Mechanisms regulating caste differentiation in an aphid social system

Shibao, Harunobu; Kutsukake, Mayako; Matsuyama, Shigeru; Fukatsu, Takema; Shimada, Muneaki

doi:10.4161/cib.3.1.9694

Cited by 48 publications

(48 citation statements)

References 50 publications

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“…The across-context observation of this effect suggests that quality-assortative or ‘prudent choice’ [11] is a mating tactic not only predicted by theory (for discussion see [62]) but now also demonstrated experimentally. The asymmetry in mating tactics confirms that female preferences might drive much of males' courting effort and eventual choice (for review see [19]).…”

Section: Discussionmentioning

confidence: 95%

An Experimental Test of Condition-Dependent Male and Female Mate Choice in Zebra Finches

2011

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In mating systems with social monogamy and obligatory bi-parental care, such as found in many songbird species, male and female fitness depends on the combined parental investment. Hence, both sexes should gain from choosing mates in high rather than low condition. However, theory also predicts that an individual's phenotypic quality can constrain choice, if low condition individuals cannot afford prolonged search efforts and/or face higher risk of rejection. In systems with mutual mate choice, the interaction between male and female condition should thus be a better predictor of choice than either factor in isolation. To address this prediction experimentally, we manipulated male and female condition and subsequently tested male and female mating preferences in zebra finches Taeniopygia guttata, a songbird species with mutual mate choice and obligatory bi-parental care. We experimentally altered phenotypic quality by manipulating the brood size in which the birds were reared. Patterns of association for high- or low-condition individuals of the opposite sex differed for male and female focal birds when tested in an 8-way choice arena. Females showed repeatable condition-assortative preferences for males matching their own rearing background. Male preferences were also repeatable, but not predicted by their own or females' rearing background. In combination with a brief review of the literature on condition-dependent mate choice in the zebra finch we discuss whether the observed sex differences and between-studies differences arise because males and females differ in context sensitivity (e.g. male-male competition suppressing male mating preferences), sampling strategies or susceptibility to rearing conditions (e.g. sex-specific effect on physiology). While a picture emerges that juvenile and current state indeed affect preferences, the development and context-dependency of mutual state-dependent mate choice warrants further study.

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Section: Discussionmentioning

confidence: 95%

An Experimental Test of Condition-Dependent Male and Female Mate Choice in Zebra Finches

2011

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“…Using this computer-controlled device [16], [35], the dummy wasp could be moved at variable velocities (0.1 - 0.5 m/s) and directions (Fig.3A). The dummy consisted of Styrofoam (L×W×H: 40×15×15 mm) with white, yellow and black painted stripes.…”

Section: Methodsmentioning

confidence: 99%

How to Join a Wave: Decision-Making Processes in Shimmering Behavior of Giant Honeybees (Apis dorsata)

et al. 2012

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Shimmering is a collective defence behaviour in Giant honeybees (Apis dorsata) whereby individual bees flip their abdomen upwards, producing Mexican wave-like patterns on the nest surface. Bucket bridging has been used to explain the spread of information in a chain of members including three testable concepts: first, linearity assumes that individual “agent bees” that participate in the wave will be affected preferentially from the side of wave origin. The directed-trigger hypothesis addresses the coincidence of the individual property of trigger direction with the collective property of wave direction. Second, continuity describes the transfer of information without being stopped, delayed or re-routed. The active-neighbours hypothesis assumes coincidence between the direction of the majority of shimmering-active neighbours and the trigger direction of the agents. Third, the graduality hypothesis refers to the interaction between an agent and her active neighbours, assuming a proportional relationship in the strength of abdomen flipping of the agent and her previously active neighbours. Shimmering waves provoked by dummy wasps were recorded with high-resolution video cameras. Individual bees were identified by 3D-image analysis, and their strength of abdominal flipping was assessed by pixel-based luminance changes in sequential frames. For each agent, the directedness of wave propagation was based on wave direction, trigger direction, and the direction of the majority of shimmering-active neighbours. The data supported the bucket bridging hypothesis, but only for a small proportion of agents: linearity was confirmed for 2.5%, continuity for 11.3% and graduality for 0.4% of surface bees (but in 2.6% of those agents with high wave-strength levels). The complimentary part of 90% of surface bees did not conform to bucket bridging. This fuzziness is discussed in terms of self-organisation and evolutionary adaptedness in Giant honeybee colonies to respond to rapidly changing threats such as predatory wasps scanning in front of the nest.

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“…Pregnant Sprague-Dawley rats were purchased from Harlan Laboratories (Indianapolis, IN). Rat hippocampal neuron cultures were prepared from hippocampi dissected from postnatal day 1 (PN1) rats as described previously [21–23]. Briefly, rat hippocampi were dissected out of PN1 rats, and cells were dissociated enzymatically and mechanically (trituration through Pasteur pipette) in a Papain solution (12 U/ml; Worthington, Freehold, NJ) containing Leibovitz’s L-15 medium (Invitrogen), 0.42 mg/ml cysteine (Sigma), 250U/ml DNase 1 (type IV; Sigma), 25 mM NaHCO 3 , penicillin (50 U/ml)/streptomycin (50 μg/ml), 1 mM sodium pyruvate, and 1 mg/ml glucose (Invitrogen).…”

Section: Methodsmentioning

confidence: 99%

Voltage-gated calcium channels are not affected by the novel anti-epileptic drug lacosamide

Wang¹,

Khanna²

2011

Translational Neuroscience

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The novel anti-epileptic drug lacosamide targets two proteins – voltage-gated sodium channels and collapsin response mediator protein 2 (CRMP-2) – suggesting dual modes of action for lacosamide. We recently identified the neurite outgrowth and axonal guidance protein CRMP-2 as a novel partner and regulator of the presynaptic N-type voltage-gated Ca2+ channel (CaV2.2) [Brittain et al., J. Biol. Chem. 284: 31375–31390 (2009)]. Here we examined the effects of lacosamide on voltage-gated Ba2+ channels. Lacosamide did not affect Ba2+ currents via N- and P/Q- channels in rat hippocampal neurons or L-type Ca2+ channels in a mouse CNS neuronal cell line, respectively. N-type Ba2+ currents, augmented by CRMP-2 expression, were also unaffected by acute or chronic lacosamide exposure. These results establish that the anti-epileptic mode of action of lacosamide does not involve these voltage-gated Ca2+ channels.

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Mechanisms regulating caste differentiation in an aphid social system

Cited by 48 publications

References 50 publications

An Experimental Test of Condition-Dependent Male and Female Mate Choice in Zebra Finches

An Experimental Test of Condition-Dependent Male and Female Mate Choice in Zebra Finches

How to Join a Wave: Decision-Making Processes in Shimmering Behavior of Giant Honeybees (Apis dorsata)

Voltage-gated calcium channels are not affected by the novel anti-epileptic drug lacosamide

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