Effect of changes in resource level on age and size at metamorphosis in Hyla squirella

Oecologia ◽  
1997 ◽  
Vol 112 (2) ◽  
pp. 187-192 ◽  
Author(s):  
Christopher W. Beck
Keyword(s):  
Hyla Squirella ◽  
Resource Level ◽  
Size At Metamorphosis

Behaviour and growth of southern leopard frog (Rana sphenocephala) tadpoles: effects of food and predation risk

2001 ◽  
Vol 79 (5) ◽  
pp. 809-814 ◽  
Author(s):  
K J Babbitt
Keyword(s):  
Food Resource ◽  
Leopard Frog ◽  
Rana Sphenocephala ◽  
Food Treatment ◽  
Leopard Frogs ◽  
Resource Level ◽  
Size At Metamorphosis ◽  
Interesting Possibility ◽  
Limited Food ◽  
Level I

I examined the effects of a nonlethal predator, larvae of the odonate Anax junius, and food-resource level on behaviour and growth of larval southern leopard frogs (Rana sphenocephala) to test whether the strength of effects of a nonlethal predator was influenced by background resource level. I crossed two levels of food resources, growth-limiting and non-growth-limiting, with the presence or absence of A. junius. Tadpoles responded to predators by altering spatial distribution and activity. When predators were present, tadpoles on both food treatments had similar low levels of activity, but tadpoles on the nonlimiting food treatment showed a much larger reduction in activity than tadpoles on the growth-limiting treatment. Tadpoles on both food treatments delayed metamorphosis when exposed to predators. Growth and size at metamorphosis were affected significantly by food treatment but not by predator treatment. However, the direction of response to predators differed. Tadpoles on the growth-limiting treatment were larger at metamorphosis and grew faster when exposed to predators; the opposite was true for tadpoles on the non-growth-limited food treatment. This raises the interesting possibility that for some species experiencing low resource availability, predators may induce a behaviourally mediated positive effect on growth.

scholarly journals Calcein staining of calcified structures in pearl oyster Pinctada margaritifera and the effect of food resource level on shell growth

Aquaculture ◽  
2011 ◽  
Vol 313 (1-4) ◽  
pp. 149-155 ◽  
Author(s):  
Clémentine Linard ◽  
Yannick Gueguen ◽  
Jacques Moriceau ◽  
Claude Soyez ◽  
Bélinda Hui ◽  
...  
Keyword(s):  
Shell Growth ◽  
Food Resource ◽  
Pearl Oyster ◽  
Pinctada Margaritifera ◽  
Resource Level ◽  
Effect Of Food

Determinants of size at metamorphosis in an endangered amphibian and their projected effects on population stability

Oikos ◽  
2014 ◽  
Vol 124 (6) ◽  
pp. 724-731 ◽  
Author(s):  
Christopher A. Searcy ◽  
Helen Snaas ◽  
H. Bradley Shaffer
Keyword(s):  
Population Stability ◽  
Size At Metamorphosis

Carry-over Effects of Size at Metamorphosis in Red-eyed Treefrogs: Higher Survival but Slower Growth of Larger Metamorphs

Biotropica ◽  
2015 ◽  
Vol 47 (2) ◽  
pp. 218-226 ◽  
Author(s):  
Rebecca D. Tarvin ◽  
Catalina Silva Bermúdez ◽  
Venetia S. Briggs ◽  
Karen M. Warkentin
Keyword(s):  
Size At Metamorphosis ◽  
Carry Over

Size at Metamorphosis and Water Loss in a Desert Anuran (Scaphiopus couchii)

Copeia ◽  
1994 ◽  
Vol 1994 (2) ◽  
pp. 372 ◽  
Author(s):  
Robert A. Newman ◽  
Arthur E. Dunham
Keyword(s):  
Water Loss ◽  
Scaphiopus Couchii ◽  
Size At Metamorphosis

Abnormal behavior detection using resource level to service level metrics mapping in virtualized systems

2020 ◽  
Vol 102 ◽  
pp. 680-700 ◽  
Author(s):  
Souhila Benmakrelouf ◽  
Cédric St-Onge ◽  
Nadjia Kara ◽  
Hanine Tout ◽  
Claes Edstrom ◽  
...  
Keyword(s):  
Service Level ◽  
Abnormal Behavior ◽  
Behavior Detection ◽  
Resource Level ◽  
Abnormal Behavior Detection

Anuran life history plasticity: Variable practice in determining the end-point of larval development

2010 ◽  
Vol 31 (2) ◽  
pp. 157-167 ◽  
Author(s):  
Patrick Thomas Walsh
Keyword(s):  
Life History ◽  
Developmental Stages ◽  
Life Cycles ◽  
Developmental Phase ◽  
Larval Phase ◽  
End Point ◽  
Anuran Amphibians ◽  
Individual Fitness ◽  
Metamorphic Climax ◽  
Size At Metamorphosis

AbstractPlasticity in the timing of life history events and their impact on individual fitness, particularly the timing of and size at metamorphosis in animals with complex life cycles such as anuran amphibians, has long been of interest to ecologists. For different studies on life history plasticity to be comparable, there must be clearly defined and commonly agreed transition points, but it is unclear how consistently this is being performed in studies using anuran amphibians. In a review of 157 published studies, I found considerable variation in defining the end point of the larval phase. While a slight majority used the emergence of the forelimbs as the conclusion of the larval phase, some used a period within the developmental phase of metamorphic climax and others used the resorption of the tail. Studies included in this review, that assessed the same life history variable at two different developmental stages, reported some differences in results depending on which developmental stage was used. Recent evidence also shows that metamorphic climax is itself a period which can vary with environmental conditions, but, even in studies that included part or all of metamorphic climax in the larval phase, the treatment of individuals during metamorphic climax was not reported. Therefore, I argue that life history studies on anuran amphibians should distinguish the following phases: larval, metamorphic climax, juvenile, adult; that the end of the larval phase is best defined in ecological studies by forelimb emergence and that conditions under which individuals undergo metamorphic climax should be fully described.

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