Final answer:
Leiningen has made extensive preparations to safeguard his plantation from potential dangers, specifically against an onslaught of marching, ravenous ants, as the question and various texts concerning insect swarms and their impacts on communities and ecosystems suggest.
Step-by-step explanation:
Leiningen's attitude is that he has prepared his plantation for anything that could happen, including the marching, ravenous ants. This is inferred from various references to insect plagues and struggles in historical and contemporary contexts. For instance, locust swarms, such as the one described in Mauritania, can devastate vegetation, a fact which is likely to have inspired similar fictional situations.
Moreover, historical references to insect assaults and their disastrous impact on ecosystems, such as the damage caused by a swarm of locusts stripping the bark off trees, or the aggressive behavior of the red imported fire ant towards other ant species, illustrate the severe challenges posed by insect infestations. In literature and actual historical accounts, swarms of insects, particularly ants, are often depicted as overwhelming and unrelenting forces against which humans must struggle to protect their livelihoods, echoing Leiningen's concerns and preparations against these tiny yet formidable invaders.