Social cues in the expression of sequential alternative reproductive tactics in young males of the peacock blenny, Salaria pavo

Fagundes, Teresa; Simões, Mário; Gonçalves, David; Oliveira, Rui Filipe

doi:10.1016/j.physbeh.2012.07.011

Cited by 5 publications

(3 citation statements)

References 52 publications

(63 reference statements)

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“…One possible explanation is that in dominant male rats, where androgen levels in the serum are high ((Lucion et al, 1996; Clarke & Faulkes, 1998; Lofgren et al, 2013) see also (Albert et al, 1986)), behavioral plasticity may be less important than it is for the subordinant male, where serum levels of androgen are substantially lower, and animals need to modify behavior to safely obtain food and water. Indeed, in some species of birds the males with higher testosterone levels breed normally but the males with lower testosterone levels develop alternative reproductive behavior (Fagundes et al, 2012). …”

Section: Dominant Gcs Mossy Fiber Variance and Their Implicationsmentioning

confidence: 99%

Corruption of the dentate gyrus by “dominant” granule cells: Implications for dentate gyrus function in health and disease

Scharfman

Myers

2016

Neurobiology of Learning and Memory

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The dentate gyrus (DG) and area CA3 of the hippocampus are highly organized lamellar structures which have been implicated in specific cognitive functions such as pattern separation and pattern completion. Here we describe how the anatomical organization and physiology of the DG and CA3 are consistent with structures that perform pattern separation and completion. We then raise a new idea related to the complex circuitry of the DG and CA3 where CA3 pyramidal cell ‘backprojections’ play a potentially important role in the sparse firing of granule cells (GCs), considered important in pattern separation. We also propose that GC axons, the mossy fibers, already known for their highly specialized structure, have a dynamic function that imparts variance – ‘mossy fiber variance’ – which is important to pattern separation and completion. Computational modeling is used to show that when a subset of GCs become ‘dominant,’ one consequence is loss of variance in the activity of mossy fiber axons and a reduction in pattern separation and completion in the model. Empirical data are then provided using an example of ‘dominant’ GCs – subsets of GCs that develop abnormally and have increased excitability. Notably, these abnormal GCs have been identified in animal models of disease where DG-dependent behaviors are impaired. Together these data provide insight into pattern separation and completion, and suggest that behavioral impairment could arise from dominance of a subset of GCs in the DG-CA3 network.

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Section: Dominant Gcs Mossy Fiber Variance and Their Implicationsmentioning

confidence: 99%

Corruption of the dentate gyrus by “dominant” granule cells: Implications for dentate gyrus function in health and disease

Scharfman

Myers

2016

Neurobiology of Learning and Memory

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“…In some such species, the choice between becoming a “traditional” male and a “sneaker” male appears to be influenced by the social environment [20]. In the peacock blenny ( Salaria pavo ), the outcomes of agonistic interactions among juvenile males are predictive of the decision to become a territory-holding or sneaker male [21]. …”

Section: Continuing Factorsmentioning

confidence: 99%

Timing reproduction in teleost fish: cues and mechanisms

Juntti

Fernald

2016

Current Opinion in Neurobiology

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Fish comprise half of extant vertebrate species and use a rich variety of reproductive strategies that have yielded insights into the basic mechanisms that evolved for sex. To maximize the chances of fertilization and survival of offspring, fish species time reproduction to occur at optimal times. For years, ethologists have performed painstaking experiments to identify sensory inputs and behavioral outputs of the brain during mating. Here we review known mechanisms that generate sexual behavior, focusing on the factors that govern the timing of these displays. The development of new technologies, including high-throughput sequencing and genome engineering, have the potential to provide novel insights into how the vertebrate brain consummates mating at the appropriate time.

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“…However, Fagundes et al . () demonstrated that the differentiation of the secondary characters typical of nest‐holder males is dependent on the dominance status of the juveniles and their relative body size within a social group, rather than on the absolute body size of males. Accordingly, in the present study, body size is shown to differ between males following the different pathways, but this difference is better explained when considering year variation, thus suggesting that pathways are best described by their relative differences in body size rather than by fixed absolute body size values.…”

Section: Discussionmentioning

confidence: 99%

Birth date predicts alternative life‐history pathways in a fish with sequential reproductive tactics

Fagundes¹,

Simões²,

Saraiva

et al. 2015

Functional Ecology

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Summary In species with plastic expression of alternative reproductive tactics (ARTs), individuals of the same sex, usually males, can adopt different reproductive tactics depending on factors such as body size. The ‘birth date hypothesis’ proposes that condition‐dependent expression of ARTs may ultimately depend on birth date, because individuals born at different times of the year may achieve different sizes and express different reproductive tactics accordingly. However, this has rarely been tested. Here, we tested this hypothesis in a fish with ARTs, the peacock blenny (Salaria pavo). A long‐term (6 years) mark–recapture study demonstrated that ARTs in the peacock blenny were sequential and that males may follow at least two alternative life‐history pathways: a nest‐holder pathway, in which males express the nest‐holder tactic from their first breeding season onwards, and a parasitic pathway, where males reproduce on their first breeding season as sneaker males and subsequently as nest‐holders. We have found evidence of a birth date effect on the expression of ARTs in the peacock blenny. Males following the nest‐holder pathway are born earlier and are larger at the first breeding season than males following the parasitic pathway, but they have similar growth curves. The mechanisms underlying a birth date effect are far from clear and might be diverse. We have not found support for a mechanism of body size threshold triggering sexual maturation and subsequent ARTs. A mechanism of tactic determination that is strictly based on timing of first maturation is also unlikely. A proxy of lifetime reproductive success shows crossing (body size associated) fitness curves for the two main life‐history pathways.

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Social cues in the expression of sequential alternative reproductive tactics in young males of the peacock blenny, Salaria pavo

Cited by 5 publications

References 52 publications

Corruption of the dentate gyrus by “dominant” granule cells: Implications for dentate gyrus function in health and disease

Corruption of the dentate gyrus by “dominant” granule cells: Implications for dentate gyrus function in health and disease

Timing reproduction in teleost fish: cues and mechanisms

Birth date predicts alternative life‐history pathways in a fish with sequential reproductive tactics

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