The choice of oviposition site and the effects of density and oviposition timing on survivorship in <i>Rana japonica</i>

Matsushima, Noe; Kawata, Masakado

doi:10.1007/s11284-004-0010-0

Cited by 30 publications

(13 citation statements)

References 18 publications

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“…Loman (2009) presents a number of plausible explanations: early-hatching tadpoles may suffer less intense intra-and interspecific competition (Loman, 2001;Matsushima and Kawata, 2005) and less severe predation risks than late-hatching tadpoles; by metamorphosing earlier, early-hatching tadpole may reach winter hibernation at a larger size (Altwegg and Reyer, 2003;Loman, 2009) and reach sexual maturity earlier (note that, in our population, some females bred at one year of age); finally, early-breeding females may be able to lay a second clutch in the same breeding season (Silverin and Andren, 1992;Denton and Beebee, 1996), thus increasing the number of offspring produced, as observed in our study.…”

Section: Reproductive Investment Timing Of Deposition and Larval Devmentioning

confidence: 99%

Factors affecting variation in the reproductive investment of female treefrogs, Hyla intermedia

Cadeddu

Castellano

2012

Zoology

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a b s t r a c tIn anurans, fecundity (clutch size) is the most important determinant of female reproductive success. We investigated three possible causes responsible for fecundity variation in female Italian treefrogs, Hyla intermedia, during four breeding seasons: (i) variation in morphological (body size and condition) and life-history (age) traits; (ii) variation in the tradeoff between the number and the size of eggs; (iii) seasonal effects and within-season differences in the timing of deposition. At the population level, we found no evidence for a tradeoff between the number and the size of eggs, because they both correlated positively with females' body size. Conversely, neither age nor post-spawning body condition showed any effect on female reproductive investment. Independent of body size, we found no evidence for variation in reproductive effort among different breeding seasons, but strong evidence for a decrease of clutch size and an increase of egg size with the advancing of a breeding season. To test for the functional significance of the observed temporal variation in allocation strategy, we carried out a rearing experiment in seminatural conditions on a random sample of ten clutches. The experiment showed a negative effect of clutch size and a positive effect of egg size on both tadpole growth and developmental rates, suggesting that reproductive investment, although constrained by body size, can be adjusted by females to the time of deposition to increase the chances of offspring survival.

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Section: Reproductive Investment Timing Of Deposition and Larval Devmentioning

confidence: 99%

Factors affecting variation in the reproductive investment of female treefrogs, Hyla intermedia

Cadeddu

Castellano

2012

Zoology

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“…1, respectively, of Michimae (2006). Some studies have reported that egg mass counts are highly correlated with numbers of larvae in a natural pond, and that the number of egg masses is an accurate indicator of larval density, especially initial larval density (Matsushima and Kawata 2005) if embryonic survival is known. We consider the initial larval density in natural ponds to be especially important for induction of the broad-headed morph because it is usually induced only in larvae within the first week after hatching (Nishihara-Takahashi 1999) and because hatching dates of H. retardatus clutches in the same pond do not vary extremely (personal observation).…”

Section: Study Populationsmentioning

confidence: 99%

Maternal effects on phenotypic plasticity in larvae of the salamander Hynobius retardatus

et al. 2009

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Maternal effects are widespread and influence a variety of traits, for example, life history strategies, mate choice and capacity to avoid predation. Therefore, maternal effects may also influence phenotypic plasticity of offspring, but few studies have addressed the relationship between maternal effects and phenotypic plasticity of offspring. We examined the relationship between a maternally influenced trait (egg size) and the phenotypic plasticity of the induction rate of the broad-headed morph in the salamander Hynobius retardatus. The relationship between egg size and the induction of the broad-headed morph was tested across experimental crowding conditions (densities of low conspecifics, high conspecifics, and high heterospecific anuran), using eggs and larvae from eight natural populations with different larval densities of conspecifics and heterospecifics. The broad-headed morph has a large mouth that enables it to consume either conspecifics or heterospecifics, and this ability gives survival advantages over the normal morph. We have determined that there is phenotypic plasticity in development, as shown by an increase in the frequency of broad-headed morph in response to an increase in the density of conspecifics and heterospecifics. This reaction norm differed between populations. We also determined that the frequency of the broad-headed morph is affected by egg size in which larger egg size resulted in expression of the broad-headed morph. Furthermore, we determined that selection acting on the propensity to develop the broad-headed morph has produced a change in egg size. Lastly, we found that an increase in egg size alters the reaction norm to favor development of the broad-headed morph. For example, an equal change in experimental density produces a greater change in the frequency of the broad-headed morph in larvae developing from large eggs than it does in larvae developing from small eggs. Population differences in plasticity might be the results of differences in egg 3 size between populations, which is caused by the adaptive integration of the plasticity and egg size. Phenotypic plasticity can not evolve independently of maternal effects.

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“…Also, fluvial eightbarbel loaches (Lefua sp.) are known to display territorial behavior (Aoyama and Doi 2006), while Japanese brown frogs (Rana japonica) tend to avoid oviposition sites that have already been occupied by other individuals (Matsushima and Kawata 2005).…”

Section: Discussionmentioning

confidence: 99%

“…Intermediate Egrets are an ideal study species for this purpose because they usually forage in open rice fields in Japan (Lane and Fujioka 1998), allowing detailed observation of both movement paths and prey captures. Intermediate Egrets also prey mainly on various amphibian tadpoles and fish (particularly Oriental weather loach, Misgurnus anguillicaudatus), whose distributions seem to form a spatial structure at both between-field Lane 1997, Fujimoto et al 2008) and within-field scales (Matsushima andKawata 2005, Aoyama andDoi 2006). Egrets may also have to respond to behavioral resource depression ) caused by prey escape behaviors, particularly at a small spatial scale.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical movement decisions in predators: effects of foraging experience at more than one spatial and temporal scale

Amano

Katayama

2009

Ecology

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Animal movements in heterogeneous environments play a crucial role in a variety of ecological processes. Although a hierarchical structure to the scale of movements has been observed in many animal species, few studies to date have revealed what causes such multi-spatial scale movements within the framework of optimal theories. Using detailed information on movement paths and prey captures by Intermediate Egrets in rice fields, this study explored the effects of individual experience at multi-temporal scales on subsequent movement parameters. The results supported three predictions based on optimal foraging theories: (1) movement distances at small and large spatial scales are determined by past foraging experiences over short (one minute) and long (seven to eight minutes) temporal scales, respectively; (2) responses to prey encounters vary between temporal scales, e.g., prey attacks in the previous one minute caused egrets to walk away (i.e., area-avoided search), whereas those in the preceding eight minutes caused egrets to stay around (i.e., area-restricted search); and (3) the probability of patch departure by flying increases with decreasing intake rates in the previous seven minutes, and the quitting intake rate is mostly lower than the long-term average, not including travel time. These results suggest that egrets make different adaptive decisions at different spatial scales: in response to a clumped prey distribution at a large spatial scale, and to a dispersed distribution or behavioral depression of prey at a small spatial scale. This study showed that the framework of optimal foraging theories is useful for comprehensively explaining the different movement modes in animals. It should also be emphasized that considering both area-avoided and restricted searches at multi-temporal scales is important for understanding movement decisions, particularly in organisms searching for hierarchically distributed resources.

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The choice of oviposition site and the effects of density and oviposition timing on survivorship in Rana japonica

Cited by 30 publications

References 18 publications

Factors affecting variation in the reproductive investment of female treefrogs, Hyla intermedia

Factors affecting variation in the reproductive investment of female treefrogs, Hyla intermedia

Maternal effects on phenotypic plasticity in larvae of the salamander Hynobius retardatus

Hierarchical movement decisions in predators: effects of foraging experience at more than one spatial and temporal scale

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