Decreases in river discharge can negatively affect fish like this sucker, but what happens when they’re compounded by local changes in land use? (Image Credit: Hotash, CC BY 2.0, Image Cropped)
Anthropogenic land-use change intensifies the effect of lows flows on stream fishes (2019) Walker, Girard, Alford & Walters, Journal of Applied Ecology, https://doi.org/10.1111/1365-2664.13517
Human activity can create a lot of different problems for the world’s ecosystems. These problems can impact an ecosystem simultaneously, often in different ways. For instance, a warming climate might push some species further towards the poles, but human structures like factories or mines might impede their dispersal. It’s relatively easy to study the effect of any one stressor that we place on a species, but looking at the interaction of multiple human-caused stressors is more difficult.
Take freshwater ecosystems. A warming climate means that there’s less snow and more rain in the winter, which reduces the river’s flow (or discharge) in summer. At the same time, nearby human construction can reduce nearby plant life, which in turn increases the amount of sediment washed into a river and lowers water quality. But do the two effects combined simply equal the sum of their parts, or does that combination make the total effect on local species even worse?
Image Credit: Joey Doll, CC BY 2.0, Image Cropped
Conservation or politics? Australia’s target to kill 2 million cats (2019) Doherty et al., Conservation Letters, https://doi.org/10.1111/conl.12633
We’ve talked a lot lately about competition between causes on Ecology for the Masses. Often when extra attention is given to one cause over another equally valid cause, it’s a product of social trends coinciding at the right time, sudden events capturing the public interest (think the Notre Dame fire) or a particularly effective marketing campaign. But sometimes a cause or a conservation target can be used to deliberately distract the public from another cause, and it’s a potential example of this that we’re looking at today.
Australia has long had an issue with cats. They’ve decimated populations of native species, playing a large hand in the extinction of many species found nowhere else. So it makes sense that part of Australia’s first Threatened Species Strategy would be to minimise the impact of cat populations on local wildlife. The strategy included a target of 2 million cats being killed between 2015 and 2020. Whilst this might sound like a reasonable goal, this paper argues that the actual scientific evidence supporting the target is pretty weak, and goes into some alternatives and motives.
Kiftsgate Court Garden: The Wild Garden 1. An example of a “wild garden” in the UK, where the plants have been left to grow (Image Credit: Michael Garlick, CC BY-SA 2.0, Image Cropped)
How do you make your garden more biodiversity-friendly? During my time at the Futurum exhibition at The Big Challenge Science Festival, I spent a lot of time talking to people who expressed a desire to be manage their gardens for more plants and animals, but were unsure where to start. So I’ve compiled a brief guide on what to do, and it’s your lucky day – it involves not doing anything.
Koalas are gorgeous, no doubt. But does their overwhelming charisma mean that we forget about other species? (Image Credit: Erik Veland, CC BY-SA 3.0, Image Cropped)
Australia plays host to a wonderful range of very endearing species. Tourists come from the world over to get up close with kangaroos or koalas. But the charisma of these animals can often lead to issues, whether it’s prioritisation of resources for them over other more endangered species, or even to the detriment of the species themselves.
Doctor Kath Handasyde of Melbourne University has been working with Australian field wildlife for almost 40 years, and is perhaps the most charismatic teacher I had during my Bachelor’s at the same institute. During my time in Melbourne, I had the chance to talk to Kath about the sometimes problematic role of charismatic species in Australian wildlife conservation.
Image Credit: pxhere, CC0 1.0, Image Cropped
When I’ve talked about anthropogenic effects, I’ve been guilty of focussing far too much on climate change and land use. But our dependence on toxicants like pesticides also has a profound impact on ecosystems, freshwater ecosystems in particular. On her recent visit to NTN in Trondheim, I spoke to ecotoxicologist Dr. Marie-Agnes Coutellec about her research group’s work with pesticides, and the likely future for much of Europe’s aquatic life.
Image Credits: Ian Winfield, Cory Goldsworthy, Matt von Konrat, CC BY-SA 2.0
Two weeks ago, I published Part One of our look into how ecology has changed over recent decades. My colleague Kate Layton-Matthews and I have put this question to a number of ecological researchers from all over the world. Here are some more responses on how our field has evolved, from the publishing of papers to land clearance to the job market.
The Indian Pond Heron, one species which could face population declines as a result of climate change (Image Credit: Dr Raju Kasambe, CC BY-SA 4.0, Image Cropped)
Rapid warming is associated with population decline among terrestrial birds and mammals globally (2018) Spooner et al., Global Change Biology, DOI: 10.1111/gcb.14361
The term climate change is almost ubiquitous these days. Humans tend to concentrate on how the warming of certain parts of the globe will affect them, but the species we share the globe with also experience a myriad of effects at the hands of climate change. These include rising temperatures constricting the ranges of some species and concurrently extending the range of others, who can move into areas that were previously too cold for them.
Whilst the focus of climate change has often been on species range shifts, the effects on species abundances are less well studied. This paper attempts to quantify the effects of climate change on a large number of bird and mammal species, whilst accounting for other factors which could affect species abundances, like rates of land use by humans, species body size, and whether or not the animals are in a protected area.