scholarly journals Heterochrony in fringeheads (Neoclinus) and amplification of an extraordinary aggressive display in the Sarcastic Fringehead (Teleostei: Blenniiformes)

2018 ◽  
Vol 279 (5) ◽  
pp. 626-635 ◽  
Author(s):  
Watcharapong Hongjamrassilp ◽  
Adam P. Summers ◽  
Philip A. Hastings
Keyword(s):  
Aggressive Display

A certain note on the wrestling behavior of Haemadipsa picta leeches

2019 ◽  
Vol 66 (1-2) ◽  
pp. 91-93
Author(s):  
Maja Peryga ◽  
Krzysztof Miler
Keyword(s):  
Behavioral Pattern ◽  
Aggressive Display ◽  
Limited Knowledge ◽  
Malaysian Borneo

Abstract Some terrestrial leeches mate by entwining the anterior ends of their bodies and then copulating. Here, we report first observations of a similar behavioral pattern in Haemadipsa picta terrestrial leeches from Malaysian Borneo. However, because the observed pattern can be easily induced artificially with no clear evidence of copulation, we suggest that it may serve another function, particularly in H. picta. We hypothesize that the wrestling behavior, as we term it, may be a ritualized aggressive display driven by competition for ambush location. Haemadipsid fauna of the region is poorly studied, therefore our observations extend limited knowledge about these leeches and open interesting research avenues for the study of the wrestling behavior.

Effects of Mercury Chloride (HgCl2) on Betta Splendens Aggressive Display

2012 ◽  
Vol 15 (1) ◽  
pp. 442-450 ◽  
Author(s):  
Bruno de Matos Mansur ◽  
Caio Neno Silva Cavalcante ◽  
Bruno Rodrigues dos Santos ◽  
Amauri Gouveia
Keyword(s):  
Reproductive Behavior ◽  
Acute Treatment ◽  
Mirror Image ◽  
Betta Splendens ◽  
Aggressive Display ◽  
Control Treatment ◽  
Mercury Chloride ◽  
Progressive Group ◽  
Image Test ◽  
Motor Display

Mercury chloride (HgCl2) is a toxic mercury salt and a major pollutant, that can be found in soil, water and air, with influences on behavior, physiology and adaptation to the environment. In this study two experiments were designed to examine interactions and effects of HgCl2 on some behavioral patterns of Siamese fighting fish (Betta splendens). In the first experiment we tested the effect of a progressive dose (five 0.04 mg) on aggressive display with exposure to a mirror, whereas in the second experiment we tested the effect of an acute dose (0.2 mg) on the aggressive display with exposure to a mirror. The experiments were performed on 5 consecutive sessions at intervals of 18 hours between sessions. Differences of performance were shown by subjects in the acute and progressive treatments when compared with a control treatment in the majority of behaviors evaluated, namely Floating, Slow Swimming, Wavy Swimming, Emerging, Bend, Square Move and Motor Display Components. Acute treatment was different from control only on Show Body, while the progressive group differed on Resting, Horizontal Display and Appropriate Display Components. Differences between Correlate Display Components and Total were also shown. Both the acute and progressive contamination with HgCl2 decrease the motor activity in the aggressive display, mirror-image test of Betta splendens, mainly on the progressive dose. This implies an impairment on feeding behavior, predator avoidance, reproductive behavior, mate choice and territoriality. These results suggest that in this fish species, the progressive dose has a greater effect on behavior in general and that both the acute and progressive contamination with mercury chloride affect many other aspects of behavior.

scholarly journals Effects of Trophic Poisoning with Methylmercury on the Appetitive Elements of the Agonistic Sequence in Fighting-Fish (Betta Splendens)

2007 ◽  
Vol 10 (2) ◽  
pp. 436-448 ◽  
Author(s):  
Amauri Gouveia ◽  
Caio Maximino de Oliveira ◽  
Cynthia Ferreira Romão ◽  
Thiago Marques de Brito ◽  
Dora Fix Ventura
Keyword(s):  
Acute Poisoning ◽  
Betta Splendens ◽  
Pronounced Effect ◽  
Behavioral Effects ◽  
Aggressive Display ◽  
Dependent Effect ◽  
Total Frequency ◽  
Chronic Poisoning ◽  
Amino Oxidase

The aggressive display in Betta splendens is particularly prominent, and vital to its adaptation to the environment. Methylmercury is an organic variation of Hg that presents particularly pronounced neuro-behavioral effects. The present experiments aim to test the effect of acute and chronic poisoning with methylmercury on the display in Bettas. The animals were poisoned by trophic means in both experiments (16 ug/kg in acute poisoning; 16 ug/kg/day for chronic poisoning), and tested in agonistic pairs. The total frequency of the display was recorded, analyzing the topography of the agonistic response. The methylmercury seems to present a dose- and detoxification-dependent effect on these responses, with a more pronounced effect on motivity in acute poisoning and on emotionality in the chronic poisoning. It is possible that this effect could be mediated by alteration in the mono-amino-oxidase systems.

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