Intraspecific Variation in Metabolic Rate and Its Relationship with Productivity in the Cotton Rat, Sigmodon hispidus

1989 ◽  
Vol 70 (3) ◽  
pp. 520-531 ◽  
Author(s):  
T. L. Derting ◽  
P. A. McClure
Keyword(s):  
Metabolic Rate ◽  
Intraspecific Variation ◽  
Sigmodon Hispidus ◽  
Cotton Rat

scholarly journals Metabolic traits in brown trout (Salmo trutta) vary in response to food restriction and intrinsic factors

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Louise C Archer ◽  
Stephen A Hutton ◽  
Luke Harman ◽  
W Russell Poole ◽  
Patrick Gargan ◽  
...  
Keyword(s):  
Life History ◽  
Metabolic Rate ◽  
Intraspecific Variation ◽  
Brown Trout ◽  
Environmental Conditions ◽  
Food Restriction ◽  
Metabolic Rates ◽  
Intrinsic Factors ◽  
Metabolic Traits ◽  
Food Conditions

Abstract Metabolic rates vary hugely within and between populations, yet we know relatively little about factors causing intraspecific variation. Since metabolic rate determines the energetic cost of life, uncovering these sources of variation is important to understand and forecast responses to environmental change. Moreover, few studies have examined factors causing intraspecific variation in metabolic flexibility. We explore how extrinsic environmental conditions and intrinsic factors contribute to variation in metabolic traits in brown trout, an iconic and polymorphic species that is threatened across much of its native range. We measured metabolic traits in offspring from two wild populations that naturally show life-history variation in migratory tactics (one anadromous, i.e. sea-migratory, one non-anadromous) that we reared under either optimal food or experimental conditions of long-term food restriction (lasting between 7 and 17 months). Both populations showed decreased standard metabolic rates (SMR—baseline energy requirements) under low food conditions. The anadromous population had higher maximum metabolic rate (MMR) than the non-anadromous population, and marginally higher SMR. The MMR difference was greater than SMR and consequently aerobic scope (AS) was higher in the anadromous population. MMR and AS were both higher in males than females. The anadromous population also had higher AS under low food compared to optimal food conditions, consistent with population-specific effects of food restriction on AS. Our results suggest different components of metabolic rate can vary in their response to environmental conditions, and according to intrinsic (population-background/sex) effects. Populations might further differ in their flexibility of metabolic traits, potentially due to intrinsic factors related to life history (e.g. migratory tactics). More comparisons of populations/individuals with divergent life histories will help to reveal this. Overall, our study suggests that incorporating an understanding of metabolic trait variation and flexibility and linking this to life history and demography will improve our ability to conserve populations experiencing global change.

Seasonal Shifts in Thyroid Function in the Cotton Rat (Sigmodon hispidus)

1994 ◽  
Vol 75 (2) ◽  
pp. 520-528 ◽  
Author(s):  
T. E. Tomasi ◽  
D. A. Mitchell
Keyword(s):  
Thyroid Function ◽  
Sigmodon Hispidus ◽  
Cotton Rat ◽  
Seasonal Shifts

Sigmodon hispidus (Hispid cotton rat)

1968 ◽  
pp. 69-71
Author(s):  
T. C. Hsu ◽  
Kurt Benirschke
Keyword(s):  
Sigmodon Hispidus ◽  
Cotton Rat

scholarly journals Unique morphological characteristics in the ovary of cotton rat (Sigmodon hispidus)

2020 ◽  
Vol 66 (6) ◽  
pp. 529-538
Author(s):  
Md. Rashedul ISLAM ◽  
Osamu ICHII ◽  
Teppei NAKAMURA ◽  
Takao IRIE ◽  
Md. Abdul MASUM ◽  
...  
Keyword(s):  
Morphological Characteristics ◽  
Sigmodon Hispidus ◽  
Cotton Rat

Elevational Range Extension for the Hispid Cotton Rat, Sigmodon hispidus, (Rodentia: Muridae)

2002 ◽  
Vol 47 (4) ◽  
pp. 637 ◽  
Author(s):  
Jonathan L. Dunnum ◽  
Jennifer K. Frey ◽  
David S. Tinnin ◽  
Jorge Salazar-Bravo ◽  
Terry L. Yates
Keyword(s):  
Range Extension ◽  
Sigmodon Hispidus ◽  
Cotton Rat ◽  
Elevational Range
Sign in / Sign up

Export Citation Format

Share Document