Month: September 2022

Testing View in LinkedIn

WIDESPREAD CELL DEATH SYSTEMS. "Are Internal, Death-Promoting Mechanisms Ever Adaptive? Natural selection acts primarily on organisms, and the existence of evolved, active, internal mechanisms that cause organismal death would seem paradoxical. However, there is substantial evidence that internal death promoting mechanisms exist and are taxonomically widespread." View in LinkedIn

UNABLE TO POST REFERENCE TO THIS GROUP. Are Internal, Death-Promoting Mechanisms Ever Adaptive?" "John W Pepper, Deborah E Shelton, Armin Rashidi and Pierre M Durand. View in LinkedIn

SUICIDE AS ADAPTIVE? "The idea that self-inflicted organismal death could be adaptive sounds, at face value, absurd. An adaptation is a trait that is suitable (apt) for the current circumstances or environmental challenges, and archetypal examples include traits that promote survival." View in LinkedIn

DEATH AND FITNESS. "In multicellular organisms the program frequently (although not always) appears to be the result of fitness trade-offs. Here the death phenotype itself is not adaptive but the fitness related program most likely is." View in LinkedIn

GROUP FITNESS. "In some cases of behavioral suicide, particularly in insects, there are distinct advantages to kin and group level benefits may play a role. In unicells, programmed death is ubiquitous and programmed organismal death often provides benefits to others." View in LinkedIn

ADAPTIVE SENESCENCE. "Clearly it can be adaptive for a large organism to cause the senescence of specific organs or structures, such as leaves on a deciduous plant. Whole-organism senescence leading to death is more puzzling, and explaining it has been a long-standing challenge. If a large organism can build itself from a single cell, why can it not maintain itself once built? Or can organismal death actually be adaptive in some cases, in the sense of increasing Darwinian fitness?" View in LinkedIn

REPRODUCTIVE ZENITH. "The strongest appearance of programmed organismal death in organismal senescence is found in semelparous species, which reproduce only once during the life cycle. A common pattern in these species is that individuals appear healthy up to the time of reproduction, then decline rapidly and dramatically afterwards." View in LinkedIn

REFERENCE FOR TODAY: Are Internal, Death-Promoting Mechanisms Ever Adaptive?" "John W Pepper, Deborah E Shelton, Armin Rashidi, and Pierre M Duran. (This reference refuses to post normally on LI). View in LinkedIn

HORMONAL EXECUTIONER. "Semelparity is common in long-lived plants, occurring in representatives of at least 20 different families. In most cases, the proximate mechanisms of death are unknown, but there is evidence in some species for an internally generated “senescence signal”, which may be a hormone." (Semelparity = single reproductive event before death). View in LinkedIn