quantifying ecological functions

Here is an interesting article on quantifying ecological functions. The main application appears to be wetland mitigation but the theory seems more general and could maybe be adapted to a variety of ecosystem restorations or creations.

Landscape consequences of aggregation rules for functional equivalence in compensatory mitigation programs

Mitigation and offset programs designed to compensate for ecosystem function losses due to development must balance losses from affected ecosystems and gains in restored ecosystems. Aggregation rules applied to ecosystem functions to assess site equivalence are based on implicit assumptions about the substitutability of functions among sites and can profoundly influence the distribution of restored ecosystem functions on the landscape. We investigated the consequences of rules applied to aggregation of ecosystem functions for wetland offsets in the Beaverhill watershed in Alberta, Canada. We considered the fate of 3 ecosystem functions: hydrology, water purification, and biodiversity. We set up an affect-and-offset algorithm to simulate the effect of aggregation rules on ecosystem function for wetland offsets. Cobenefits and trade-offs among functions and the constraints posed by the quantity and quality of restorable sites resulted in a redistribution of functions between affected and offset wetlands. Hydrology and water-purification functions were positively correlated and negatively correlated with biodiversity function. Weighted-average rules did not replace functions in proportion to their weights. Rules prioritizing biodiversity function led to more monofunctional wetlands and landscapes. The minimum rule, for which the wetland score was equal to the worst performing function, promoted multifunctional wetlands and landscapes. The maximum rule, for which the wetland score was equal to the best performing function, promoted monofunctional wetlands and multifunctional landscapes. Because of implicit trade-offs among ecosystem functions, no-net-loss objectives for multiple functions should be constructed within a landscape context. Based on our results, we suggest criteria for the design of aggregation rules for no net loss of ecosystem functions within a landscape context include the concepts of substitutability, cobenefits and trade-offs, landscape constraints, heterogeneity, and the precautionary principle.

why deny science when you can just make it up?

There is no reason to deny facts or evidence when you can just make up new ones that suit your pre-conceived notions, you truly believe anything that comes out of your own mouth is true, and tens of millions of other people do too.

This is not supposed to be a political blog. But it is supposed to be a blog about whether our civilization is progressing or at risk of a catastrophic downfall. And when the things in the first paragraph I just wrote are happening, I have to lean toward the catastrophic downfall side.

From Bloomberg:

“The ice caps were going to melt, they were going to be gone by now, but now they’re setting records,” Trump said in excerpts of an interview with Piers Morgan on the U.K. television network ITV broadcast Jan. 28. Trump didn’t specify the data behind his statement about setting records…

“There is a cooling, and there’s a heating,” he said. “I mean, look, it used to not be climate change, it used to be global warming. That wasn’t working too well because it was getting too cold all over the place…”

In 2014, less than a year before he entered the 2016 presidential race, president, Trump said on Twitter that the “POLAR ICE CAPS are at an all time high, the POLAR BEAR population has never been stronger. Where the hell is global warming.”

Anybody with some basic science or information literacy knows that a short-term fluctuation in the data does not prove or disprove a long-term trend. You can look at a lot of those short-term fluctuations together and begin to determine whether they represent random noise or whether they are consistent with some longer-term trend you are seeing in the larger data set, as scientists are doing with recent hurricanes, droughts and fires.

This was my favorite quote of all though:

“The Paris accord, for us, would have been a disaster,” Trump said in excerpts of an interview with Piers Morgan. “Would I go back in? Yeah, I’d go back in. I like, as you know, I like Emmanuel” Macron.

I can’t picture Emmanuel Macron, but what I can picture is Sasha Baron Cohen kissing Will Ferrell in Talladega Nights. Sometimes fiction actually does turn into reality!

more on movement ecology

I’m still digging into movement ecology, which has always fascinated me. Here is a comprehensive recent literature review on the subject.

Trends and missing parts in the study of movement ecology

Movement is important to all organisms, and accordingly it is addressed in a huge number of papers in the literature. Of nearly 26,000 papers referring to movement, an estimated 34% focused on movement by measuring it or testing hypotheses about it. This enormous amount of information is difficult to review and highlights the need to assess the collective completeness of movement studies and identify gaps. We surveyed 1,000 randomly selected papers from 496 journals and compared the facets of movement studied with a suggested framework for movement ecology, consisting of internal state (motivation, physiology), motion and navigation capacities, and external factors (both the physical environment and living organisms), and links among these components. Most studies simply measured and described the movement of organisms without reference to ecological or internal factors, and the most frequently studied part of the framework was the link between external factors and motion capacity. Few studies looked at the effects on movement of navigation capacity, or internal state, and those were mainly from vertebrates. For invertebrates and plants most studies were at the population level, whereas more vertebrate studies were conducted at the individual level. Consideration of only population-level averages promulgates neglect of between-individual variation in movement, potentially hindering the study of factors controlling movement. Terminology was found to be inconsistent among taxa and subdisciplines. The gaps identified in coverage of movement studies highlight research areas that should be addressed to fully understand the ecology of movement.

An idea that has always fascinated me is the idea that when designing a development or an even an entire urban area, you could actually lead with ecology, then layer hydrology, infrastructure, housing, and the other human elements on top of that. Sadly, I don’t think I know a single engineer or urban planner who would be particularly open minded to this idea.

models for movement and population ecology

This page has links to some academic/professional models of movement ecology and population ecology, such as predator-prey interactions. It’s something that interests me because with an accurate theory of how animals and plants function and interact in ecosystems over time, it should in principle be possible to design networks of urban, industrial, and agricultural areas that maximize ecological function.

Developing this knowledge would be step one. Of course, there would still be the small matter of our civilization deciding this is something it would like to do.

wildlife range in urban areas

Here’s an interesting study finding a general rule across many types of wildlife that their range after urbanization decreases to between one-half and one-third of what it was before urbanization.

Moving in the Anthropocene: Global reductions in terrestrial mammalian movements

Animal movement is fundamental for ecosystem functioning and species survival, yet the effects of the anthropogenic footprint on animal movements have not been estimated across species. Using a unique GPS-tracking database of 803 individuals across 57 species, we found that movements of mammals in areas with a comparatively high human footprint were on average one-half to one-third the extent of their movements in areas with a low human footprint. We attribute this reduction to behavioral changes of individual animals and to the exclusion of species with long-range movements from areas with higher human impact. Global loss of vagility alters a key ecological trait of animals that affects not only population persistence but also ecosystem processes such as predator-prey interactions, nutrient cycling, and disease transmission.

One type of animal included in the study was deer in Pennsylvania. I also learned the name of the academic discipline that studies animal ranges and movements: movement ecology.

the Trump infrastructure bill

The Trump infrastructure plan has apparently leaked. The upshot seems to be that states and metropolitan planning organizations, among others, can submit projects to be matched at up to 20% by the federal government. Most of the selection criteria are based on making a strong case that there is a plan to come up with the other 80%.

This sounds okay, as far as it goes, and it might get some projects over the hump that would not otherwise get built. I like the idea that metropolitan planning organizations are eligible, because they are in the best position to look at a city’s needs as a whole, across fragmented political entities and across types of infrastructure. Cities are where people live, where most of the economy happens and taxes are paid, and where people are educated and given skills and where new ideas come from that make our lives better in the long run. What I don’t really like is that economic and social benefits are given only 5% weight in the selection criteria. And even then, they are considered for an individual project in isolation, in the absence of any larger plan. In my ideal world, planning organizations would have comprehensive infrastructure plans that look at all types of infrastructure together over the long term, even including green infrastructure, and really focus on maximizing economic benefits. This would allow us to prioritize individual projects in the larger context of how the whole socioeconomic system works and not just on one “project at a time.

Still, this might be a small step in the right direction. Along with public infrastructure and some small steps to encourage capital investment, research and development in the private sector, add serious programs to address education, job skills training, and research and development in the public sector and you would have the beginnings of a long term national economic plan. Maybe toss in a revenue-neutral pollution tax for good measure.