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Lepidoptera is one of the most diverse orders of insects, their larvae are very abundant in many habitats, and frequent prey of various predators. To decrease predation risk, caterpillars developed several means of defence, among them timing their activity to avoid predators (seeking enemy-free time). Although the enemy-free time hypothesis is often invoked to explain caterpillar behaviour, empirical evidence for it is scarce. We tested whether such enemy-free time exists in a temperate forest by comparing predation pressure on artificial caterpillars during day and night on the ground in forest fragments in Denmark. We found a high predation rate, 23.9%d-1, and higher predation rate at night (30.9%d-0.5) than during the day (17.0%d-0.5), both by invertebrate (23.3%d-0.5 vs. 12.4%d-0.5) and vertebrate (8.5%d-0.5 vs. 3.3%d-0.5) predators. The most important predators were chewing insects (73.4% of all attacks) and small mammals (19.0%). Attack rates on red caterpillars were higher (30.0%d-1) than on green ones (19.5%d-1). Overall, these data do not support the idea that night activity can provide enemy-free time for solitary caterpillars on the temperate forest floor.

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Journal of Behavioral Addictions
Authors:
Claudia Marino
,
Tatiana Marci
,
Lucrezia Ferrante
,
Gianmarco Altoè
,
Alessio Vieno
,
Alessandra Simonelli
,
Gabriele Caselli
, and
Marcantonio M. Spada

Background and aims

Recent research used attachment theory and the metacognitive tenet as frameworks to explain problematic Facebook use (PFU). This study aims to test, in a single model, the role of different attachment styles and metacognitions in PFU among adolescents.

Methods

Two separate studies were conducted in order to establish the link between security (Study 1) and insecurity (Study 2), metacognitions, and PFU. A total of 369 and 442 Italian adolescents (age: 14–20 years old) participated in Study 1 and Study 2, respectively.

Results

Path analyses revealed the relative importance of different attachment dimensions with mother and father in predicting PFU and the mediating role of metacognitions between attachment styles and PFU.

Discussion and conclusion

In conclusion, since attachment styles and PFU may significantly affect adolescents’ development and well-being, the results of this study may provide some practical indications for researchers and practitioners.

Open access