Age Determination of the Collared Peccary by the Tooth-Replacement Pattern

Elasmobranch fishes cannot at present be aged by scale or otolith readings as can certain teleosts. Consequently comparatively little is known about their age or rate of growth, particularly in the case of larger sharks. Alternative methods of age determination within this group have utilized tagging data (Bonham et al., 1949; Holden, 1972); size frequencies (Olsen, 1954; Aasen, 1966); the spine of Squalus sp. (Kaganovskaia, 1933; Holden & Meadows, 1962); tooth-replacement rates (Moss, 1967, 1972) and vertebral rings. These rings on the vertebral centra, resulting from variations in calcification, have also been used in the age determination of teleosts. In the scombroids there is often considerable variation in results even between authors working on the same species, mainly due to difficulty in interpreting the rings and deciding whether they are true year marks (Aikawa & Katô, 1938; Partlo, 1955; Otsu & Uchida, 1959; Hui-chong, Nose & Hiyama, 1965).

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Dentition and age determination of the Warthog Phacochoerus aethiopicus in Zululand, South Africa

Koedoe ◽

10.4102/koedoe.v27i1.553 ◽

1984 ◽

Vol 27 (1) ◽

Cited By ~ 14

Author(s):

D.R Mason

Keyword(s):

Population Control ◽

Age Determination ◽

Dry Mass ◽

Eye Lens ◽

Tooth Replacement ◽

Older Individuals ◽

Age Classes ◽

Relative Growth ◽

Reliable Differentiation

Age-specific stages of tooth replacement, eruption and attrition are described for warthogs shot during population control in Zululand. Patterns of tooth replacement and eruption allowed reasonably accurate age determination up to 24 months, whereafter 2-3 year old warthogs could generally be distinguished from older individuals by the relative growth of their third molars. Although stages of wear and loss of the teeth, especially the three molars, were associated with broad age classes, age of adult warthogs may be determined more precisely by counting cementum annuli in sectioned incisor teeth. However, cementum annuli were insufficiently distinctive to permit age estimation in approximately 33 of sections, reflecting particularly variation in intensity and clarity of staining and splitting and merging of rest lines. The use of eye lens dry mass and tusk length: snout width ratios as indices of age was also evaluated. Eye lens dry mass became increasingly unreliable for predicting age beyond 24 months. Considering males and females separately, tusk length: snout width ratios for yearling, 2-3 year old and 3-4 year old warthogs were reasonably distinctive, but subsequent overlap was apparently unfavourable for reliable differentiation of year classes among older warthogs. Body size and tusk * development criteria for distinguishing between three age classes ofwarthogs in the field are presented.

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Analysis of Fibronectin and TGF-β1 Immunoexpression to Determination of Wound Vitality in Wistar Rats (Rattus norvegicus)

Journal Of Medicine & Health ◽

10.28932/jmh.v1i1.499 ◽

2015 ◽

Vol 1 (1) ◽

Author(s):

Nita Novita ◽

Hasrayati Agustina ◽

Bethy S. Hernowo ◽

Abdul H. Hassan

Keyword(s):

Rattus Norvegicus ◽

Wistar Rats ◽

Age Determination ◽

Scientific Field ◽

Wound Age ◽

Forensic Practice ◽

Randomized Design ◽

Completely Randomized Design ◽

Tgf Β1

Wound examination is indispensable in forensic practice. The scientific field of wound age determination has advanced progressively during recent years.The purpose of this study was to determine the differences of fibronectin and TGF-β1 expression in both antemortem and postmortem wounds. This study was an experimental with completely randomized design. The skin wounds (vital and postmortem) were taken from fourty Wistar rats and divided into 10 groups of rats. Immunohistochemical staining was performed to determine the differences between antemortem and postmortem wounds. The result showed that in 30 minutes after antemortem wound infliction, all of samples showed weak reactivity for fibronectin and TGF-β1 (100%). In first hour after wound infliction, 3 samples (75%) showed weakly positive and 1 sample (25%) strongly positive for fibronectin and TGF-β1. In 2 hour after wound infliction, 1 sample (25%) showed weakly positive and 3 sample (75%) strongly positive for fibronectin and TGF-β1. In 3 and 4 hour after wound infliction, all of samples strongly positive for fibronectin and TGF-β1. In postmortem wound, all of samples showed negativity for fibronectin and TGF-β1. In conclusion, fibronectin and TGF-β1 may be useful in the determination of wound vitality. Keywords: wound, fibronectin, TGF-β1, vitality

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Validation and Application of Skeletochronology for Age Determination of the Ryukyu Ground Gecko, Goniurosaurus kuroiwae (Squamata: Eublepharidae)

Asian Herpetological Research ◽

10.3724/sp.j.1245.2013.00233 ◽

2014 ◽

Vol 4 (4) ◽

pp. 233-241

Author(s):

KURITA Takaki ◽

TODA Mamoru

Keyword(s):

Age Determination

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Problems associated with the age determination of the oldest pottery yielding cultural layers at the Studenoe 1 site, Transbaikal (southern Siberia)

Quaternary International ◽

10.1016/j.quaint.2021.02.002 ◽

2021 ◽

Author(s):

Masami Izuho ◽

Fumie Iizuka ◽

Ian Buvit ◽

Mikhail V. Konstantinov

Keyword(s):

Age Determination ◽

Southern Siberia ◽

Cultural Layers

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Directly ageing the Caribbean spiny lobster, Panulirus argus with validated band counts from gastric mill ossicles

ICES Journal of Marine Science ◽

10.1093/icesjms/fsy177 ◽

2018 ◽

Vol 76 (2) ◽

pp. 442-451 ◽

Cited By ~ 7

Author(s):

Gaya Gnanalingam ◽

Mark J Butler ◽

Thomas R Matthews ◽

Emily Hutchinson ◽

Raouf Kilada

Keyword(s):

Spiny Lobster ◽

Age Determination ◽

Florida Keys ◽

Panulirus Argus ◽

Gastric Mill ◽

Coefficients Of Variation ◽

The Caribbean ◽

First Time ◽

Reader Experience

Abstract In crustaceans, ecdysis was long believed to result in the loss and replacement of all calcified structures, precluding the use of conventional ageing methods. However, the discovery of bands in the gastric ossicles of several crustaceans with some correlation with age suggests that direct age estimation may be possible. We applied this method to a tropical spiny lobster, Panulirus argus, one of the most iconic and economically valuable species in the Caribbean. The presence of growth bands was investigated using wild lobsters of unknown age and was validated with captive reared lobsters of known age (1.5–10 years) from the Florida Keys, Florida (USA). Bands were consistently identified in ptero- and zygo-cardiac ossicles of the gastric mill and did not appear to be associated with moulting. Validation with known age animals confirms that bands form annually. Counts between independent readers were reproducible with coefficients of variation ranging from 11% to 26% depending on reader experience and the structure used. This study demonstrates, for the first time, that direct age determination of P. argus is possible.

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