A study prepared by the Barcelona Public Health Agency (ASPB) calculate that
the rat population in Spain is almost 19,570,000 specimens, which is equivalent to a proportion of just over 4 specimens for every 10 inhabitants.
The estimate was obtained by scrutinizing 900 kilometers of sewerage network in Barcelona, where the technicians set up a series of traps to capture these rodents that made it possible to calculate a population of about 200,000, adding those who live in the visitable network and those who do so in the non-visitable network, according to a statement provided by the company EZSA Sanidad Ambiental.
Taking these figures as a reference and applying them to the Spanish sewerage network, which has a length of 165,000 kilometers, the exact number of rats would amount to 19,568,816 or, which is the same, 4.1 for every 10 Spaniards.
The plague of rats is one of the main problems of this type that affect the peninsular territory, especially in the north, center and west, but “cockroaches are the queens”, since each year they are positioned as “the first plague and main enemy of pest control in our country, along with rodents” and they are present at any time of the year and throughout the territory.
The two predominant varieties with the American cockroach, especially in the south and east thanks to the heat and humidity, and the Germanic in the rest of the Peninsula.
The Germanic is “the owner of the kitchen” and hides in the cavities of the walls, the motors of the electrical appliances, kitchen cabinets and garbage containers., while the American is “the queen of the sewer system, although he is already taking a liking to private houses, bars and restaurants” according to this analysis.
In addition to the “perennial pests” of rats and cockroaches, between the months of April and October there are others of a seasonal nature such as termites in the north and east of the peninsula, the Asian wasp also in the north and especially in Galicia, flies and mosquitoes in the south and the processionary caterpillar especially in Aragon.
The factors that respond to the different distribution of pests include climatic conditions, globalization or the type of constructions in each territory.
In the case of insects, it must be remembered that they are exothermic, that is, they depend on the ambient temperature to survive because they do not generate their own body temperature like mammals and that is why they are lethargic or die in cold seasons.
The increase in temperature as a consequence of climate change has contributed, according to this report, to the fact that some species survive longer and extend their time of proliferation and maturation, as well as to extend their habitat to areas that were not before.