Image Credit: Danyell Odhiambo/ICRAF, CC BY-NC-SA 2.0
Local Adaptation to Biotic Interactions: A Meta-analysis across Latitudes (2020) Hargreaves et al., The American Naturalist, https://doi.org/10.1086/707323
Local adaptation is a process whereby individuals native to a given area are better-suited to live in that environment than foreign individuals, and those local individuals will out-compete foreign individuals. This adaptation to local conditions can range from a predator that is better at finding and catching prey, to a plant that is more efficient than another at taking nutrients from the soil, or to a host that has evolved defenses against a local parasite. Despite a wealth of literature and science that has been dedicated to the study of local adaptation, it is not clear what it is about the environment that commonly drives it.
Early studies of local adaptation measured abiotic (non-living) factors like temperature and the amount of light, but this ignores the fact that all environments include biotic factors like other species and any interactions with them. A small amount of studies have shown that biotic interactions (i.e. interactions with other species) can drive local adaptation, but there isn’t a consensus on how common of a pattern that is. Today’s authors used a meta-analysis of previous studies to test how these biotic interactions affect local adaptation. Read more
Image Credit: Dreamy Pixel, CC BY 4.0
Recent responses to climate change reveal the drivers of species extinction and survival (2020) Román-Palacios & Wiens, PNAS, https:/doi/10.1073/pnas.1913007117
We tend to think of climate change as bad, and despite the fact that some organisms will benefit from it, many others won’t. A big part of why we consider it bad is that species are predicted to be lost at an alarming rate, with some estimates as high as 54% of all organisms going extinct. An issue with these predictions is that they tend to assume that species will track their preferred temperature and precipitation conditions, but this eliminates any ability of organisms to adapt to their new normal over time.
Today’s authors wanted to use data from previous studies to estimate how species adapt (or don’t) to climate change. Although previous work has shown that climate change is detrimental for many species, this study aimed to learn if it was due to changes in the overall temperature, changes in the extremes (i.e. how hot the hottest day is), or was it the sheer speed of change that did organisms in. Read more
When animals like these wolves travel in packs, spotting one individual means we’re more likely to spot another soon after. So how do we come up with a reliable population estimate in situations like these? (Image Credit: Eric Kilby, CC BY-SA 2.0, Image Cropped)
The thought of an ecologist may conjure the image of a scientist spending their time out in the field counting birds, looking for moss, studying mushrooms. Yet whilst field ecologists remain an integral part of modern ecology, the reality is that much of the discipline has come to rely on complex models. These are the processes which allow us to estimate figures like the 1 billion animals that have died in the recent Australian bushfires, or the potential spread of species further polewards as climate change warms our planet.
When we think of global warming, we tend to be a bit selfish and think of how it affects us in our daily lives, but the warming temperatures on our planet have the potential to affect the base of all of our food webs, plants (Image Credit: Matt Lavin, CC BY-SA 2.0).
Phenology in a warming world: differences between native and non-native plant species (2019) Zettlemoyer et al., Ecology Letters, https://dx.doi.org/10.1111/ele.13290
The timing of life-history events (such as births, growing seasons, or reproductive period) is called “phenology”, and this aspect of an organism’s life is particularly sensitive to climate change. So much so that changes in the phenology of certain processes are often used as an indicator of climate change and how it affects a given organism.
We’ve talked about the effects of rising temperatures in animals here on Ecology for the Masses, but there is a lot of evidence in the scientific literature for climate change causing a multitude of different changes in the phenology of various plants. Not only does the direction of the change differ (some organisms experience delays in certain events, others have earlier starts), but the size, or magnitude, of the change also differs. The authors of today’s study wanted to examine these changes in the context of an invasive plant species and how it may be able to outcompete a native plant.
Growth is a critical aspect of life for all organisms, and understanding what can and cannot affect it allows us to predict what effect climate change may have on organisms like these zebrafish (Image Credit: Lynn Ketchum, CC BY-SA 2.0).
Warming increases the cost of growth in a model vertebrate (2019) Barneche et al., Functional Ecology, https://dx.doi.org/10.1111/1365-2435.13348
In ecology, how organisms grow is relevant across all levels of life. Growing faster than others can be selected for as an evolutionary advantage, if being bigger earlier means that you have a competitive advantage over other members of your species.
Because growth is so critical to life, it is important to understand what may affect the ability of an organism to grow. The only way an organism can grow is by converting energy it acquires from food to its own body mass, but outside influences, like temperature, can affect how efficient an organism is at this energy conversion. The authors of today’s paper wanted to investigate if this efficiency and the cost of growth itself changed across a range of projected temperatures.
Species like this red-crowned crane perform yearly migrations, but how do they weigh up the costs and benefits? (Image Credit: Alistair Rae, CC BY-SA 2.0, Image Cropped)
Where the wild birds go: explaining the differences in migratory destinations across terrestrial bird species (2018) Somveille, Manica & Rodrigues. Ecography, 42, p. 225-236.
Migratory birds make up a huge chunk of the world’s bird life, yet there are still a lot of gaps in our knowledge concerning why they migrate to the areas they do. There’s a variety of potential benefits to migration, from remaining within a comfortable temperature range or a preferred habitat, to gaining access to areas that have a surplus in resources, to escaping competition with resident species. However, migration also results in increased mortality due to the amount of energy it takes. This week’s study tried to analyse the drivers of migration, and what trade-offs were made between migration’s potential benefits and costs.
Miscommunication concerning ecosystems like the Great Barrier Reef can be extremely harmful to their future. I recently encountered a frustrating example of such misinformation. (Image Credit: Workfortravel, CC BY-SA 4.0, Image Cropped)
Scientific communication is at the forefront of what we do here at Ecology for the Masses. We like to celebrate good examples of SciComm whenever we can. But every now and then it’s misused so overtly that you have to talk about it. So today I want to share a recent example of scientific communication that confused and worried me.