The relationship between growth, brain asymmetry and behavioural lateralization in a cichlid fish

2009 ◽  
Vol 201 (1) ◽  
pp. 223-228 ◽  
Author(s):  
Adam R. Reddon ◽  
Cristián Gutiérrez-Ibáñez ◽  
Douglas R. Wylie ◽  
Peter L. Hurd
Keyword(s):  
Cichlid Fish ◽  
Brain Asymmetry ◽  
The Relationship

La radiothyroïdectomie et son effet sur la consommation d'oxygène chez les cichlidés Aequidens latifrons

1971 ◽  
Vol 49 (3) ◽  
pp. 423-425 ◽  
Author(s):  
M.-L. Ruhland
Keyword(s):  
Oxygen Consumption ◽  
Thyroid Gland ◽  
Treatment Period ◽  
Fibrous Tissue ◽  
Thyroid Tissue ◽  
Cichlid Fish ◽  
Thyroid Cells ◽  
Rate Of Oxygen Consumption ◽  
The Relationship ◽  
Thiourea Treatment

The thyroidectomy produced after radioiodide immersion of the cichlid fish Aequidens latifrons during 5 months was characterized by progressive alterations of the thyroid tissue from the disappearance of colloid, the degeneration of thyroid cells until an intensive proliferation of fibrous tissue, which replaced the thyroid follicles of the gland. Autoradiographic examinations revealed a few microfollicles, which presented a small activity.The consequential effects on the respiratory exchanges are significant decreases of the oxygen consumption which are progressive and more important than the decreases obtained after thiourea treatment. The decreases reach a third of the normal rate of oxygen consumption, 32% after a long treatment period (150 days). This proves the relationship between the thyroid gland and the oxygen consumption of fishes.

Breeder-Helper Conflict in a Cichlid Fish With Broodcare Helpers: an Experimental Analysis

Behaviour ◽  
1985 ◽  
Vol 95 (1-2) ◽  
pp. 45-75 ◽  
Author(s):  
Michael Taborsky
Keyword(s):  
Experimental Analysis ◽  
Graphical Model ◽  
Cichlid Fish ◽  
Field Evidence ◽  
The Family ◽  
Cooperatively Breeding ◽  
Common Interests ◽  
Relationship Of ◽  
The Relationship ◽  
Sexually Mature

AbstractThis paper reports an experimental analysis of conflicting interests in the cooperatively breeding Lamprologus brichardi (Cichlidae). Helpers clearly prefer to stay in the family territory rather than leave for an aggregation of same-size young or for an unoccupied area-even when their chances of reproducing independently are superior to those in the field. Helpers usually attain independence when the breeders force them to leave the territory. Breeders' toleration of helpers depends on the stage in the reproductive cycle, the size of helpers and the need for helpers. Large, previously expelled helpers are reaccepted when competition is increased. In these circumstances breeders prefer their own former helpers to strange young. Experimental and field evidence suggests that 3 factors are ultimately important for the breeder/helper relationship: reproductive parasitism by mature helpers, eventual cannibalism on breeders' eggs and competition for shelter within the territory. A graphical model shows how the initially common interests of breeders and helpers develop divergently when helpers reach the size at which they become sexually mature and less susceptible to predation. Large helpers pay to stay. The relationship of breeders and large helpers meets the criterion of reciprocal altruism.

Interstellar gas in the central region of the Galaxy

1967 ◽  
Vol 31 ◽  
pp. 239-251 ◽  
Author(s):  
F. J. Kerr
Keyword(s):  
Central Region ◽  
Galactic Plane ◽  
Neutral Hydrogen ◽  
Continuum Emission ◽  
Galactic Centre ◽  
Interstellar Gas ◽  
Hydrogen Recombination ◽  
The Galaxy ◽  
Centre Region ◽  
The Relationship

A review is given of information on the galactic-centre region obtained from recent observations of the 21-cm line from neutral hydrogen, the 18-cm group of OH lines, a hydrogen recombination line at 6 cm wavelength, and the continuum emission from ionized hydrogen.Both inward and outward motions are important in this region, in addition to rotation. Several types of observation indicate the presence of material in features inclined to the galactic plane. The relationship between the H and OH concentrations is not yet clear, but a rough picture of the central region can be proposed.

The relationship of the scleractinian corals to the rugose corals

Paleobiology ◽  
1980 ◽  
Vol 6 (02) ◽  
pp. 146-160 ◽  
Author(s):  
William A. Oliver
Keyword(s):  
Critical Points ◽  
Scleractinian Corals ◽  
Convincing Evidence ◽  
Early Triassic ◽  
Rugose Corals ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship ◽  
Biologic Factors

The Mesozoic-Cenozoic coral Order Scleractinia has been suggested to have originated or evolved (1) by direct descent from the Paleozoic Order Rugosa or (2) by the development of a skeleton in members of one of the anemone groups that probably have existed throughout Phanerozoic time. In spite of much work on the subject, advocates of the direct descent hypothesis have failed to find convincing evidence of this relationship. Critical points are:(1) Rugosan septal insertion is serial; Scleractinian insertion is cyclic; no intermediate stages have been demonstrated. Apparent intermediates are Scleractinia having bilateral cyclic insertion or teratological Rugosa.(2) There is convincing evidence that the skeletons of many Rugosa were calcitic and none are known to be or to have been aragonitic. In contrast, the skeletons of all living Scleractinia are aragonitic and there is evidence that fossil Scleractinia were aragonitic also. The mineralogic difference is almost certainly due to intrinsic biologic factors.(3) No early Triassic corals of either group are known. This fact is not compelling (by itself) but is important in connection with points 1 and 2, because, given direct descent, both changes took place during this only stage in the history of the two groups in which there are no known corals.

Choosing a Markov blanket

2020 ◽  
Vol 43 ◽  
Author(s):  
Thomas Parr
Keyword(s):  
Markov Blanket ◽  
Target Article ◽  
The Relationship

Abstract This commentary focuses upon the relationship between two themes in the target article: the ways in which a Markov blanket may be defined and the role of precision and salience in mediating the interactions between what is internal and external to a system. These each rest upon the different perspectives we might take while “choosing” a Markov blanket.

Tinkering with cognitive gadgets: Cultural evolutionary psychology meets active inference

2019 ◽  
Vol 42 ◽  
Author(s):  
Paul Benjamin Badcock ◽  
Axel Constant ◽  
Maxwell James Désormeau Ramstead
Keyword(s):  
Evolutionary Psychology ◽  
Research Program ◽  
Active Inference ◽  
Innovative Research ◽  
Cognitive Faculties ◽  
Cultural Evolutionary ◽  
The Relationship

Abstract Cognitive Gadgets offers a new, convincing perspective on the origins of our distinctive cognitive faculties, coupled with a clear, innovative research program. Although we broadly endorse Heyes’ ideas, we raise some concerns about her characterisation of evolutionary psychology and the relationship between biology and culture, before discussing the potential fruits of examining cognitive gadgets through the lens of active inference.

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