TY - JOUR TI - Behavioural and endocrine responses to non-interactive live and video conspecifics in males of the Siamese fighting fish AU - Alex, Deepa AU - Cardoso, Sara D AU - Ramos, Andreia AU - Gonçalves, David T2 - Current Zoology AB - The physiological mechanisms underlying variation in aggression in fish remain poorly understood. One possibly confounding variable is the lack of standardization in the type of stimuli used to elicit aggression. The presentation of controlled stimuli in videos, a.k.a. video playback, can provide better control of the fight components. However, this technique has produced conflicting results in animal behaviour studies and needs to be carefully validated. For this, a similar response to the video and an equivalent live stimulus needs to be demonstrated. Further, different physiological responses may be triggered by live and video stimuli and it is important to demonstrate that video images elicit appropriate physiological reactions. Here, the behavioural and endocrine response of male Siamese fighting fish Betta splendens to a matched for size conspecific fighting behind a one-way mirror, presented live or through video playback, was compared. The video playback and live stimulus elicited a strong and similar aggressive response by the focal fish, with a fight structure that started with stereotypical threat displays and progressed to overt attacks. Post-fight plasma levels of the androgen 11-ketotestosterone were elevated as compared to controls, regardless of the type of stimuli. Cortisol also increased in response to the video images, as previously described for live fights in this species. These results show that the interactive component of a fight, and its resolution, are not needed to trigger an endocrine response to aggression in this species. The study also demonstrates for the first time in a fish a robust endocrine response to video stimuli and supports the use of this technique for researching aggressive behaviour in B. splendens. DA - 2022/10/08/ PY - 2022 DO - 10.1093/cz/zoac078 DP - Silverchair SP - zoac078 J2 - Current Zoology SN - 2396-9814 UR - https://doi.org/10.1093/cz/zoac078 Y2 - 2022/11/09/06:01:40 ER - TY - JOUR TI - Chromosome-level reference genome of the Siamese fighting fish Betta splendens, a model species for the study of aggression AU - Fan, Guangyi AU - Chan, Judy AU - Ma, Kailong AU - Yang, Binrui AU - Zhang, He AU - Yang, Xianwei AU - Shi, Chengcheng AU - Law, Henry AU - Ren, Zhitao AU - Xu, Qiwu AU - Liu, Qun AU - Wang, Jiahao AU - Chen, Wenbin AU - Shao, Libin AU - Gonçalves, David AU - Ramos, Andreia AU - Cardoso, Sara D AU - Guo, Min AU - Cai, Jing AU - Xu, Xun AU - Wang, Jian AU - Yang, Huanming AU - Liu, Xin AU - Wang, Yitao T2 - GigaScience DA - 2018/07/11/ PY - 2018 DO - 10.1093/gigascience/giy087 LA - en SN - 2047-217X UR - https://academic.oup.com/gigascience/advance-article/doi/10.1093/gigascience/giy087/5054042 Y2 - 2021/02/19/08:48:24 ER - TY - JOUR TI - Neurogenomic mechanisms of social plasticity AU - Cardoso, Sara D. AU - Teles, Magda C. AU - Oliveira, Rui F. T2 - Journal of Experimental Biology AB - Skip to Next Section Group-living animals must adjust the expression of their social behaviour to changes in their social environment and to transitions between life-history stages, and this social plasticity can be seen as an adaptive trait that can be under positive selection when changes in the environment outpace the rate of genetic evolutionary change. Here, we propose a conceptual framework for understanding the neuromolecular mechanisms of social plasticity. According to this framework, social plasticity is achieved by rewiring or by biochemically switching nodes of a neural network underlying social behaviour in response to perceived social information. Therefore, at the molecular level, it depends on the social regulation of gene expression, so that different genomic and epigenetic states of this brain network correspond to different behavioural states, and the switches between states are orchestrated by signalling pathways that interface the social environment and the genotype. Different types of social plasticity can be recognized based on the observed patterns of inter- versus intra-individual occurrence, time scale and reversibility. It is proposed that these different types of social plasticity rely on different proximate mechanisms at the physiological, neural and genomic level. DA - 2015/01/01/ PY - 2015 DO - 10.1242/jeb.106997 DP - jeb.biologists.org VL - 218 IS - 1 SP - 140 EP - 149 LA - en SN - 0022-0949, 1477-9145 UR - https://jeb.biologists.org/content/218/1/140 Y2 - 2021/02/10/10:45:13 ER - TY - JOUR TI - Social network predicts loss of fertilizations in nesting males of a fish with alternative reproductive tactics AU - Cardoso, Sara D. AU - Faustino, Ana I. AU - Costa, Silvia S. AU - Valério, Fábio AU - Gonçalves, David AU - Oliveira, Rui F. T2 - acta ethologica AB - Alternative reproductive tactics (ARTs) evolve when there is strong intra-sexual competition between conspecifics for access to mates. Typically, larger “bourgeois” males reproduce by securing the access to reproductive resources while smaller “parasitic” males reproduce by stealing fertilizations from larger males. A number of factors can influence the reproductive success of each tactic, including intrinsic (e.g. size) and extrinsic (e.g. tactic relative frequency) variables. An example where plastic ARTs occur is the peacock blenny Salaria pavo, with large males reproducing by defending nests and attracting females (bourgeois tactic) and small males reproducing by achieving sneaked fertilizations (parasitic tactic). In this study, we conducted field observations on individually tagged animals to determine their social network and collected eggs from 11 nests to determine the fertilization success of each male tactic. Paternity estimates for 550 offspring indicated an average fertilization success for nest-holder males of 95%. Nest-holder male morphological traits and social network parameters were tested as predictors of fertilization success, but only the number of sneakers present in the nest-holder’s social networks was found to be a predictor of paternity loss. Although male morphological traits had been previously found to be strongly correlated with reproductive success of nest-holder males, as measured by the number of eggs collected in the male’s nest, no correlation was found between any of the measured morphological traits and fertilization success for these males. The results suggest a stronger influence of the social environment than of morphological variables in the proportion of lost fertilizations by nest-holder males of this species. DA - 2017/02/01/ PY - 2017 DO - 10.1007/s10211-016-0249-9 VL - 20 IS - 1 SP - 59 EP - 68 J2 - acta ethol LA - en SN - 1437-9546 UR - https://doi.org/10.1007/s10211-016-0249-9 Y2 - 2021/02/01/05:08:39 ER - TY - JOUR TI - Temporal variation in brain transcriptome is associated with the expression of female mimicry as a sequen-tial male alternative reproductive tactic in fish. AU - Cardoso, S.D., Gonçalves, D., Goesmann, A., Canário, A.V.M., & Oliveira, R.F. T2 - Molecular Ecology DA - 2017/// PY - 2017 DO - : 10.1111/mec.14408 ER -