On Fish Dispersal and the Perpetual Evil of the Duck
Tag Archives: lake
Water-Based Recreation Can Promote Non-Native Introductions
Image Credit: Manfred Antranias Zimmer, Pixabay licence, Image Cropped
Invasion of freshwater ecosystems is promoted by network connectivity to hotspots of human activity (2019) Chapman et al., Global Ecology and Biogeography, https://doi.org/10.1111/geb.13051
The Crux
The spread of invasive species throughout freshwater ecosystems is a topic we’ve looked at before on Ecology for the Masses. In a previous paper breakdown we talked about how recreational is heavily responsible for the presence of non-native fish at a European scale.
Our paper this week takes a more local approach. Can we predict the presence of non-native birds, invertebrates and fish by looking at the presence of human activity, and where that human activity is present?
Fishing for Invaders
Image Credit: California Department of Fish and Wildlife, CC BY 2.0, Image Cropped
Angling as a source of non-native freshwater fish: a European review (2019) Carpio, De Miguel, Oteros, Hillstrom & Tortosa, Biological Invasions, doi.org/10.1007/s10530-019-02042-5
The Crux
People love fishing. It’s an intrinsic part of some people’s lives, whether as a livelihood or a past-time. People who have grown up fishing often have specific species that they enjoy fishing for. Nothing wrong with that.
Yet people’s desire to go after one fish species will often lead them to move that species around. This can happen on a small scale, with people moving a species from one lake to another slightly closer to their homes. Or it can happen on a massive one, with a species being transported to new continents.
This has shaped entire freshwater communities in modern-day Europe, where 195 species now reside that have no natural range in the continent. Most of these have been introduced since the nineteenth century, which is around the time that fishing became a popular recreational activity. This week’s authors wanted to find out what the role of recreational fishing was in shaping the make-up of today’s invasive freshwater fish populations in Europe.
Monitoring Freshwater Populations in the Chernobyl Exclusion Zone
Radiation can have extremely negative effects on an individual. But is it as easy to measure its effects on an entire population? (Image Credit: Hnapel, CC BY-SA 4.0, Image Cropped)
Variation in chronic radiation exposure does not drive life history divergence among Daphnia populations across the Chernobyl Exclusion Zone (2019) Goodman et al., Ecology and Evolution, DOI: 10.1002/ece3.4931
The Crux
As anyone who has recently watched HBO’s Chernobyl can tell you, large doses of radiation are capable of doing some pretty serious damage to an organism. But whilst examining the effect of radiation on an individual might be simple, monitoring those effects on a population can be difficult. Whilst radiation negatively effects fitness, it can also help individuals with higher radiation tolerance to reproduce and dominate within the population of a single species, making it difficult to monitor the exact effects of radiation on that population. If a population is filled with only those who were strong enough to survive, you don’t get an idea of the variation in the radiation’s effects.
This week’s researchers tried to break through that problem by looking at different populations of a water flea in Chernobyl’s Exclusion Zone (CEZ) – the area still barred from entry in eastern Europe.
Life Under Lake Ice: A Mysterious (and Threatened) World
Image Credit: US National Park Service, Public Domain Mark 1.0, Image Cropped
Ice has become (pardon the pun) something of a hot topic lately.
Professional and amateur scientists alike have studied the timing of seasonal ice formation on lakes and rivers for hundreds of years, and the patterns that have emerged from these studies provide a window into the progression of climate change. Overwhelmingly, the data show that lakes and rivers are freezing up later in the winter and their ice cover is melting earlier in the spring than in the past.
Ian Winfield: Advancing Scientific Communication Through Cultural Anthropology
Image Credit: Ian Winfield, CC BY 2.0, Image Cropped
Scientific methods of communication with the public have been evolving ever since the first Universities were opened in the 1200s. Recent times have seen communication evolve in step with the digital age. But given our lack of progress in key areas in which scientists have long known we face problems, such as climate change, biodiversity and ocean pollution, one wonders if we’re doing our job well enough.
Ian Winfield is a freshwater ecologist at the Centre for Ecology & Hydrology in Lancaster, UK. Ian has spent years working in Northern England in an effort to conserve its populations of the Arctic charr, a common environmentally-demanding fish which has seen many of its populations in the polar regions come under increasing pressure. I took the chance to sit down with Ian at the recent International Charr Symposium in Duluth, Minnesota, and we discussed his experiences using cultural anthropology to encourage ecological action outside of the scientific community.
Making Lake Superior Again: Thoughts from the International Charr Symposium
Lake Superior, the location of the 9th International Charr Symposium (Image Credit: Environmental Protection Agency, Image Cropped)
