The role of developmental rate, body size, and positional behavior in the evolution of covariation and evolvability in the cranium of strepsirrhines and catarrhines

2021 ◽  
Vol 151 ◽  
pp. 102941
Author(s):  
Catalina I. Villamil
Keyword(s):  
Body Size ◽  
Developmental Rate ◽  
Positional Behavior

The role of underestimating body size for self-esteem and self-efficacy among grade five children in Canada

2015 ◽  
Vol 25 (10) ◽  
pp. 753-759 ◽  
Author(s):  
Katerina Maximova ◽  
Mohammad K.A. Khan ◽  
S. Bryn Austin ◽  
Sara F.L. Kirk ◽  
Paul J. Veugelers
Keyword(s):  
Body Size ◽  
Self Efficacy ◽  
Self Esteem

Methyl mercury in zooplankton—the role of size, habitat, and food quality

2002 ◽  
Vol 59 (10) ◽  
pp. 1606-1615 ◽  
Author(s):  
Martin Kainz ◽  
Marc Lucotte ◽  
Christopher C Parrish
Keyword(s):  
Organic Matter ◽  
Fatty Acid ◽  
Body Size ◽  
Methyl Mercury ◽  
Size Fraction ◽  
Food Sources ◽  
Calanoid Copepods ◽  
Bacterial Food

Pathways of methyl mercury (MeHg) accumulation in zooplankton include ingestion of organic matter (OM). We analyzed fatty acid (FA) biomarkers in zooplankton to (i) investigate the effect of allochthonous and autochthonous OM ingestion on MeHg concentrations ([MeHg]) in zooplankton and (ii) examine how algal and bacterial food sources affect MeHg bioaccumulation. We partitioned bulk zooplankton samples (i.e., >500, 202, 100, and 53 μm) from Lake Lusignan (Québec) and measured [MeHg] and [FA] in each fraction. [MeHg] increased with increasing body size and was significantly higher in pelagic than in littoral macrozooplankton (>500 μm). The amount of the ingested terrestrial FA biomarker 24:0 indicated that less than 1% of the total FA in zooplankton was derived from allochthonous sources. More than 60% of the ingested FA originated from algal biomarkers and <10% from bacterial biomarkers. Relative amounts of algal-derived essential FA and bacterial FA were not associated with [MeHg] in any size fraction. In pelagic zones, the amount of MeHg in zooplankton related positively to the number of large organisms such as Calanoid copepods and Daphnia. We propose that the accumulation of MeHg in lacustrine zooplankton depends on the zooplankton habitat rather than on the quality of ingested food.

Accuracy of body size estimation: Role of biopsychosocial variables

Body Image ◽  
2006 ◽  
Vol 3 (2) ◽  
pp. 163-171 ◽  
Author(s):  
Marita P. McCabe ◽  
Lina A. Ricciardelli ◽  
Geeta Sitaram ◽  
Katherine Mikhail
Keyword(s):  
Body Size ◽  
Size Estimation ◽  
Body Size Estimation

Season of birth and subsequent body size: The potential role of prenatal vitamin D

2010 ◽  
Vol 23 (2) ◽  
pp. 190-200 ◽  
Author(s):  
Marta Krenz-Niedbała ◽  
Elżbieta A. Puch ◽  
Krzysztof Kościński
Keyword(s):  
Vitamin D ◽  
Body Size ◽  
Potential Role ◽  
Season Of Birth

The Role of Body Size in the Assembly of West Indian Bird Communities

Evolution ◽  
1983 ◽  
Vol 37 (5) ◽  
pp. 1062 ◽  
Author(s):  
Ted J. Case ◽  
John Faaborg ◽  
Ron Sidell
Keyword(s):  
Body Size ◽  
West Indian ◽  
Bird Communities ◽  
Indian Bird

scholarly journals The role of local versus biogeographical processes in influencing diversity and body‐size variation in mammal assemblages

2016 ◽  
Vol 6 (5) ◽  
pp. 1447-1456 ◽  
Author(s):  
Luiz Carlos S. Lopez ◽  
Marcos S. L. Figueiredo ◽  
Maria Paula de Aguiar Fracasso ◽  
Daniel Oliveira Mesquita ◽  
Ulisses Umbelino Anjos ◽  
...  
Keyword(s):  
Body Size ◽  
Size Variation ◽  
Body Size Variation ◽  
Mammal Assemblages

scholarly journals Cell proliferation controls body size growth, tentacle morphogenesis, and regeneration in hydrozoan jellyfish Cladonema pacificum

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7579 ◽  
Author(s):  
Sosuke Fujita ◽  
Erina Kuranaga ◽  
Yu-ichiro Nakajima
Keyword(s):  
Cell Proliferation ◽  
Body Size ◽  
Environmental Changes ◽  
Size Control ◽  
Cellular Mechanisms ◽  
Proliferating Cells ◽  
Size Growth ◽  
Local Cell ◽  
Proliferating Cell

Jellyfish have existed on the earth for around 600 million years and have evolved in response to environmental changes. Hydrozoan jellyfish, members of phylum Cnidaria, exist in multiple life stages, including planula larvae, vegetatively-propagating polyps, and sexually-reproducing medusae. Although free-swimming medusae display complex morphology and exhibit increase in body size and regenerative ability, their underlying cellular mechanisms are poorly understood. Here, we investigate the roles of cell proliferation in body-size growth, appendage morphogenesis, and regeneration using Cladonema pacificum as a hydrozoan jellyfish model. By examining the distribution of S phase cells and mitotic cells, we revealed spatially distinct proliferating cell populations in medusae, uniform cell proliferation in the umbrella, and clustered cell proliferation in tentacles. Blocking cell proliferation by hydroxyurea caused inhibition of body size growth and defects in tentacle branching, nematocyte differentiation, and regeneration. Local cell proliferation in tentacle bulbs is observed in medusae of two other hydrozoan species, Cytaeis uchidae and Rathkea octopunctata, indicating that it may be a conserved feature among hydrozoan jellyfish. Altogether, our results suggest that hydrozoan medusae possess actively proliferating cells and provide experimental evidence regarding the role of cell proliferation in body-size control, tentacle morphogenesis, and regeneration.

scholarly journals Genome size drives morphological evolution in organ-specific ways

2021 ◽  
Author(s):  
Michael W Itgen ◽  
Dustin S Siegel ◽  
Stanley K Sessions ◽  
Rachel Lockridge Mueller
Keyword(s):  
Body Size ◽  
Genome Size ◽  
Cell Size ◽  
Structural Changes ◽  
Morphological Evolution ◽  
Empty Space ◽  
Developmental Rate ◽  
Cellular Interactions ◽  
Structure Changes ◽  
Organ Specific

Morphogenesis is an emergent property of biochemical and cellular interactions during development. Genome size and the correlated trait of cell size can influence these interactions through its effects on developmental rate and tissue geometry, ultimately driving the evolution of morphology. We tested the effects of genome size and body size evolution on heart and liver morphology using nine species of the salamander genus Plethodon (genome sizes 29.3-67 Gb). Our results show that whole organ size is determined by body size, whereas tissue structure changes dramatically with evolutionary increases in genome size. In the heart, increased genome size is correlated with a reduction of myocardia in the ventricle, yielding proportionally less force-producing mass and more empty space. In the liver, increased genome size is correlated with fewer and larger vascular structures, positioning hepatocytes farther from the circulatory vessels that transport key metabolites. Although these structural changes should have obvious impacts on organ function, their effects on organismal performance and fitness are likely negligible because low metabolic rates in salamanders relax selective pressure on key metabolic organ performance. Overall, this study reveals the effects of large genome and cell size on the developmental systems producing the heart and liver.

The Role of Body Size in Complex Food Webs

2011 ◽  
pp. 181-223 ◽  
Author(s):  
Ute Jacob ◽  
Aaron Thierry ◽  
Ulrich Brose ◽  
Wolf E. Arntz ◽  
Sofia Berg ◽  
...  
Keyword(s):  
Body Size ◽  
Food Webs

scholarly journals The role of venom in the hunting and hoarding of prey differing in body size by the Eurasian water shrew, Neomys fodiens

2018 ◽  
Vol 99 (2) ◽  
pp. 351-362 ◽  
Author(s):  
Krzysztof Kowalski ◽  
Leszek Rychlik
Keyword(s):  
Body Size ◽  
Neomys Fodiens
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