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Metabolic Rate, Allometry, Energy-Equivalence Rule

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Metabolic Rate, Allometry, Energy-Equivalence Rule Main Points 1) Diet -- primitive monogastric, cecal fermentation, and ruminant fermentation -- ruminant digestion and an adaptive radiation -- example: the global distribution of mammalian herbivores 2) Metabolism and allometries -- universal patterns in ecology -- example: allometries for population density in carnivores Terms: cellulose, meristem, frugivory, coprophagy, fermentation, cud, succession, metabolic rate, allometry, energy-equivalence rule Pre-reading: Wednesday 11 October = NA Monday 16 October = Emlen and Oring 1 Diet: Insectivores and Carnivores • insectivory (including myrmecophagy) and carnivory -- simplest digestive tract -- no fermentation or cecum (or cecum is very small) -- food is readily digested, because of high energy content, no cell walls, and low fiber 2 Diet: Herbivores • Plants as mammal food: -- leaves are low in protein -- sugars less concentrated -- protected by biotic, chemical, and mechanical defenses chili w/chemical defense barrel cactus bullhorn acacia (capsaicin) w/mechanical defense w/mechanical (thorns) and (spines) biotic defense (ants) 3 Diet: Herbivores • Plants as mammal food -- cellulose in cell walls -- ontogeny of plants -- graminoid vs. forb meristems 4 Diet: Herbivores • primitive monogastric digestion -- simple alimentary canal (AKA digestive tract) -- often leads to frugivory or omnivory collared peccary bearded pig giant forest hog 5 Diet: Herbivores • hindgut or cecal fermentation -- enlarged cecum houses fermentation -- short rate of passage, low cellulose utilization -- may lead to coprophagy in smaller species mountain tapir 6 Diet: Herbivores • foregut or ruminant fermentation -- fermentation occurs in four-chambered stomach -- long rate of passage, high cellulose utilization, cuds American bison 7 Discussion Q: Families Bovidae and Cervidae have proliferated in the past 15,000 years, while rhinos, horses, and equids have declined in number. Come up with a hypothesis for why this has happened. 15,000 5 MYA 34 MYA 8 elk vicuna saiga saola water chevrotain 9 • succession = predictable changes through time in ecological communities 10 • succession = predictable changes through time in ecological communities • Grazing succession -- materials pass twice as fast through cecal fermenters -- protein assimilation less efficient than ruminants 11 • Grazing succession -- smaller animals have higher mass-specific metabolic rates -- smaller animals have higher relative energy demands, but lower absolute energy demands -- for smaller animals, intake is less, but assimilation must be high 12 Metabolism and body size • metabolic rate = energy consumption or expenditure, typically measured in kJ or kCal consumed per day 13 Metabolism and body size • metabolic rate = energy consumption or expenditure, typically measured in kJ or kCal consumed per day • allometry = change in trait or process with body size that is non-linear 14 Metabolism and body size • allometry = change in trait or process with body size that is non-linear 1:1 line Positive allometry Log Log rostrum size Rostrum size increases steeply (slope >1) with skull size 15 Log skull size Metabolism and body size • allometry = change in trait or process with body size that is non-linear Negative allometry 1:1 line Head size increases slowly (slope <1) with body size Log Log head size 16 Log body size Metabolism and body size • metabolic rate • allometry linear axes log10 axes Kcal/kg/day Kcal/kg/day Kcal/day Kcal/day 17 body mass (kg) body mass (kg) Metabolism and body size • metabolic rate • allometry total metabolism (kJ) = a(mass^0.75) mass-specific metabolism (kJ) = a(mass^-0.25) 18 Metabolism and body size Metabolic rate (W) Metabolic Slope = 0.75 body mass (kg) 19 Metabolism and body size ) 2 Density Density / km (inds Slope = -0.75 100 101 102 103 104 105 106 107 From Brown 1995 20 body mass (g) Metabolism and body size • Energetic-equivalence rule = change in abundance with body size is offset by change in metabolic rate with body size, so that populations exhibit invariance in energy use with respect to size. etabolism of of etabolism population m body mass (g) 21 body mass (g) body mass (g) Metabolism and body size K. Roy. 2017. “How to be an elephant” 22 http://katherineroy.com/elephants/ Digestion and global diversity of ungulates • Predictors of plant quantity: -- more rain = more plants -- higher soil fertility = more plants 23 Digestion and global diversity of ungulates • Predictors of plant quality: -- more rain = lower N and P content -- higher soil fertility = higher N and P content 24 Digestion and global diversity of ungulates • Plants are most abundant in wet, high-fertility environments klipspringer ~20 kg plains zebra ~200 kg buffalo ~800 kg 25 Digestion and global diversity of ungulates • Plants are most abundant in wet, high-fertility environments • Plants are most nutritious in dry, high-fertility environments klipspringer ~20 kg plains zebra ~200 kg buffalo ~800 kg 26 Dicussion Q: in light of the fact that plant quantity is most important to large ungulates, and plant quality is most important to small ungulates, come up with a hypothesis for where ungulate diversity should be highest. klipspringer ~20 kg plains zebra ~200 kg buffalo ~800 kg 27 Global diversity of ungulates 3000 kg 15 kg Plant available moisture Plant available N From Olff et al. 2002. 28 Global diversity of ungulates 3000 kg 15 kg Plant available moisture Plant available N From Olff et al. 2002. 29 Global diversity of ungulates Plant available moisture Plant available N 30 Global diversity of ungulates • High correspondence between predicted and observed diversity of large herbivores, based on rain and soil fertility • Suggests that plant-available nutrients and moisture maintain species diversity of ungulates 31.
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