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Female promiscuity promotes the evolution of faster sperm in cichlid fishes
- J. Fitzpatrick, R. Montgomerie, J. K. Desjardins, K. Stiver, N. Kolm, S. Balshine
- BiologyProceedings of the National Academy of Sciences
- 27 January 2009
It is shown that sperm competition selects for increases in the number, size, and longevity of spermatozoa in the ejaculate of a male, and, contrary to expectations from theory, there is no evidence of trade-offs among sperm traits in an interspecific analysis.
Dispersal patterns and status change in a co‐operatively breeding cichlid Neolamprologus pulcher: evidence from microsatellite analyses and behavioural observations
Results demonstrate that important and difficult to obtain life-history information can be obtained from genetic sampling in Neolamprologus pulcher.
Female-mediated causes and consequences of status change in a social fish
- J. Fitzpatrick, J. K. Desjardins, N. Milligan, K. Stiver, R. Montgomerie, S. Balshine
- BiologyProceedings of the Royal Society B: Biological…
- 22 April 2008
This study examined male reproductive anatomy, physiology and behaviour following experimental manipulations of social status in the cooperatively breeding cichlid fish, Neolamprologus pulcher, and highlighted the complex interactions between social status, reproductive physiology and group dynamics.
Relatedness and helping in fish: examining the theoretical predictions
- K. Stiver, P. Dierkes, M. Taborsky, H. Lisle Gibbs, S. Balshine
- PsychologyProceedings of the Royal Society B: Biological…
- 7 August 2005
This work demonstrates that a number of factors in addition to kinship shape cooperative investment patterns and found that the degree of work effort by helpers depended on which helping behaviours were considered and on their level of relatedness to the breeding male or female.
Ovarian fluid allows directional cryptic female choice despite external fertilization
Using an in vitro sperm competition experiment, it is demonstrated that female ovarian fluid (ovarian fluid) changes the outcome of sperm competition by decreasing the importance of sperm number thereby increasing the relative importance of semen velocity.
Parental and Mating Effort: Is There Necessarily a Trade‐Off?
The empirical evidence for trade-offs between mating and parental effort in males and females is examined and the importance of considering individual variation is highlighted, and how preferences in one sex may influence the existence and the interpretation of apparent trade-off in the other sex is explored.
Differential responses to territory intrusions in cooperatively breeding fish
Sex and status in a cooperative breeding fish: behavior and androgens
- J. K. Desjardins, K. Stiver, J. Fitzpatrick, N. Milligan, G. Kraak, S. Balshine
- BiologyBehavioral Ecology and Sociobiology
- 1 March 2008
It is found that dominant male breeders provided a similar amount of care as did the subordinate helpers, but breeding males had the highest levels of 11-ketotestosterone, an important androgen in fish.
Sex differences in rates of territory joining and inheritance in a cooperatively breeding cichlid fish
Liver size reveals social status in the African cichlid Neolamprologus pulcher.
- N. Sopinka, J. Fitzpatrick, J. K. Desjardins, K. Stiver, S. Marsh-Rollo, S. Balshine
- Environmental ScienceJournal of fish biology
- 1 July 2009
Wild groups of the cooperatively breeding Lake Tanganyika cichlid, Neolamprologus pulcher, were used to investigate how social status and sex influence liver investment and it is suggested that liver investment patterns were linked to status-driven differences in energy expenditure but not to energy intake or storage.