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2008, Biology Letters
In many arthropods, such as bushcrickets, males donate protein-rich nuptial gifts—so-called spermatophores—to females, which females ingest while the sperm enter the female's reproductive tract. Previously, it was shown that females route spermatophore nutrients over the course of hours and days to egg production or body synthesis. We investigated whether female bushcrickets fuel their metabolism with spermatophores immediately after consumption. We fed two male groups diets that were either enriched or depleted in 13 C, and then tracked the isotopic changes in exhaled breath in female bushcrickets after spermatophore consumption. Within 3 hours, the stable carbon isotope ratio ( δ 13 C) of female breath converged on the ratio of the male donor of the nuptial gift. This supports the idea that females quickly routed nutrients to metabolism, receiving immediate benefits from spermatophore feeding.
Animal Behaviour
Material benefit of mating: the bushcricket spermatophylax as a fast uptake nuptial gift2016 •
Physiology & Behavior
Amino acid composition of the bushcricket spermatophore and the function of courtship feeding: Variable composition suggests a dynamic role of the nuptial gift2015 •
Nuptial gifts are packages of non-gametic material transferred by males to females at mating. These gifts are common in bushcrickets, where males produce a complex spermatophore consisting in a sperm-containing ampulla and an edible sperm-free spermatophylax. Two non-mutually exclusive hypotheses have been suggested to explain the function of the spermatophylax: the paternal investment hypothesis proposes that it represents a male nutritional investment in offspring; the mating effort hypothesis proposes that the spermatophylax maximizes the male's sperm transfer. Because gift production may represent significant energy expenditure, males are expected to adjust their investment relative to the perceived quality of the female. In this study, we first examined the free amino acid composition and protein-bound amino acid composition of the nuptial gift in the bushcricket, Ephippiger diurnus (Orthoptera: Tettigoniidae). Second, we investigated whether this composition was altered according to female age and body weight. Our study represents the first investigation of both free and protein-bound amino acid fractions of a bushcricket spermatophylax. We found that composition of the nuptial gift varied both qualitatively and quantitatively with respect to traits of the receiving female: older females received larger amounts of protein-bound amino acids (both essential and non-essential), less water and less free glycine. This result suggests that gift composition is highly labile in E. diurnus , and we propose that gift allocation might represent a form of cryptic male mate choice, allowing males to maximize their chances of paternity according to the risk of sperm competition that is associated with mate quality.
1. During copulation male katydids transfer a protein-rich nuptial gift to females, which is ingested by the female. We hypothesized that female katydids are built at least partly from proteins assimilated from nuptial gifts. 2. We measured the ratio of nitrogen isotopes (δ15N) in the diet and tissue of sexually reproducing Isophya kraussii and obligate parthenogenetically reproducing Poecilimon intermedius. We used the δ15N of muscles as an indicator of the most recent diet and the δ15N of the cuticula as an indicator of the larval diet. 3. In free-ranging I. kraussi, muscular and cuticular δ15N of adult males was low, suggesting a plant diet. Cuticular δ15N did not differ between sexes, indicating that immatures of both sexes fed on similar diets. Female muscles were significantly more enriched in nitrogen-15 than female cuticula and also than male muscles, suggesting that adult females incorporated animal proteins and immature females plant material. 4. Female I. kraussii that were kept with males in captivity had higher δ15N in muscular tissue than in cuticula. Muscular δ15N of these females was also higher than that of muscle and cuticula of females held isolated from males, suggesting that incorporated nitrogen originated from nuptial gifts. 5. In parthenogenetically reproducing P. intermedius muscular and cuticular δ15N was almost identical, suggesting no additional uptake of insect proteins in the absence of nuptial gifts. 6. We therefore conclude that female I. kraussii substantially assimilate spermatophylax compounds for both egg production and body homeostasis. Key-words: Homeostasis, Isophya, nitrogen source, spermatophore, stable isotopes
Proceedings of the Royal Society of London B: Biological Sciences
Protein and carbohydrate intake influence sperm number and fertility in male cockroaches, but not sperm viability2015 •
It is commonly assumed that because males produce many, tiny sperm, they are cheap to produce. Recent work, however, suggests that sperm production is not cost-free. If sperm are costly to produce, sperm number and/or viability should be influenced by diet, and this has been documented in numerous species. Yet few studies have examined the exact nutrients responsible for mediating these effects. Here, we quantify the effects of protein (P) and carbohydrate (C) intake on sperm number and viability in the cockroach Nauphoeta cinerea, as well as the consequences for male fertility. We found the intake of P and C influenced sperm number, being maximized at a high intake of diets with a P : C ratio of 1 : 2, but not sperm viability. The nutritional landscapes for male fertility and sperm number were closely aligned, suggesting that sperm number is the major determinant of male fertility in N. cinerea. Under dietary choice, males regulate nutrient intake at a P : C ratio of 1 : 4.95, which is midway between the ratios needed to maximize sperm production and pre-copulatory attractiveness in this species. This raises the possibility that males regulate nutrient intake to balance the trade-off between pre- and post-copulatory traits in this species.
Physiological and Biochemical Zoology
The Energetics of Trading Nuptial Gifts for Copulations in Katydids2005 •
Australian Journal of Zoology
The Katydid Spermatophore (Orthoptera: Tettigoniidae): Male Nutritional Investment and its Fate in the Mated Female1984 •
ABSTRACT In the katydid Requena verticalis Walker. radioactively labelled protein hydrolysate fed to males is incorporated into various parts of the body, but is more concentrated in the reproductive accessory glands that produce the large spermatophore. The spermatophore consists of two parts, only one of which contains sperm. Both parts are eaten by the female after mating. Females mated to these males had high concentrations of label in their spermathecae; this was most probably derived from label in the storedejaculate. Label in other parts of the body is acquired mainly from nutrients in the spermatophore eaten by the female. Ovaries and immature eggs of females at 3 days post-mating had higher concentrations of male-donated proteins than had somatic tissues, but females at 9-13 days post-mating did not show this difference. However, the older females had developed mature ovarian (and thus unfertil- ized) eggs which did have higher concentrations of label.
Journal of Evolutionary Biology
Macronutrient intake regulates sexual conflict in decorated cricketsSexual conflict results in a diversity of sex-specific adaptations, including chemical additions to ejaculates. Male decorated crickets (Gryllodes sigillatus) produce a gelatinous nuptial gift (the spermatophylax) that varies in size and free amino acid composition, which influences a female’s willingness to fully consume this gift. Complete consumption of this gift maximises sperm transfer through increased retention of the sperm-containing ampulla, but hinders post-copulatory mate choice. Here, we examine the effects of protein (P) and carbohydrate (C) intake on the weight and amino acid composition of the spermatophylax that describes its gustatory appeal to the female, as well as the ability of this gift to regulate sexual conflict via ampulla attachment time. Nutrient intake had similar effects on the expression of these traits with each maximised at a high intake of nutrients with a P:C ratio of 1:1.3. Under dietary choice, males actively regulated their nutrient intake but this regulation did not coincide with the peak of the nutritional landscape for any trait. Our results therefore demonstrate that a balanced intake of nutrients is central to regulating sexual conflict in G. sigillatus but males are constrained from reaching the optima needed to bias the outcome of this conflict in their favour.
During mating, male bushcrickets transfer a spermatophore that consists of a sperm-containing ampulla and a product of the accessory glands, the spermatophylax, which females directly ingest. In the present study, we demonstrate male spermatophore allocation in the bushcricket Poecilimon zimmeri. Males of this species show condition-dependent spermatophore investment. This investment depended upon the age at first mating of males, with older individuals transferring larger spermatophores than younger ones of the same body mass. Independently of age, heavier males transfer larger spermatophores, but the size of males (as measured by femur length) was not a good predictor. Heavier males allocate a lower proportion of their mass to spermatophores and reach their maximal investment point earlier than less heavy males. Spermatophylax production levelled off to a species specific maximum earlier than that of sperm investment (measured as ampulla mass), suggesting that males face high levels of sperm competition.
La formazione della collezione; La storia del Museo. b, dal 1933 ad oggi, in Catalogo del Museo Nazionale Archeologico di Taranto 1,1, Roma 1990, pp. 17-30; 41-60.
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