Maternal body size and condition determine calf growth rates in southern right whales

2018 ◽  
Vol 592 ◽  
pp. 267-281 ◽  
Author(s):  
F Christiansen ◽  
F Vivier ◽  
C Charlton ◽  
R Ward ◽  
A Amerson ◽  
...  
Keyword(s):  
Body Size ◽  
Growth Rates ◽  
Maternal Body ◽  
Calf Growth ◽  
Right Whales ◽  
Southern Right Whales

BIOPSYING SOUTHERN RIGHT WHALES: THEIR REACTIONS AND EFFECTS ON REPRODUCTION

2005 ◽  
Vol 69 (3) ◽  
pp. 1171-1180 ◽  
Author(s):  
PETER B. BEST ◽  
DESRAY REEB ◽  
MARY BETH REW ◽  
PER J. PALSBØLL ◽  
CATHY SCHAEFF ◽  
...  
Keyword(s):  
Right Whales ◽  
Southern Right Whales

Cetacean morbillivirus in Southern Right Whales, Brazil

2018 ◽  
Vol 66 (1) ◽  
pp. 606-610 ◽  
Author(s):  
Kátia R. Groch ◽  
Karina R. Groch ◽  
Cristiane K. M. Kolesnikovas ◽  
Pedro V. de Castilho ◽  
Luciana M. P. Moreira ◽  
...  
Keyword(s):  
Right Whales ◽  
Southern Right Whales ◽  
Cetacean Morbillivirus

Circumpolar frontal systems as potential feeding grounds of Southern Right whales

2019 ◽  
Vol 176 ◽  
pp. 102123 ◽  
Author(s):  
Victoria González Carman ◽  
Alberto Piola ◽  
Todd D. O'Brien ◽  
Dmitriy D. Tormosov ◽  
E. Marcelo Acha
Keyword(s):  
Right Whales ◽  
Southern Right Whales ◽  
Frontal Systems ◽  
Feeding Grounds

scholarly journals Changing patterns of habitat use by southern right whales (Eubalaena australis) on their nursery ground at Península Valdés, Argentina, and in their long-range movements

2020 ◽  
pp. 133-143
Author(s):  
Victoria J. Rowntree ◽  
Roger S. Payne ◽  
Donald M. Schell
Keyword(s):  
Habitat Use ◽  
Nitrogen Isotope ◽  
Isotope Ratios ◽  
Small Scale ◽  
Nursery Ground ◽  
Adult Males ◽  
Human Disturbances ◽  
Eubalaena Australis ◽  
Right Whales ◽  
Southern Right Whales

Southern right whales (Eubalaena australis) have been studied on their nursery ground at Península Valdés, Argentina, every year since 1970. Since 1990, 1,208 individuals have been identified from photographs taken during annual aerial surveys; 618 whales were seen in two or more years. Patterns of habitat use have changed during the study in ways which suggest that right whales may be capable of substantial behavioral and ecological flexibility. One male and three females from Península Valdés have been sighted on other nursery grounds (Tristan da Cunha and southern Brazil). Three individuals from Península Valdés were sighted on feeding grounds off Shag Rocks and South Georgia. Some right whales from Península Valdés showed carbon and nitrogen isotope ratios very similar to those seen in right whales off South Africa, while others showed distinctive isotope ratios indicating that they fed in a different area. Whales of all ages and both sexes moved frequently between three major regions of concentration on the Península Valdés nursery ground. Subadults and adult females with calves were resighted at higher rates than adult males and females in non-calf years. Changes in the geographic distribution of whales at the Península include: (1) abandonment of a major region of concentration; (2) establishment of a nursery area adjacent to thecentre of a growing whalewatching industry; and (3) small-scale shifts in distribution, possibly in response to natural and human disturbances.

scholarly journals Variation in growth and instar number in field and laboratory Manduca sexta

2007 ◽  
Vol 274 (1612) ◽  
pp. 977-981 ◽  
Author(s):  
Joel G Kingsolver
Keyword(s):  
North Carolina ◽  
Body Size ◽  
Manduca Sexta ◽  
Growth Rates ◽  
Developmental Plasticity ◽  
Larval Growth ◽  
Physiological Control ◽  
Larval Instars ◽  
Laboratory Colony ◽  
Early Larval Development

The tobacco hornworm Manduca sexta has been an important model system for understanding physiological control of growth, development and metamorphosis of insects for more than half a century. Like all Manduca , M. sexta typically has five larval instars, with developmental commitment to metamorphosis occurring early in the 5th (final) instar. Here we show that M. sexta from a field population in North Carolina (USA) shows substantial intraspecific variation in the number of larval instars when feeding on a modified artificial diet. Individuals with six instars consistently exhibited slower growth rates during early larval development than individuals with five instars. The frequency of individuals with six instars decreased with increased rearing temperature. In contrast, M. sexta from a laboratory colony consistently had five instars, and had more rapid larval growth rates than M. sexta from the field. We identify a threshold body size at the start of the 5th instar that predicts whether an individual will have five (greater than 600 mg) or six instars (less than 600 mg). Variation in field populations in Manduca provides an important resource for understanding physiological control, developmental plasticity and evolution of growth rate, body size and instar number.

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