[MCN] Heat doesn't have to be lethal to reduce animal population numbers

Lance Olsen lance at wildrockies.org
Sat Oct 19 13:18:21 EDT 2019


Phil. Trans. R. Soc. B 2009 
Effects of heat stress on mammalian reproduction
Peter J. Hansen*
Department of Animal Sciences, University of Florida
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2781849/pdf/rstb20090131.pdf <https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2781849/pdf/rstb20090131.pdf>  

From the Introduction

Heat stress can lead to disruptions in reproductive processes through two general mechanisms. First, the homeokinetic changes to regulate body temperature can compromise reproductive function. One example is redistribution of blood flow from the body core to the periphery to increase sensible heat loss. Another homeokinetic control mechanism for body temperature is reduced feed intake during heat stress. Reducing feed intake reduces metabolic heat production but also can lead to changes in energy balance and nutrient availability that can have large effects on cyclicity, establishment of pregnancy and foetal development. 

A second mechanism for disruption of reproduction during heat stress is the failure of homeokinetic systems to regulate reproduction. As will be seen in this paper, the rise in body temperature about its regulated set point can compromise function of germ cells, the early developing embryo, and perhaps other cells involved in reproduction. 

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“In a corrupt environment, resources will be directed toward such non-productive areas as the police, armed forces and other organs of social control and repression as the elites move to protect themselves, their positions and their material wealth … and resources otherwise available for socio-economic development will be diverted into security expenditure."

John McFarlane. Transnational Crime, Corruption and Crony Capitalism in the Twenty-First Century. Transnational Organized Crime. Vol. 4 No. 2, Summer 1998

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“Politicians strain to outdo each other with promises to 'get tough' on crime and to bring law and order back to the streets….There is no question that common street crime is an important social concern. But its image has become so bloated in the mirror of public opinion that it blocks our view of the white collar crimes which are both more costly and more dangerous to society."

James Coleman. The Criminal Elite. 1985. St. Martin's Press



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