Rodrigo J. Gonçalves- Dr.
- Researcher at University of Granada
Rodrigo J. Gonçalves
- Dr.
- Researcher at University of Granada
CONICET (Argentina) and Universidad de Granada (Spain)
About
43
Publications
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Introduction
Current institution
Additional affiliations
May 2012 - May 2014
June 2009 - present
Publications
Publications (43)
The present dataset served to evaluate the plankton community composition and abundance in Nuevo Gulf (42°42′ S, 64°30′ W), a World Heritage Site in Argentinian Patagonia and part of the Valdés Biosphere Reserve. It reports zooplankton abundance (>300 µm) and phytoplankton concentration (10–200 μm) during the spring and summer seasons from 2019 to...
Introduction
The impact of ocean acidification (OA) and nanoplastics (NPs) on harmful algal blooms (HAB) has emerged as a major global concern. However, the combined effects of OA and NPs on the HAB species are poorly understood.
Methods
In this study, dinoflagellate Prorocentrum donghaiense, a typical HAB species, was exposed to varying concentra...
Extreme hydrological and thermal regimes characterize the Mediterranean zone and can influence the phenology of greenhouse gas (GHG) emissions in reservoirs. Our study examined the seasonal changes in GHG emissions of a shallow, eutrophic, hardwater reservoir in Spain. We observed distinctive seasonal patterns for each gas. CH4 emissions substantia...
RheFFFO *
Working Group
*Rheology, nano/microFluidics, bioFouling
and bioFoam in the Ocean
and other natural waters
Dissolved organic matter (DOM) in the ocean represents about 662 billion tons of C, 200 times more than the living biomass. It is produced mainly by microbial primary production. The largest fraction of this DOM is old (>weeks to mon...
The effects of the toxic dinoflagellate *Alexandrium catenella* were investigated on growth, survival, and histopathology in larvae and spat of the Tehuelche scallop *Aequipecten tehuelchus* from Patagonia, Argentina. The study consisted of laboratory incubations of scallop larvae/spat with A. catenella, using environmentally realistic abundances...
Understanding how key components of plankton food webs, such as jellyfish communities, are structured by local hydrography has important management implications for fisheries and higher trophic predators within the ecosystem. Here, we report for the first time on the jellyfish abundance, richness, and diversity distribution across the Nuevo Gulf (4...
The toxicity of microplastic particles (MPs) on aquatic environments has been widely reported; however, their effects on protists are still contradictory. For example, it is unclear if cell size and cell wall have a role in shaping the response of flagellates to MPs. In this study, seven marine flagellated microalgae (six Dinoflagellates and one Ra...
Zooplankton diversity has been identified as one of the biological Essential Ocean Variables to detect temporal and spatial changes in marine biodiversity and ecosystem health. The present study evaluated the mesozooplankton community composition and abundance associated with oceanographic variables in Nuevo Gulf (NG, 42° 42’S, 64° 30’W), a World H...
In order to assess the relevance of sporadic upwelling events on primary productivity, the availability of nitrogen (N) sources and their uptake by phytoplankton were studied. Incubations of 15 N-enriched samples were performed at 3 depths in 12 stations in San Jorge Gulf (SJG, Patagonia Argentina) aboard of the R/V "Puerto Deseado" during November...
Solar ultraviolet radiation (UVR) is a stress factor in aquatic environments and may act directly or indirectly on orgnisms in the upper layers of the water column. However, UVR effects are usually species-specific and difficult to extrapolate. Here we use the HAB-forming, toxic dinoflagellate Karenia mikimotoi (which was found to be
relatively res...
This work demonstrated a 10-day batch culture experiment to test the physiology and toxicity of harmful dinoflagellate Karenia mikimotoi in response to ocean acidification (OA) under two different phosphate concentrations. Cells were previously acclimated in OA (pH=7.8 and CO2=1100 μatm) condition for about three months before testing the responses of...
The role of Patagonian wind-borne dust as a source of macronutrients over the South West Atlantic Ocean was evaluated for the first time. During spring of 2016, a series of experiments with dust were made to evaluate the dynamics of macronutrients dissolution in seawater. The results showed a differential contribution of macronutrients, depending o...
A batch culture experiment was conducted to study the interactive effects of ocean acidification (OA) and solar ultraviolet radiation (UVR, 280–400 nm) on the harmful dinoflagellate Karenia mikimotoi. Cells were incubated in 7-days trials under four treatments. Physiological (growth, pigments, UVabc) and toxicity (hemolytic activity and its toxicit...
In aquatic ecosystems, global change encompasses human-induced variations in the upper layer of the water column, where most of the carbon fixation takes place. These changes include increments of exposure to solar UV radiation, mean temperature of surface seawater, ocean acidification and variations in nutrient concentrations. These factors are we...
Land-derived dissolved and particulate matter (allochthonous matter) affect pelagic ecosystems by changing factors which include light penetration, nutrient availability, substrate concentration, and in general, biogeochemical cycles in the ocean. In a context of growing anthropogenic impact, this material may not only increase its load but also ca...
Patagonia is the major source of aeolian dust into the southern part of the Atlantic Ocean and Argentinean shelf. However, to the best of our knowledge there are no direct measurements in these regions. The objective of this study is to analyze, for the first time, the spatial distribution of dust concentration in San Jorge Gulf and adjacent shelf...
The effects of ultraviolet radiation (UVR) under future expected conditions of acidification and increase in nutrient inputs were studied on a post-bloom phytoplankton and bacterioplankton community of Patagonian coastal waters. We performed an experiment using microcosms where two environmental conditions were mimicked using a cluster approach: pr...
We reply to the comments of Paffenhöfer and Jiang (2016) who argues that remote chemical prey perception is necessary for feeding-current feeding copepods to fulfill their nutritional requirements in a dilute ocean, that remote chemical prey detection may only be observed at very low prey concentrations, and that chemical prey perception is feasibl...
The size of an individual organism is a key trait to characterize its physiology and feeding ecology. Size-based scaling laws may have a limited size range of validity or undergo a transition from one scaling exponent to another at some characteristic size. We collate and review data on size-based scaling laws for resource acquisition, mobility, se...
Feeding-current feeding copepods detect and capture prey individually, but the mechanism by which nonmotile prey is detected has been unclear. Early reports that copepods detect phytoplankton prey at distances of one body length or more led to the hypothesis that solutes leaking from the prey would be carried to the copepod by the sheared feeding c...
The size of an individual organism is a key trait to characterize its physiology and feeding ecology. Size-based scaling laws may have a limited size range of validity or undergo a transition from one scaling exponent to another at some characteristic size. We collate and review data on size-based scaling laws for resource acquisition, mobility, se...
We examined size-dependent prey detection and prey capture in free-swimming Temora longicornis using video observations, particle image velocimetry (PIV), and bottle incubations with phytoplankton prey sizes within the range 6-60 μm equivalent spherical diameter (ESD). T. longicornis generates feeding currents by oscillating its appendages at about...
Many marine species spend part of their development in upper layers of the water column, where they may be exposed to solar ultraviolet radiation (UVR). For many of these species, light is one of the key environmental clues which triggers behaviorally-mediated adjustments in vertical distribution. We incubated planktonic larvae of the crab Cyrtogra...
Significance
Plankton compromise their survival when they swim and feed because the fluid disturbances that they generate may be perceived by predators. Because the abundance and population dynamics of zooplankton in the ocean are governed by their access to food and exposure to predators, an important question is to what extent and how zooplankton...
First larval stage (Zoea I) of the crab Cyrtograpsus altimanus can obtain photoprotective
compounds (PPCs) from their mother (indirect acquisition) and also via feeding on
PPC-producers such as phytoplankton (direct acquisition). The bioaccumulation of
PPC resulted in higher survival of larvae exposed to ultraviolet radiation (UVR),
when comparing...
Ultraviolet radiation (UVR) has an overall negative effect on zooplankton. The direct effects (i.e., when the individual is exposed to UVR) include mortality due to DNA damage, and changes in feeding, reproduction and respiration. The effects can also be indirect, for example when UVR affects food quality of phytoplankton. However much of our knowl...
The size of an individual organism is a key trait to characterize its physiology and feeding ecology. Size-based scaling laws may have a limited size range of validity or undergo a transition from one scaling exponent to another at some characteristic size. We collate and review data on size-based scaling laws for resource acquisition, mobility, se...
A natural plankton population from the eutrophic lake Cacique Chiquichano, in the Argentine Patagonia, was monitored for one year to evaluate changes in photosynthetic parameters as a result of exposure to ultraviolet radiation (UVR, 280-400 nm), grazer abundance, and the taxonomic composition of the phytoplankton community. Both physical (temperat...
Ultraviolet radiation (UVR, 280–400 nm) is known to be lethal to several aquatic species; however, more subtle, 'sublethal' effects of UVR have recently received more attention. Larvae of the crab Cyrtograpsus altimanus are a transient component of the plankton community in the Atlantic northern Patagonia (Argentina) and thus they may be exposed to...
A natural plankton population from the eutrophic lake Cacique Chiquichano, in the Argentine Patagonia, was monitored for one year to evaluate changes in photosynthetic parameters as a result of exposure to ultraviolet radiation (UVR, 280-400 nm), grazer abundance, and the taxonomic composition of the phytoplankton community. Both physical (temperat...
In the last decades, both temperature and UVB (280-315 nm) radiation on the surface of the Earth increased at growing rates as a result of human activities. Many studies had evaluated the effects of temperature on aquatic ecosystems, but now the field broadens as the combination and variations of temperature and radiation gains especial importance....
In the last decades, both temperature and UVB (280-315 nm) radiation on the surface of the Earth increased at growing rates as a result of human activities. Many studies had evaluated the effects of temperature on aquatic ecosystems, but now the field broadens as the combination and variations of temperature and radiation gains especial importance....
Diurnal vertical migration in the water column and the impact of solar radiation on motility were investigated in three marine phytoplankton species: Tetraselmis suecica, Dunaliella salina and Gymnodinium chlorophorum. Cells were exposed to solar radiation either in ultraviolet radiation (UVR, 280-400 nm) transparent Plexiglas tubes (45 cm length,...
During an annual cycle, Daphnia spinulata collected from a plankton community of Patagonia was exposed outdoors to assess the impact of recently received solar radiation on motility (i.e. swimming speed and gravitaxis). Individual values of these parameters were obtained by video recordings and image analysis at different time intervals during the...
Thalli of Corallina officinalis Linnaeus were
harvested at 1-h intervals during low tide in
Barrancas Blancas (Patagonia, Argentina) on clear
days to examine diurnal changes of the UVabsorbing
mycosporine-like amino acids (MAAs)
shinorine and palythine. Corallina officinalis is
found in two growth forms in the mid and the
lower intertidal zone, whi...
Patagonia area is located in close proximity to the Antarctic ozone "hole" and thus receives enhanced ultraviolet B (UV-B) radiation (280-315 nm) in addition to the normal levels of ultraviolet A (UV-A; 315-400 nm) and photosynthetically available radiation (PAR; 400-700 nm). In marine ecosystems of Patagonia, normal ultraviolet radiation (UVR) lev...
![Fig. 5. Mean biological weighting function ([mW m-2 ]-1 ) for...](profile/Rodrigo-Goncalves-8/publication/250217909/figure/fig4/AS:669038288056326@1536522566320/Mean-biological-weighting-function-mW-m-2-1-for-phytoplankton-from-South-China-Sea_Q320.jpg)
During May 2002 we carried out studies with tropical phytoplankton assemblages from coastal waters off SE China to assess the combined effects of solar UV radiation (UVR, 280 to 400 nm) and mixing rates. Water samples were taken daily and incubated using in situ and simulated in situ conditions under 3 radiation regimes (photosynthetically active r...
The impact of ultraviolet-B radiation (UV-B, 280-315 nm) on the cladoceran Daphnia menucoensis Paggi and the copepod Metacyclops mendocinus (Wierzejski) was determined in experiments designed to evaluate the effectiveness of the photorepair mechanism and the role of UV-absorbing compounds. In both species UV-B caused significant mortality at doses...
Questions
Questions (6)
When studying the effects of global change (eg. temperature, ocean acidification, pollution, solar UV radiation, etc.) on a given community, the approach often starts by looking at the responses of a single or a few species in laboratory trials. However, it has been shown once and again that the species-specific responses in the lab can not be safely extrapolated to non-controlled, in situ conditions, where multiple factors act simultaneously.
On the other hand, if one tries to approach the question with a huge multi-factor design, it is not clear how much insight can be gained (while the higher costs are very clear!).
I assume this is also true for many other factors, so I wonder how do you guys go about this "extrapolation attempt"?
In the cases of Journals, Authors, etc. several metrics for "impact" have been criticized for not being reproducible and "open".
What about "scientific" social networks (SSN)? Nowadays there are many (RG is just one of them), but it is unclear what is the weight that these social networks put on "openness" and "transparency". Shouldn't be all criteria (e.g. to calculate impact and the general functioning) 100% clear, transparent, reproducible and sensible? Or there are other, more important criteria that makes up for a best SSN? Can you name your experience with one or more SSN? (including RG of course)
Very often (if not always), ResearchGate (RG) adds one "cover page" to uploaded PDFs of articles, therefore whenever someone gets the PDF from RG website he/she also gets the "advertisement" of RG brand name.
Do you think it's OK? why?
If it's legal, what if your university or research institute does the same? E.g. first page would be "Online repository - University of such an such"...
Barnacles, mussels, etc. attach to surfaces to settle on the bottom. Many other crustaceans also attach spermatophores on the female body surface for reproduction.
Do they all use the same kind of "glue"? I guess the first example (barnacle, mussels, etc.) is well known (due to biofouling-related research), but what about attaching spermatophores in other crustaceans? Spermatophores need to last long enough to transfer sperm, but how long? What is this glue/cement and how does it work? How long does it stick and why doesn't water dissolves it? how and where is it produced in the male body? Can you name examples?
Zooplankton may have different types of epibionts, like diatoms, green algae, ciliates, bacteria, etc.
Many of these are free-living cells during the reproductive stage, but then attach to the host turning themselves into sessile individuals, attached by a mucilaginous stalk.
I can imagine the free-living cell simply encounters it's host via direct interception, then adheres to the carapace. But how is the in between mechanism? From first contact to final attachment? is the stalk formed immediately? or it is already developed and "waiting" for a trigger? If so, what is the "trigger" and what factors influence a successful attachment?
By "non-living particles" I mean particulate inorganic matter (PIM).
I have observed PIM in guts of marine copepods, for example microparticles of suspended solids in size range of 0.5 to 50 micra.
Do you know further examples (literature or your own research) of copepods ingesting non-living particles?
What are these particles?
I assume copepods can't digest the particles, so what do they gain?
I guess this has to be more common in places where freshwater discharge is important (eg. estuaries) or where wind-driven transport of dusty sediments (eg. East of Sahara?) where there is input of high loads of land-derived materials.
