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- Grazalema
And here is the Google translation from and interview with a leading biologist involved in rabbit studies.
Rafael Villafuerte, CSIC: “Los daños de los conejos son insoportables para muchos agricultores, pero son conejos silvestres” Original article here: https://www.20minutos.es/noticia/5119971/0/rafael-villafuerte-del-csic-danos-conejos-insoportables-conejos-silvestres/
For decades there have been voices that have come to indicate that they were Australian rabbits
What measures were taken to respond to complaints from the primary sector?These different beliefs led several autonomous communities in which rabbits were creating great damage to agriculture to ask Dr. Francisca Castro (currently at the University of Córdoba) for a rigorous genetic analysis. This was the case of Catalonia, the Valencian Community, or Castilla-La Mancha. More recently, we repeated the sampling and analysis with many more genetic markers. The result made in Castilla-La Mancha is absolutely conclusive: the rabbits are not domestic but wild and in addition to the Oryctolagus cuniculus species , that is, the one from our natural environment.These results agree with other work that we carried out in 2015 and led by Dr. Vicente Piorno (Xunta de Galicia), in which it was experimentally verified that the persistence of domestic or “hybrid” rabbits with domestic rabbits released into the natural environment was fortunately minimal. . In the domestication process we are very clear that the greatest differentiations occurred in the genes that control development and the nervous system. Broadly speaking, domestic rabbits are not afraid, which makes them the first to be preyed on or killed by hunters.
Has the abandonment of domestic rabbits in Spain been monitored?I have not known in my scientific career a single case of abandonment of rabbits in the natural environment. If this unfortunate fact has ever happened, the survival of these animals will be very low for what I have mentioned before.
Those affected maintain that there are rabbits “more voracious, with greater reproductive capacity” and, in general, they allege a genetic improvement. Does this have scientific support?Hybrids, voracious, high reproductive capacity, abnormal behaviour… There are many descriptions attributed to it. Not all true. As for the fact that they are basically hybrid wild rabbits with domestic ones, as I have already said, our analyzes have been very conclusive: this is flatly false, at least in Castilla-La Mancha where we have terminated the genetic analyzes of thousands of samples. collected on the ground
.
Regarding the high reproductive capacity, it should be taken into account that rabbits are capable of going into heat as long as the food ingested exceeds 20% protein, something that will easily occur in agricultural areas, but also in areas where the vegetation has not developed defensive strategies against rabbits, as has happened in many regions of the world where the species has been introduced.How then could the alarm and the myth of hybridization spread so much?Unfortunately, the existence of the two subspecies of wild rabbit is little known in non-academic environments, possibly because they have almost the same morphological appearance (something that happens to all rabbits in the world). A misinterpretation of the existence of hybrid rabbits (I insist, they are wild) between the two known subspecies of the species may have helped spread this false hoax.
And what about other alleged anomalous behaviors such as climbing trees or being extraordinarily large?In general, cultivable plants have little or no defenses, something that many peninsular wild plants that have co-evolved with rabbits do. Rabbits (like many other species of wild herbivores) select cultivable plants over others with less nutritional richness or palatability. Supposedly abnormal behaviors such as climbing trees, or eating the bark of fruit trees, is unfortunately natural, especially if that is the only food available. The higher quality of food will be associated with greater body growth, something that has also been verified precisely with rabbits. The wild rabbits of Australia or England (both of the subspecies Oryctolagus cc), are much larger than the Iberian rabbits of that same subspecies. Animals that have rich and abundant food are usually larger. For example, we are -on average- older than our grandparents and giants for our great-grandparents. In one or two generations with abundant food (and with fewer predators disturbing feeding and breeding), rabbits will necessarily be larger and have a higher reproductive rate. It has also been shown that higher abundances
of
rabbit in these situations lead to a higher prevalence of antibodies against viral diseases (such as myxomatosis or rabbit haemorrhagic disease), which results in them appearing immune to diseases.Only 4.8% of abandoned rabbits have a chip, despite being mandatory since 2016
What are your conclusions regarding the alarm about the high presence of rabbits and the false existence of hybrids?Rabbits have been taking advantage of roads, highways and railways to colonize agricultural areas where before they were little or not frequent. The cocktail is served: for people not used to seeing rabbits in many of these areas, more or less bizarre explanations have been emerging that they are exotic, immune and extremely voracious animals.I begin to believe that the idea of supporting at all costs the belief that these are “non-wild” animals by certain sectors is stubbornly maintained. We must bear in mind that, for example, if it is about wild animals, control is subject to much more restrictive regulations than if it were an exotic, introduced species or, for example, a hybrid with a domestic one.
I am very clear that the damage caused by rabbits is really unbearable for many farmers, and it is necessary to seek urgent solutions. However, it is advisable to rely on data obtained and analyzed with the rigor required by the scientific method.
I am very clear that the damage caused by rabbits is really unbearable for many farmers.
Speaking of our two native species: what is the current situation of their populations?Approximately 70% of the populations that we are analyzing since 1993, when we began the first large-scale study of abundance, have a negative population trend or have even gone extinct. In fact, the rabbit is a species listed as endangered by the International Union for Conservation of Nature (IUCN). However, this occurs in “natural” areas, while many rabbit populations in agrosystems remain stable or are growing. Many of these are the ones that generate problems in crops.
There are numerous images on social networks of peri-urban roundabouts and railway lines with an abundant presence of rabbits. Why do they settle in these types of environments? Do they pose any risk?Railway lines and roads (especially highways due to the fact that they are fenced) are an important aid to the presence and connectivity of rabbit populations. The lack of predators and the presence of food close to these infrastructures can occasionally lead to significant abundances of rabbits. This is the case of large and medium roundabouts. In general, it does not usually pose a significant problem for humans except for some risk of collisions. However, in some areas, usually further away from the cities, the high presence of rabbits attracts certain predators such as lynx, many of which may end up being run over.
That is to say, that in these settlements, they are less exposed to their predators, is that correct?Rabbits have many natural predators in the Iberian Peninsula. There are some that are super-specialized in their consumption, such as the lynx, but there are also more opportunistic or generalist ones, such as foxes or kites. For obvious reasons, specialists (such as the lynx or the imperial eagle) have had and still have severe problems if their main prey species declines. However, and despite the fact that rabbits may be abundant in some areas (for example, in agricultural systems or lagoon complexes), this does not imply that it is a good place for the presence of these predators. These things are never that simple.
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