Questions related to Ecophysiology
I saw in the paper from Nguyen-Queyrens et al. (2002) that osmotic potential = ( osmotic potential at full turgor × 100) / Relative Water Content, but it does not seem correct to just to calculate osmotic potential at full turgor, as (Osmotic Potential × relative water content ) /100. The resulting values are not reliable.
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].
Hi Every one!
I'm Phd student from Cadi Ayyad university/Morocco working on Conservation Biology and Ecophysiology. I need to work with XLSTAT for my research. I worked first wih trial version that finished after 1 months!!
Could someone help me?
PhD student/ Cadi Ayyad University
I am trying to make a decision support tool to assess whether, one, two or three years after planting a tree (in my case, in an urban environment), we can consider whether it was successful or not. I am looking for criteria that can be easily used in the field. For the moment, most of the references that I have found relate to tools for rating the state of health of mature trees, generally in a forest environment.
In general, in an urban environment, what do you think are the most reliable criteria to assess the vitality of trees few years after their plantation ?
Do you know of any studies or tools aimed at meeting this need?
Thank you !
I am working on the BIOME BGC model to simulate the NPP over foothills of Himalaya. How can I do the sensitivity analysis of ecophysiological parameters over my study area?
The University of Piura is looking for young researchers, post-docs and experienced professors with a strong background in dryland ecosystems. Our goal is to put together a new team for our Research line in Ecology and productivity of dryland forest and present a joint proposal for research funds to the Peruvian government. The current call includes a two years contract to work in Peru with moving expenses included. All interested people can contact Ph.D. Pablo Salazar Zarzosa at firstname.lastname@example.org. The research line is described above
Research line: Ecology and productivity of dryland forest
To follow up the scientific projects and research papers carried out in the last three decades, The University of Piura has decided to create a new research line called “Ecology and productivity of dryland forest” focused in the flora and wildlife of the coastal North Peruvian dryland forest. Our goal is to provide an answer to the forestry division, corporations, and rural population in the context of climate change that we are living in. Our research line aims to study (1) the importance of biodiversity in the plant-plant relationships, the species spatial distribution, and forest regeneration. (2) The genetic variability and the biotechnological potential of forest ecotypes for screening processes against diseases and plagues. (3) The climatic variability associated with the El Niño phenomenon (FEN), a global climate event that creates long dry periods interrupted by extreme flood events in this region, and its change in frequency and intensity due to global warming. (4) The productive functions of the forest (wood and non-wood) as the main resource of rural life and industries.
The results of the research line seek to improve knowledge, increase productivity, and reduce vulnerability to climate change of the dryland forest, in order to improve the rural economy of 40 thousand families that rely on it. Our previous studies have focused on fruit production and processing for animal and human consumption. As well as, on forest biomass estimation, ecophysiology, and forest management for sustainable production of timber.
Currently, we are looking forward to studying the causes of Prosopis pallida pathology and the selection of genetic resistance individuals.
effect of drought stress on water use efficiency
effect of salinity stress on water use efficiency
Trees don’t grow in deserts (e.g., Sahara). Why? – The answer to this question is based on a particular combination of evolutionary history, physiology and ecology.
Do you agree with this statement?
Could you explain your point of view?
[I’m a Brazilian biologist and writer. I write about science (mainly about population biology) and would like to know the opinion of colleagues from any field of scientific knowledge (and from other countries).]
See also Habitat, environment and ecological niche (https://www.researchgate.net/post/Habitat_environment_and_ecological_niche).
I am looking for a fully functional R package for modeling Amax (maximum photosynthesis rate), VCmax (maximum rate of Rubisco carboxylation), Jmax (maximum rate of electron transport for RuBP regeneration) triose phosphate utilization (TPU) limitations and other parameters from gas exchange measurements. This can be an alternative for Photosyn Assistant (http://www.ddsci.com/photosyn.htm). Any supporting comment/answer is highly appreciated. Thank You.
I am looking to identify meetings and sessions in the field of xylem/plant water transport. If you have ever organized or attended a conference session or meeting dedicated to any aspect of this area of research please share the name of the conference. Any information is greatly appreciated.
Dear Professor Martinez-Garza,
We have installed an experiment of enrichment planting on secondary forest in Central Amazonia near to Manaus, Amazonas. We planted 1,800 seedlings of six important economic species along of a light gradient (understory, intermediate and sunlight) created by thinning treatments. We are monitoring survival, growth and ecophysiological traits since the planting (1 years-old). We intend to monitor at least for more 1 year during the initial establishment. I'd like to ask if you have any interesting to collaborate with us on this study?
With Best Wishes,
I have data on african ungulates drinking at different artficial waterpans at the peak dry time of the system (September-October). I also have data on the surface area and perimeter of these waterpans measured 4 times a year (Jan, April, July and October). My aim is not to go into much detail to describe the pressure but I need to develop a herbivore pressure index that I will use for something else.
Any help or reference?
There are plenty of estimates on salt marshes, mangroves and seagrass meadows. I am more interested in the contribution of algal forests, such as kelp or fucoides.
I was able to find estimates by:
S. V. Smith, 1981 - Marine macrophytes as a global carbon sink.
Gattuso et al., 1998 - Carbon and Carbonate Metabolism in Coastal Aquatic Ecosystems
Is there anything more current?
I also found a book chapter by Middelburg et al, 2005 that has respiration rates only..
I wanted to study the ecophysiology of J. curcas. So, I am looking for appropriate methodology of studying ecohysiology for example what sorts of climate and morphological data should be measured in the field etc.
Hello! I'm conducting a study on the carbon uptake efficiency of the algal genus Kappaphycus. More specifically, how the different environmental factors such as light exposure and salinity affect the RubisCO large-subunit gene (rcbL) which is responsible for carbon fixation. My partner and I are planning to create controlled set-ups with varying levels of light exposure and salinity as independent variables. rcbL gene expression will be measured indirectly through the monitoring of amounts of dissolved inorganic carbon within the set up. Are there any suggestions, comments, or flaws in the setup? Thank you!
I am particularly interested in the samples processing (Frozen, not frozen, squeezed or intact). Thanks in advance.
Dear All, I am looking for a classification for different "shrub types".There are several terms and definition for shrub, shrublands worldwide. Some references define shrubs for plants under 5 meter and have branches. In other side we have half shrubs, cushions like Artemisia. It would be nice to have your advice in definition for shrubs, their possible functional types.
Warm regards, Zahra
In western Algerian Sahara has a forest population of the Argan tree in the north west of Tindouf, it is extremely natural in the wild, and extends over a surface area of more than 50000 hectares, this Saharan ecosystem inhabits a remarkable biodiversity Vegetation and more than 80 taxa and is a habitat for wildlife in a desert environment.
As a result, we will seek international cooperation to target our most vulnerable heritage in the list of protected biosphere areas.
To do this, will you be able to find axes of research to develop it in scientific projects not only ecological, by uncovering the compartment of this tree within these most southern limits.
All my best regards
I am interested in marine fish (muscle vs whole body) relationships.
It would be my pleasure to have your advice for instruments and facilities in plant ecophysiology lab. We are working mainly on wild species from rangelands and forests in aridlands. Some photosynthsis, anzymes and leaf chemical physiological traits would be favorate parameters. It would be nice if you intrdouce the model of instruments as well.
Warm regards, Negar
It is widely accepted that the major factor affecting the evolutionary optimization of animal life histories is energy balance, therefore studies focus on the energy costs and benefits of adaptations, the efficiency of energy acquisition and investment, and limits to energy budgets. However, at the very least in heterotrophs, equally important seems to be the problem of maintaining stoichiometric balance.
There are two approaches in eco-evo studies that consider the matter balance as complementary to the energy balance: ecological stoichiometry and nutritional geometry. However, in my opinion, such studies are limited and after 30 years after Tilman's and Reiners' works (below), still "energocentric" point of view dominates in ecology and evolution, that carelessly underrates the need to balance the diet also in terms of the matter (including the Law of Conservation of Mass).
This is only my point of view, possibly the wrong one. I would like to ask all of you: what is your opinion?
My question was introduced as briefly as possible, don't hesitate to dig deeper and extend it!
Below I present four important studies related to the topic, just to start with.
i did pcr amplification of lipase gene. but when i tried to repeat the experiment i did not get a band. i checked the dna concentration in nanodrop it is 1000ng/microlitre. i did the reaction in the same conditions of first.
I am interested to measure PAR under canopy of shrubs. There are some high quality devices (Waltz, adc..) but i would like to have handy field instrument (not very expensive!).
Do you have any advice or experience?
Recent studies (below) showed that predators may need to optimize their diets concerning not only energy but also quality of matter eaten. However, according to common assumption, this is not intuitive (see papers below). What are your thoughts? Is it possible that predators are limited because of macro- or micro- nutrients concentrations in matter eaten? What about elements? Is it possible that for predators important are ratios other than traditional C:N:P, studied using the framework of ecological stoichiometry? What about K and Na? What about Zn:Fe ratio (these two elements compete for absorption sites)?
I am intending to use the leaf porometer to measure the stomatal conductance for my greenhouse experiment. Can anyone suggest about the accuracy and precision of data obtained from them.
why some plant like pine , snake tree and many more absorb more carbon di.oxide gas than the other.
why normal plant can not absorb high amount while they all are grew approximately in same condition like pines grew in murree where many native specie also grew but they not like wise
As pointed by Greenfield (1999) and Roulston & Cane (2000), pollen is easily digestible: special adaptations are not needed since pollen grains may be simply destroyed mechanically or through osmotic shock. However there exist a belief that pollen is hardly digestible (mostly because of chemical protection by extracellular wall). Lots of invertebrates belonging to various groups are known to supplement their diets with pollen (even predators). So is pollen easily or hardly digestible? Do you know any papers related to this issue?
We research ecophysiology of some alpine plants. We just have soil temperature data at a depth of 10 cm, monitored by data loggers at the site. The air data loggers were taken away by birds or tourists.
We would like to estimate air temperature at 1-5 cm above ground. Is it even possible according to much bigger fluctuations in air temperature?
Fish larvae (and mostly also juveniles) are too small to draw blood. Can anyone point me to literature how to assess stress levels in fish larvae not involving RNA/DNA ratios?
Can some one send me a practical positive result(s) in ecological restoration that is (are) obtained from the application of AMF. i read some article regarding some good experience in Spain (Barea et al). are there more of such examples? is the role of AMF in ecological restoration a practical one or its just a myth? many thanks in advance.
I am doing a PhD project studying the ecophysiology of some primitive insects and I am curious in comparison native and invasive species. I would like to look closer at insects community on invasive evening primroses (Oenothera biennis) in Europe and compare them with plants (Oenothera biennis) in the United States. This work will certainly yield an excellent publication and any assistance would be considered an official collaboration with me and would result in an authorship on future manuscripts.
We have plans for measuring a number crop ecophysiological properties using three different cameras mounted on a multi-rotor helicopter drone (UAV) - digital RGB, thermal, and multispectral cameras. In addition to a variety of vegetation indices, we would also like to add the capacity of estimating plant height using overlapping images and the on board GPS capabilities. I have done this sort of analysis some time ago with satellite data, but am not currently aware of the open-source options for this analysis.
People who study plant physiology have lots of experience with tree photosynthetical activity thanks to devices like Licor and Waltz.
Most of time, during the working with devices, we input some value (CO2=380, Rh=55%, PAR= 2000 etc.) to the device and we get to output value (A, E, Gs etc.).
So, in vivo and under the natural conditions and outside conditions without input of values, has anybody any experience in measuring photosynthesis parameters ( A, E, Gs, etc.) of forest trees in real-time?
Not only vultures, ostriches and many other birds that live in hot habitats also have dark feathers. Considering their extremely hot habitat and there are not many objects with such a dark color, why do they have black feathers?
Black colors can absorb sunlight better than other colors so that it can increase body temperature (like in penguins). Besides that, it's hard to camouflage since black color is easily seen in their habitats, which mostly light-brown colored.
The standard way we run graduate courses is through a journal club format. I am looking for topic ideas in a field related to Comparative Physiology taking an evolutionary, ecological or conservation physiology approach. Part of my reasoning is to have the course appealing to non-physiologically trained ecologists but also to enhance the broader training of physiologically interested graduate students.
Please post suggestions of topics or research papers.
I suppose oxygen isotope enriched water at the upper canopy can diffuse back to lower less enriched leaf by the apoplastic transport, but I don't know whether it is right or wrong.
There has been much recent interest in the role played by oxidative stress as a mediator of the life history trade-off between reproduction and survival. Field studies of birds and mammals have generally shown that oxidative stress is unchanged or increases during reproduction. However laboratory studies on mammals have tended to show completely the opposite: with damage being generally reduced (or unchanged). This has been interpreted as potentially because in the field food supplies are limited, while in the lab food is available in excess. Thus in the field the trade-off becomes exposed. However, a confounding factor is that for various reasons field studies have used blood samples to measure oxidative stress, while the lab, studies have focused on tissue samples.
We have just published 2 papers in two different species (Mongolian gerbils and Brandts voles) (Xu et al 2013; Yang et al 2013) which were both studied in captivity, but from which we sampled both blood and tissues. In both species, using protein carbonylation as the assay, we found the same effect: in blood we replicated the previous field results (greater oxidative damage in reproduction) and in the liver we replicated the previous lab results (lower oxidative damage in reproduction). Plus for several assays the damage was unchanged in both tissues.
I would be really interested in peoples thoughts about these contrasting effects, and what they mean for oxidative stress as a mediator of life history trade-offs. What is likely to be more important: damage in the liver or in the blood? And why? Is there any evidence base on which to make a decision? Should we really be looking at other tissues? And if so which? What about the best assay to use? Is protein damage important? Or is damage to lipids or DNA the thing we should really be paying attention to? And why? Is there any objective evidence on which to make a decision between different damage targets? Based on simultaneous measures of superoxide dismutase it looks like the animals in these 2 studies selectively allocated protection to different tissues: more in the liver and less in the blood? Are some tissues relatively unprotected because oxidative damage to them is less important? What do people speculate is the meaning of these different responses? Where does this leave the idea that oxidative stress is a mediator of life history trade-offs?
Xu, Y.C., Yang, D.B., Speakman, J.R. and Wang, D.H. (2013)
Oxidative stress in response to natural and experimentally elevated reproductive effort is
DOI: 10.1111/1365-2435.12168 (online 2nd Oct 2013)
Yang, D.B., Xu, Y.C., Wang, D.H. and Speakman, J.R. (2013)
Effects of reproduction on immuno-suppression and oxidative damage, and hence support or
otherwise for their roles as mechanisms underpinning life history trade-offs, are tissue and assay dependent
Journal of Experimental Biology 216:4242-50.
doi: 10.1242/jeb.092049. (online 30th Aug 2013).
(full text download via JEB web site or via research gate)
Leaf structure can affect the leaf water relations such as leaf cell size and cell wall thickness. How do we explain this correlation?
Vessel elements play a crucial role in the transport of water from roots to leaves.
Fibers are one of the components of sclerenchyma tissue, along with shorter, thick-walled sclereids and associated with the xylem and phloem tissue for support plant.
In the transverse section both are seems same. So what is accurate parameter to differentiation.
Soil carbon sequestration is perhaps one of the significant functional attributes of below-ground components in an ecosystem, but its quantitative estimation is quite problematic.
To my knowledge, fine roots are good conductors for nutrient foraging and nutrient enrichment in the soil. But in root traits, how much contribution is being made by coarse roots instead of fine roots? What kind of interrelationship takes place with soil carbon sequestration and how do we promote the rate of soil carbon sequestration?
I would be interested in providing tissues to a lab that has experience imaging or otherwise quantifying mitochondrial density in whole muscle, liver, heart, etc.
Do we have enough knowledge of ccm in different clades of algae to predict responses of groups to OA in terms of growth and production of secondary metabolites?
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.
I will only have access to birds stored on fishing boats that have been kept at -20°C. Obviously snap frozen in liquid nitrogen is ideal, but this is unlikely to happen and I will be unable to go to sea myself. So just wondering if anyone has had any experience with this and if so what biochemical data they were able to collect. Seems such a shame to not collect as much information from these birds once killed.
I am conducting a water-relations study on mangrove trees and need a method/instrument to measure the salinity of the soil/pore waters continuously. We have instruments for measuring water relations instantaneously at 10min intervals and would really like to incorporate variation of soil salinity at the same intervals.
I'm currently working on ecophysiology of tea ecosystem, in that we are trying to understand the correlation and the impact of climate in crop productivity changes using 20 years meteorological data of the study site using R statistics of VAR package. In order to assess the impact of climate to the 2050 or 2100 scenario I wanted to do Ricardian analysis. I have meteorological, yield and revenue data, kindly give your ideas/comments/ to do the analysis and ideas regarding spatial analysis.
I've developed a process-based model for methane emissions from paddy fields, which models the interaction among hydraulic, bio-geochemistry, and plant-root affecting methane production, oxidation and emissions.
In the future, I would like to implement a model able to simulate the effect of methane emission mitigation techniques on plant eco-physiology (e.g. water, temperature, nutrient stresses).
To follow the similar approach of my current model, I would prefer a process-based model instead of classical agronomic ones; i.e. something similar to the soil-plant-atmosphere continuum (SPAC) models for transpiration and photosynthesis.
Unfortunately, a similar model is strongly related to physiology, a topic out of my knowledge to develop it alone.
So, does anyone know if anything similar exists or if it is only a crazy idea? I've made a little literature research without results.
Does anybody know how to convert wind speed measured over a grass surface to the wind speed above the canopy of different aerodynamic parameters (i.e. forest canopy), so that it can be used or calculation of potential evapotranspiration by Penman-Monteith equation?