A simple hole in the yard, dug to a depth of 0.6 meters, has caused a stir due to its ability to quickly transform the environment. Designed to collect meltwater and rain, it became an unexpected habitat for local wildlife within a few weeks.
Five groups of forest frog eggs quickly appeared, surrounded by branches, leaves, and native vegetation that provided shelter for various species.
This phenomenon, although domestic, is part of a larger ecological process. Temporary ponds are ecosystems that thrive precisely because they are not permanent and are free of fish, which benefits amphibians. For garden owners, creating a small pond can enrich biodiversity as long as it is properly managed.
Frog Eggs
Known as spring pools or vernal pools, these seasonal water bodies form with rain and meltwater, existing for a few months before drying up in mid to late summer. In this case, the goal was to maintain the water until August, avoiding it becoming a permanent lake.
By drying up regularly, fish find it difficult to colonize these pools, which is crucial as they are predators of eggs and amphibian larvae. Therefore, in garden ponds, it is preferable to avoid introducing fish if the arrival of frogs is desired.
The pond’s location was selected in an area where water naturally flowed in spring. Auxiliary depressions were built to reduce erosion, and the extracted soil was used to form a clay barrier, allowing for seasonal drying.
Quickly, the pond was colonized by forest frogs, and five groups of eggs were observed in the water. These hatch approximately three weeks after being laid, depending on the temperature, highlighting the importance of the proper duration of temporary pools.
The pools not only benefit amphibians but also provide mud for swallow nests and improve the habitat for birds and mammals. In Europe, Mediterranean temporary ponds are recognized as a priority habitat, being part of the EU’s Habitats Directive.
To maintain these habitats, it is crucial to manage the water without allowing the introduction of fish, as a recent study links their appearance to depth, size, and proximity to human settlements.
Additionally, the variability of the Mediterranean climate can affect the availability of water, highlighting the importance of a design that supports seasonal fluctuations.
Finally, amphibians spend much of the year on land, so an environment with soft edges and vegetation is as vital as the water itself. The appearance of fish in constructed ponds has been documented in a recent study published in Scientific Reports.
