Search results for "Lander"
showing 10 items of 33 documents
Alpo Silander ja Suomen lehdistöhistoria
2023
Before and After Science: Radcliffe-Brown, British Social Anthropology, and the Relationship Between Field Research, Ethnography, and Theory
2020
In Radcliffe-Brown’s theoretical program of social anthropology as a “natural science of society” empirically grounded and making extensive use of the “comparative method” for aims of generalization about social phenomena, the ethnographical method according to Malinowski’s principles was seen as a fundamental research tool useful not only for guaranteeing scientific reliability to the work of collecting and recording ethnographic documentation but also for empirically testing theoretical hypotheses. It was thus often supposed that ideally the latter had to orientate the selection of particular research topics before starting fieldwork and while carrying out it. In the first part of the pap…
Starvation endurance in the antTemnothorax nylanderidepends on group size, body size and access to larvae
2013
Social interactions in animal groups can buffer environmental stress and may enhance survival under unfavourable conditions. In the present study, the impact on starvation endurance of social group, access to larvae and cold shock is studied in the ant Temnothorax nylanderi Forster. Resource sharing is expected to lead to grouped workers surviving longer than isolated ones. Access to larvae may increase longevity if larvae serve as food, or may interfere with survival if they induce caring behaviour in workers. Cold shock serves as a stress factor and a negative influence on survival is expected. The results show that isolated workers have a shorter lifespan than grouped workers, which in t…
Large body size variation is linked to low communication success in tandem running ants
2019
AbstractDiversity in animal groups is often assumed to increase group performance. In insect colonies, genetic, behavioral and morphological variation among workers can improve colony functioning and resilience. However, it has been hypothesized that during communication processes, differences between workers, e.g. in body size, could also have negative effects. Tandem running is a common recruitment strategy in ants and allows a leader to guide a nestmate follower to resources. A substantial proportion of tandem runs fail because leader and follower loose contact. Using the ant Temnothorax nylanderi as a model system, we tested the hypothesis that tandem running success is impaired if lead…
The parasite's long arm: a tapeworm parasite induces behavioural changes in uninfected group members of its social host.
2015
Parasites can induce alterations in host phenotypes in order to enhance their own survival and transmission. Parasites of social insects might not only benefit from altering their individual hosts, but also from inducing changes in uninfected group members. Temnothorax nylanderi ant workers infected with the tapeworm Anomotaenia brevis are known to be chemically distinct from nest-mates and do not contribute to colony fitness, but are tolerated in their colonies and well cared for. Here, we investigated how tapeworm- infected workers affect colony aggression by manipulating their presence in ant colonies and analysing whether their absence or presence resulted in behavioural alterations in…
Investigations on the geographical variability of the human transferrins.
1971
On the basis of own and from the widely scattered literature compiled materials the geographical distribution of the transferrin alleles is discussed. They reveal a characteristic distribution pattern, as the slow Tf variants produced by TfD alleles are obviously more frequent in tropical than in non-tropical populations. Considering similar results in cattle and its interpretation by Ashton (1958, 1965), it is hypothesized, that the relatively high TfΓ frequencies in tropical biotops might be a selective adaptation to their special climatic conditions. In this connection an association between slowly moving transferrin proteins in man and tolerance to hotter climates — as could be found in…
FEASTING WITH THE OUTLANDER
2015
While tv programs tend to acclaim cooks, by testing their ability in showcookings, challenging their skills on special talent shows and even by inviting them as opinion leaders commenting on the current affairs, cinema still prefers celebrating conviviality. Showing people having a meal together around the table involves celebrating eating as a basic transformative act, more or less orchestrated by a cook who contributes to create actual experiences by means of his services. Through them, he reconstitutes the existence of individuals, of communities or even of entire countries. This means that, in principle, the mission of the cooks on most movies operates on a level at the same time broade…
Parasite presence induces gene expression changes in an ant host related to immunity and longevity
2021
Most species are either parasites or exploited by parasites, making parasite&ndash
Data from: Ant societies buffer individual-level effects of parasite infections
2012
Parasites decrease host fitness and can induce changes in host behavior, morphology, and physiology. When parasites exploit social insects, they influence not only infected individuals but the society as a whole. Workers of the ant Temnothorax nylanderi are an intermediate host for the cestode Anomotaenia brevis. We studied a heavily parasitized population and found that while parasite infection had strong and diverse consequences for individual workers, colony fitness remained unchanged. On the individual level, we uncovered differences among the three worker types: infected and healthy workers from parasitized colonies and healthy workers from non-parasitized colonies. Infected workers we…