Extreme climatic events, implications for projections of species distributions and ecosystem structure (by Diego Fdez-Sevilla PhD)

Extreme climatic events, implications for projections of species distributions and ecosystem structure (by Diego Fdez-Sevilla PhD)

By Diego Fdez-Sevilla PhD. CV english and español. Resume. Interdisciplinary Skills applied in the line of research presented.- Index for all analyses published. – Shares and Feedback at LinkedIn

Registered in pdf at ResearchGate DOI: 10.13140/RG.2.2.19446.04161


Heat acclimation—the subtle hormonal and metabolic changes that make it easier for the body to cope with heat—is a gradual process that occurs over a few weeks of exposure to progressively higher temperatures.

For nearly two weeks, many areas in India faced temperatures that were 5.5 degrees Celsius (10 degrees Fahrenheit) above normal. May is generally the hottest month in India, but even by local standards May 2015 was unusual. By June 4, the extreme weather had claimed the lives of more than 2,500 people, according to news reports.

It has been pointed out the deathly effect that abrupt onset of heat waves can have over human populations (e.g. in India) when people have little time to acclimate to the heat.

Similarly, heat waves and abrupt changes in temperature exert a huge amount of pressure on all other biological systems, affecting species distributions and ecosystem structure. The alteration of habitats is directly linked with potential changes in their synergistic feedbacks. Species of plants covering an area have an interconnection with atmospheric humidity and adiabatic processes throughout evapotranspiration. Different species of plants have different evapotranspiration rates and changing their location will change the stability of regional feedbacks. Also the radicular configuration of plants differ between species and with it, their interconnectivity with the retention of water in the soil, also related with evaporation processes and atmospheric circulation at tropospheric level. The type of plants covering an area is also linked with the properties of albedo as part of the microclimate of the region which would be altered by having a change or loss in plant species.

These are just some examples of how abrupt changes in temperature may affect synergistic feedbacks between species distributions, ecosystem structure and atmospheric stratification and circulation.

This post complements others published previously in this blog trying to highlight the increasing relevance of understanding connecting patterns between non-biotic and biotic systems involved in atmospheric developments. The weakening of the Polar Jet Stream (as consequence of seen reduced the thermal contrast between subtropical and polar masses of air) would potentially allow “out of season” exchanges of masses of air between both sides, triggering abrupt changes of temperature wherever they move.

The weakening of the Polar Jet Stream can be linked with the changing chemical composition of the atmosphere due to increasing CO2 concentrations. The level of graduality in the transition between seasons can be affected due to the burst of Atmospheric events. If these are strong enough to alter the stability of biological systems they well might also affect the synergistic feedbacks existent between biological productivity and the thermodynamic atmospheric behaviour.

These synergistic feedbacks seem to not be of much part of the research available in the literature. Most studies are addressing the survival of species and mechanisms of adaptation against changes in climate or atmospheric behaviour. And yet, I believe that the stability of an ecosystem, biotic and nonbiotic parts altogether, has to be considered as the result of receiving and absorbing perturbations by all sides, atmosphere, biotope and ecotope. When a region losses the capacity to absorb perturbations and regenerate itself to its previous state, the whole balance between land cover and atmospheric behaviour above it will change. And thus, the climatic parameters defining the region. Only by changing the species of vegetation covering land surfaces the albedo will change, inducing changes in convective circulation as well as the chemistry of the soil and its structure.

From regional to a global change only takes to have enough regional changes to coalescence.

Some literature published addressing changes in species distributions and ecosystem structure.

Thermal tolerance and the global redistribution of animals

(2012. Jennifer M. Sunday, Amanda E. Bates & Nicholas K. Dulvy)

The redistribution of life on Earth has emerged as one of the most significant biological responses to anthropogenic climate warming1, 2, 3. Despite being one of the most long-standing puzzles in ecology4, we still have little understanding of how temperature sets geographic range boundaries5. Here we show that marine and terrestrial ectotherms differ in the degree to which they fill their potential latitudinal ranges, as predicted from their thermal tolerance limits. Marine ectotherms more fully occupy the extent of latitudes tolerable within their thermal tolerance limits, and are consequently predicted to expand at their poleward range boundaries and contract at their equatorward boundaries with climate warming. In contrast, terrestrial ectotherms are excluded from the warmest regions of their latitudinal range; thus, the equatorward, or ‘trailing’ range boundaries, may not shift consistently towards the poles with climate warming. Using global observations of climate-induced range shifts, we test this prediction and show that in the ocean, shifts at both range boundaries have been equally responsive, whereas on land, equatorward range boundaries have lagged in response to climate warming. These results indicate that marine species’ ranges conform more closely to their limits of thermal tolerance, and thus range shifts will be more predictable and coherent. However, on land, warmer range boundaries are not at equilibrium with heat tolerance. Understanding the relative contribution of factors other than temperature in controlling equatorward range limits is critical for predicting distribution changes, with implications for population and community viability.

A globally coherent fingerprint of climate change impacts across natural systems

Camille Parmesan1 & Gary Yohe2

Causal attribution of recent biological trends to climate change is complicated because non-climatic influences dominate local, short-term biological changes. Any underlying signal from climate change is likely to be revealed by analyses that seek systematic trends across diverse species and geographic regions; however, debates within the Intergovernmental Panel on Climate Change (IPCC) reveal several definitions of a ‘systematic trend’. Here, we explore these differences, apply diverse analyses to more than 1,700 species, and show that recent biological trends match climate change predictions. Global meta-analyses documented significant range shifts averaging 6.1 km per decade towards the poles (or metres per decade upward), and significant mean advancement of spring events by 2.3 days per decade. We define a diagnostic fingerprint of temporal and spatial ‘sign-switching’ responses uniquely predicted by twentieth century climate trends. Among appropriate long-term/large-scale/multi-species data sets, this diagnostic fingerprint was found for 279 species. This suite of analyses generates ‘very high confidence’ that climate change is already affecting living systems.

Extreme climatic event drives range contraction of a habitat-forming species.



Species distributions have shifted in response to global warming in all major ecosystems on the Earth. Despite cogent evidence for these changes, the underlying mechanisms are poorly understood and currently imply gradual shifts. Yet there is an increasing appreciation of the role of discrete events in driving ecological change. We show how a marine heat wave (HW) eliminated a prominent habitat-forming seaweed, Scytothalia dorycarpa, at its warm distribution limit, causing a range contraction of approximately 100 km (approx. 5% of its global distribution). Seawater temperatures during the HW exceeded the seaweed’s physiological threshold and caused extirpation of marginal populations, which are unlikely to recover owing to life-history traits and oceanographic processes. Scytothalia dorycarpa is an important canopy-forming seaweed in temperate Australia, and loss of the species at its range edge has caused structural changes at the community level and is likely to have ecosystem-level implications. We show that extreme warming events, which are increasing in magnitude and frequency, can force step-wise changes in species distributions in marine ecosystems. As such, return times of these events have major implications for projections of species distributions and ecosystem structure, which have typically been based on gradual warming trends.

From introduction:

Global warming has caused many species to shift their geographical range towards cooler environments [1,2]. As such, the poleward redistribution of species is emerging as a significant biological response to increased global temperatures in both marine and terrestrial ecosystems [35]. While range shifts have been detected across decadal time-scales, by comparing historical and contemporary data, there have been few direct observations of the processes that drive population change at the range edge. Moreover, there have been far fewer observations of climate-driven range contractions compared with expansions, and, as such, the mechanisms and velocities of change at the ‘trailing edge’ are poorly understood [6]. These issues have major implications for understanding and predicting the dynamics of range shifts [2].

The current paradigm implies that species ranges change continuously with warming [7], yet this perception cannot be reconciled with recent observations of no [8,9] or abrupt [10,11] ecological change in response to gradual warming. Alternatively, range shifts are incremental, being driven by discrete extreme events. In nature, it is likely that species exhibit a combination of both gradual and sudden, and extensive distribution shifts in response to climate when physiological thresholds are exceeded. The distinction between gradual and abrupt range dynamics has important implications for climate change mitigation because of the implied threshold dynamics and the difficulties of predicting (as well as reversing) any undesirable changes. Event-driven changes also prevent accurate estimation of the velocity of range contractions, leading to errors in projections of future impacts. Extreme climatic events are increasing in frequency and intensity as a consequence of anthropogenic climate change [12,13]. These events are likely to have major implications for natural resources, and understanding and predicting biological responses to ‘events’, rather than to ‘trends’, have become increasingly important [14]. Evidence for species range shifts in terrestrial ecosystems, in response to both gradual warming and discrete warming events, far exceeds evidence from marine ecosystems [15,16]. As the velocity of warming in the sea is similar to that on land [17] and most coastal ecosystems have warmed significantly in recent decades [18], it is very likely that the poleward redistribution of marine biota has been severely under-reported.

Why is it important what happens to our habitats?

In October 2014 I used the following thought to introduce my posture on climate: “The introduction of the biotic component in our planet is responsible for the active transformation suffered in the chemistry of our oceans and atmosphere and, therefore, our climate.”

Recently, a new publication has stated that “The connection between oxygen levels and climate has never been considered. It turns out that it’s an important factor over geological timescales“. I cannot believe that this phrase can represent the state of knowledge in climatic research.

Sometimes I have been writing on issues of actual relevance applying intentionally fundamental knowledge and principles. My intention is to highlight the lack of perspective from the point of view of integrating “old” settled science into the “new” uncertainty uncovered with the incorporation of new techniques and data in the state of knowledge.

Following the words from George Orwell “Sometimes the first duty of intelligent men is the restatement of the obvious.”

In a fast paced environment full of new gadgets, instruments and enormous quantities of data, we face the challenge of not forgetting what we already knew, and the applications that all this knowledge have in today’s questions.

What we consider trivial, one day, it might actually become the hidden answer everybody was looking for.

The chemistry of the Atmosphere and our Oceans is directly linked with our climate and atmospheric behaviour. The obvious is to understand that such chemistry is the result of millenniums combining forces between thermodynamic and biochemical processes. But, can the obvious get forgotten and ignored so easily? Or is it its triviality?

It is because of biological systems that Oxygen increased in the Oceans. That changed the chemistry of the oceans and reduced acidification. It is water soluble and functions as an oxidator: O2 + 2 H2O + 4 e -> 4 OH

 It is because of biological systems dry land became covered by plants, reducing albedo and thermal contrasts as well as retaining water in the soil.

Those processes are consequence of photosynthetic reactions, being the only force in our planet moving against the natural tendency for our system to increase its entropy. The human species have met the system in an equilibrium state between both forces. That has allowed life to evolve in a single genetic configuration we call DNA. When the opposing force to entropy weakens all we get is entropy, thermodynamics and uncertainty.

I believe that we are looking too much at how climatic events might harm our ecosystems, when at the same time, we should be looking at how much, harming our ecosystems, might loosen the mechanisms controlling our climate.


Variations in atmospheric oxygen levels shaped Earth’s climate through the ages

Oxygen currently comprises about 21 percent of Earth’s atmosphere by volume but has varied between 10 percent and 35 percent over the past 541 million years.

In periods when oxygen levels declined, the resulting drop in atmospheric density led to increased surface evaporation, which in turn led to precipitation increases and warmer temperatures, according to University of Michigan paleoclimatologist Christopher Poulsen.

“The connection between oxygen levels and climate has never been considered. It turns out that it’s an important factor over geological timescales,” said Poulsen, a professor in the Department of Earth and Environmental Sciences. While not as critical to climate as levels of heat-trapping carbon dioxide gas, oxygen plays a key role, he said.

“Oxygen concentration can help explain features in the paleoclimate record not accounted for by variations in carbon dioxide levels, and it must considered if we are to fully understand past climates,” Poulsen said. “However, variations in oxygen levels are not an important factor in present-day climate change.”


Constraints to nitrogen acquisition of terrestrial plants under elevated CO2


A key part of the uncertainty in terrestrial feedbacks on climate change is related to how and to what extent nitrogen (N) availability constrains the stimulation of terrestrial productivity by elevated CO2 (eCO2), and whether or not this constraint will become stronger over time. We explored the ecosystem-scale relationship between responses of plant productivity and N acquisition to eCO2 in free-air CO2 enrichment (FACE) experiments in grassland, cropland and forest ecosystems and found that: (i) in all three ecosystem types, this relationship was positive, linear and strong (r2 = 0.68), but exhibited a negative intercept such that plant N acquisition was decreased by 10% when eCO2 caused neutral or modest changes in productivity. As the ecosystems were markedly N limited, plants with minimal productivity responses to eCO2 likely acquired less N than ambient CO2-grown counterparts because access was decreased, and not because demand was lower. (ii) Plant N concentration was lower under eCO2, and this decrease was independent of the presence or magnitude of eCO2-induced productivity enhancement, refuting the long-held hypothesis that this effect results from growth dilution. (iii) Effects of eCO2 on productivity and N acquisition did not diminish over time, while the typical eCO2-induced decrease in plant N concentration did. Our results suggest that, at the decennial timescale covered by FACE studies, N limitation of eCO2-induced terrestrial productivity enhancement is associated with negative effects of eCO2 on plant N acquisition rather than with growth dilution of plant N or processes leading to progressive N limitation.

—- xxx —-

(This post is part of a more complex piece of independent research. I don´t have founding, political agenda or publishing revenues from visits. Any scientist working in disciplines related with the topics that I treat in my blog knows how to judge the contribution that my work could potentially add to the state of knowledge. Since I am in transition looking for a position in research, if you are one of those scientists, by just acknowledging any value you might see from my contribution, would not only make justice to my effort as independent researcher, but ultimately, it will help me to enhance my chances to find a position with resources to further develop my work.

I believe that the hypothesis that I have presented in previous posts in this blog (here,here and here) could help to understand present and possible future scenarios in atmospheric circulation. However, this is an assessment based on observation which needs to be validated throughout open discussion and data gathering. So please feel free to incorporate your thoughts and comments in a constructive manner.

If you feel like sharing this post I would appreciate to have a reference about the place or platform, by private or public message, in order for me to have the opportunity to join the debate and be aware of the repercussion which might generate d.fdezsevilla(at)gmail.com)

About Diego Fdez-Sevilla, PhD.

Data policy The products processed by "Diego Fdez-Sevilla PhD" are made available to the public for educational and/or scientific purposes, without any fee on the condition that you credit "Diego Fdez-Sevilla PhD" as the source. Copyright notice: © Diego Fdez-Sevilla PhD 2013-2019 orcid: orcid.org/0000-0001-8685-0206 and the link to its source at diegofdezsevilla.wordpress or permanent DOI found at Reearchgate. Should you write any scientific publication on the results of research activities that use Diego Fdez-Sevilla PhD products as input, you shall acknowledge the Diego Fdez-Sevilla's PhD Project in the text of the publication and provide an electronic copy of the publication (d.fdezsevilla@gmail.com). If you wish to use the Diego Fdez-Sevilla PhD products in advertising or in any commercial promotion, you shall acknowledge the Diego Fdez-Sevilla PhD Project and you must submit the layout to Diego Fdez-Sevilla PhD for approval beforehand (d.fdezsevilla@gmail.com). The work here presented has no economic or institutional support. Please consider to make a donation to support the means for making sustainable the energy, time and resources required. Also any sponsorship or mentoring interested would be welcome. Intellectual Property This article is licensed under a Creative Commons Attribution 4.0 International License. By Diego Fdez-Sevilla, PhD. More guidance on citing this web as a source can be found at NASA webpage: http://solarsystem.nasa.gov/bibliography/citations#! For those publications missing at the ResearchGate profile vinculated with this project DOIs can be generated on demand by request at email: d.fdezsevilla(at)gmail.com. **Author´s profile: Born in 1974. Bachelor in General Biology, Masters degree "Licenciado" in Environmental Sciences (2001, Spain). PhD in Aerobiology (2007, UK). Lived, acquired training and worked in Spain, UK, Germany and Poland. I have shared the outcome from my work previous to 2013 as scientific speaker in events held in those countries as well as in Switzerland and Finland. After 12 years performing research and working in institutions linked with environmental research and management, in 2013 I found myself in a period of transition searching for a new position or funding to support my own line of research. In the current competitive scenario, in order to demonstrate my capacities instead of just moving my cv waiting for my next opportunity to arrive, I decided to invest my energy and time in opening my own line of research sharing it in this blog. In March 2017 the budget reserved for this project has ended and its weekly basis time frame discontinued until new forms of economic and/or institutional support are incorporated into the project. The value of the data and the original nature of the research presented in this platform and at LinkedIn has proved to be worthy of consideration by the scientific community as well as for publication in scientific journals. However, without a position as member of an institution, it becomes very challenging to be published. I hope that this handicap do not overshadow the value of my achievements and that the Intellectual Property Rights generated with the license of attribution attached are respected and considered by the scientist involved in similar lines of research. **Any comment and feedback aimed to be constructive is welcome as well as any approach exploring professional opportunities.** In this blog I publish pieces of research focused on addressing relevant environmental questions. Furthermore, I try to break the barrier that academic publications very often offer isolating scientific findings from the general public. In that way I address those topics which I am familiar with, thanks to my training in environmental research, making them available throughout my posts. (see "Framework and Timeline" for a complete index). At this moment, 2019, I am living in Spain with no affiliation attachments. Free to relocate geographically worldwide. If you feel that I could be a contribution to your institution, team and projects, don´t hesitate in contact me at d.fdezsevilla (at) gmail.com or consult my profile at LinkedIn, ResearchGate and Academia.edu. Also, I'd appreciate information about any opportunity that you might know and believe it could match with my aptitudes. The conclusions and ideas expressed in each post as part of my own creativity are part of my Intellectual Portfolio and are protected by Intellectual Property Laws. Licensed under Creative Commons Attribution-NonCommercial conditions. In citing my work from this website, be sure to include the date of access and DOIs found at the Framework and Timeline page and ResearchGate. (c)Diego Fdez-Sevilla, PhD, 2018. Filling in or/and Finding Out the gaps around. Publication accessed 20YY-MM-DD at https://diegofdezsevilla.wordpress.com/ ***
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93 Responses to Extreme climatic events, implications for projections of species distributions and ecosystem structure (by Diego Fdez-Sevilla PhD)

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  12. More info in this subject:

    Climate Impacts on Ecosystems from EPA

    Global Climate Change and Extreme Weather Events: Understanding the Contributions to Infectious Disease Emergence: Workshop Summary.
    Institute of Medicine (US) Forum on Microbial Threats. Washington (DC): National Academies Press (US); 2008.


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