Reproduction and the Female Reproductive Cycle of Nyctophilus geoffroyi and N. major (Chiroptera: Vespertilionidae) from South-western Australia

1997 ◽  
Vol 45 (5) ◽  
pp. 489 ◽  
Author(s):  
D. J. Hosken
Keyword(s):  
Histological Examination ◽  
Reproductive Cycle ◽  
Western Australia ◽  
Reproductive Cycles ◽  
Reproductive Events ◽  
Vespertilionid Bats ◽  
Female Reproductive Cycle

The reproductive cycles of female Nyctophilus geoffroyi and N. major from south-western Australia are described from capture records and histological examination of tissue from fixed specimens. The sequence of reproductive events for both species was similar to that described for other vespertilionid bats from south- western Australia. Mating commenced between March and May. Sperm were stored in the caudal isthmus of the oviduct and in endometrial glands near the utero-tubal junction. Ovulation and fertilisation occurred in late August or September and twinning was common. Parturition occurred between late October and November, with volant young first captured during December, but it appeared not all N. geoffroyi females were reproductively active every year. Lactation had generally ceased by February, which was when the last detectably juvenile bats were captured.

A comparative account of the reproductive cycles of five species of marine mussels (Bivalvia: Mytilidae) in the vicinity of Fremantle, Western Australia

1967 ◽  
Vol 18 (2) ◽  
pp. 175 ◽  
Author(s):  
BR Wilson ◽  
EP Hodgkin
Keyword(s):  
Reproductive Cycle ◽  
Western Australia ◽  
Marine Species ◽  
Spawning Season ◽  
Latitudinal Distribution ◽  
Marine Mussels ◽  
Reproductive Cycles ◽  
Determining Factor ◽  
Pacific Species

Descriptions are given of the reproductive cycles of five marine species of mussels. Two of these species have a southern Australian distribution and three are tropical Indo-Pacific species or have Indo-Pacific affinities. The reproductive cycles differ significantly, each species exhibiting a characteristic breeding pattern. A distinction is drawn between the season of gametogenic activity and the much narrower season of actual spawning. In four of the species the major features of the reproductive cycle correlate with latitudinal distribution. This is interpreted as evidence supporting the role of temperature as a principal determining factor in the control of broader aspects of the reproductive cycle (i.e. duration and season of gametogenic activity). Differences in finer details of the reproductive cycles (e.g. spawning season and number of spawning peaks) appear to be controlled by unknown factors besides temperature.

Control of the Reproductive Cycle in Female Eulalia Viridis (Polychaeta: Phyllodocidae)

1981 ◽  
Vol 61 (4) ◽  
pp. 941-958 ◽  
Author(s):  
P. J. W. Olive
Keyword(s):  
Reproductive Cycle ◽  
Marine Invertebrates ◽  
Individual Species ◽  
Temperature Cycle ◽  
Polychaete Species ◽  
Cellular Events ◽  
Back Ground ◽  
Reproductive Cycles ◽  
Reproductive Events ◽  
Abundant Data

Eulalia viridis (L.) is one of a group of polychaete species which are being used in an experimental analysis of the regulation of gametogenesis and reproduction. The back-ground to these studies and some of the preliminary results have been discussed recently by Olive (1980). Despite the abundant data demonstrating the frequent occurrence of well-defined reproductive cycles in marine invertebrates and observations on the correlations between reproductive events and environmental conditions, the mechanisms by which the reproductive cycles of individual species are controlled are very poorly understood. It has generally been accepted since the publication of the important paper of Orton (1920) that the temperature cycle in temperate and boreal regions plays an important role in determining the reproductive cycle, but the nature of the control mechanism is not, in general, understood and is likely to vary markedly between species. Environ-mental conditions such as relative daylength or biological factors such as the quantity and identity of the phytoplankton organisms (Himmelman, 1978, 1979) could also play important roles in regulating the sequence of cellular events which culminates in successful reproduction. These general problems have been discussed by Giese (1959) and more recently by Barnes (1975), Giese & Pearse (1975) and specifically in relation to Polychaeta by Clark (1979) and Olive (1980).

Geographic and annual variation in reproductive cycles in the Tasmanian spotted snow skink, Niveoscincus ocellatus (Squamata : Scincidae)

1999 ◽  
Vol 47 (6) ◽  
pp. 539 ◽  
Author(s):  
Erik Wapstra ◽  
Roy Swain ◽  
Susan M. Jones ◽  
Julianne O'Reilly
Keyword(s):  
Reproductive Cycle ◽  
Annual Variation ◽  
Thermal Conditions ◽  
Gestation Length ◽  
Annual Reproductive Cycle ◽  
Climatic Range ◽  
Reproductive Cycles ◽  
Reproductive Events ◽  
Two Populations ◽  
Winter Hibernation

We studied the reproductive cycle of two populations of the spotted snow skink, Niveoscincus ocellatus, over a three-year period. This species is widespread in Tasmania and its distribution overlaps those of other species in the genus that show two distinct reproductive strategies: annual reproduction that is completed within one season, and biennial reproduction in which females carry advanced embryos throughout winter hibernation. We chose populations representative of the climatic extremes of the species’ distribution, within these areas of overlap. Niveoscincus ocellatus maintains the same basic reproductive strategy in both populations: summer gestation, primary autumn mating with obligate sperm storage by females, secondary mating in spring, and predominantly spring vitellogenesis and ovulation. In both populations all females reproduce annually, suggesting that reproductive frequency is not constrained by availability of energy. However, we found distinct differences in the timing of ovulation and parturition. Females from our subalpine site ovulated approximately one month later than those from our warmer, lowland site; parturition was delayed by the same period so gestation length was unchanged. The delay in ovulation results in gestation proceeding over the warmest months at the cold site. The annual reproductive cycle of this species appears to constrain its distribution to the lower altitudinal/climatic range of alpine Niveoscincus species. There were minor annual differences in the timing of reproductive events at each site, which we attribute to variation in thermal conditions and the amount of precipitation.

Reproductive cycle and sperm storage of female coral snakes, Micrurus corallinus and Micrurus frontalis

2020 ◽  
Vol 41 (1) ◽  
pp. 13-27 ◽  
Author(s):  
Erick Augusto Bassi ◽  
Rafaela Zani Coeti ◽  
Selma Maria de Almeida-Santos
Keyword(s):  
Reproductive Cycle ◽  
Sperm Storage ◽  
Reproductive Period ◽  
Long Term Storage ◽  
Ovulatory Period ◽  
Reproductive Cycles ◽  
Reproductive Events ◽  
Autumn And Winter ◽  
First Time

Abstract We analyzed the hypothesis that the lack of synchronization between the mating and ovulation period of Micrurus frontalis (BRT clade) is indicative of the capacity of females to store sperm. Conversely, since these reproductive events occur in the same season for Micrurus corallinus (BRM clade), sperm storage is not expected. Thus, we analyzed the reproductive cycle of female M. corallinus and M. frontalis, and investigated the occurrence of sperm storage. Our results showed that these two species of coral snakes (clades BRM and BRT) possess different reproductive cycles. Micrurus frontalis exhibits an extensive reproductive period encompassing three seasons (summer, autumn and winter), while M. corallinus directs secondary vitellogenesis and ovulation to the hottest period of the year (spring and summer). We confirm, for the first time, the strategy of sperm storage (SSr) in females of the genus Micrurus. We observed sperm storage receptacles located in the non-glandular uterus in all seasons of the year for M. corallinus and in spring, summer and autumn in M. frontalis. Furthermore, the presence of SSr in females in the non-reproductive (post-ovulatory) period, the verification of myoid cells around the receptacles and secretion of neutral carbohydrates in the lumina of SSrs may indicates a long-term storage. The posterior infundibulum is another possible region of sperm storage by the presence of tubular ciliated gland; however, reproductive studies with other species of the genus are necessary for a better understanding of the reproductive strategies of the BRT and BRM clades.

scholarly journals Additional Notes on the Reproduction of the Formosan Grass Lizard, Takydromus formosanus (Boulenger, 1894) (Squamata: Lacertidae), from Southwestern Taiwan

2016 ◽  
Vol 23 (1) ◽  
pp. 28-31
Author(s):  
Gerrut Norval ◽  
Jean-Jay Mao ◽  
Stephen R. Goldberg ◽  
Shao-Chang Huang
Keyword(s):  
Histological Examination ◽  
Reproductive Biology ◽  
Reproductive Cycle ◽  
Ad Hoc ◽  
Areca Catechu ◽  
Southwestern Taiwan ◽  
Female Reproductive Cycle

We collected 13 (male = 2; female = 10; juvenile = 1) Takydromus formosanus on an ad hoc basis from a Betelnut Palm (Areca catechu) plantation in Santzepu, Sheishan District, Chiayi County, as part of a herpetofaunal survey of the area. The smallest reproductively active female had a snout-vent length (SVL) of 44mm, and the smallest male with an enlarged tail base had a SVL of 41 mm. A histological examination and oviposition indicated that the female reproductive cycle commences in April and lasts until at least June. We recorded no clutch sizes greater than two eggs. Takydromus formosanus is a poorly studied species, and many aspects of the reproductive biology of this species merit further research.

The Female Reproductive Cycle of the Indian Monitor Lizard, Varanus monitor

Copeia ◽  
1976 ◽  
Vol 1976 (2) ◽  
pp. 256 ◽  
Author(s):  
Dennis Jacob ◽  
L. S. Ramaswami
Keyword(s):  
Reproductive Cycle ◽  
Monitor Lizard ◽  
Female Reproductive Cycle

A POSSIBLE MECHANISM FOR THE REGULATION OF THE FEMALE REPRODUCTIVE CYCLE IN TENEBRIO MOLITOR (COLEOPTERA: TENEBRIONIDAE)

1967 ◽  
Vol 99 (12) ◽  
pp. 1298-1303 ◽  
Author(s):  
G. H. Gerber
Keyword(s):  
Reproductive Cycle ◽  
Nerve Cord ◽  
Ventral Nerve Cord ◽  
Tenebrio Molitor ◽  
Inhibitory Factor ◽  
Inhibitory Mechanism ◽  
Sequence Of Events ◽  
Coleoptera Tenebrionidae ◽  
Nerve Cords ◽  
Female Reproductive Cycle

AbstractVentral nerve cord severence in newly emerged females of Tenebrio molitor L. resulted in a rate of oocyte production significantly higher than in normal, mated females and much higher than in intact virgins. This suggests that some nervous, inhibitory factor normally controls oocyte production. Mating partially suppresses this inhibitory mechanism, but the higher rate of oocyte production in females with severed nerve cords indicates that the inhibitory mechanism is exercising some control over oocyte production at all times. A sequence of events in the control of oocyte production in Tenebrio is proposed.

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