostly urbanised) within estuaries. Sandy beaches are also expected to undergo significant mean shoreline retreats of between 25 and 40% of their width. As the sea level rises, the natural migration of saltmarshes and intertidal seagrasses landward will be constrained, in most cases, by existing anthropogenic fixed boundaries. Empirical relationships between the distribution and dynamics of the long-term biological measures (plankton, primary production, benthos, and fisheries) on the one hand, and ocean-climatic variability on the other, indicate that pelagic and coastal water ecosystems will be affected by ocean warming, increased stratification, shifts in anomaly patterns and streamflow regimes. The largest uncertainties are associated with the lack of downscaled projections within the bay on ocean circulation, ocean-meteorological indices, wave climate and ocean acidification.

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Section: Impacts On the Pelagic Environmentmentioning

confidence: 69%

Section: Impacts On the Pelagic Environmentmentioning

confidence: 99%

Climate change impacts on coastal and pelagic environments in the southeastern Bay of Biscay

Chust¹,

Borja²,

Caballero³

et al. 2011

Clim. Res.

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“…Poulet et al (1996) reviewed zooplankton size information from locations rather irregularly distributed along the Bay of Biscay; Valdés et al (2007) and from long time series of local transects in the north of Spain or in front of the Gironde estuary, respectively; Nogueira et al (2004) and Sourisseau and Carlotti (2006) from biomass and size structure of the mesozooplankton measured by an optical plankton counter from a single season and 2 years, respectively; or from a time series of biomass and size-spectrum maps over the southern French shelf of the bay over a decade in spring (Irigoien et al, 2009).…”

Section: P Vandromme Et Al: Biscay Zooplankton Size Spectramentioning

confidence: 99%

Springtime zooplankton size structure over the continental shelf of the Bay of Biscay

Vandromme

Nogueira²,

Huret

et al. 2014

Ocean Sci.

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Abstract. Linking lower and higher trophic levels requires special focus on the essential role played by mid-trophic levels, i.e., the zooplankton. One of the most relevant pieces of information regarding zooplankton in terms of flux of energy lies in its size structure. In this study, an extensive data set of size measurements is presented, covering parts of the western European continental shelf and slope, from the Galician coast to the Ushant front, during the springs from 2005 to 2012. Zooplankton size spectra were estimated using measurements carried out in situ with the Laser Optical Plankton Counter (LOPC) and with an image analysis of WP2 net samples (200 µm mesh size) performed following the ZooScan methodology. The LOPC counts and sizes particles within 100-2000 µm of spherical equivalent diameter (ESD), whereas the WP2/ZooScan allows for counting, sizing and identification of zooplankton from ∼ 400 µm ESD. The difference between the LOPC (all particles) and the WP2/ZooScan (zooplankton only) was assumed to provide the size distribution of non-living particles, whose descriptors were related to a set of explanatory variables (including physical, biological and geographic descriptors). A statistical correction based on these explanatory variables was further applied to the LOPC size distribution in order to remove the non-living particles part, and therefore estimate the size distribution of zooplankton. This extensive data set provides relevant information about the zooplankton size distribution variability, productivity and trophic transfer efficiency in the pelagic ecosystem of the Bay of Biscay at a regional and interannual scale.

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“…T. stylifera is now regularly present in moderately high abundance in the Bay of Biscay and coastal waters north to the British Isles during fall and early winter, perhaps due to advection from the south in the Warm Winter Poleward Current and increasing water temperate and stratification (e.g. Villate et al 2004, Lindley & Daykin 2005, Valdés et al 2007, and references therein). This northward shift has increased the biogeographic overlap of the congeneric species pair, and may have increased heterospecific mate encounters between them.…”

Section: Introductionmentioning

confidence: 99%

Heterospecific mating and species recognition in the planktonic marine copepods Temora stylifera and T. longicornis

Goetze¹,

Kiørboe²

2008

Mar. Ecol. Prog. Ser.

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Many planktonic copepods use diffusible pheromone or hydromechanical signals to remotely detect the presence of potential mates. To determine whether these mating signals also play a role in species recognition and mate choice, we observed and video recorded (3D) mate-finding and pursuit behaviors in heterospecific and conspecific mating crosses in a pair of congeneric, partially sympatric species (Temora stylifera and T. longicornis) in the laboratory. The species appear to have asymmetrical pre-mating isolation, with T. longicornis males readily pursuing T. stylifera females to mate contact and capture, but with little mate-finding activity observed in the reverse cross. Males of T. longicornis pursuing heterospecific females executed a number of behaviors known to facilitate successful pheromone trail following and mate capture in conspecific mating, including accelerated swimming in a 'signal-scanning' mode to recover a lost pheromone trail, reversal of the tracking direction in cases when the male initiated tracking in the incorrect direction, and accelerated swimming speeds when in the presence of a pheromone signal but prior to locating the trail. Detailed analyses of mate-tracking behavior in T. longicornis male × T. stylifera female crosses gave no indication that males were aware they were pursuing heterospecific females prior to mate contact, indicating that diffusible pheromone and hydromechanical signals are not used, either singly or in combination, for species recognition in this mating pair. Heterospecific mating attempts among sympatric, congeneric copepods may commonly proceed to mate capture, and incur fitness costs to either or both mating partners. KEY WORDS: Mate choice · Behavioral isolation · Mating asymmetry · Diffusible pheromone · Hydromechanical signalsResale or republication not permitted without written consent of the publisher

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A decade of sampling in the Bay of Biscay: What are the zooplankton time series telling us?

Cited by 76 publications

References 33 publications

Climate change impacts on coastal and pelagic environments in the southeastern Bay of Biscay

Climate change impacts on coastal and pelagic environments in the southeastern Bay of Biscay

Springtime zooplankton size structure over the continental shelf of the Bay of Biscay

Heterospecific mating and species recognition in the planktonic marine copepods Temora stylifera and T. longicornis

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