Reproductive Season, Clutch Parameters and Oocyte Size of the Johnny Darter Etheostoma nigrum from Southwestern Mississippi

1991 ◽  
Vol 125 (2) ◽  
pp. 180 ◽  
Author(s):  
Jeffrey D. Parrish ◽  
David C. Heins ◽  
John A. Baker
Keyword(s):  
Reproductive Season ◽  
Oocyte Size ◽  
Johnny Darter

scholarly journals Expression of Apoptosis-Related Genes in Cat Testicular Tissue in Relation to Sperm Morphology and Seasonality—A Preliminary Study

Animals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 489
Author(s):  
Sylwia Prochowska ◽  
Agnieszka Partyka ◽  
Wojciech Niżański
Keyword(s):  
Sperm Morphology ◽  
Semen Quality ◽  
Testicular Tissue ◽  
Reproductive Season ◽  
Tissue Samples ◽  
Protein Levels ◽  
Expression Of Genes ◽  
Testicular Regression ◽  
Preliminary Study ◽  
Apoptotic Genes

Apoptosis is a crucial process in spermatogenesis, responsible for the elimination of abnormal sperm cells and testicular regression out of breeding season. The aim of this study was to assess if the expression of apoptosis-related genes in testicular tissue of domestic cats differed: (1) between normozoospermic and teratozoospermic donors, and (2) between reproductive and non-reproductive season. The expression of genes: BCL2L1, BCL2, BAX, BAD, FAS, FASLG, and caspases (CASP3, CASP8, CASP9, and CASP10) was analyzed by qRT-PCR in testicular tissue samples. During non-reproductive season significantly higher expression of two anti-apoptotic genes (BCL2L1 and BCL2) was observed. Additionally, there was a significant higher expression of CASP10 in teratozoospermic cats during non-reproductive than during reproductive season. No differences were noted between normozoospermic and teratozoospermic groups. Upregulation of some genes during the non-reproductive season indicates engagement of apoptotic mechanisms in the seasonal changes of semen quality in cats, however further studies on protein levels and analysis of changes on distinct testicular germinal layers are required. At the same time, teratozoospermia in the general population of cats seems to be not connected with dysregulation of apoptosis in the testes.

scholarly journals Land-snail eggs as a proxy of abrupt climatic cooling events during the reproductive season

2021 ◽  
Author(s):  
Fengjiang Li ◽  
Naiqin Wu ◽  
Yajie Dong ◽  
Dan Zhang ◽  
Yueting Zhang ◽  
...  
Keyword(s):  
Land Snail ◽  
Reproductive Season ◽  
Climatic Cooling

Multiple paternity in Chinese alligator (Alligator sinensis) clutches during a reproductive season at Xuanzhou Nature Reserve

2010 ◽  
Vol 31 (3) ◽  
pp. 419-424 ◽  
Author(s):  
Xiao-Bing Wu ◽  
Yun Hu
Keyword(s):  
Dna Markers ◽  
Nature Reserve ◽  
Natural Populations ◽  
Multiple Paternity ◽  
Reproductive Season ◽  
Null Alleles ◽  
Chinese Alligator ◽  
Microsatellite Dna Markers ◽  
Alligator Sinensis ◽  
Allele Assignment

AbstractPaternity testing was determined in Chinese alligator (Alligator sinensis) clutches during a reproductive season at Xuanzhou Nature Reserve, using five microsatellite loci. DNA from ten mother and offspring clutches was analysed to identify paternal alleles. Three or four paternal alleles were observed among three of ten clutches. These clutches were sired by at least two different males. This present study confirmed the effectiveness of microsatellite DNA markers in detecting multiple paternity within natural populations of Chinese alligator. However, to reduce the confounding effects of mutations and null alleles on allele assignment and to increase power to monitor individual's genetic contribution, we need additional variable genetic markers.

Mourning Dove Movements during the Reproductive Season in Southeastern Idaho

1988 ◽  
Vol 52 (3) ◽  
pp. 477 ◽  
Author(s):  
Frank P. Howe ◽  
Lester D. Flake
Keyword(s):  
Reproductive Season ◽  
Mourning Dove

Effect of Maternal Size, Reproductive Season and Interannual Variability in Offspring Provisioning of Carcinus maenas in a Coastal Lagoon

2017 ◽  
Vol 40 (6) ◽  
pp. 1732-1743 ◽  
Author(s):  
Felisa Rey ◽  
M. Rosário M. Domingues ◽  
Pedro Domingues ◽  
Rui Rosa ◽  
María D. M. Orgaz ◽  
...  
Keyword(s):  
Interannual Variability ◽  
Coastal Lagoon ◽  
Carcinus Maenas ◽  
Reproductive Season ◽  
Maternal Size

scholarly journals Intertidal life: field observations on the clingfish Gobiesox barbatulus in southeastern Brazil

2011 ◽  
Vol 9 (1) ◽  
pp. 233-240 ◽  
Author(s):  
Tiago H. S Pires ◽  
Fernando Z Gibran
Keyword(s):  
Developmental Stages ◽  
Feeding Activity ◽  
Single Layer ◽  
Egg Laying ◽  
Reproductive Season ◽  
Feeding Habit ◽  
Southeastern Brazil ◽  
Field Observations ◽  
Nocturnal Feeding ◽  
Particulate Feeding

The clingfish Gobiesox barbatulus shows nocturnal feeding activity, spending most part of the day stationary and adhered to the inferior part of stones. To feed, this species uses the sit-and-wait and particulate feeding tactics. It shows a carnivorous feeding habit mostly consuming small benthic crustaceans. It can move in two ways: (1) "stone-by-stone", sliding its ventral sucker disc across each stone and (2) "surf", when it takes advantage of the energy of the ebbing tide to quickly cross a distance up to four times its body length. Its reproductive season occurs between the end of spring and the beginning of summer, during which time it lays about 2,000 adhesive eggs of 1 mm each in a single layer under stones. It has more than one egg-laying session per reproductive season, therefore showing several different developmental stages. It performs fanning, mouthing and guarding of the eggs as forms of parental care. Data shown here also indicates that G. barbatulus has some shelter fidelity, being probably territorial.

Age, Growth and Sex Ratio of the Azorean Rock-Pool Blenny, Parablennius Sanguinolentus Parvicornis

1995 ◽  
Vol 75 (3) ◽  
pp. 751-754 ◽  
Author(s):  
Ricardo Serrão Santos ◽  
Richard D. M. Nash ◽  
Stephen J. Hawkins
Keyword(s):  
Sex Ratio ◽  
Growth Function ◽  
Early Growth ◽  
Reproductive Season ◽  
First Year ◽  
Von Bertalanffy ◽  
Rock Pool ◽  
Total Length ◽  
Von Bertalanffy Growth Function ◽  
One Year

The age and population structure of Parablennius sanguinolentus parvicornis (Valenciennes) (Pisces: Blenniidae) from the Azores have been studied. Total length and weight relationships are given for each sex. Age study was based on otoliths readings. The von Bertalanffy growth function was applied to describe the growth in total length with age. At the end of the first year mean (±SD) total length was significantly different in males (7.1 ±1.5 cm) and females (6.1 ±1.2 cm). One-year-old males participate in reproduction as satellites, whereas females do not. The implications of this in early growth rate of the males is discussed. During the two most important months of the reproductive season (i.e. June and July), the sex ratio was significantly biased towards males, particularly in the larger size classes.

scholarly journals Spawning season, recruitment and early life distribution of Anchoa tricolor (Spix and Agassiz, 1829) in a tropical bay in southeastern Brazil

2008 ◽  
Vol 68 (4) ◽  
pp. 823-829 ◽  
Author(s):  
FG. Araújo ◽  
MA. Silva ◽  
MCC. Azevedo ◽  
JNS. Santos
Keyword(s):  
Early Life ◽  
Gonad Development ◽  
Late Summer ◽  
Sandy Beaches ◽  
Reproductive Season ◽  
Southeastern Brazil ◽  
Life Distribution ◽  
Beach Seine ◽  
Spawning Period ◽  
Fishery Resource

The pattern of the use of the Sepetiba Bay, a semi-closed 450 km² area in southeastern Brazil, by Anchoa tricolor was investigated to assess spawning period, recruitment and to detect spatial-temporal patterns of this major fishery resource. Fishes were sampled by seine nets, from spring, 1998 to winter, 1999 and by beach seine, from spring, 1998 to winter, 2000. Reproductive season, measured in terms of GSI, gonad development and appearance of recruits, indicate that reproduction occurs from August to March, when they reach the best condition. Recruitment peaks in winter/spring at sandy beaches where they stay until late summer, moving toward deeper bay areas during autumn. After that, they join adults and perform movements between the bay and the adjacent continental shelf to reproduce.

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