Summary: Gonçalves et al. (2012)

The white seabream Diplodus sargus is an economically important fish that shows high levels of aggression in captivity, making aquaculture difficult. In this study, Gonçalves et al. (2012) assessed growth rate and dominance hierarchies in seabream to test whether stable dominance orders can be established in captivity and whether dominance status affects rate of growth and body condition. They established 8 groups consisting of 6 individuals and measured the linearity of hierarchies every week, and the stability of these hierarchies on a week-to-week basis, for 6 weeks. They found that the dominance structures followed a linear pattern and were stable between weeks. However, there was no significant correlation between the dominance index and both growth rate and final body condition. They conclude that aggressive competition is not the primary cause in growth differences, although longer term effects induced by stress may be contributing factors.

Summary: Kelley & Endler (2012)

Visual illusions are created when object or scene geometry is changed to trick the perception of the viewer when observing that scene/object from a specific direction. While many studies on sexual selection aim to compare signal strength, the components of the signal, and the processing of the information by the receiver's senses may interact to form visual illusions that are misleading (or are designed to capture attention). Kelley & Endler (2012) found that male great bowerbirds Ptilonorhynchus nuchalis create forced-perspective illlusions to female perceiver's in the bower avenue by actively maintaining size-distance gradients of the objects they use to create the bower court. They found that mating success and the female's perception of the gradient are significantly related and suggest that the use of illusions in mating and courtship might be more widespread than originally thought, based on orientation and distance characteristics used by males of multiple species.

Summary: Maciá et al. (2004)

In this short note, Maciá et al. (2004) report new observations of flying behaviour in the Caribbean reef squid Sepioteuthis sepioidea. They distinguish between flying and gliding this type of airborne jet propulsion appears more active than simply gliding. S. sepioidea have previously been considered incapable of flight, due to their large body size. Maciá et al. (2004) also review previous accounts of flying behaviour in other squid species. They note several instances of flying behaviour in squid and indicate that S. sepioidea can indeed fly up to 50 times their own body length (20-25 cm). They note that this behaviour appears to be more widespread that initially suspected.

Summary: Fleming et al. (2012)

Extensive cytological and molecular changes occur at conception, particularly at the time of ovulation, fertilization and embryonic development. While this progression is generally programmed by intrinsic processes, environmental factors impart important information on the metabolic process, influencing the developmental programme. Fleming et al. (2012) review a variety of mammalian models and suggest that maternal nutrition modifies this developmental process throughout the gestatory period through its mediation of the peri-conceptual environment and that this can affect the physiological and metabolic health of the offspring when they reach adulthood. They indicate that the origin of adult disease risk might be a function of the quality of the mother's nutrition prior to parturition and suggest that more research on the mechanisms are required if preventative strategies for managing disease risk are to be implemented.

Summary: Ackerman et al. (2010)

The first sense to develop is touch, and it is a critical means of manipulating the environment and acquiring information. Physically touching objects allows for the development of both intra- and interpersonal conceptual and metaphorical knowledge and provide the platform for knowledge application. Impressions and decisions formed about strangers and novel situations were nonconsciously influenced when an individual experienced objects of varying weights and textures. Ackerman et al. (2010) found that job candidates appeared more important if they held heavy objects, while social interactions were more challenging when rough objects were held. Furthermore, holding hard objects increased negotiation rigiditiy. They suggest that higher social cognitive processing is influenced by basic tactile sensations in both metaphor- and dimension-specific ways.