Jahangir Vajedsamiei- Dr. rer. nat
- Postdoc at Leibniz Institute for Baltic Sea Research
Jahangir Vajedsamiei
- Dr. rer. nat
- Postdoc at Leibniz Institute for Baltic Sea Research
My work aims to quantify carbon dynamics in bivalve beds.
About
28
Publications
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Introduction
I am a researcher at the Leibniz Institute for Baltic Sea Research, Warnemünde (IOW). Currently, I work on the STATUS project, where my research focuses on evaluating carbon dynamics in coastal ecosystems, particularly within mussel beds. My work aims to quantify the role of bivalves in carbon sequestration, contributing to blue carbon solutions that address climate change.
Current institution
Additional affiliations
October 2011 - June 2015
Education
September 2008 - September 2010
September 2001 - June 2005
Publications
Publications (28)
There is a shortage of knowledge about taxonomy and distribution of coral reef communities in the Persian Gulf. One of
the main steps in the conservation and evaluation of such an environment is to locate and identify the communities and
their inhabited fauna and flora. In the present study scleractinian corals were collected from depths of 3 to 9...
This research characterizes the temporal and spatial variability of the seawater carbonate chemistry on the near-shore waters of the northern Persian Gulf and Makran Sea. In general, normalized total alkalinity (nAT) showed a westward decrease along the coasts of Makran Sea and the Persian Gulf. Intertidal seawater was always supersaturated in term...
Climate change imposes unusual long‐term trends in environmental conditions, plus some tremendous shifts in short‐term environmental variability, exerting additional stress on marine ecosystems. This paper describes an empirical method that aims to improve our understanding of the performance of benthic filter feeders experiencing changes in enviro...
Ongoing climate warming demands a better understanding of whether or how the ectotherms that evolved in response to fluctuating stress regimes may acquire increased heat tolerance. Using blue mussels, Mytilus spp., a globally important and well-studied species, we provide empirical evidence supporting that (i) extremely warm (future) summer conditi...
Predicting the implications of ongoing ocean climate warming demands a better understanding of how short‐term thermal variability impacts marine ectotherms, particularly at beyond‐optimal average conditions during summer heatwaves.
Using a globally important model species, the blue mussel Mytilus, in a 5‐week‐long experiment, we (a) assessed growth...
Mussels from the genus Mytilus, key inhabitants of the benthos, are important for the aquaculture industry and one of the most sustainable sources of animal protein available. Species within the Mytilus edulis complex ( M. edulis, M. galloprovincialis and M. trossulus ) are commonly found in temperate regions globally and can easily hybridise whene...
As climate change intensifies heatwaves, quantifying associated mortality within ectothermic populations is crucial for effective conservation. Thermal tolerance landscape (TTL) models are useful predictive tools that assume exponentially decreasing survival durations in individuals with increasing temperatures. This assumption has been validated t...
The mussel Mytilus edulis, a host to various trematode species, experiences performance decrements due to these infections. Yet, the impact magnitude and potential interactions with environmental stressors remain largely unexplored. This study scrutinizes the effect of Renicola roscovita infections on mussel filtration and respiration. We first ass...
Global warming may alter the dynamics of infectious diseases by affecting important steps in the transmission of pathogens and parasites. In trematode parasites, the emergence of cercarial stages from their hosts is temperature-dependent, being highest around a thermal optimum. If environmental temperatures exceed this optimum as a consequence of g...
Climate change increases the frequency and intensifies the magnitude and duration of extreme events in the sea, particularly so in coastal habitats. However, the interplay of multiple extremes and the consequences for species and ecosystems remain unknown. We experimentally tested the impacts of summer heatwaves of differing intensities and duratio...
Global warming may alter the dynamics of infectious diseases by affecting important steps in the transmission of pathogens and parasites. In trematode parasites, the emergence of cercarial stages from their hosts is temperature-dependent, being highest around a thermal optimum. If environmental temperatures exceed this optimum as a consequence of g...
The relevance of considering environmental variability for understanding and predicting biological responses to environmental changes has resulted in a recent surge in variability‐focused ecological research. However, integration of findings that emerge across studies and identification of remaining knowledge gaps in aquatic ecosystems remain criti...
The blue mussel (Mytilus species complex) is an important ecosystem engineer, and salinity can be a major abiotic driver of mussel functioning in coastal ecosystems. However, little is known about the interactive effects of abiotic drivers and trematode infection. This study investigated the combined effects of salinity and Himasthla elongata and R...
As a foundation species in shallow-water ecosystems, the mussel Mytilus edulis is often exposed to heat stress, negatively affecting its performance. Trematode parasites may exacerbate those effects. This study explores mussel metabolic responses to Renicola roscovita infections under mild and transient heat exposures. First, we investigated the re...
As a foundation species in shallow-water ecosystems, the mussel Mytilus edulis exposed to abiotic and biotic stressors. In particular, heat stress can have detrimental effects on mussel performance and biotic interactions with parasites may exacerbate those effects. This study explores the metabolic responses of mussels to infections with the trema...
To predict global warming impacts on parasitism, we should describe the thermal tolerance of all players in host–parasite systems. Complex life-cycle parasites such as trematodes are of particular interest since they can drive complex ecological changes. This study evaluates the net response to temperature of the infective larval stage of Himasthla...
Global change impacts marine organisms and communities mainly through ocean warming, acidification, deoxygenation, and changes in nutrient inputs and water circulation. To assess the ecological impacts of global change, the effects of multiple interacting environmental drivers, including their fluctuations, should be tested at different levels of b...
Ongoing changes in ocean climate (e.g., warming trends) are accompanied by increases in frequency and intensity of extreme weather events (e.g., heatwaves), particularly in shallow-water habitats. Traditionally, empirical studies intending to project the ecological impacts of environmental variability have focused on species or community responses...
There is a strong interest in understanding how coral calcification varies with changing environmental conditions, especially given the projected changes in temperature and aragonite saturation due to climate change. This study explores in situ variation in calcification rates of Acropora downingi in the northeastern Persian Gulf relative to season...
With ongoing climate change, coral susceptibility to thermal stress constitutes a central concern in reefconservation. In the Persian Gulf, coral reefs are confronted with a high seasonal variability in water temperature, and both hot and cold extremes have been associated with episodes of coral bleaching and mortality. Using physiological performa...
With ongoing climate change, coral susceptibility to thermal stress constitutes a central concern in reef conservation. In the Persian Gulf, coral reefs are confronted with the most extreme temperatures. Over the last decades, both annual hot and cold peak periods in this region have been associated with episodes of coral bleaching and mortality. U...
With ongoing climate change, coral susceptibility to thermal stress constitutes a central concern in reef conservation. In the Persian Gulf, coral reefs are confronted with the most extreme temperatures. Over the last decades, both annual hot and cold peak periods in this region have been associated with episodes of coral bleaching and mortality. U...
Thermal anomaly is among factors initiating coral bleaching and mortalities and threatening coral reefs worldwide. Therefore, susceptibility of corals to thermal stress is a central concern in reef conservation. In this study, we evaluated underwater temperature during 2012-13 and bleaching status of corals during summer 2012 in Hengam Island locat...
To study the distribution of subtidal benthic invertebrates in Chabahar Bay and surrounding waters, samplings were undertaken on April and December 2012. Nine stations were sampled from Pozm to Ramin by using Van Veen grab (250 cm2). Samples mostly belonged to 7 classes (Bivalvia, Gastropoda, Scaphopoda, Malacostraca, Polychaeta, Echinoidea and Oph...
Questions
Questions (3)
I would highly appreciate it if my fellow ecologists (biologists) provide their opinion on the thoughts below [esp., shortly tell us which path may be more effective, if they know another way, if there is a recent breakthrough toward this goal].
To consider the effects of Acclimation and Directional Selection on populations' thermal sensitivity in the (mechanistic or phenomenological) modeling of ecological impacts of temperature variability (and climate change), we can follow two general paths:
(1) To produce enough empirical data to define simplistic indices of warm adaptation capacity (based on exposure temperature and duration) for at least some keystone species [a simple e.g., ARR; Morley et al., 2019]. Such indices can only be applied to models' outputs.
(2) To understand the GENERAL mechanisms (principal functional components) defining the heat sensitivity of various taxa [e.g., OCLTT, Pörtner, 2010], define how the component (quantitatively) relates to the capacity for rapid warm adaptation [no Ref.], and set (adaptive) feedback loops in existing models [a simple e.g., Kingsolver et al., 2016].
In some coral reefs, high tides usually occure at mid-day and can induce decrease of underwater temperature and light intensity significantly. It is a fact that duration or number of subsequent days with small high tides at warmest time of the year could differ inter-annually.So it seems probable that thermal stress would be higher in years with more subsequent days with small high tides (more days with constant warm water) at their warmest period.
In our recent study, we found that the dark respiration of an acroporid coral could be very low in naturally experienced cold water extremes of the Persian Gulf at winter. In this regard, I want to discuss the issue with you.
