Image Credit: European Wilderness Society, CC BY 4.0, Image Cropped
Tag Archives: species richness
I’ve written about fixed, mixed, and random effects in linear models before (and others have too) but I think it’s time to approach the topic with some ecology motivation. What do these different types of effects mean to us in the wild and when might we need to use one over the other? Read on to learn more!Read more
Urban aliens and threatened near-naturals: Land-cover affects the species richness of alien- and threatened species in an urban- rural setting (2020), Petersen et al., Scientific Reports, https://doi.org/10.1038/s41598-020-65459-2
Land-use changes (in particular, urbanisation and everything related to it) have huge effects on biodiversity patterns – some habitats can support populations of many different species, others cannot. This seems intuitive on a large scale (think a rainforest vs. a large, industrialised city) and on a small scale (a small patch of concrete vs. a patch of soil in a forest), but what about on a medium scale, more relevant to management organisations? How different species of plants, animals and fungi are distributed in space on such a meso-scale is far more relevant to everyday management, compared to say a global distribution, or the organisation of a 10 x 10 metre quadrant.
Today’s authors (myself and my current supervisors) looked at how species richness changes with land-cover on a municipality scale. We also looked at whether these patterns differ if one considers the total number of species, threatened- or alien ones, and whether animals, plants and fungi react to concrete vs. forests in the same way.
Livestock grazing regulates ecosystem multifunctionality in semiarid grassland (2018) Ren et al., Functional Ecology, DOI: http://doi.org/10.1111/1365-2435.13215
Grassland is the most common type of land cover on our planet, and about one third of the Earth’s population depends on these ecosystems to survive. Grasslands are not only the most common terrestrial ecosystem, but they are also some of the most vulnerable to degradation.
Sustainable grazing practices on these ecosystems are incredibly important when trying to maintain or improve the health of the many organisms that call grasslands home. The challenge with maintaining ecosystem multifunctionality is that trade offs between different functionalities are common, making it difficult to accomplish every goal at once. When managers try to maximize the productivity of a system this may reduce the overall diversity, as this often involves promoting the dominant plant species at the expense of every other species. The authors of this study were interested in determining the effects of grazing on environmental multifunctionality, so they analyzed what impact grazers had on multiple traits of the grassland ecosystem. Read more