Differential host utilisation by different life history stages of the fish ectoparasite Argulus foliaceus (Crustacea: Branchiura).

In this study we examine differences in the occurrence of life history stages of the destructive fish ectoparasite Argulus foliaceus (L., 1758) on eight fish species (stickleback, rudd, roach, gudgeon, bream, tench, crucian carp and common carp) sampled from a mixed-species recreational fishing lake on nine occasions during late spring and summer. Total numbers ofA.

Secretory immunoglobulin A reactivity to acute and cumulative acute multi-tasking stress: relationships between reactivity and perceived workload.

The effects of an acute stressor upon secretory immunoglobulin A (S-IgA) were assessed using a task that requires participants to attend and respond to several stimuli simultaneously and is therefore analogous to a variety of working environments. In two studies, the task was administered for periods of 5 min to healthy samples of men and women at two sessions 24 h apart (n = 49) and three times in succession within one session (n = 20). Multi-tasking stress was, at all sessions, associated with increases in S-IgA secretion.