Predatory risk increased due to egg-brooding inArmadillidium vulgare(Isopoda: Oniscidea)

Ethology ◽  
2018 ◽  
Vol 124 (4) ◽  
pp. 256-259 ◽  
Author(s):  
Seizi Suzuki ◽  
Kyoko Futami
Keyword(s):  
Egg Brooding

Confessional, and: Egg Brooding

2016 ◽  
Vol 40 (1) ◽  
pp. 91-94
Author(s):  
Sam Roxas-Chua
Keyword(s):  
Egg Brooding

Aggregations of Egg-Brooding Deep-Sea Fish and Cephalopods on the Gorda Escarpment: a Reproductive Hot Spot

2003 ◽  
Vol 205 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Jeffrey C. Drazen ◽  
Shana K. Goffredi ◽  
Brian Schlining ◽  
Debra S. Stakes
Keyword(s):  
Deep Sea ◽  
Hot Spot ◽  
Egg Brooding ◽  
Sea Fish

Role of progesterone on oocyte maturation in the egg-brooding hylid frogGastrotheca riobambae (fowler)

1983 ◽  
Vol 227 (2) ◽  
pp. 271-276 ◽  
Author(s):  
Carmen M. de Albuja ◽  
Margarita Campos ◽  
Eugenia M. del Pino
Keyword(s):  
Oocyte Maturation ◽  
Egg Brooding

Fertilization in an Egg-Brooding Colonial Ascidian Does Not Vary With Population Density

2004 ◽  
Vol 206 (3) ◽  
pp. 152-160 ◽  
Author(s):  
Aimee Phillippi ◽  
Ellen Hamann ◽  
Philip O. Yund
Keyword(s):  
Population Density ◽  
Colonial Ascidian ◽  
Egg Brooding

Phylogenetic systematics of egg-brooding frogs (Anura: Hemiphractidae) and the evolution of direct development

Zootaxa ◽  
2015 ◽  
Vol 4004 (1) ◽  
pp. 1 ◽  
Author(s):  
SANTIAGO CASTROVIEJO-FISHER ◽  
JOSÉ M. JR. PADIAL ◽  
IGNACIO DE LA RIVA ◽  
JOSÉ P. POMBAL, JR. ◽  
HELIO R. DA SILVA ◽  
...  
Keyword(s):  
Direct Development ◽  
Phylogenetic Systematics ◽  
Egg Brooding

Cleavage and gastrulation in the egg-brooding, marsupial frog, Gastrotheca riobambae

Development ◽  
1985 ◽  
Vol 90 (1) ◽  
pp. 223-232
Author(s):  
Richard P. Elinson ◽  
Eugenia M. Del Pino
Keyword(s):  
Vital Staining ◽  
Yolk Sac ◽  
Small Cells ◽  
Size Difference ◽  
Animal Pole ◽  
Embryonic Disc ◽  
Slow Development ◽  
Vegetal Pole ◽  
Egg Brooding ◽  
Marginal Region

The marsupial frog Gastrotheca riobambae has several reproductive adaptations, most prominent of which is the incubation of the embryo in a pouch on the mother's back. We have followed cleavage and gastrulation by microscopical observation and by vital staining, and have found several alterations in these processes which may reflect the reproductive adaptations. The large, yolky egg has a cap of yolk-poor cytoplasm at the animal pole which is incorporated into a translucent blastocoel roof consisting of a single cell layer. The epithelium of the yolk sac is derived from the roof. The inconspicuous blastoporal lips form near the vegetal pole from cells of the marginal region. Gastrulation movements include the epibolic stretching of the surface towards the blastopore and a contraction of the vegetal surface. The blastoporal lips close over a small archenteron, and the cells of the lips become the embryonic disc, a discrete group of small cells which give rise to most of the embryo's body. The great size difference between animal and vegetal blastomeres during cleavage, the single-celled blastocoel roof, the dissociation in time between archenteron formation and its expansion, the embryonic disc and the slow development distinguish G. riobambae embryos from those of other frogs. The importance of the marginal region which produces the embryonic disc and the unimportance of the most animal region whose fate is primarily yolk sac emphasizes the role of the marginal region in amphibian development.

Evidence for egg brooding and parental care in icefish and other notothenioids in the Southern Ocean

2006 ◽  
Vol 18 (2) ◽  
pp. 223-227 ◽  
Author(s):  
K.-H. Kock ◽  
L.K. Pshenichnov ◽  
A.L. Devries
Keyword(s):  
Southern Ocean ◽  
Parental Care ◽  
Incubation Period ◽  
Fish Species ◽  
Ross Sea ◽  
Antarctic Fish ◽  
Size And Shape ◽  
Relative Fecundity ◽  
Egg Carrying ◽  
Egg Brooding

One of the least known Antarctic fish species is the icefish Chionobathyscus dewitti described first in 1978. Some of its reproductive characteristics appear to be similar to other channichthyids of similar size and shape. Females close to spawning have gonado–somatic indices (GSIs) of more than 20, and absolute fecundity was 2967 to 15612 oocytes in females 33–62 cm long. Relative fecundity was 7.6 in one female. Spawning has been observed in the Ross Sea at 1300 to 1500 m depth from January to March. Chionobathyscus dewitti may exhibit a remarkable egg carrying behaviour: eggs stick together in batches around the pelvic fins of females. The comparatively large number of mature males observed with no indication of an egg batch attached to their ventral fins makes it unlikely that males are involved in egg carrying. The few larvae of C. dewitti caught so far occurred from October onwards. Their size indicates that they have hatched as early as September. This suggests an incubation period of at least six months. We compare this with parental care reported in other notothenioids.

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