Daily age estimation reveals rapid growth of age‐0 alligator gar in the wild

2019 ◽  
Vol 35 (6) ◽  
pp. 1218-1224
Author(s):  
Peter C. Sakaris ◽  
David L. Buckmeier ◽  
Nathan G. Smith ◽  
Daniel J. Daugherty
Keyword(s):  
Rapid Growth ◽  
Age Estimation ◽  
Alligator Gar ◽  
In The Wild

Reproduction in the red-legged pademelon, Thylogale stigmatica Gould (Marsupialia : Macropodidae), and age estimation and development of pouch young

1994 ◽  
Vol 21 (5) ◽  
pp. 553 ◽  
Author(s):  
PM Johnson ◽  
K Vernes
Keyword(s):  
Age Estimation ◽  
Post Partum ◽  
General Pattern ◽  
Age Determination ◽  
Gestation Period ◽  
Growth Equation ◽  
In Captivity ◽  
In The Wild ◽  
The Mean

The reproduction of Thylogale stigmatica in captivity was studied and a predictive growth equation for age determination of the pouch young was developed. The general pattern of reproduction involved an oestrous cycle of 29-32 days, a gestation period of 28-30 days and a mean pouch life of 184 days. A post-partum oestrus and mating generally followed birth. Births were observed in all months in captivity, and from October to June in the wild. Mean age of weaning of young was 66 days following permanent pouch emergence, and the mean ages at maturity for females and males was 341 and 466 days, respectively.

Facial Age Estimation with Images in the Wild

2016 ◽  
pp. 454-465
Author(s):  
Ming Zou ◽  
Jianwei Niu ◽  
Jinpeng Chen ◽  
Yu Liu ◽  
Xiaoke Zhao
Keyword(s):  
Age Estimation ◽  
In The Wild ◽  
Facial Age

scholarly journals BENDEL KESLINGMAS NO 121 TAHUN 2014

2014 ◽  
Vol 33 (121) ◽  
pp. 1-89
Author(s):  
Eka, Ima Amrizal, Dian Naeni, dkk
Keyword(s):  
Health Center ◽  
Cause Of Death ◽  
Age Estimation ◽  
Secondary Data ◽  
Health Problems ◽  
Life Chances ◽  
Parity Rate ◽  
In The Wild ◽  
Endemic Areas ◽  
The Government

Malaria is one of the health problems cause of death. Mosquito longevity is an important factor to estimate the transmission. How to estimate the age of the mosquitoes with the condition of mosquito ovaries. The reseach was conducted in the seven villages malaria endemic of Banyumas Regency that is Karangsalam village, Karanggintung, Ketanda, Bogangin, Selanegara, Banjarpanepen and Watuagung to know about describe the lifetime of the mosquito Anopheles Spp in the seven villages malaria endemic, describing delatasi, parity rate, life chances and the age estimation of mosquito Anopheles Spp. The method used is descriptive by describe te lifetime of the mosquito Anopheles Spp. The data used in this research is a secondary data obtained from health center and the BPS Banyumas regency. The result showed the age estimation of Anopheles Spp mosquitos in the seven village malaria endemic that is Karangsalam, Ketanda, Selanegara, Banjarpanepen and Watuagung unknown. In the Karanggintung village the age estimation An. balabacensis mosquito is 4,24 days, whereas in the Bogangin village the age estimation An. vagus mosquito is 2,16 days. Conclusion from the research is illustration lifetime Anopheles Spp in the seven village malaria endemic is overall obatained the age estimation highest of 4,24 days is An. balabacensis mosquito. So, An. balabacensis mosquito have the ability to live in the wild longer than other Anophles Spp mosquitos were found. From the result expected for the government to increase attention to the case of malaria, especially in malaria endemic areas.

scholarly journals Snake’s-head Fritillary Fritillaria meleagris (Liliaceae) in Britain: its distribution, habitats and status

2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Kevin J. Walker
Keyword(s):  
Sixteenth Century ◽  
Rapid Growth ◽  
Flagship Species ◽  
Introduced Populations ◽  
In The Wild ◽  
Historical Accounts

Snake’s-head Fritillary Fritillaria meleagris L. is a scarce plant of unimproved meadows where it was formerly considered to be a native British species. A review of 593 British sites showed that 80% of British populations were located in other habitats where it had been planted or had established from introductions nearby. Of the 118 populations located in unimproved meadows 53 occurred in floodplain grassland in central and southeast England where it has long been considered to be native. However, recent evidence suggests that it is more likely to be a modern introduction (neophyte). It seems inconceivable that such an attractive plant would have been overlooked in the wild by herbalists in the fifteenth and sixteenth centuries. Furthermore, the rapid growth of introduced populations in meadows in Sweden and England has shown that Fritillary populations in Britain could have reached their present size in the 300 years since they were first recorded in the wild. Historical accounts prove that it was being grown for ornament in large gardens in the sixteenth century, from where it presumably escaped along rivers to colonise meadows downstream. Regardless of its status, however, it remains a much-loved and valued component of the British flora and a flagship species for the conservation of floodplain grasslands.

scholarly journals Fine-Grained Age Estimation in the Wild With Attention LSTM Networks

2020 ◽  
Vol 30 (9) ◽  
pp. 3140-3152 ◽  
Author(s):  
Ke Zhang ◽  
Na Liu ◽  
Xingfang Yuan ◽  
Xinyao Guo ◽  
Ce Gao ◽  
...  
Keyword(s):  
Age Estimation ◽  
Fine Grained ◽  
In The Wild

scholarly journals Age and location influence the costs of compensatory and accelerated growth in a hibernating mammal

2020 ◽  
Vol 31 (3) ◽  
pp. 826-833 ◽  
Author(s):  
Sarah Heissenberger ◽  
Gabriela Medeiros de Pinho ◽  
Julien G A Martin ◽  
Daniel T Blumstein
Keyword(s):  
Rapid Growth ◽  
Somatic Growth ◽  
Seasonal Growth ◽  
Short Term ◽  
Annual Survival ◽  
Individual Fitness ◽  
Conflicting Demands ◽  
In The Wild ◽  
Structural Growth ◽  
Accelerated Growth

Abstract The increase of structural growth rates to compensate for a poor initial body condition, defined as compensatory growth, may have physiological costs, but little is known about its effects on individual fitness in the wild. Yellow-bellied marmots (Marmota flaviventer) are obligate hibernators and depend on fat accumulation acquired during an approximately 4-month summer to survive overwinter. We investigated the costs of survival and longevity of rapid growth in a wild population of yellow-bellied marmots. We used trapping data collected from 2002 to 2014 to calculate individual relative seasonal growth and assess its effects on longevity and annual survival of juveniles, yearlings, and adults. Sites were distributed in two main areas, down-valley and up-valley; the latter has a higher elevation and is an overall harsher environment. We found that relative seasonal growth had no effect on individual longevity or on juvenile and adult annual survival. For yearlings, the effect of relative seasonal growth on survival depended on the location: yearlings with high relative seasonal growth had lower survival if located up-valley, and higher survival if located down-valley. In conclusion, juveniles and adults do not appear to have detectable costs of rapid growth, although there are costs to yearling survival depending on environmental conditions. Substantial structural growth occurs when marmots are yearlings and our results are likely driven by the high conflicting demands of somatic growth versus maintenance at this stage. Thus, the costs of rapid growth are age and site dependent and may be seen in the short term for species facing temporal constraints on growth.

Survival, age estimation and sexual maturity of pouch young of the brush-tailed bettong (Bettongia penicillata) in captivity

2015 ◽  
Vol 37 (1) ◽  
pp. 29 ◽  
Author(s):  
Craig K. Thompson ◽  
Adrian F. Wayne ◽  
Stephanie S. Godfrey ◽  
R. C. Andrew Thompson
Keyword(s):  
Age Estimation ◽  
Sexual Maturity ◽  
Post Partum ◽  
Maternal Investment ◽  
Female Offspring ◽  
Accurate Predictor ◽  
Bettongia Penicillata ◽  
In Captivity ◽  
Survival And Development ◽  
In The Wild

The brush-tailed bettong or woylie (Bettongia penicillata) is a continuous and rapid breeder. However, research investigating the monthly survival and development of young woylies from parturition to parental independence is incomplete. The reproductive biology of eight female woylies was observed for 22 consecutive months within a purpose-built enclosure. Adult female woylies bred continuously and were observed caring for a dependant young 96% of the time. Pouch life of the young was ~102 days, with sexual maturity of female offspring reached as early as 122 days post partum. Crown–rump measurement was an accurate predictor of age for young restricted to the pouch, while skeletal morphometrics were a better predictor of age for ejected pouch young, young-at-foot and subadults. A four-month period between May and August of each study year accounted for 85% of pouch young mortality and 61% of pouch young births where the neonate went on to survive to subadult age. Here we discuss the possibility that pouch young born during the cooler, wetter months of May to August may have an increased chance of survival in the wild, resulting from an increased maternal investment being directed towards the rearing of ‘fitter’ progeny.

Studies on Marsupial Reproduction. 2. The oestrous cycle of Setonix Brachyurus.

1955 ◽  
Vol 3 (1) ◽  
pp. 44 ◽  
Author(s):  
GB Sharman
Keyword(s):  
Corpus Luteum ◽  
Blood Vessels ◽  
Mitotic Activity ◽  
Rapid Growth ◽  
Luteal Phase ◽  
Oestrous Cycle ◽  
Degenerative Changes ◽  
Vaginal Smear ◽  
In The Wild ◽  
Uterine Glands

Setonix brachyurus Quoy and Gaimard is polyoestrous, the length of the cycle being about 28 days. In the wild and in the newly domesticated female, oestrous cycles are resumed in late January after an anoestrous period of 3-5 months. During this period oestrus does not occur and ovary and uterus are shrunken and quiescent. Domestication for periods exceeding 1 yr results in a greatly shortened anoestrous period, culminating in a condition in which oestrus is repeated at regular monthly intervals throughout the year. Pro-oestrus is accompanied by rapid growth of one Graafian follicle, mitotic activity in the uterus, and usually by the onset of cornification in the vaginae and appearance of partly cornified cells in the smear. At oestrus the largest follicle reaches a diameter of almost 3.0 mm. Behavioural oestrus lasts about 12 hr. Ovulation follows 12-24 hr after oestrus and is independent of the act of copulation. Invasion of the collapsed follicle by blood vessels and the growth of a corpus luteum takes place after ovulation. Under the influence of the corpus luteum a luteal phase occurs in the uterus and lasts until about 18 days after oestrus. During the period of activity of the corpus luteum the vaginal smear is almost entirely composed of non-cornified cells and leucocytes. Following the cessation of the luteal phase degenerative changes occur in the uterus and the uterine glands are invaded by leucocytes. The changes during the oestrous cycle in Setonix are compared with those occurring in Didelphis and in other marsupials.

How old are giant squids? First approach to aging Architeuthis beaks

2020 ◽  
Vol 96 (2) ◽  
pp. 357-374 ◽  
Author(s):  
Catalina Perales-Raya ◽  
Aurora Bartolomé ◽  
Eva Hernández-Rodríguez ◽  
Manuel Carrillo ◽  
Vidal Martín ◽  
...  
Keyword(s):  
Rapid Growth ◽  
Age Estimation ◽  
Size Range ◽  
Lateral Wall ◽  
Marine Species ◽  
Constant Sequence ◽  
Giant Squid ◽  
Lower Jaw ◽  
Daily Deposition

The giant squid Architeuthis dux Steenstrup, 1857 is one of the largest and most enigmatic marine species. Its age estimation remains controversial with many estimates of maximum age ranging from 1 to 14 yrs. Successful results regarding the study of aging in cephalopod beaks for some octopod and oegopsid squids support using these structures for age estimation. We analyzed the beaks of 10 individuals, caught between 1995 and 2006, with reconstructed dorsal mantle lengths (DMLs) between 823 and 1418 mm. The beaks were measured and weighed, and their microstructure was analyzed in three ways: (1) in the rostrum area [rostrum sagittal sections (RSS)] for both upper and lower jaws, and the (2) inner lateral wall surfaces (LWS) and (3) inner crest surfaces (CS) for upper jaws. A constant sequence of increments was observed along the RSS, indicating that the use of lower jaws is more feasible due to the higher erosion and tighter packing of increments of upper jaws. The statolith of one individual was analyzed, resulting in 520 increments (579 increments from RSS of its lower jaw). Assuming daily deposition, the age estimations in RSS between 411 and 674 d suggest rapid growth of A. dux, averaging 1.97 mm DML d–1 (SD 0.45). When maximum ages were estimated by applying these results to the largest measured specimens in the literature (e.g., 2400 mm DML), an age of approximately 3 yrs was obtained. Analysis over a greater size range of individuals would allow more accurate age estimations of this emblematic squid.

Pose invariant age estimation of face images in the wild

2021 ◽  
Vol 202 ◽  
pp. 103123
Author(s):  
Jian Han ◽  
Wei Wang ◽  
Sezer Karaoglu ◽  
Wei Zeng ◽  
Theo Gevers
Keyword(s):  
Age Estimation ◽  
Face Images ◽  
In The Wild
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