The Breeding biology of Pseudocheirus peregrinus viverrinus on FLinders ISland, Bass Strait

1995 ◽  
Vol 22 (4) ◽  
pp. 521 ◽  
Author(s):  
S Munks

Reproduction in Pseudocheirus peregrinus viverrinus in coastal teatree woodland on Flinders Island was seasonal. The main birth season was from May to August. The mean duration of lactation was 29 weeks. The duration of lactation for multiparous females that bred twice in a year was significantly shorter than that of multiparous single breeders. In general the young left the pouch during early spring and were fully weaned by the early summer months. In contrast to populations of P. peregrinus inhabiting similar woodland in Victoria only a few multiparous females (6-9%) gave birth to a second litter in the springlsummer months on Flinders Island. The mean litter size (1.84) and annual fecundity of the population (1.91 offspring per female) were lower than those reported for three populations of Pseudocheirus peregrinus in Victoria. It is suggested that the low occurrence of spring/summer births and low fecundity of P. p. viverrinus on Flinders Island may be related to the age and nutrient status of their coastal teatree forest habitat. The body mass of P. p. viverrinus was higher than previously recorded for P. peregrinus. The adult body mass of females ranged from 948 to 1082 g. Adults showed seasonal variation in body mass with most females losing weight during the late spring and summer months coincident with late lactation. It is proposed that the larger body size of P. p. viverrinus on Flinders Island is a result of release from predation pressure and/or interspecific competition.

1983 ◽  
Vol 40 (6) ◽  
pp. 749-753 ◽  
Author(s):  
M. John Tremblay ◽  
John C. Roff

We estimated annual secondary production by copepod species on the Emerald Bank, Scotian Shelf, for the first time. We tentatively ranked copepod species in order of importance based on production to biomass (P/B) ratios calculated from adult body mass using an empirical relationship. The significance of assessing species in terms of production rather than population biomass is demonstrated. The mean estimate of total copepod production (530 kJ∙m−2) is in good agreement with previous estimates of secondary production on the Scotian Shelf.


2007 ◽  
Vol 16 (3) ◽  
pp. 626-628 ◽  
Author(s):  
Kirsten B. Moysich ◽  
Julie A. Baker ◽  
Ravi J. Menezes ◽  
Vijayvel Jayaprakash ◽  
Kerry J. Rodabaugh ◽  
...  

2012 ◽  
Vol 43 (6) ◽  
pp. 837-854 ◽  
Author(s):  
Heather H. McClure ◽  
J. Mark Eddy ◽  
Jean M. Kjellstrand ◽  
J. Josh Snodgrass ◽  
Charles R. Martinez

2019 ◽  
Vol 98 (7) ◽  
pp. E81-E86 ◽  
Author(s):  
Mehmet Surmeli ◽  
Ildem Deveci ◽  
Hasan Canakci ◽  
Mustafa Salih Canpolat ◽  
Burak Karabulut ◽  
...  

In this study, we aimed to investigate the relationship between the body mass index (BMI) and the morphometric properties of auricula and its acoustic gain characteristics. A total of 45 participants between 18 and 45 years of age were enrolled into the study. Participants’ height and weight measurements were recorded for the BMI calculation. On both sides, the morphometric properties of the auricula were measured and recorded. Additionally, the participants were subjected to multidirectional dynamic real ear measurements (REMs) to specify the intensity and frequency values of the maximum hearing gain. Participants consisted of 24 women and 21 men. The mean BMI was 23.42. The mean auricular area was 22.70 cm2. Statistically significant positive correlation was found between the auricular area and BMI ( r = 0.427, P = .03). The mean postauricular sulcus angle was 20.99°. The mastoid-helix distance was 16.07 mm. There was no statistically significant correlation between BMI level and postauricular sulcus angle and mastoid-helix distance ( P > .05). The mean dynamic REM measurement was evaluated. The maximum acoustic gain at anterior, lateral, and posterior vectorial stimulation was calculated as 20.9, 24.2, and 20.7 dB Sound Presure Level (SPL), respectively. Statistically significant negative correlation was found between the three directions acoustic gain level and BMI in the statistical examination ( r = −0.365, r = −0.386, r = −0.453, respectively, and P < .05 for all). The results of acoustic gain frequency were 2967.4, 2963, and 2934 Hz, respectively. There was no statistically significant correlation between acoustic gain frequency and BMI ( P > .05). When participants were grouped according to their BMI, participants with a BMI >25 had a statistically significantly bigger auricular area and lower maximum acoustic gain when compared with those with BMI <25 ( P < .05). We found that the auricular area increased with BMI. We think that this is related to soft tissue thickening of the auricula related to high BMI. In addition, we found that the acoustic gain level decreased inversely with BMI. We believe that the decrease in acoustic gain is due to the increase of acoustic resistance after the increase of soft tissue thickness. In conclusion, we think that BMI has a negative effect on auditory function according to findings in our study.


2017 ◽  
Vol 49 (8) ◽  
pp. 1174-1181 ◽  
Author(s):  
Matthew R Robinson ◽  
◽  
Geoffrey English ◽  
Gerhard Moser ◽  
Luke R Lloyd-Jones ◽  
...  

2019 ◽  
Vol 76 (3) ◽  
pp. 438-446 ◽  
Author(s):  
Stéphanie Guernon ◽  
Matthew C. Yates ◽  
Dylan J. Fraser ◽  
Alison M. Derry

We tested if there was a difference in mass-specific excretion rate between two genetically size-divergent brook trout (Salvelinus fontinalis) populations that can be accounted for by genetic/maternal factors. We conducted laboratory-based common garden experimentation using F1 generation fish, with five to seven families per population at two ages (0.5 year juveniles and 1.5 years adults). We found that genetic/maternal differences in excretion rate on a per gram basis coevolve with genetic divergence in adult body mass between the populations. However, this coevolution has also resulted in no net difference in excretion rate between populations when differences in adult body mass were accounted for. Uncertainty in census estimates and variation in body mass distributions created substantial variation in extrapolated whole-population excretion estimates. No other studies to our knowledge have tested for genetic/maternal divergence in excretion rate between genetically size-divergent fish populations. Genetically based population divergence in body mass, energy allocation in reproduction, and mass-specific excretion rate in the brook trout was likely a result of selection associated with differences in the availability of overwintering habitat between streams.


2010 ◽  
Vol 8 (2) ◽  
pp. 165-172 ◽  
Author(s):  
Sarah M. Camhi ◽  
Peter T. Katzmarzyk ◽  
Stephanie Broyles ◽  
Sathanur R. Srinivasan ◽  
Wei Chen ◽  
...  

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