Wyniki wyszukiwania

1

In memoriam. Serge Carreau (1947–2013)

100%

Wolczynski S., Bilinska B.

Reproductive Biology

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2014

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tom 14

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nr 1

2

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Reproductive biology of Unio crassus in the Carpathians

88%

Zajac K., Zajac T.

Folia Malacologica

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2016

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tom 24

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nr 1

3

Selected aspects of reproductive biology of Zonitoides excavatus (Alder, 1830) (Gastropoda: Pulmonata: Gastrodontidae)

75%

Kuznik-Kowalska E., Pokryszko B. M.

Folia Malacologica

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2012

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tom 20

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nr 1

4

Feeding ecology and reproductive biology of some economically important fish species in the Tono Reservoir, Ghana

75%

Akongyuure D. N.

International Letters of Natural Sciences

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2020

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tom 78

The study of feeding ecology and reproductive biology ensures that the right management measures are applied for best output of fish stocks. Selection of good fish species for culture is also made possible through feeding and reproductive studies. Ghana over-relies on the culture of Nile tilapia and African catfish because there is no reliable scientific information on potential fish species that can be included for fish farming. The current study sought to investigate food habits and reproductive characteristics of economically important fish species in the Tono Reservoir of Northern Ghana. Monthly sampling was carried out from January, 2015 to December, 2016 (24 months). Specimens were obtained using cast net and gillnets of varying mesh sizes. Specimens were immediately transported to the laboratory in a chilled iced chest of temperature 4 ◦ C for morphometric measurements and microscopic analysis of gut content and gonads. Thirty-three (33) individual food items were identified from all the fish species. Phytoplankton was the most important diet (Index of Relative Importance, IRI = 1923) whereas zooplankton was the least important diet (IRI = 35) out of the five major categories of food items identified from all the fish species. The major peaks of gonadosomatic index (GSI) of females were noted in February – March and June – July. Over 80 % variation of fecundity was explained by the predictors (standard length, fish weight and gonad weight) for Clarias gariepinus and Auchenoglanis occidentalis. All the fish species were classified as omnivores and they spawned more than once in a year making all of them good candidates for aquaculture. Management measures should focus on regulating agricultural activities close to the reservoir and fishing activities in the reservoir for sustainable fish production and exploitation.

5

A SEM study of Osmunda regalis L. reproductive biology

75%

Zenkteler E., Idzikowska K., Duczmal M.

Bulletin of the Polish Academy of Sciences. Biological Sciences

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1997

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tom 45

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nr 2-4

6

Some observations on the reproductive biology of collared pika Ochotona rufescens Gray, 1842 from Ziarat Valley, Baluchistan, Pakistan

75%

Shafi M. M., Rizvi S. W. A., Pervez A., Ali R., Shah S. Z.

Acta Theriologica

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1992

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tom 37

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nr 4

Some reproductive parameters of collared pika Ochotona rufescens Gray, 1842 were studied during the winter from Ziarat Valley, Baluchistan. Out of 195 animals captured, 105 (53.8%) were males and 90 (46.2%) females. Males were bigger and heavier than non-pregnant females. Mean litter size according to embryo count was 3.6 ± 1.6 (range: 1-7 young/female), and by placental scars 4.48 ± 0.30 (range: 2-6 young/ female). Mean HBL of primiparous females was less than multiparous females. The higher fecundity rate of pika helps to attain its pest status in apple orchards.

7

On the population dynamics, reproductive biology and growth of Succinea putris (Linnaeus 1758) (Gastropoda:Pulmonata: Succineidae)

63%

Kuznik-Kowalska E., Pokryszko B. M., Prockow M., Oczkowska M.

Folia Malacologica

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2013

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tom 21

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nr 4

Selected life-cycle and population parameters of a common Euro-Siberian wetland snail – Succinea putris (L.) – were studied in the field and in the laboratory. In the field the snails reproduced at least from April till September, with April–May and August–September peaks; only one such peak (April) was observed in the laboratory, though the snails reproduced throughout the year. The changes in population size structure in the field and the laboratory results (life span 210–420 days, mean 309) indicated semelparity. Growth in the laboratory included two phases: slow (November–March) and fast (June–October); which phase came first during the life cycle depended on the date of hatching. The growth rate in the field corresponded closely with the fast-phase growth in the laboratory. The smallest reproducing individual was slightly over 2.8 whorls; snails of 3.0 whorls were regularly observed to produce eggs (maximum number of whorls in adults: 4.0). Sexual maturity was attained in ca. 160 days. The eggs (non-calcified, translucent, spherical, 1.7–2.0 mm in diameter) were laid in batches, 5–64 per batch; the eggs within a batch were glued together. The batch dimensions were 3.5–25.7×2.2–24.7 mm. The time to lay a batch was 20–35 minutes. Forty-eight snails produced 74 batches within 12 months. The duration of the egg phase was 11–28 days, which might indicate egg retention of varied duration; hatching was asynchronous, spanning 1–12 days within a batch. The hatchlings had shells of 1.1–1.2 whorls; hatching success was 95%. Neither uniparental reproduction, nor egg or juvenile cannibalism were observed. When compared to data in the literature, our results imply that Succinea putris displays substantial local variation in life-cycle traits.We also provide an overview table to discuss similarities and adaptive radiation in the European succineid species.

8

The morphology and morphometry of the epididymis in the greater cane rat (Thryonomys swinderianus Temmincks)

63%

Adebayo A. O., Olurode S. A.

Folia Morphologica

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2010

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tom 69

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nr 4

The structure and morphometry of the epididymis in the greater cane rat were studied in this work. In assessing the morphology and characterising the morphometric values, a total of 15 adult male greater cane rats, bred and raised in captivity, were used. All the animals had brownish perineal staining, which was taken as index of sexual maturity in male cane rats, and they were maintained on elephant grass stems with water given ad libitum. From this work, the epididymis of the greater cane rat was observed to have a mean weight of 0.0365 ± 0.091 g, forming about 0.016% of the total body weight and an average volume of 0.36 ± 0.08 mL. There was a positive correlation between the epididymal weights, testicular weight, and the body weight in this animal. However, the gross divisions of the epididymis into head, body, and tail were not conspicuous in the cane rat; instead it had two divisions — the cranial and the caudal divisions. In addition, based on the histological and histomorphometric analyses, five zones were observed in the epididymal epithelium of this animal. This preliminary information on the epididymis will serve as a basis for further research on the epididymis of the greater cane rat and will contribute to the knowledge of the its reproductive biology, which will subsequently aid in the captive rearing and domestication of this animal. (Folia Morphol 2010; 69, 4: 246–252)

9

Biometry and reproductive biology of Pseudonereis anomala Gravier 1901 (Polychaeta: Nereididae) on the Alexandria coast, Egypt

63%

Hamdy R., Dorgham M. M., El-Rashidy H. H., Atta M. M.

Oceanologia

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2014

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tom 56

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nr 1

10

Reproduction biology of Helix aspersa under farm conditions

63%

Mach-Paluszkiewicz Z.

Folia Malacologica

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1999

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tom 07

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nr 4

11

Reproductive biology of the endangered percid Zingel asper in captivity: a histological description of the male reproductive cycle

63%

Chevalier C., de Conto C., Exbrayat J.-M.

Folia Histochemica et Cytobiologica

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2011

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tom 49

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nr 3

12

Aspects of the reproductive biology of black-striped pipefish Syngnathus abaster Risso, 1827 (Actinopterygii: Syngnathidae) in the Zaporizke Reservoir, Ukraine

63%

Marenkov O.

International Letters of Natural Sciences

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2017

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tom 66

Black-striped pipefish Syngnathus abaster Risso, 1827 (Actinopterygii: Syngnathidae) has successfully spread in freshwater ecosystems of Ponto-Caspian basin. Monitoring studies show a steady increase in the number and biomass of pipefish in waters of Dnipro region. It is highly adaptable and breeds in a fresh water. This fact indicates the physiological plasticity of the reproductive system and ability to adapt to new environmental conditions. In the Zaporizke Reservoir pipefish spawns at a temperature of 18.0–22.0°C in the coastal area of the reservoir. Pipefish with a body length of 8.9 to 12.5 cm had gonads with weight of about 0.13 g, and the number of eggs ranged from 26 to 68. The maximum fertility had female 155 mm long and it reached 69 eggs. Size of eggs reached about 1.2±0.05 mm. The histological analysis of the gonads of pipefish and research of histometric measurements of eggs of fish at various stages of development was first conducted. In the period before pipefish spawning, there were eggs in different stages of maturity in the ovaries: oocyte in the phase of primary follicle «С», oocyte in the phase of vacuolation «D₃», oocyte in the phase of trophoplasmatic growth «Е», beginning phase of mature follicle «F». Research of pipefish reproduction has important theoretical and practical significance for resolving issues with the spread of this species and its adaptation to new conditions.

13

Reproductive biology and quantity evaluation of the Black-striped pipefish Syngnathus abaster (Eichwald, 1831) in the Zaporozhian Reservoir

63%

Fedonenko O., Marenkov O., Stromenko A., Kolesnik N.

International Letters of Natural Sciences

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2016

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tom 52

The article presents the results of biology and ecology studies about the black-striped pipefish Syngnathus abaster (Eichwald, 1831) in the Zaporozhian Reservoir. Quantity and biomass of fish fingerlings and yearlings in different parts of the reservoir was determined. For the first time the reproductive indicators of pipefish in Zaporozhian Reservoir were investigated: the timing of spawning, fish fertility analysis, information on the number of embryos in the brood chamber of males were shown.

14

The reproductive biology of selected taxa of the genus Cerasus Duham

63%

Chudikova R., Durisova L., Baranec T., Jun. P. E.

Acta Biologica Cracoviensia. Series Botanica

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2012

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tom 54

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nr 2

We used cytological and embryological methods to study reproductive cycle stages in Cerasus fruticosa Pall., Cerasus × eminens (Beck) Buia and Cerasus × mohacsyana (Kárpáti) Janchen from SW Slovakia, focusing on development of the male and female reproductive organs, fertilization processes and embryo formation. We found that reproductive potential was reduced by synergistic effects of negative biotic and abiotic factors. Despite the presence of degenerated, deformed pollen grains and their great variability of shape and size, a sufficient amount of normally developed viable pollen grains developed in anthers of C. fruticosa and C. × mohacsyana. Disturbed microsporogenesis in C. × eminens led to significantly lower production of viable pollen grains. We did not observe serious disturbances during megasporogenesis and megagametogenesis. Lower fruit set was caused by degeneration of ovules as a result of unsuccessful pollination, fertilization failure, or embryo degeneration during its initial development.

15

Porcine pregnancy-associated glycoprotein family [pPAGs] - as in vitro-produced chorionic ligands for luteal and uterine gonadotropin receptors

63%

Szafranska B., Panasiewicz G., Majewska M.

Reproductive Biology

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2006

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tom 06

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nr Suppl.1

16

The reproductive biology of Eudiplozoon nipponicum [Monogenea, Diplozoidae], a parasite of carp [Cyprinus carpio L.] in Europe

63%

Simkova A., Gelnar M., Zurawski T. H.

Wiadomości Parazytologiczne

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1998

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tom 44

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nr 3

17

Preliminary reports of reproductive biology studies in some Crataegus species from Slovakia

63%

Baranec T., Durisova L., Kostal L.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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1999

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tom 41

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nr 1

18

The effect of long term exposure to copper on physiological condition and reproduction of sheep

63%

Murawski M., Bydlon G., Sawicka-Kapusta K., Wierzchos E., Zakrzewska M., Wlodarczyk S., Molik E., Zieba D.

Reproductive Biology

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2006

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tom 06

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nr Suppl.1

19

Confocal microscopy: principles and applications to the field of reproductive biology

63%

Reynaud K., Nogueira D., Cortvrindt R., Kurzawa R., Smitz J.

Folia Histochemica et Cytobiologica

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2001

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tom 39

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nr 2

20

The influence of polychlorinated biphenyls [PCBs] and phytoestrogens in vitro on functioning of reproductive tract in cow

63%

Kotwica J., Wrobel M., Mlynarczuk J.

Reproductive Biology

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2006

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tom 06

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nr Suppl.1

Ograniczanie wyników

In memoriam. Serge Carreau (1947–2013)

Reproductive biology of Unio crassus in the Carpathians

Selected aspects of reproductive biology of Zonitoides excavatus (Alder, 1830) (Gastropoda: Pulmonata: Gastrodontidae)

Feeding ecology and reproductive biology of some economically important fish species in the Tono Reservoir, Ghana

A SEM study of Osmunda regalis L. reproductive biology

Some observations on the reproductive biology of collared pika Ochotona rufescens Gray, 1842 from Ziarat Valley, Baluchistan, Pakistan

On the population dynamics, reproductive biology and growth of Succinea putris (Linnaeus 1758) (Gastropoda:Pulmonata: Succineidae)

The morphology and morphometry of the epididymis in the greater cane rat (Thryonomys swinderianus Temmincks)

Biometry and reproductive biology of Pseudonereis anomala Gravier 1901 (Polychaeta: Nereididae) on the Alexandria coast, Egypt

Reproduction biology of Helix aspersa under farm conditions

Reproductive biology of the endangered percid Zingel asper in captivity: a histological description of the male reproductive cycle

Aspects of the reproductive biology of black-striped pipefish Syngnathus abaster Risso, 1827 (Actinopterygii: Syngnathidae) in the Zaporizke Reservoir, Ukraine

Reproductive biology and quantity evaluation of the Black-striped pipefish Syngnathus abaster (Eichwald, 1831) in the Zaporozhian Reservoir

The reproductive biology of selected taxa of the genus Cerasus Duham

Porcine pregnancy-associated glycoprotein family [pPAGs] - as in vitro-produced chorionic ligands for luteal and uterine gonadotropin receptors

The reproductive biology of Eudiplozoon nipponicum [Monogenea, Diplozoidae], a parasite of carp [Cyprinus carpio L.] in Europe