Development and characterization of novel microsatellite markers for the common earthworm (Lumbricus terrestris L.)

2007 ◽  
Vol 7 (6) ◽  
pp. 1060-1062 ◽  
Author(s):  
T. P. VELAVAN ◽  
HINRICH SCHULENBURG ◽  
NICO K. MICHIELS
Keyword(s):  
Microsatellite Markers ◽  
Lumbricus Terrestris ◽  
The Common ◽  
Earthworm Lumbricus

Memoirs: On the Relation of the Mitochondria and Golgi Apparatus to Yolk-Formation in the Egg-Cells of the Common Earthworm, Lumbricus Terrestris

1925 ◽  
Vol s2-69 (274) ◽  
pp. 291-316
Author(s):  
LESLIE A. HARVEY
Keyword(s):  
Golgi Apparatus ◽  
Nuclear Membrane ◽  
Lumbricus Terrestris ◽  
Yolk Formation ◽  
Central Mass ◽  
The Common ◽  
Yolk Nucleus ◽  
Earthworm Lumbricus

1. The yolk-nucleus is merely a mass of mitochondria. 2. The mitochondria arise as a cap of threads over the nucleus, and this cap grows in size and density, migrates away from the nuclear membrane and breaks up into its component mitochondrial threads. These threads become evenly spread throughout the cytoplasm of the cell. 3. The mitochondria are not clearly defined in the very young oogonia. 4. The Golgi apparatus consists of numbers of Golgi elements lying separate in the cytoplasm. There is never any attempt at concentration of these elements round one central mass. 5. The Golgi elements are probably little platelets or spheroids somewhat resembling blood corpuscles in shape. They are not rods. As fixed by Da Fano technique, each element is a little plate with a very lightly impregnating centre and a very heavily impregnating rim. 6. The Golgi elements may probably arise from the cytoplasm. 7. The nucleus contains two nucleoli; an early arising karyosome, homogeneous and solid in structure, and a plasmo some arising later This plasmosome is liquid in consistency and contains an argentophil core. The karyosome disappears before the oocyte is half grown, but the plasmosome remains in the nucleus while the egg remains in the ovary. 8. No visible nucleolar extrusions into the cytoplasm were observed. 9. Yolk probably arises from the cytoplasm; no direct metamorphosis of either mitochondria, Golgi apparatus, or nucleolus into yolk was observed.

scholarly journals Development and characterization of novel microsatellite markers for the Common Pheasant (Phasianus colchicus) using RAD-seq

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Biao Wang ◽  
Xuan Xie ◽  
Simin Liu ◽  
Xuejing Wang ◽  
Hong Pang ◽  
...  
Keyword(s):  
Microsatellite Markers ◽  
Phasianus Colchicus ◽  
Common Pheasant ◽  
The Common

Worms make risky choices too: the effect of starvation on foraging in the common earthworm (Lumbricus terrestris)

2018 ◽  
Vol 96 (11) ◽  
pp. 1278-1283 ◽  
Author(s):  
P. Sandhu ◽  
O. Shura ◽  
R.L. Murray ◽  
C. Guy
Keyword(s):  
High Risk ◽  
Risk Taking ◽  
Light Condition ◽  
Lumbricus Terrestris ◽  
Trade Offs ◽  
First Choice ◽  
Risk Condition ◽  
The Common ◽  
Foraging Choice ◽  
Earthworm Lumbricus

Species should avoid risks to protect accumulated fitness. However, when faced with starvation, organisms may accept risks to enhance future reproductive opportunities. We investigated the effect of starvation on risk-taking behaviour in the common earthworm (Lumbricus terrestris Linnaeus, 1758). Lumbricus terrestris are negatively phototactic annelids that feed on decaying plant matter at the soil surface. Feeding in high-light conditions is a potentially riskier choice, given the threats of visual predators and desiccation. We predicted that starvation in L. terrestris would increase risk-taking behaviour and decrease time taken (latency) to make choices. We manipulated the starvation level of L. terrestris individuals (nonstarved, half-starved, and fully starved) and presented them with a binary foraging choice. Lumbricus terrestris could choose either a low-food and dark condition (low-risk condition) or a high-food and light condition (high-risk condition). We found that starved individuals selected the high-risk condition more often than nonstarved individuals. Starved individuals also had a decreased latency to first choice. Risk-taking did not scale with level of starvation; there was no difference in foraging choice and latency between half- and fully starved individuals. Our results indicate that L. terrestris makes state-dependent foraging choices, providing insight into the importance of fundamental life-history trade-offs in this understudied species.

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