A reintroduced ecosystem engineer species may exacerbate ongoing biological invasion: selective foraging of the Eurasian beaver in floodplains (2020) Juhasz et al., Global Ecology and Conservation, https://doi.org/10.1016/j.gecco.2020.e01383
The reintroduction of species to an area from which they have been wiped out can have benefits which extend beyond that one species. Often they can restore ecological functions that have since been lost, which can result in everything from an increase in biodiversity to restructuring of an entire landscape.
That last example might seem a bit far-fetched, but beavers (Castor fiber) are capable of just that. Their damming activities can change river flows and restore healthy floodplains, and as such beavers are the target of a large reintroduction campaign now occurring throughout much of Europe.
But what happens when a species like the beaver is reintroduced to an ecosystem that has seen significant changes since it has been gone, like the introduction of invasive species? Today’s authors wanted to find out whether or not the presence of the beaver benefited native plants, or whether it made things easier for the invasive species.
Image Credit: Bernard Dupont, CC BY-SA 2.0, Image Cropped
Projecting the continental accumulation of alien species through to 2050 (2020) Seebens at al., Global Change Biology, DOI: 10.1111/gcb.15333
A by-product of globalisation is that over the coming decades, no matter how many episodes of Border Patrol get recorded, new species are going to find their way into new habitats and potentially become invasive alien species, exerting negative effects on the locals. We’ve seen this in the past, and I’ve beaten many a dead horse writing about these species on this site.
What this paper set out to find is whether or not we can predict at what scale this trend will increase.
Image Credit: Tiit Hunt, CC BY-SA 3.0, Image Cropped
First record of niche overlap of native European plaice (Pleuronectes platessa) and non-indigenous European flounder (Platichthys flesus) on nursery grounds in Iceland (2020) Henke et al., Aquatic Invasions, In Press
Determining whether or not an introduced species is invasive is important, as it determines whether or not management steps need to be taken to slow or eliminate any negative impacts it might have on the local ecosystem. In Iceland, 15 introduced species have been recorded over the past decades but only six of them are currently classified as invasive or potentially invasive. One of these potentially invasive species is the European flounder (Platichthys flesus), a flatfish commonly found in coastal waters of Europe. The flounder is a catadromous fish, meaning it spawns in marine habitats but has the ability to survive in freshwater streams as well.
In 1999, the flounder was firstly identified in Icelandic waters in the southwest of the country. Since then it has rapidly spread clockwise around the country. Currently, it can be found in every part of Iceland, mostly in estuaries but also up in rivers and lakes. Juvenile flounder can be found on nursery grounds in shallow, brackish waters where they overlap with juvenile European plaice (Pleuronectes platessa). Plaice is a commercially important flatfish species native to Iceland. Despite the knowledge of the flounder’s arrival in Iceland in 1999, not much research has been conducted on the impact of this potentially invasive species.
Image Credit: Alexey Komarov, CC BY-SA 4.0, Image Cropped
While outdoor and feral cats are pretty universally accepted by scientists these days to be environmental hazards of the most destructive kind, the fact remains that they’re… well, cats. They’ve been companion animals for millenia, and often the general public react strongly against proposed measures for feral cats (or even to being told to keep their own cats indoors).
So why is it that despite a wealth of science making the case for feral cat management, many people simply can’t get on board with keeping them in check? And why do ecologists even need the public onside in the first place?
To dig a bit deeper, I spoke to Brooke Deak, a socioecologist based at the University of Adelaide. Brooke has spent the last three years studying the feral cat management debate, trying to better understand the relationship between feral cats and the general public.
Image Credit: Birgit, Pixabay Licence, Image Cropped
The potential current distribution of the coypu (Myocastor coypus) in Europe and climate change induced shifts in the near future (2020) Schertler et al., NeoBiota, https://doi.org/10.3897/neobiota.58.33118
For all my talk on not immediately demonising alien species, there are a plethora of annoying little critters who the label ‘invasive’ was made for. This is the case with the Coypu, an annoying beaver-like rodent initially from South America who has since spread through other parts of the world, including large swathes of Europe.
The Coypu is a textbook invader – it reproduces quickly, and though individuals don’t stray far from rivers, as a species they are capable of expanding their range very quickly. They destabilise riverbanks through their burrowing, which can lead to severe ecological and economical damage.
They are, however, quite sensitive to temperature, and as such it’s important to know what the effects of climate change will have on their distribution. Today’s authors set out to come up with a habitat suitability map for the Coypu in light of the rise in temperature we’re expecting in the coming decades.
As it quickly became clear in late February and early March that COVID-19 was not going away anytime soon, attention turned to trying to figure out when and where the virus would spread. Epidemiologists and virologists have had their work cut out for them, trying to simultaneously reassure and warn people the world over about the dangers, the nature and the potential timeline of the virus.
So it came as somewhat of a surprise to see ecologists try and tip their hat into the ring. Early on in the pandemic, teams of ecologists sprang up, trying to use Species Distribution Models to predict the spread of the virus. And whilst this might sound helpful, many of these studies lacked collaboration with epidemiologists, and their predictions very quickly fell flat. Some studies suggested that areas like Brazil and Central Africa would be largely spared by the virus, which quickly turned out not to be the case. Flaws in the studies were spotted quite quickly by concerned members of both the ecological and epidemiological communities alike, and a few teams got started on responses.
The Burmese python, which has spread throughout the Everglades in Florida as a result of accidental or intentional releases by pet owners (Image Credit: US NInvaders, Aliens, and tational Park Service, Public Domain Mark 1.0, Image Cropped)
Language is important. It’s a lesson many biological scientists would have learned a long time ago if we hadn’t kept social sciences at such a wary arm’s length. Ecologists have a tendency to label and relabel ecological concepts (anyone up for a debate about the word ‘niche’?), species and even global phenomena (think global warming vs. climate change) based on anything from shifts in public perception to new findings that challenge our earlier labels.