Johann Prescher made this video.
North of Lienden is the Marspolder nature reserve; where we went on 23 April 2018.
Much of this area became a nature reserve recently.
Arriving at the Marsdijk, a jay flying.
A chaffinch sings.
In the Rhine river swim two great crested grebes,
Two great cormorants fly past.
Lady’s smock flowers.
White dead-nettle flowers.
Edible frogs in a ditch. Like this one.
In the nature reserve, male and female tufted ducks. And a great crested grebe couple.
A little owl on a polled willow.
In a pond, a mallard couple and a male mandarin duck.
This Dutch poster depicts a frog, saying We
will can already pass safely under the road.
THe Vriezenveen (Overijssel province) branch of the KNNV natural history society, helped in reconstructing a local road, adding two tunnels for passing amphibians, 1000 meter of walls to guide the amphibians towards the tunnels and five access possibilities for agricultural traffic.
This video says about itself:
Frogs vs. Fungus | National Geographic
22 September 2009
That was then. And now …
From Science, 30 March 2018:
Shifts in disease dynamics in a tropical amphibian assemblage are not due to pathogen attenuation
Resistance is not futile
The fungal disease chytridiomycosis has wreaked havoc on amphibians worldwide. The disease is caused by the organism Batrachochytrium dendrobatidis and was first identified in the late 1990s. Voyles et al. revisited protected areas in Panama where catastrophic amphibian losses were recorded a decade ago (see the Perspective by Collins). Although disease theory predicts that epidemics should result in reduced pathogenicity, they found no evidence for such a reduction. Despite this, the amphibian community is displaying signs of recovery—including some species presumed extinct after the outbreak. Increased host resistance may be responsible for this recovery.
Infectious diseases rarely end in extinction. Yet the mechanisms that explain how epidemics subside are difficult to pinpoint. We investigated host-pathogen interactions after the emergence of a lethal fungal pathogen in a tropical amphibian assemblage. Some amphibian host species are recovering, but the pathogen is still present and is as pathogenic today as it was almost a decade ago. In addition, some species have defenses that are more effective now than they were before the epidemic. These results suggest that host recoveries are not caused by pathogen attenuation and may be due to shifts in host responses. Our findings provide insights into the mechanisms underlying disease transitions, which are increasingly important to understand in an era of emerging infectious diseases and unprecedented global pandemics.
See also here.