Issues

Summary: Capital- and income-breeding strategies can be applied to males, but factors shaping these strategies are different from those found in females.

Summary: Fat reserves in birds accumulated prior to migration are optimised as a function of expected energy expenditure during migration, defined by an interplay between journey length and the energy efficiency of the flight apparatus (e.g. wing aspect ratio, flight type).

Highlighted Article: The optimal transition from horizontal to vertical appears to be determined largely by a trade-off of positive and negative leg work that accomplishes the task with minimum overall work.

Summary: Characterization of the day and night transcriptome of the adult zebrafish retina reveals novel circadian transcripts.

Summary: Evidence suggests that cephalopods possess a sleep-like state that resembles behaviorally the vertebrate rapid eye movement sleep (REMS)-like state.

Summary: Comparing worker and queen bumblebees reveals how body size impacts flight energetics and muscle metabolism.

Summary: A new model for estimating sex ratios from temperature traces for species with temperature-dependent sex determination.

Editors' Choice: A new way to test animal colour vision based on methods to determine whether humans are ‘colour blind’, and a demonstration of how this method works with triggerfish.

Summary: Thermoregulation plays a fundamental, up to now neglected, role in the relationship of endangered affiliated mussels and their fish hosts.

Summary: Like humans/other animals, insects also suffer age-related declines. Older insects are more susceptible to injuries and less able to repair them than younger counterparts.

Summary: Exposing mature scleractinian corals to predicted next-century temperature and pH did not significantly alter parent or offspring physiology or recruitment success in a recognized coral climate refugium.

Summary: By measuring butterflies' behavioural responses to moving images containing both polarization and intensity contrast, we infer the photoreceptors and early neural circuits involved in motion detection.

Summary: The voltage-gated calcium channel gene cacophony encodes multiple alternatively spliced variants. CRISPR/Cas9 genomic editing precisely eliminated a single cacophony exon in Drosophila, leading to larval crawling defects.