scholarly journals The biology of species of Serolis (Crustacea, Isopoda, Flabellifera): reproductive behavior of Serolis polaris Richardson, 1911

1973 ◽  
Vol 22 (0) ◽  
pp. 109-122 ◽  
Author(s):  
Plínio Soares Moreira
Keyword(s):  
Reproductive Behavior ◽  
Escape Behavior ◽  
Copulatory Behavior ◽  
Additional Information ◽  
Adult Females ◽  
Behavioral Aspects ◽  
Full Discussion ◽  
Males And Females ◽  
Copulatory Position

An account based on observations of the reproductive behavior of Serolis polaris is presented. Correlative additional information obtained from the examination of a large number of preserved specimens is discussed. Both the pre-copulatory behavior, and the copulatory position are described. Pre-adult females show sexual escape behavior. The pair of pereopods II are the only clasping appendages utilized in copulation. They are especially morphologically structured to perform this function. Marks, cuts and sores may be produced on the females by the rubbing movements of the clasping pereopods. Experiments show that when mature, males and females do not ingest food. A full discussion of all these behavioral aspects connected with reproduction is provided.

Reproductive behavior

2018 ◽  
Author(s):  
Rachel Olzer ◽  
Rebecca L. Ehrlich ◽  
Justa L. Heinen-Kay ◽  
Jessie Tanner ◽  
Marlene Zuk
Keyword(s):  
Sexual Selection ◽  
Sexual Conflict ◽  
Female Choice ◽  
Reproductive Behavior ◽  
Mating Systems ◽  
Insect Behavior ◽  
Sequential Approach ◽  
Evolutionary Mechanisms ◽  
Anatomy And Physiology ◽  
Males And Females

Sex and reproduction lie at the heart of studies of insect behavior. We begin by providing a brief overview of insect anatomy and physiology, followed by an introduction to the overarching themes of parental investment, sexual selection, and mating systems. We then take a sequential approach to illustrate the diversity of phenomena and concepts behind insect reproductive behavior from pre-copulatory mate signalling through copulatory sperm transfer, mating positions, and sexual conflict, to post-copulatory sperm competition, and cryptic female choice. We provide an overview of the evolutionary mechanisms driving reproductive behavior. These events are linked by the economic defendability of mates or resources, and how these are allocated in each sex. Under the framework of economic defendability, the reader can better understand how sexual antagonistic behaviors arise as the result of competing optimal fitness strategies between males and females.

scholarly journals Natural history of Ctenus medius Keyserling, 1891 (Araneae, Ctenidae) I: observations on habitats and the development of chromatic patterns

2000 ◽  
Vol 60 (3) ◽  
pp. 503-509 ◽  
Author(s):  
C. E. ALMEIDA ◽  
E. F. RAMOS ◽  
E. GOUVÊA ◽  
M. do CARMO-SILVA ◽  
J. COSTA
Keyword(s):  
Life Cycle ◽  
Natural History ◽  
National Park ◽  
Common Species ◽  
Field Observations ◽  
Mata Atlântica ◽  
Adult Females ◽  
History Of ◽  
Males And Females ◽  
Phoneutria Nigriventer

Ctenus medius Keyserling, 1891 is a common species in several spots of Mata Atlântica, however there is a great lack of studies in all aspects of its natural history. This work aims to elucidate aspects of ecotope preference compared to large spiders, and to provide data on the development of chromatic patterns during its life cycle. The observations on the behavior of C. medius were done in the campus of Centro Universitário de Barra Mansa (UBM) by means of observations and nocturnal collections using cap lamps. For observations on the development of chromatic patterns, spiderlings raised in laboratory, hatched from an oviposition of a female from campus of UBM, and others spiderlings collected in field were used. The field observations indicate that: C. medius seems to prefer ecotopes characterized by dense shrub vegetation or herbal undergrowth; Lycosa erythrognatha and L. nordeskioldii seems to prefer open sites; Phoneutria nigriventer seems to prefer shrub vegetation and anthropogenic ecotopes as rubbish hills; Ancylometes sp. seems to prefer ecotopes near streams. Concerning chromatic patterns, it was observed that males and females show well distinct patterns during the last two instars, allowing distinction by sex without the use of a microscope. Through chromatic patterns it was also possible to draw a distinction between C. medius and C. ornatus longer that 3 mm cephalothorax width. 69 specimens of C. medius (males and females) collected in the campus of UBM did not show a striking polymorphism in chromatic pattern, but one among 7 adult females collected in National Park of Itatiaia, showed a distinct chromatic pattern.

An Evaluation of the Hypothesis that Females Are More Susceptible than Males to Lead-induced Haematological Alterations

1989 ◽  
Vol 8 (2) ◽  
pp. 105-109
Author(s):  
R. Ken ◽  
E.J. Calabrese ◽  
R.W. Tuthill
Keyword(s):  
Blood Lead ◽  
Cell Parameters ◽  
Adult Females ◽  
Significant Difference ◽  
Lead Levels ◽  
Human Adults ◽  
Males And Females ◽  
Published Research ◽  
Lead Poisoning Prevention ◽  
Poisoning Prevention

1 A retrospective epidemiological study was conducted to assess the hypothesis that sex differences exist with respect to selected lead-induced red blood cell parameters. The study utilized data previously collected in the Boston Childhood Lead Poisoning Prevention Program. 2 This study revealed no statistically significant difference between males and females ( n = 1548) aged 1-6 years for blood FEP levels when blood lead levels were similar. 3 These findings are in contrast with previously published research with human adults, which has suggested that adult females display significantly greater FEP values at identical blood level values as similarly aged men.

Asperger's and Girls: What Teachers Need to Know

2015 ◽  
Vol 39 (2) ◽  
pp. 128-142 ◽  
Author(s):  
Belinda Jarman ◽  
Christopher Rayner
Keyword(s):  
Quality Of Life ◽  
Pervasive Developmental Disorder ◽  
Asperger's Syndrome ◽  
Developmental Disorder ◽  
School Experiences ◽  
Future Research ◽  
Adult Females ◽  
Average Intelligence ◽  
Males And Females

Individuals with the pervasive developmental disorder Asperger's syndrome (AS) are generally of average or above average intelligence and attend mainstream schools. Despite their intelligence, some of the characteristics and challenges associated with AS can impact upon the quality of life they experience at school. Although both males and females are diagnosed with AS, females have been underrepresented and unrepresented in much of the AS research. Consequently, much of what is known about the school experiences of students with AS is based on studies consisting predominately of male perspectives. This article discusses what adult females with AS and parents of females with AS currently attending school wish teachers understood about AS in females. Many of the experiences described by participants indicate there is a lack of understanding about AS, both generally and specifically, in relation to females. Implications of these findings and recommendations for educators and schools are provided, and directions for future research are outlined.

Growth of the Eastern Quoll, Dasyurus viverrinus (Shaw), (Marsupialia) in Captivity

1984 ◽  
Vol 11 (1) ◽  
pp. 21 ◽  
Author(s):  
JC Merchant ◽  
K Newgrain ◽  
B Green
Keyword(s):  
Litter Size ◽  
Adult Female ◽  
Growth And Development ◽  
Mammary Glands ◽  
Adult Females ◽  
In Captivity ◽  
Molar Teeth ◽  
Males And Females ◽  
At Will

The growth and development, from 10 to 270 days old, of eastern quolls in a captive colony was recorded. Young were able to detach from the teat by 65 days of age and their eyes were open by 80 days. Statistically significant differences in some measurements from males and females were found as early as 85 days of age. The weaning period commenced at 102 days ofage, and coincided with eruption ofthe first molar teeth. Total independence, determined by the cessation of lactation in the mother, was as early as 142 days in litters of one or as late as 200 days in larger litters. There was a high correlation between litter size and age at independence. Lactation was maintained in all previously suckled mammary glands of adult females after the death of young aged 65 days or over if some siblings remained. This was due to the ability of young of this age to detach and reattach to the teats at will. The implication of this observation is that the commonly held view that the numbers of surviving young in marsupial litters corresponds to the number of lactating teats in the adult female may not always be correct.

Mating behavior and acoustic communication of the long-legged cricket Endecous (Notendecous) onthophagus (Berg, 1891) from Southern Brazil (Orthoptera: Grylloidea: Phalangopsidae)

Zootaxa ◽  
2020 ◽  
Vol 4743 (3) ◽  
pp. 427-437 ◽  
Author(s):  
RIULER CORRÊA ACOSTA ◽  
VITOR FALCHI TIMM ◽  
NEUCIR SZINWELSKI ◽  
MARIA KÁTIA MATIOTTI DA COSTA ◽  
EDISON ZEFA
Keyword(s):  
Mating System ◽  
Mating Behavior ◽  
Acoustic Communication ◽  
Copulatory Behavior ◽  
Southern Brazil ◽  
Acoustic Parameters ◽  
Behavioral Diversity ◽  
Guarding Behavior ◽  
Spermatophore Transfer ◽  
Copulatory Position

The courtship, copulation and post-copulatory behavior, as well as acoustic communication of the Neotropical cricket Endecous (Notendecous) onthophagus is described under laboratory conditions and compared with other phalangopsids whose mating system was studied so far. We found that E. onthophagus present predictable mating sequences including seven events: (1) prolonged courtship; (2) male spermatophore extrusion during courtship; (3) female-above copulatory position; (4) prolonged copulation; (5) male forewings flipped over his head, exposing metanotal region along copulation; (6) copulation without spermatophore transfer; and (7) absence of guarding behavior. We suggest these events (1 to 7) as a behavioral line shared by phalangopsids, and we highlight variations that reflect the behavioral diversity of these crickets. The males of E. onthophagus produce the calling song (chirps) to attract females to mate, and also stridulates intermittently during the entire courtship period with distinct acoustic parameters during the stages of pre- and post-spermatophore extrusion. 

scholarly journals The Diet and Sexual Differences of the Caspian Bent-Toed Gecko,Tenuidactylus caspius(Squamata: Gekkonidae), in Northern Iran

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
Vida Hojati ◽  
Reza Babaei Savasari
Keyword(s):  
Sexual Dimorphism ◽  
Culex Pipiens ◽  
Tail Length ◽  
Adult Males ◽  
Northern Iran ◽  
Widespread Distribution ◽  
Adult Females ◽  
Significant Difference ◽  
Males And Females ◽  
Prey Items

The Caspian bent-toed gecko,Tenuidactylus caspius, is one of the most common nocturnal lizards of Iran with widespread distribution especially in the northern provinces. This research was done in order to study the diet and sexual dimorphism of this species in Sari County from 5 May to 20 October. During this research, 40 specimens of them including 20 males and 20 females were studied for diet and 140 specimens including 70 adult males and 70 adult females were studied for sexual dimorphism. Prey items identified were insects that belong to 15 species of 8 families and 6 orders. The most common prey items wereCulex pipiensandMusca domestica. There is no significant difference between diets of males and females. Results show that the adult males in addition of having the apparent femoral and preanal pores are heavier than females and have larger body, head, and tail length.

Movements and cumulative range size of the platypus (Ornithorhynchus anatinus) inferred from mark–recapture studies

2012 ◽  
Vol 60 (5) ◽  
pp. 352 ◽  
Author(s):  
M. Serena ◽  
G. A. Williams
Keyword(s):  
Range Size ◽  
River Catchment ◽  
Young Males ◽  
Adult Females ◽  
Ornithorhynchus Anatinus ◽  
Males And Females ◽  
The Mean ◽  
Western Victoria ◽  
Fyke Nets ◽  
Age And Sex

The extent of mammalian movements often varies with size, sex and/or reproductive status. Fyke nets were set along streams and rivers near Melbourne (southern Victoria) from the mid-1990s to 2007, and in the Wimmera River catchment (western Victoria) from 1997 to 2005, to assess how far platypus of different age and sex classes travelled between captures and over longer periods. The mean distance between consecutive captures of adults did not vary significantly as intervals increased from 1–3 months to >3 years, suggesting that most individuals occupied stable ranges. However, adult females travelled, on average, only 35% as far between captures as males in southern Victoria, and 29% as far in the Wimmera. Up to half of this difference may be explained by variation in size-related metabolic requirements. Immature males and females respectively moved 61% and 53% as far, on average, as their adult equivalents, although two young males dispersed >40 km. Adults incrementally occupied up to 13.9 km of channel in the case of a male (based on six captures over 67 months) and 4.4 km of channel in the case of a female (based on five captures over 127 months).

Bkm satellite DNA and ZFY in the coral reef fish Anthias squamipinnis

Genome ◽  
1991 ◽  
Vol 34 (4) ◽  
pp. 612-617 ◽  
Author(s):  
Stephen Wachtel ◽  
Suzanne Demas ◽  
Terrence Tiersch ◽  
Peter Pechan ◽  
Douglas Shapiro
Keyword(s):  
Satellite Dna ◽  
Recent Observation ◽  
Restriction Enzymes ◽  
W Chromosome ◽  
Adult Females ◽  
Specific Hybridization ◽  
Fingerprint Pattern ◽  
Males And Females ◽  
Male Specific ◽  
Human Y Chromosome

We studied DNA from the protogynous sex-changing fish Anthias squamipinnis to evaluate the recent observation that male-specific bands are identified after hybridization with Bkm, a probe originating in the W chromosome of the snake Bungarus fasciatus. Sex-specific hybridization would imply modification of DNA structure during the sex-changing process. No sex-specific Bkm fragments were identified in our study, after digestion of DNA from 15 males and 11 adult females, despite the use of 12 different restriction enzymes. However, hybridization with Bkm did produce a distinct fingerprint pattern, similar to the fingerprint patterns described for other species after hybridization with GATA (GACA) type probes. In other experiments, the pDP1007 probe, which identifies the ZFY gene in the male-determining region of the human Y chromosome, generated identical hybridization patterns in DNA from males and females of A. squamipinnis and estimation of DNA mass by flow cytometry revealed identical genome sizes.Key words: Bkm satellite DNA, sex determination, sex change, ZFY, pDP1007, genome size.

The effect of non-immune stresses on the development of Strongyloides ratti

Parasitology ◽  
2005 ◽  
Vol 131 (3) ◽  
pp. 383-392 ◽  
Author(s):  
M. CROOK ◽  
M. E. VINEY
Keyword(s):  
Immune Response ◽  
Parasitic Nematode ◽  
Host Immune Response ◽  
Natural Host ◽  
Adult Males ◽  
Free Living ◽  
Developmental Effects ◽  
Adult Females ◽  
Males And Females ◽  
Living Adult

Strongyloides ratti is a parasitic nematode of rats. The host immune response against S. ratti affects the development of its free-living generation, favouring the development of free-living adult males and females at the expense of directly developing, infective 3rd-stage larvae. However, how the host immune response brings about these developmental effects is not clear. To begin to investigate this, we have determined the effect of non-immune stresses on the development of S. ratti. These non-immune stresses were subcurative doses of the anthelmintic drugs Ivermectin, Dithiazanine iodide and Thiabendazole, and infection of a non-natural host, the mouse. These treatments produced the opposite developmental outcome to that of the host immune response. Thus, in infections treated with subcurative doses of Ivermectin, Dithiazanine iodide and in infections of a non-natural host, the sex ratio of developing larvae became more female-biased and the proportion of female larvae that developed into free-living adult females decreased. This suggests that the mechanism by which the host immune response and these non-immune stresses affect S. ratti development differs.

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