RISK-TAKING BY THREESPINE STICKLEBACK (GASTEROSTEUS ACULEATUS) PELVIC PHENOTYPES: DOES MORPHOLOGY PREDICT BEHAVIOUR?

Behaviour ◽  
2000 ◽  
Vol 137 (7-8) ◽  
pp. 889-906 ◽  
Author(s):  
Tamara Grand
Keyword(s):  
British Columbia ◽  
Life History ◽  
Risk Taking ◽  
Gasterosteus Aculeatus ◽  
Positive Relationship ◽  
Threespine Stickleback ◽  
Risk Exposure ◽  
The Relationship ◽  
Lateral Plates

AbstractThe relationship between risk-taking behaviour and anti-predator morphology was studied in benthic threespine stickleback fish (Gasterosteus aculeatus) from Paxton and Priest Lakes on Texada Island, British Columbia, Canada. In general, Priest Lake benthics possess complete pelvic girdles and numerous lateral plates. In contrast, Paxton Lake benthics exhibit an apparent polymorphism in anti-predator morphology; some individuals possess complete pelvic girdles while others lack them entirely. Although phenotypes tended to differ in their willingness to risk exposure to a trout predator while foraging, the predicted positive relationship between risk-taking behaviour and anti-predator morphology was not observed. While 'girdled' Paxton individuals were more willing to forage in the vicinity of the predator than 'girdleless' Paxton individuals, the more heavily armoured Priest fish were intermediate in their risk-taking behaviour. These results suggest that the relationship between risktaking behaviour and anti-predator morphology may be influenced by differences between phenotypes in predation regime and life history.

Phenotypic Variation in Threespine Sticklebacks (Gasterosteus aculeatus) of the Chignik River System, Alaska

1969 ◽  
Vol 26 (2) ◽  
pp. 405-412 ◽  
Author(s):  
David W. Narver
Keyword(s):  
Life History ◽  
Phenotypic Variation ◽  
Gasterosteus Aculeatus ◽  
River System ◽  
Threespine Stickleback ◽  
Caudal Peduncle ◽  
Threespine Sticklebacks ◽  
History Of ◽  
Lateral Plates

Four phenotypes of the threespine stickleback, Gasterosteus aculeatus Linnaeus, were identified from the two Chignik lakes, Alaska: unplated (2–6 anterior plates); half-plated (7–15 anterior plates); fully plated (18–22 plates) lacustrine; and fully plated (18–22) estuarine. Distinctions lie in number and size of lateral plates and extent of lateral keel development on the caudal peduncle. Composition of the three lacustrine phenotypes in either lake population was similar among the years 1962–64 for both age I and age II in Black Lake but dissimilar in Chignik Lake. The Black Lake population contained a higher proportion of the unplated and half-plated phenotypes but fewer of the fully plated phenotypes than the Chignik Lake population. The life history of the estuarine phenotype is outlined. The mechanisms responsible for the maintenance of the four phenotypes in the Chignik River system have not been determined.

scholarly journals Risk-Taking Behavior and the Consumption of Alcohol Mixed with Energy Drink among Australian, Dutch and UK Students

2021 ◽  
Vol 18 (10) ◽  
pp. 5315
Author(s):  
Sean J. Johnson ◽  
Sarah Benson ◽  
Andrew Scholey ◽  
Chris Alford ◽  
Joris C. Verster
Keyword(s):  
Alcohol Consumption ◽  
The Netherlands ◽  
Risk Taking ◽  
Positive Relationship ◽  
Energy Drinks ◽  
Energy Drink ◽  
Energy Drink Consumption ◽  
Risk Taking Behavior ◽  
The Relationship ◽  
Level Of Risk

The relationship between risk-taking behavior, alcohol consumption and negative alcohol-related consequences is well known. The current analyses were conducted to investigate whether alcohol mixed with energy drink (AMED) is related to risk-taking behavior and if there is a relationship between the amount of energy drink mixed with alcohol consumed, risk-taking behavior and negative alcohol-related consequences. Data from N = 1276 AMED consuming students from the Netherlands, UK and Australia who completed the same survey were evaluated. The analysis revealed that, compared to AMED occasions, on alcohol only (AO) occasions significantly more alcohol was consumed and significantly more negative alcohol-related consequences were reported. On both AO and AMED occasions, there was a strong and positive relationship between amount of alcohol consumed, level of risk-taking behavior and number of reported negative alcohol-related consequences. In contrast, the level of risk-taking behavior was not clearly related to energy drink consumption. Across risk-taking levels, differences in the amount of energy drink consumed on AMED occasions did not exceed one 250 mL serving of energy drink. When correcting for the amount of alcohol consumed, there were no statistically significant differences in the number of energy drinks consumed on AMED occasions between the risk-taking groups. In conclusion, alcohol consumption is clearly related to risk-taking behavior and experiencing negative alcohol-related consequences. In contrast, energy drink intake was not related to level of risk-taking behavior and only weakly related to the number of experienced negative alcohol-related consequences.

scholarly journals Metabolic depression and the evolution of hypoxia tolerance in threespine stickleback, Gasterosteus aculeatus

2017 ◽  
Vol 13 (11) ◽  
pp. 20170392 ◽  
Author(s):  
Matthew D. Regan ◽  
Ivan S. Gill ◽  
Jeffrey G. Richards
Keyword(s):  
British Columbia ◽  
Metabolic Rate ◽  
Gasterosteus Aculeatus ◽  
Rapid Evolution ◽  
Agricultural Runoff ◽  
Threespine Stickleback ◽  
Hypoxia Tolerance ◽  
Trout Lake ◽  
Two Populations

Anthropogenic increases in global temperature and agricultural runoff are increasing the prevalence of aquatic hypoxia throughout the world. We investigated the potential for a relatively rapid evolution of hypoxia tolerance using two isolated (for less than 11 000 years) populations of threespine stickleback: one from a lake that experiences long-term hypoxia (Alta Lake, British Columbia) and one from a lake that does not (Trout Lake, British Columbia). Loss-of-equilibrium (LOE) experiments revealed that the Alta Lake stickleback were significantly more tolerant of hypoxia than the Trout Lake stickleback, and calorimetry experiments revealed that the enhanced tolerance of Alta Lake stickleback may be associated with their ability to depress metabolic rate (as indicated by metabolic heat production) by 33% in hypoxia. The two populations showed little variation in their capacities for O 2 extraction and anaerobic metabolism. These results reveal that intraspecific variation in hypoxia tolerance can develop over relatively short geological timescales, as can metabolic rate depression, a complex biochemical response that may be favoured in long-term hypoxic environments.

Differences in male courtship in freshwater and marine sticklebacks (Gasterosteus aculeatus)

1983 ◽  
Vol 61 (2) ◽  
pp. 292-297 ◽  
Author(s):  
J. D. McPhail ◽  
D. E. Hay
Keyword(s):  
British Columbia ◽  
Assortative Mating ◽  
Gasterosteus Aculeatus ◽  
Threespine Stickleback ◽  
Male Courtship ◽  
First Response ◽  
Positive Assortative Mating ◽  
First Contact

Earlier studies indicated that the freshwater and marine forms of threespine stickleback (Gasterosteus aculeatus) in the Little Campbell River are genetically differentiated and that they do not mate randomly. In this study, we examine the possible contribution of male courtship to this positive assortative mating. Marine and freshwater sticklebacks were obtained from the Little Campbell River, southwestern British Columbia. Males were allowed to build nests in large aquaria and court females. The following courtship behaviours were recorded: zigzag bouts per minute, bites per minute, fanning bouts per minute, glueing, creeping through, and the male's first response. Freshwater males zigzag more, bite less, and glue more than marine males. The intensity of courtship in freshwater males depends on the form of female courted, whereas marine males do not alter their courtship with different forms of females. Freshwater males typically zigzag on first contact with a female, and marine males usually bite. This difference in male first response is independent of the type of female courted. Differences in male courtship provide a basis for positive assortative mating between the two forms of sticklebacks. We argue that selection should favour a male first response that signals genotype.

scholarly journals Role of Managerial Competencies and Risk-Taking Behavior in Financial Service Outreach of Microfinance Banks in Pakistan

2019 ◽  
Vol 15 (2) ◽  
pp. 25-42
Author(s):  
Fozia Taj ◽  
Keyword(s):  
Risk Taking ◽  
Positive Relationship ◽  
Financial Service ◽  
Primary Data ◽  
Managerial Competencies ◽  
Managerial Risk ◽  
Calculated Risk ◽  
Risk Taking Behavior ◽  
The Relationship

This study aims to investigate the relationship between the managerial risk-taking, managerial competencies and financial service outreach of microfinance banks in Pakistan. Primary data was collected from 36 branches of microfinance banks (MFBs) in nine cities. The unit of investigation is the branch manager and senior credit officer of each MFB branch. Descriptive statistics, correlation and regression, are used for data analysis. This study found a positive relationship between financial service outreach of MFBs and managerial competencies; financial service outreach also has a positive relationship with the risk-taking behavior of managers. There is a positive relationship between risk-taking behavior and financial service outreach of banks. The risk-taking behavior partially mediates the relationship between the managerial competencies and financial service outreach. The magnitude of the relationship between managerial competencies and outreach is significant, and its magnitude reduces when there is the mediation of managerial risk-taking behavior between them. Thus, managerial competencies, along with risk-taking behavior are the keys drivers of financial service outreach of MFBs. This study informs MFB’s top management and policymakers that competencies of managers and their calculated risk-taking propensities determined outreach performance of the MFBs.

Spatial, sexual, and rapid temporal differentiation in neuromast expression on lateral plates of Haida Gwaii threespine stickleback (Gasterosteus aculeatus)

2019 ◽  
Vol 97 (11) ◽  
pp. 988-996 ◽  
Author(s):  
N.P. Planidin ◽  
T.E. Reimchen
Keyword(s):  
Gasterosteus Aculeatus ◽  
Sensory Modality ◽  
Threespine Stickleback ◽  
Predatory Fish ◽  
Limited Attention ◽  
Sexually Dimorphic ◽  
Haida Gwaii ◽  
Temporal Differentiation ◽  
Lateral Lines ◽  
Lateral Plates

Lateral lines, a major sensory modality in fishes, are diverse among taxa, but their intraspecific variation has received limited attention. We examined numbers of superficial neuromasts on the buttressing lateral plates (LP) of 1910 threespine stickleback (Gasterosteus aculeatus Linnaeus, 1758) from 26 ecologically and morphologically diverse populations on the Haida Gwaii archipelago, western Canada. Extending from previous studies, we predicted that (i) highly stained dystrophic localities would have threespine stickleback with elevated numbers of neuromasts per plate due to a greater reliance on non-visual sensory modalities and (ii) that LP count and neuromast numbers per plate would functionally covary with predatory assemblage. We found that there were no differences in neuromast count across major habitats (marine, lake, stream), but clear-water populations and those with predatory fish had significantly more neuromasts per plate than most populations in highly stained dystrophic lakes, the effects being accentuated on the first buttressing plate (LP4). We also report the first evidence that neuromast counts per plate are sexually dimorphic, with males having a greater density of neuromasts in most populations. Two transplant experiments between ecologically opposite habitats indicate that within 12 generations, neuromast counts per plate can rapidly shift in response to a change in habitat.

scholarly journals Research on the Impact of Financing Liquidity on Risk-taking of Commercial Banks

2019 ◽  
Vol 267 ◽  
pp. 04012
Author(s):  
Yumeng Bu
Keyword(s):  
Risk Taking ◽  
Financial Crises ◽  
Commercial Banks ◽  
Mutual Influence ◽  
Risk Exposure ◽  
External Financing ◽  
Internal Financing ◽  
The Impact ◽  
The Relationship ◽  
Bank Risks

Insufficient liquidity and maturity mismatches lead to bank risks and financial crises. After Basel III included the net stable funding ratio into regulatory indicators, the relationship between the liquidity indicators represented by the net stable capital ratio and the bank's risk exposure triggered discussions among domestic and foreign scholars. This paper uses the data of China's commercial banks, mainly discussing the mutual influence of internal financing liquidity and external financing liquidity on the risk exposure of banks, and then putting forward some suggestions on how to reduce bank risks through financing liquidity.

scholarly journals The Relationship between Organizational Learning Capability and Job Satisfaction

2012 ◽  
Vol 2 (1) ◽  
pp. 15
Author(s):  
Seyyed Yaser Ebrahimian Jolodar ◽  
Seyyed Rohollah Ebrahimian Jolodar
Keyword(s):  
Job Satisfaction ◽  
Decision Making ◽  
Organizational Learning ◽  
Risk Taking ◽  
Positive Relationship ◽  
Pearson Correlation ◽  
External Environment ◽  
Learning Capability ◽  
Sample Number ◽  
The Relationship

The effectiveness and productivity of an organization depends on its staff and if they don’t be satisfied from their job, continues of living for such organization is impossible. One of the important factors which influence on job satisfaction, is an organizational learning capability (OLC). So, the purpose of this paper is to analyze the relationship between organizational learning capability and its dimensions (experimentation, risk taking, interaction with the external environment, dialogue and participative decision making) with job satisfaction. The population of this study was the employees of Tejarat Bank in Sari city, Iran and the sample number became 103. The data of job satisfaction gathered by a single item of Chiva and Alegre’s (2008(questionnaire and for gathering the data of organizational learning capability, we used Chiva et al.’s (2007) OLC measurement instrument. For testing and analyzing the hypotheses, pearson correlation coefficient and multiple regression have been used.   The results of study show that there is a positive relationship between organizational learning capability with job satisfaction. Furthermore, the results revealed the five dimensions of organizational learning capability (experimentation, risk taking, interaction with the external environment, dialogue and participative decision making) had positive relationship with job satisfaction.   Keywords: Organizational learning capability, Job satisfaction, Staff  

Meristic variation in the threespine stickleback, Gasterosteus aculeatus L., in eastern Canadian waters

1973 ◽  
Vol 51 (5) ◽  
pp. 547-551 ◽  
Author(s):  
E. T. Garside ◽  
T. Hamor
Keyword(s):  
Nova Scotia ◽  
North America ◽  
Species Complex ◽  
Vertebral Column ◽  
Gasterosteus Aculeatus ◽  
Lake Ontario ◽  
Threespine Stickleback ◽  
Meristic Variation ◽  
La Madeleine ◽  
Lateral Plates

Samples of threespine stickleback, Gasterosteus aculeatus L., collected from several areas of Newfoundland and Nova Scotia, and single sites from Iles de la Madeleine, Quebec, and eastern Lake Ontario, were analyzed for variation in numbers of anterior lateral plates and vertebrae. Counts of vertebrae varied from 28 to 35 and mean counts from 30.3 to 33.4, without being related to any obvious geographic gradients. Trunk and caudal segments of the vertebral column had about the same degree of variation. Counts of lateral plates exclusive of ossicles of the caudal keel ranged from 0 to 31 with a range of means from 1.6 to 24.7. Incomplete development of potential plate number and absence of caudal keels were observed in 1st-year individuals. These results are discussed in relation to information about this species complex from populations of Pacific North America and Europe.

Sign in / Sign up

Export Citation Format

Share Document