Total Body Rings Increase with Latitude and Decrease with Precipitation in Forest Millipedes Centrobolus Cook, 1897| Chapter 13 | New Visions in Biological Science Vol.9

 Juliformia's size is determined by two factors: body diameter and number of rings. The researchers wanted to see if there were any links between latitude and precipitation and body rings and sexual size dimorphism (SSD) in Centrobolus. The number of body rings in females and latitude (r=-0.53, Z score=-2.35, n=19, p0.01) and the number of body rings in males and latitude (r=-0.41, Z score=-1.74, n=19, p=0.04) had a significant link. The number of body rings in females and precipitation (r=-0.60, Z score=-2.76, n=19, p0.01), as well as the number of body rings in males and precipitation (r=-0.60, Z score=-2.76, n=19, p0.01). The number of body rings differed somewhat between males and females (W=22.5, Z=-1.61, n=19, p=0.05); females had more rings. Lower precipitation, not temperature, is connected to an anamorphic rise in the number of body rings in higher latitudes (South).

Author(s) Details:

Mark Cooper,
School of Animal, Plant & Environmental Sciences University of the Witwatersrand, Johannesburg 2050, South Africa.

Please see the link here: https://stm.bookpi.org/NVBS-V9/article/view/5883

Why Sexual Size Dimorphism Increases with Longitude, Precipitation and Temperature and Decreases with Latitude in Forest Millipedes Centrobolus Cook, 1897| Chapter 9 | New Visions in Biological Science Vol.9

 The goal of this research was to see what happened when Bergmann's Rule collided with Rensch's Rule Sexual Size Dimorphism (SSD) and body size varied as a result of eco-geographical factors. In the woodland millipede genus Centrobolus, body size and SSD were associated with latitude, longitude, precipitation, and temperature. SSD and longitude (r=0.37, Z score=1.71, n=22, p=0.04), precipitation (r=0.29, Z score=1.28, n=22, p0.010), and temperature (r=0.34, Z score=1.49, n=22, p0.07) all had significant positive relationships. SSD and latitude had a significant relationship (r=-0.44, Z score=2.05, n=22, p=0.02). Larger females and greater SSD exist in warmer, wetter north-eastern settings, indicating eco-geographical variation in polygynandrous reproductive systems.

Author(s) Details:

Mark Cooper,
School of Animal, Plant & Environmental Sciences University of the Witwatersrand, Johannesburg 2050, South Africa.

Please see the link here: https://stm.bookpi.org/NVBS-V9/article/view/5875