Benthic diatom response to changing environmental conditions

Cibic, Tamara; Comici, Cinzia; Bussani, Andrea; Negro, Paola Del

doi:10.1016/j.ecss.2012.03.033

Cited by 37 publications

(24 citation statements)

References 28 publications

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“…This feature could decrease the vulnerability of microbial mats to toxic compounds (Sundbäck et al, 2007 and reference therein). Overall, microphytobenthic abundance in the port area was of the same order of magnitude as that previously estimated at a site in the middle of the Gulf of Trieste (Cibic et al, 2012a) but higher than previously reported from the coastal St. C1 (Franzo et al, 2016b). Among the investigated stations, a lower microalgal density was observed at St. 7, approximately half of that obtained at the first four stations, probably because of the greater depth (19.5 m) and lower irradiance at the bottom to support a thriving microbial phototrophic community.…”

Section: Discussion Benthic Trophic Web In the Port Areasupporting

confidence: 71%

“…Only cells containing pigments and not empty frustules were counted under a Leitz inverted light microscope (Leica Microsystems AG, Wetzlar, Germany) using a ×32 objective (×320 final magnification). Samples were counted following the protocol described by Cibic et al (2007aCibic et al ( , 2012a. At least 100 cells were counted for each replicate.…”

Section: Microphytobenthos (Mpb)mentioning

confidence: 99%

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The Port of Trieste (Northern Adriatic Sea)—A Case Study of the “Ecosystem Approach to Management”

et al. 2017

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This study is a rare example of "the ecosystem approach to management" that has been carried out for the purpose of providing practical support to decision-makers in managing a Site of National Interest (SIN) where activities such as fishing, aquaculture and swimming are restricted. Benthic ecosystem functioning was assessed to verify whether it would be possible to exclude the less contaminated part from the SIN and its legislative constraints. At five macrosites subjected to diversified industrialization and anthropization, we evaluated the structural characteristics of the sediments, both heterotrophic and phototrophic communities, and the main processes of production, transformation and consumption of organic matter at seven stations, plus a reference site. Along the north-eastern boundary of the bay, the port, shipbuilding and iron foundry areas, characterized by high levels of contaminants, low macrozoobenthic diversity, major organic contents (up to 51.1 mgC g −1 ) and higher numbers of hydrocarbon degrading bacteria (up to 5,464 MPN g dry −1 ), differed significantly (R ANOSIM = 0.463, p = 2.9%) from the other areas (stations). Oxygen consumption (−15.22 ± 1.59 mgC m −2 ) prevailed over primary production and the trophic state was net heterotrophic. In contrast, on the other side of the harbor (residential area/center bay), contamination levels were below the legal limits and both the microalgal and macrobenthic communities displayed higher biodiversity. Higher macrofaunal abundances (up to 753 ± 174.7 ind.m −2 ), primary production rates (up to 58.60 ± 8.41 mgC m −2 ) and exoenzymatic activities were estimated. nMDS and SIMPROF analyses performed on benthic communities significantly separated the most contaminated stations from the other ones. Overall, by applying this holistic approach, a better environmental situation was highlighted along the southern boundary of the bay and according to these results this part of the bay could be excluded from the SIN. However, further sampling is required along a finer sampling grid in the less contaminated side of the port in order to confirm these first results. Our work is one of the first case studies where such an ecosystem approach has been applied to a port area, in order to provide practical support to decision-makers involved in the spatial planning of harbor zones.

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Section: Discussion Benthic Trophic Web In the Port Areasupporting

confidence: 71%

Section: Microphytobenthos (Mpb)mentioning

confidence: 99%

The Port of Trieste (Northern Adriatic Sea)—A Case Study of the “Ecosystem Approach to Management”

et al. 2017

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“…5a and 7a). SDF remained the most common trophic trait category, probably due to the even and stable grain size-distribution (Cibic et al, 2012 andFranzo et al, 2016) This is in accordance with Simonini et al (2004); Occhipinti-Ambrogi et al (2005) and Faresi et al (2012), Table 2. who found deposit feeding invertebrates to be numerically dominant in sandy-mud or muddy sediments. Much of the detrital food for these invertebrates is associated with a high proportion of particles within the silt-clay range.…”

Section: Feeding Habits and Reproductive Frequencies In Relation To Fsupporting

confidence: 73%

Biodiversity, feeding habits and reproductive strategies of benthic macrofauna in a protected area of the northern Adriatic Sea: a three-year study

et al. 2017

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The macrozoobenthic community at a sublittoral station located in the Marine Protected Area of Miramare, Gulf of Trieste (Italy) was investigated monthly from June 2002 to July 2005. Community variables were studied and related to food sources (particulate, total and biopolymeric carbon contents, benthic microalgae and meiofauna). In addition, the macrofaunal response to a heatwave that occurred in summer 2003 in the area was also explored. Univariate and multivariate analyses highlighted that the macrozoobenthic community structure shifted towards the end of the study. Diversity remained fairly stable throughout the study, despite the high turnover values. From a dominance of short-lived invertebrates related to irregular fresh organic matter inputs, the community shifted toward long-lived taxa, principally related to an increase of biopolymeric C and microalgal biomass. Semelparous invertebrates seem to be less resistant to high temperatures compared to iteroparous ones. The latter proved to be capable competitors since they prevailed over the semelparous species towards the end of the study.The community exhibited a certain degree of resistance to high temperature, due to the adaptation of the macrofaunal invertebrates to this particular stress, induced by the wide natural fluctuations in temperature that occur on a seasonal basis in the Gulf of Trieste. This study highlights the importance of long datasets to assess the state and ecological processes of the macrofaunal communities.

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“…There are increasing numbers of studies documenting the ways that diatoms respond to natural environmental conditions (Serôdio et al 2006, Perkins et al 2010, Cao et al 2011, Cartaxana et al 2011, Coelho et al 2011, Cibic et al 2012, Amin et al 2015, which aid in understanding how these different species-specific responses contribute to overall spatial and temporal changes in diatom abundance in localized ecosystems. Barnett et al (2015) have shown that there is a clear difference in the photo-protective behaviours of motile and non-motile diatoms.…”

Section: Discussionmentioning

confidence: 99%

Analysis of light quality and assemblage composition on diatom motility and accumulation rate

et al. 2016

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2016): Analysis of light quality and assemblage composition on diatom motility and accumulation rate, Diatom Research,The photosensitive nature of pennate diatom movement has long been observed, with cells being able to change the direction of their movement depending on the light conditions detected at the tips of the cells. However, much of this evidence is based on observations of cells in isolated, single-species culture, thus devoid of any information regarding inter-species interactions that might occur in more complex assemblages. In this study, we tested light-sensitive diatom motility responses (cell accumulation into light spots and high irradiation-induced direction change) in the absence and presence of other species. In the light spot accumulation assay, each species showed characteristic accumulation rates with regard to light irradiance, wavelength, and presence of other species. In mixed-species assemblages, the relative abundance of different species present in the light spot could be directly modified by changes in ambient light conditions. Diatom cells were also irradiated at their leading or trailing ends in the presence or absence of other diatom species to determine the effect of assemblage composition on high irradiance photo-responsiveness. While most multi-species combinations resulted in no significant change in the high irradiance response, Stauroneis phoenicenteron cells showed a significantly slower blue light stimulated direction change response, dependent on relative cell abundance in the presence of Craticula cuspidata. Our experiments thus indicate that the rate of irradiation-stimulated direction change and accumulation ability are not only species-specific and dependent on light wavelength and intensity, but can also be modulated by the presence of other diatom species.

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Benthic diatom response to changing environmental conditions

Cited by 37 publications

References 28 publications

The Port of Trieste (Northern Adriatic Sea)—A Case Study of the “Ecosystem Approach to Management”

The Port of Trieste (Northern Adriatic Sea)—A Case Study of the “Ecosystem Approach to Management”

Biodiversity, feeding habits and reproductive strategies of benthic macrofauna in a protected area of the northern Adriatic Sea: a three-year study

Analysis of light quality and assemblage composition on diatom motility and accumulation rate

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