Infertile men have been shown to have less zinc than their more fecund brethren.
|
|
The government will then rent the homes to young couples, the more fecund the better.
|
|
Instead, vegetables are trucked in from California, Mexico and other more fecund parts of the world.
|
|
As Stone noted recently on Twitter, by targeting minority and religious populations, Beijing is attacking the country's more fecund groups, in what amounts to a statement that if Han birthrates have fallen, minority birthrates must be cut to match.
|
|
Female size is significantly correlated with ovary weight, and males intensify their courtship rituals for the more fecund females. Research has shown that males that mate with larger females do indeed receive and hatch greater numbers of eggs.
|
|
Female of Brachygastra cooperi, sp. n. A, lateral view; B, dorsal view. Scale bars = 1.0 mm There are obvious morphological caste differences in many species with queens being larger than workers. Additionally, larger queens are generally more fecund and dominant that smaller counterparts.
|
|
Castes and the influence of the colony cycle in swarm-founding polistine wasps. Insectes Sociaux. 49: 62-74. Research has also suggested that the workers have a mechanism for identifying those females who are more fecund and allowing them to identify, and discard, those with less favorable ovaries.
|
|
This allows for egg laying and mating to occur at different times of day, so there is no trade off between the two activities. Male butterflies are polygamous, as well. Polyandrous females are more fecund, due to laying more eggs. A female's eggs are mostly mature when they are laid.
|
|
The reproductive characteristics of the black dogfish, such as a large female maturation size, may render it susceptible to overfishing, though it is more fecund than other deep-sea dogfish sharks. In the northeastern Atlantic, catches of this species are managed as part of the total allowable catch for deep-sea sharks set by the International Council for the Exploration of the Sea (ICES).
|
|
Female Pacific blue- eyes are sexually mature at six months of age or when they have reached in standard length. Males are mature at standard length. A study published in 2003 showed that males will preferentially choose larger females—who are more fecund as a rule—unless more energy is required to do so, such as swimming further against a current. Fish can breed in fresh and salt water.
|
|
From Rahn, H., Sotherland, P. and Paganelli, C. V., 1985. “Interrelationships between egg mass and adult body mass and metabolism among passerine birds” in Journal für Ornithologie 126:263-271. and a clutch of four weighs more than the adult female - a feat equalled only by much more fecund kinglets. Little is known about incubation, fledging periods, or postfledging parental care due to the very secretive nature of the species.
|
|
When sufficiently mature, the terminal proglottids are shed, being expelled from the host with the whale's fæces. Compared with their free-living relatives, parasites tend to be more fecund, and the whale tapeworm is likely to produce billions of eggs during its lifetime. Considering why the worms should have evolved this enormous fecundity, Gerald D. Schmidt and Larry S. Roberts (1977) reflected that "There are few whales and the ocean is large".
|
|
Guppies' body sizes are positively correlated with age, and their size at maturation varies highly depending on the predation risk of their habitats. Male and female guppies from high-predation regions mature faster and start reproducing earlier, and they devote more resources to reproduction than those from low-predation regions. Females from high-predation regions reproduce more frequently and produce more offspring per litter, indicating that they are more fecund than low-predation females. Female guppies' reproductive success is also related to age.
|
|
Stanley Greaves (born 1934)Rupert Roopnarine, "Master Maker: Stanley Greaves", Caribbean Beat, Issue 72 (March/April 2005). is a Guyanese painter and writer who is one of the Caribbean's most distinguished artists. Writing in 1995 at the time of a retrospective exhibition to celebrate Greaves's 60th birthday, Rupert Roopnarine stated: "It may be that no major Caribbean artist of our time has been more fecund and versatile than Stanley Greaves of Guyana."Rupert Roopnarine, "Stanley Greaves of Guyana – A Caribbean Master", El Dorado, April 1995.
|
|
The demographic transition from the late eighteenth century onwards opened up the possibility that significant change could occur within and between political units. Though the writings of Polybius and Cicero in classical times bemoaned the low fertility of the patrician elite as against their more fecund barbarian competitors,Jackson, Richard, and Neil Howe. 2011. "'Global Aging And Global Security In The 21st Century'." in Political Demography: How Population Changes are Reshaping National Politics and International Security, ed. J. A. Goldstone, Eric Kaufmann and Monica Duffy Toft.
|
|
This exploitation of other females is common; eggs are laid in neighbouring egg masses whenever there is opportunity to do so. Egg dumpers were observed to have higher mortality rates per egg, but were at an advantage because they were more fecund (could lay more eggs) and were at lower risk of predation. Some semiochemicals have been identified for this species. For example, larvae emit an alarm pheromone called geraniol from dorsal glands which cause nearby nymphs to flee, which explains earlier observations that nymphs become alarmed when a nearby sibling is crushed.
|
|
When developed, the larvae pupate, undergo metamorphosis and emerge as adult flies. The time from egg-laying to adult emergence averages nine days. The bazaar fly is a prolific species: theoretically, if all its progeny survived, a single female bazaar fly kept at could produce 17.8 million offspring within 11 weeks. The quality of the emerging adult flies (as measured by head breadth) is better from human faeces than from those of any other animal; these larger flies are likely to be more fecund and have longer lives, thus producing more offspring.
|
|
Adult male Zygiella x-notata have been found to be choosy for female mates in high competition environments. Bel-Venner et al. show that under conditions of weak intrasexual competition, males pair opportunistically with females, whereas in highly competitive environments, males selectively guard females according to their own competitive ability. This demonstrated a particular size assortative mating behavior in the differential mating preferences of Z. x-notata males, where large males frequently chose to mate with larger, more fecund females, and smaller males chose to mate with smaller females.
|
|
The limited ecological data on Pomacea maculata in the USA show that the species has considerable impacts, especially on native aquatic vegetation and snail species. In Florida, in particular, Pomacea maculata is much larger and more fecund than the native Pomacea paludosa (that produces 20–30 eggs). Recent laboratory studies have demonstrated that Pomacea maculata can transfer the neurotoxin linked to Avian Vacuolar Myelinopathy (AVM) to its avian predators. The invasion of Pomacea maculata has possibly affected the endangered snail kite, a specialist predator on the native Pomacea paludosa, which seemingly experienced decreased foraging success and juvenile survival following invasion of Pomacea maculata.
|
|
Even though the fecundity of the ablated females may not differ significantly, the hatch rates of ablated females was found to be markedly less (37.8% to 58.1%) than that of unablated females (69.2%). It is also found that wild females are more fecund per unit weight than ablated females. However quantitatively the number of spawns, eggs and nauplii produced by ablated females is ten, eight and six times respectively that of unablated females. The size of females used for broodstock and spawning should preferably be above be and males above , as they mature at approximately and respectively.
|
|
POP Montreal is an annual music festival occurring in Montreal, Quebec, Canada, in the early fall, usually at the end of September or the beginning of October. More than 400 bands are scheduled to play in more than 50 venues across the city, mostly located in the Mile End area. Along with music, POP Montreal has music-related film (Film Pop), art events (Art Pop) as well as a conference (POP Symposium) and a cultural fair called Puces Pop.Dunlevy, T'Cha (September 28, 2009). "A festival more fecund than ever: POP Montreal: New edition holds promise for young and old both", National Post, p. B16.Dunlevy, T'Cha (September 30, 2006).
|
|
The introduced Chilean populations of California poppy appear to be larger and more fecund in their introduced range than in their native range (Leger and Rice, 2003). Introduced populations have been noted to be larger and more reproductively successful than native ones (Elton, 1958), and there has been much speculation as to why. An increase in resource availability, decreased competition, and release from enemy pressure have all been proposed as explanations. One hypothesis is that the plant's resources devoted in the native range to a defense strategy can, in the absence of enemies, be devoted to increased growth and reproduction (the EICA Hypothesis, Blossey & Nötzold, 1995).
|
|
Exposed eggs are typically and readily eaten by other pupfish of the same species if not laid in an inconspicuous area, while mobile fry are ignored unless adults are very hungry. Furthermore, though pupfish may engage in filial cannibalism, males have been observed using olfactory cues to distinguish between eggs fertilized by themselves and those fertilized by other males. This has been considered analogous to the defensive behavior of avian victims of nest parasitism, wherein they will reject alien eggs. Similarly, pupfish eggs are typically only consumed by females that do not spawn them; these two factors, coupled with the fact that males show sexual preference towards larger (and therefore more fecund) females, are consistent with parents maximizing the chances of offspring survival.
|
|
In another insect, Gryllus firmus, short-winged females are more fecund at an early age and have elevated levels of ecdysteroids and juvenile hormones in their hemolymph (a fluid in invertebrates similar to blood), but are less able to disperse than their long-winged counterparts. This shows how hormones can mediate the cost of reproduction: by linking increased reproduction with decreased somatic function (decreased function in the rest of the body). Additionally, the amount of time the juvenile hormone titer (concentration) is above a certain level likely affects the cost of reproduction, as evidenced by the juvenile hormone titer's circadian rhythm in long-winged morphs and constant level in short-winged morphs. The traditional view of the cost of reproduction says that a cost is caused by differential allocation of limited internal resources.
|
|
Whole- plant studies also showed that the xeric and mesic types differed from each other for many characters such as the flag leaf, primary stem height, number of tillers, weight and number of seeds, dry weight, and flowering time, with the mesic ecotype being generally larger and more fecund, overall, than the xeric type; further, the flag leaves of the xeric type were consistently smaller than the mesic type under many conditions. It was further shown that xeric populations that were monomorphic for the seed and leaf sheath characters and allozymes had less genetic variation for quantitative genetics characters than mesic populations; however, quantitative genetic variation existed in all xeric or mesic populations that were studied. Consequently, with all genetic characters studied, xeric populations of the xeric ecotype were more similar to each other than they were to the mesic ecotype, and the evidence indicated that the various ecotypes represented significant linkage disequilibrium and coadapted genetic complexes. For field identification purposes, the leaf sheath pubescence in the seedling stage and lemma color at seed maturity as well as the flag leaf dimensions would reliably separate the xeric from the mesic ecotypes throughout California.
|
|