Preliminary Results on the Crystal Structure of Some Ammonium Salts with Substituted Aliphatic Chains

Scheffer, Victor B.

doi:10.1126/science.112.2907.309-a

Cited by 158 publications

(71 citation statements)

References 5 publications

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“…That these major dentin increments are deposited on an annual basis was first suggested by Tomes (1904:195-196) and recently by Scheffer (1950) andLaws (1953a), who observed that the annular ridges on the root occur at regular intervals (Fig. 73).…”

Section: Basic Form and Structurementioning

confidence: 80%

Ecology and Biology of the Pacific Walrus,Odobenus rosmarus divergensIlliger

Fay¹

1982

North American Fauna

394

567

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Section: Basic Form and Structurementioning

confidence: 80%

Ecology and Biology of the Pacific Walrus,Odobenus rosmarus divergensIlliger

Fay¹

1982

North American Fauna

394

567

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“…The culling location of each individual was recorded on a map (1:50,000). Deer age was determined by examining the annual layers in the tooth cementum ([2 years old) (Scheffer 1950), and by the degree of replacement of milk teeth by permanent teeth (0-2 years old) (Ohtaishi 1980). For the data analysis, only two age classes (yearling and adult) were used because the sika deer is known to show stable age-specific pregnancy rates when becoming adult (Takatsuki 2006).…”

Section: Deer Pregnancymentioning

confidence: 99%

Forest edge creates small‐scale variation in reproductive rate of sika deer

et al. 2007

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Habitat edges are considered to have an important role in determining the abundance of deer in forest landscapes, but to our knowledge there are few lines of evidence indicating that forest edge enhances the vital rate of deer. We examined pregnancy of female sika deer in Boso peninsula, central Japan, and explored how forest edges, food availability in forests, and local population density influence the pregnancy rate of sika deer. Local deer density was estimated by the number of fecal pellets, and food availability in forests was estimated by combining GIS data of vegetation distribution and the relationship between vegetation biomass and local deer density. Forest edge length was also determined by GIS data. Model selection was performed with multiple logistic regression analyses using the AIC to find the best model for accounting for the observed variation in pregnancy rates of the deer. Multiple logistic regression analysis showed that the length of forest edge had a positive effect on the pregnancy rate of females, whereas food availability in forests and local deer density had little effect. This forest edge effect was detected in a 100-200-m radius from deer captured locations, indicating that deer pregnancy is primarily determined by habitat quality within a 10-ha area. This result was confirmed by tracking females with GPS telemetry, which found that the core areas of the home range were less than 12 ha. The positive effect of edges and the lack of density dependence could be a result of high plant productivity in open environments that produces forages not depleted by high deer densities. Our results support the view that land management is the cause of the current problem of deer overabundance.

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“…From each individual a superior canine was extracted and aged in the laboratory by counting dentine growth layers (Scheffer 1950, Klevezal 1996. Dental collagen was collected from each one of the growth layers and isotopic analysis was conducted to obtain an ontogenetic profile for each individual ( Table 1).…”

Section: Methodsmentioning

confidence: 99%

Ontogenetic changes in feeding habits of northern elephant seals revealed by δ15N and δ13C analysis of growth layers in teeth

Riofrío-Lazo¹,

Aurioles‐Gamboa²,

Bœuf³

2012

Mar. Ecol. Prog. Ser.

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15N value 1.8 ‰ higher than the average of the adult female stage, suggesting that the fetal layer is more likely the product of the intensive nursing during the first month of life. KEY WORDS: Mirounga angustirostris · Stable isotope · Dentine growth layer · Ontogenetic dietary shifts · Feeding strategy · Isotope fractionationResale or republication not permitted without written consent of the publisher

show abstract

Preliminary Results on the Crystal Structure of Some Ammonium Salts with Substituted Aliphatic Chains

Cited by 158 publications

References 5 publications

Ecology and Biology of the Pacific Walrus,Odobenus rosmarus divergensIlliger

Ecology and Biology of the Pacific Walrus,Odobenus rosmarus divergensIlliger

Forest edge creates small‐scale variation in reproductive rate of sika deer

Ontogenetic changes in feeding habits of northern elephant seals revealed by δ15N and δ13C analysis of growth layers in teeth

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