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Physical and Cognitive Performance of the Least Shrew (Cryptotis parva) on a Calcium-Restricted Diet.

Czajka JL, McCay TS, Garneau DE - Behav Sci (Basel) (2012)

Bottom Line: Shrews on the high-calcium diet made fewer errors in the maze than shrews on the low-calcium diet (F1,14 = 12.8, p < 0.01).Females made fewer errors than males (F1,14 = 10.6, p < 0.01).Shrews in calcium-poor habitats with low availability of mineral sources of calcium may have greater difficulty with cognitive tasks such as navigation and recovery of food hoards.

View Article: PubMed Central - PubMed

Affiliation: Albany Medical College, 47 New Scotland Avenue, Albany, NY 12208, USA; E-Mail: czajkaj1@mail.amc.edu.

ABSTRACT
Geological substrates and air pollution affect the availability of calcium to mammals in many habitats, including the Adirondack Mountain Region (Adirondacks) of the United States. Mammalian insectivores, such as shrews, may be particularly restricted in environments with low calcium. We examined the consequences of calcium restriction on the least shrew (Cryptotis parva) in the laboratory. We maintained one group of shrews (5 F, 5 M) on a mealworm diet with a calcium concentration comparable to beetle larvae collected in the Adirondacks (1.1 ± 0.3 mg/g) and another group (5 F, 3 M) on a mealworm diet with a calcium concentration almost 20 times higher (19.5 ± 5.1 mg/g). Animals were given no access to mineral sources of calcium, such as snail shell or bone. We measured running speed and performance in a complex maze over 10 weeks. Shrews on the high-calcium diet made fewer errors in the maze than shrews on the low-calcium diet (F1,14 = 12.8, p < 0.01). Females made fewer errors than males (F1,14 = 10.6, p < 0.01). Running speeds did not markedly vary between diet groups or sexes, though there was a trend toward faster running by shrews on the high calcium diet (p = 0.087). Shrews in calcium-poor habitats with low availability of mineral sources of calcium may have greater difficulty with cognitive tasks such as navigation and recovery of food hoards.

No MeSH data available.


Mean (± SE) running speed of least shrews maintained on mealworm diets with different calcium content.
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behavsci-02-00172-f002: Mean (± SE) running speed of least shrews maintained on mealworm diets with different calcium content.

Mentions: Shrews ran increasingly faster over the 10 weeks of the experiment (F3.5,49.1 = 43.8, p < 0.001), presumably as they became more proficient at this assay. Shrews completed the course at approximately 1.2 km h−1 at the beginning of the experiment and at approximately 2.0 km h−1 at the end (Figure 2). Improvement in performance over time was not affected by diet or sex (all interactions p > 0.05). Running speed was not affected by diet (F1,14 = 3.4, p = 0.087) or sex (F1,14 = 2.0, p = 0.18), though there was a tendency for shrews to run faster on the high calcium diet (Figure 2).


Physical and Cognitive Performance of the Least Shrew (Cryptotis parva) on a Calcium-Restricted Diet.

Czajka JL, McCay TS, Garneau DE - Behav Sci (Basel) (2012)

Mean (± SE) running speed of least shrews maintained on mealworm diets with different calcium content.
© Copyright Policy - open access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4217630&req=5

behavsci-02-00172-f002: Mean (± SE) running speed of least shrews maintained on mealworm diets with different calcium content.
Mentions: Shrews ran increasingly faster over the 10 weeks of the experiment (F3.5,49.1 = 43.8, p < 0.001), presumably as they became more proficient at this assay. Shrews completed the course at approximately 1.2 km h−1 at the beginning of the experiment and at approximately 2.0 km h−1 at the end (Figure 2). Improvement in performance over time was not affected by diet or sex (all interactions p > 0.05). Running speed was not affected by diet (F1,14 = 3.4, p = 0.087) or sex (F1,14 = 2.0, p = 0.18), though there was a tendency for shrews to run faster on the high calcium diet (Figure 2).

Bottom Line: Shrews on the high-calcium diet made fewer errors in the maze than shrews on the low-calcium diet (F1,14 = 12.8, p < 0.01).Females made fewer errors than males (F1,14 = 10.6, p < 0.01).Shrews in calcium-poor habitats with low availability of mineral sources of calcium may have greater difficulty with cognitive tasks such as navigation and recovery of food hoards.

View Article: PubMed Central - PubMed

Affiliation: Albany Medical College, 47 New Scotland Avenue, Albany, NY 12208, USA; E-Mail: czajkaj1@mail.amc.edu.

ABSTRACT
Geological substrates and air pollution affect the availability of calcium to mammals in many habitats, including the Adirondack Mountain Region (Adirondacks) of the United States. Mammalian insectivores, such as shrews, may be particularly restricted in environments with low calcium. We examined the consequences of calcium restriction on the least shrew (Cryptotis parva) in the laboratory. We maintained one group of shrews (5 F, 5 M) on a mealworm diet with a calcium concentration comparable to beetle larvae collected in the Adirondacks (1.1 ± 0.3 mg/g) and another group (5 F, 3 M) on a mealworm diet with a calcium concentration almost 20 times higher (19.5 ± 5.1 mg/g). Animals were given no access to mineral sources of calcium, such as snail shell or bone. We measured running speed and performance in a complex maze over 10 weeks. Shrews on the high-calcium diet made fewer errors in the maze than shrews on the low-calcium diet (F1,14 = 12.8, p < 0.01). Females made fewer errors than males (F1,14 = 10.6, p < 0.01). Running speeds did not markedly vary between diet groups or sexes, though there was a trend toward faster running by shrews on the high calcium diet (p = 0.087). Shrews in calcium-poor habitats with low availability of mineral sources of calcium may have greater difficulty with cognitive tasks such as navigation and recovery of food hoards.

No MeSH data available.