Phytoplankton communities in the northwestern Adriatic Sea: Interdecadal variability over a 30-years period (1988–2016) and relationships with meteoclimatic drivers

Totti, Cecilia; Romagnoli, Tiziana; Accoroni, Stefano; Coluccelli, Alessandro; Pellegrini, Maurizio; Campanelli, Alessandra; Grilli, Federica; Marini, Mauro

doi:10.1016/j.jmarsys.2019.01.007

Cited by 57 publications

(59 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, in oligotrophic northern coastal Adriatic sea, the reduction of freshwater flow was identified as a driver of both change in phytoplanktonic composition, and reduction of total abundance during the 1986-2077 period (Aubry et al, 2012;Cabrini et al, 2012). Recently in the same region, a re-increase of the Pô river outflow observed during the 2007-2016 was followed by a reduction of coccolithophorid and by an increase in phytoflagellate biomass (Totti et al, 2019).…”

Section: Impacts On Diatom Communitymentioning

confidence: 97%

Decadal shifts of coastal microphytoplankton communities in a semi-enclosed bay of NW Mediterranean Sea subjected to multiple stresses

Serranito

Jamet

Rossi

et al. 2019

Estuarine, Coastal and Shelf Science

View full text Add to dashboard Cite

Long-term evolution of microphytoplankton communities remains poorly studied in anthropized coastal zones submitted to multiple stressors. Here, we investigate decadal (2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016)(2017) microphytoplankton community changes, focusing on abundance and biovolume of major taxa related to both local abiotic conditions (rainfall rate, temperature and salinity) and regional convection events (wintering deep mixing) in the highly urbanized and semi-enclosed Toulon Bay (NW Mediterranean Sea). Results showed that persistent variations in local rainfall regime were followed by major changes in microphytoplankton community composition. Wet period (P 2 ) (increase of wintering precipitations observed between late 2008 and early 2015) was associated to an increase of large heterotrophic dinoflagellates and disappearance of dominant diatom taxa, while dry periods (2005-2008 (P 1 ) and 2015-2017 (P 3 )) promoted diatoms, microflagellates and small mixotrophic/heterotrophic dinoflagellates including potentially toxic species. Concomitance between intense deep mixing events, reported in open Ligurian Basin (particularly during winters 2005 and 2006) and higher values in the total microphytoplankton abundance and in spring diatom abundance regardless of rainfall conditions, presents this meso-scale process as the main fertilization mechanism in Toulon Bay. Although no change was detected in the chlorophyll a concentration during the 2006-2017 period, its trend was negatively correlated to the total microphytoplankton abundance. This negative relation as well as a change of size in dinoflagellates suggested a shift in the primary producer nature, from large autotrophic cells (diatoms and microflagellates) to smaller ones, driven by a runoff intensification. Finally, different communities composition were observed during both dry periods (i.e. diatoms-dominated and autotrophic microflagellate-dominated communities during P 1 and P 3 , respectively), suggesting another environmental driver of change for phytoplankton communities of this coastal ecosystem.

show abstract

Section: Impacts On Diatom Communitymentioning

confidence: 97%

Decadal shifts of coastal microphytoplankton communities in a semi-enclosed bay of NW Mediterranean Sea subjected to multiple stresses

Serranito

Jamet

Rossi

et al. 2019

Estuarine, Coastal and Shelf Science

View full text Add to dashboard Cite

show abstract

“…In our study, diatoms and nanoflagellates co-occurred, while diatoms dominated in abundance and contribution at all investigated depths. This is also typical of other Adriatic areas, where diatoms often dominate the phytoplankton maxima [30][31][32][33]. Turbidity in estuaries could regulate phytoplankton growth and also the community composition, with small diatoms better adapted to the turbid conditions caused by river inflow [1].…”

Section: Phytoplankton Communitymentioning

confidence: 98%

Phytoplankton Dynamics in the Middle Adriatic Estuary, with a Focus on the Potentially Toxic Genus Pseudo-nitzschia

Arapov

Bužančić

Skejić

et al. 2020

JMSE

View full text Add to dashboard Cite

The Krka River estuary is a karstic, permanently stratified estuary due to the strong freshwater inflow. It is a special environment in which to study the phytoplankton community, especially because this area is an important aquaculture site. Among other potentially toxic phytoplankton species, the diatom genus Pseudo-nitzschia occurs frequently and is a potential source of domoic acid (DA), causing shellfish toxicity and human intoxication. The main objective was to examine the dynamics of the phytoplankton community and, in particular, the genus Pseudo-nitzschia in the upper part of the Krka estuary, through monthly sampling over two years. The phytoplankton community was analysed using light microscopy and scanning electron microscopy to determine the diversity of Pseudo-nitzschia species and characterise the environmental parameters associated with a high abundance of Pseudo-nitzschia species. Seven Pseudo-nitzschia species were identified in the investigation, with higher frequencies and abundances in the less variable layer, at a 7 m depth. Blooms of Pseudo-nitzschia were noted in the late summer/early autumn, dominated by P. delicatissima/arenysensis. Winter assemblages were characterised by P. pseudodelicatissima/cuspidata, P. calliantha, and P. subfraudulenta, and were associated with domoic acid occurrence in shellfish.

show abstract

“…Even a study carried out at the coastal station of the LTER (Long Term Ecosystem Research) Senigallia-Susak transect, ca. 40 km to the north of our study area, showed significantly increased phytoplankton abundance and biomass and inorganic nutrient concentrations in the period 2007-2016 compared with 1988-2002 due to increased Po River flows, which were observed since 2007; moreover, abnormally abundant rainfall combined with greater freshwater inputs in 2007-2016, especially in winter, explained the decreasing salinity trend recorded in the same years (Totti et al, 2019). Water acidification also affects clam shell growth (Fabry et al, 2008) and reduces shell thickness (Bressan et al, 2014).…”

Section: Discussionmentioning

confidence: 63%

“…Water acidification also affects clam shell growth (Fabry et al, 2008) and reduces shell thickness (Bressan et al, 2014). Even though increasing water acidification has been documented in north Adriatic dense deep waters (Luchetta et al, 2010), the change is too limited to reduce the saturation state of carbonates to an extent that would significantly affect clam calcification processes (Totti et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Age and Growth of Striped Venus Clam Chamelea gallina (Linnaeus, 1758) in the Mid-Western Adriatic Sea: A Comparison of Three Laboratory Techniques

et al. 2020

View full text Add to dashboard Cite

Age and growth studies provide critical data for clam fishery management. Three aging techniques, thin sections and acetate peel replicas-which involve shell sectioningand surface growth rings were used to estimate the age and growth of Chamelea gallina populations in the mid-western Adriatic Sea. Their results were compared to identify the most reliable and least time-consuming approach. There were no significant differences between the two shell sectioning techniques (χ 2 = 4.66, df = 3, p = 0.198), which were described by the same von Bertalanffy (VBF) growth curve parameters (L 8 = 43.9, k = 0.26, t 0 = −0.84), whereas significantly different L 8 and k values were found between the two shell sectioning techniques and surface growth rings (L 8 : χ 2 = 13.62, df = 1, p < 0.001; k: χ 2 = 9.18, df = 1, p < 0.002; these statistics refer to the comparison between acetate peels and surface growth rings). The latter approach proved unreliable and error-prone, as it underestimated age and overestimated the growth rate (L 8 = 26.4, k = 1.91, t 0 = −0.11). Although the thin sections and acetate peel techniques both provide reliable age and growth estimates, the former approach was less time-consuming. Our analyses demonstrated that shell growth is slower in the cold season and in older specimens and that it has slowed down over the past few decades.

show abstract

Phytoplankton communities in the northwestern Adriatic Sea: Interdecadal variability over a 30-years period (1988–2016) and relationships with meteoclimatic drivers

Cited by 57 publications

References 74 publications

Decadal shifts of coastal microphytoplankton communities in a semi-enclosed bay of NW Mediterranean Sea subjected to multiple stresses

Decadal shifts of coastal microphytoplankton communities in a semi-enclosed bay of NW Mediterranean Sea subjected to multiple stresses

Phytoplankton Dynamics in the Middle Adriatic Estuary, with a Focus on the Potentially Toxic Genus Pseudo-nitzschia

Age and Growth of Striped Venus Clam Chamelea gallina (Linnaeus, 1758) in the Mid-Western Adriatic Sea: A Comparison of Three Laboratory Techniques

Contact Info

Product

Resources

About