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Dylan Morris
Dylan Morris

Natural Mature Sex

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Blue crabs Callinectes sapidus (Rathbun, 1896) > 100 mm carapace width were sampled from a constructed oyster reef (1996 and 1997), a sand bar (1997) and a natural oyster bar (1997) in the Piankatank River, Chesapeake Bay, USA to describe habitat use, sex ratios, and demographics across a gradient of habitat types. Patterns of blue crab catch-per-unit-effort (CPUE), and demographics were similar on the oyster reef in 1996 and 1997. Average annual CPUE on the reef was 6-8 crabs pot(-1) with maximum CPUE of 15 crabs pot(-1). Daylength and water temperature significantly affected reef CPUE with more crabs observed in late August and early September. In 1997, average annual CPUE at the natural oyster bar was higher (9 crabs pot(-1)) than on the reef or the sand bar (both 6-7 crabs pot(-1)). Observed differences in habitat use may relate to site-specific differences in depth and tidal current as well as the presence of living oyster (biogenic) substrate. A transition in the sex ratio of crabs was observed as daylength declined seasonally. In May, males were 3-5 times more abundant than females at all sites but by early September, as daylength and water temperatures declined, female crabs were 3-4 times more abundant than males at all sites. The median size of males and females increased from spring into summer and female crabs were typically larger than males from the same habitats across all habitat types. The largest female crabs were observed in habitats with oysters. Biogenic oyster habitats are important estuarine habitats for blue crabs as well as oysters.

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ABSTRACT: The aim of this study was to analyze the effects of parents on maturation and reproductive activity of spring-born females in fenced populations of Calomys musculinus, at the beginning of the breeding period. The field study was carried out in four 0.25-ha enclosures (two control and two experimental), each situated on natural pasture. This study had two periods: 1) Absence of fathers (AF) (from September 2003 to January 2004), and 2) Absence of mothers (AM) (from October 2004 to February 2005). In both periods, in control enclosures both parents remained with the offspring. During AF period, in experimental enclosures only the mothers remained with their offspring. In AM period, only the adult males remained with their offspring in experimental enclosures. Three trapping sessions of 8 successive nights every fortnight were carried out. Sexual maturation and reproductive activity of spring-born females were compared between treatments using repeated-measures ANOVA. The repeated measures factor was the age of young females. In both periods the number of spring-born females in each reproductive condition was independent of treatments. The females matured according to their physiological times (30-40 days of age). The removal of fathers and mothers did not affect either the timing of sexual maturation or the reproduction of C. musculinus spring-born females. Future research to test the effect of adult female density on juveniles should be done to test the same parameters.

Calomys musculinus is the dominant rodent species of central and north-western Argentina, and the reservoir of Junin virus, the etiological agent of Argentine hemorrhagic fever (AHF) (Mills and Childs, 1998). It inhabits Pampean agrarian ecosystems and is found in a variety of habitats including natural pastures, crop-field edges, cultivated fields undisturbed after harvest, border areas protected by wire enclosures with little agricultural disturbance, roadsides, and railway banks (Busch et al., 2000). C. musculinus populations are characterized by seasonal density changes, with low density during winter (16 mice/ha) and peaks during summer or early autumn (260 mice/ha) (Mills et al., 1991, 1992). The reproductive period of this species begins in mid-September and finishes at the end of April (Mills et al., 1998). C. musculinus has a short gestation length (21 days) and each female can produce many pups in her lifetime (6 pups per litter). Females show a high frequency of postpartum estrus, which implies that a new pregnancy may overlap with the lactation of the previously produced litter (Mills et al., 1992; Buzzio and Castro-Vasquez, 2002). Juveniles of C. musculinus reach sexual maturity between 30 and 40 days of age, with a mean weight close to 16.5g. (de Villafañe, 1981). In the laboratory, C. musculinus females typically build covered nests, males do not contribute to the construction of the nest, and there is no nest co-habitation by a male-female pair (Yunes et al., 1991). Lactating females display much more aggression towards sexually mature females than towards stranger or familiar males, and the presence of another female near the nest is deleterious for litter survival (Laconi, 1998; Laconi and Castro-Vázquez, 1998; Laconi et al., 2000). During the breeding period, females are territorial and their home ranges are both crossed by transient and by resident males but never by breeding females (Steinmann et al., 2008). On the other hand, males have home ranges that are twice as large as those of females and they fully share them with both sexes and their spatial distribution is strongly influenced by searching for mates (Steinmann et al., 2005, 2008). This spacing behaviour pattern of C. musculinus agrees with a promiscuous mating system (Steinmann et al., 2008). In promiscuous species, in which females typically mate with more than one male during each estrous period, males are expected to evolve large testes relative to their body size (Heske and Ostfeld, 1990). C. musculinus male's testis present an unusual development of Leydig cells, and testosterone levels in plasma higher than monogamous mouse and vole species (Castro-Vázquez et al., 1987; Buzzio and Castro-Vázquez, 2002). The age at which sexual maturation is reached, fecundity and the duration of breeding season are the most important reproductive variables in the determination of rodent population abundances (Dapson, 1979; Mihok et al., 1985; Rodd and Boonstra, 1988). In rodent populations the sexual maturation of juvenile cohorts can be related to the presence of adult animals (Wasser and Barash, 1983; Wolff et al., 2001; Wolff et al., 2002). Thus, the removal of specific segments of rodent populations affects reproduction in younger cohorts (Saitoh, 1981; Gilbert et al., 1986; Rodd and Boonstra, 1988; Pusenius and Viitala, 1993). In promiscuous species, territorial females are generally assumed to have a greater impact on inhibiting juveniles than males, due to the fact that females typically compete for exclusive offspring-rearing space (Wolff, 1993; Bond and Wolff, 1999). Thus, young females that cannot acquire an exclusive breeding site may delay sexual maturation until space becomes available (Wolff, 1997). Delayed sexual maturation or reproductive suppression of juveniles may result from either direct contact with adults generally through their intrasexual intolerant behaviour, or from chemical signals from urine of related or grouped females (Getz et al., 1983; Heise and Rozenfeld, 1999). However, Wolff et al. (2001) did not observe that the presence of mothers suppressed reproduction in their daughters for Microtus ochrogaster and M. pennsylvanicus. Besides, in Calomys venustus (a promiscuous-polygynous South American rodent) Priotto et al. (2006) observed that both juvenile females and males matured in relation to physiological times independently of the presence of adults. The aim of this study was to test the hypothesis that the presence of parents causes a delay in maturation and reproductive activity of spring-born females in fenced populations of C. musculinus, at the beginning of the breeding period. 041b061a72


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