Movement of male<i>Heterozius rotundifrons</i>(Crustacea: Decapoda: Brachyura) depends upon local sex ratio

Hazlett, Brian A.; Bach, Catherine E.; Thompson, G. A.; McLay, Colin L.

doi:10.1080/00288330.2005.9517298

Cited by 13 publications

(7 citation statements)

References 8 publications

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“…At low tide, pebble crabs remain partially buried in sand, with movements subject to sex ratio‐dependent factors, and a “freezing” response when disturbed (Taylor & Leelapiyanart ; Hazlett et al. ).…”

Section: Discussionsupporting

confidence: 77%

Differential vulnerability to predation in two sympatric whelks is mediated by juvenile traits

Carrasco

Phillips

2012

Invertebrate Biology

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In many taxa, initial differences in offspring size play an important role in mediating subsequent performance; however, the consequences of interspecific variation in size for the performance of co-occurring taxa have been rarely examined. We used the whelks Cominella virgata and C. maculosa, which co-occur on rocky shores throughout their life cycles, to examine the vulnerability of early life-stages to native predators under controlled laboratory conditions. Among all the predators evaluated (the cushion sea star Patiriella spp., the olive rockfish Acanthoclinus fuscus, the oyster borer snail Haustrum scobina, the smooth shore crab Cyclograpsus lavauxi, and the pebble crab Heterozius rotundifrons), hatchlings of both species (C. virgata:~3 mm shell length [SL] and C. maculosa:~1.5 mm SL) were especially vulnerable to the smooth shore crab Cy. lavauxi, the only potential predator in which mortality was greater than in the control treatment. Small shore crabs (~8 mm carapace width [CW]) were unable to eat hatchlings of either whelk species, whereas medium and large shore crabs (~12 and~18 mm CW, respectively) consumed hatchlings of both prey species. Hatchlings of C. virgata were less vulnerable to predation by medium crabs than large ones, and those of C. maculosa were equally vulnerable to both sizes of crabs. In hatchlings of both prey species, shell length and shell thickness increased over time. Two months after hatching, only individuals of C. virgata had reached a size refuge from predation. Our results show that interspecific vulnerability to predators can be mitigated by larger sizes and thicker shells at hatching; nonetheless, our results also suggest that other species-specific factors, such as juvenile growth rate, may also play key roles in determining the vulnerability of hatchling and juvenile snails to shell-crushing predators.Additional key words: direct development, offspring size, performance, Buccinidae Invertebrate Biology 131(3): 187-196.

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Section: Discussionsupporting

confidence: 77%

Differential vulnerability to predation in two sympatric whelks is mediated by juvenile traits

Carrasco

Phillips

2012

Invertebrate Biology

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“…Sex ratios can inXuence many individual-and populationlevel processes (see e.g., Evans and Magurran 1999;Hazlett et al 2005;Steifetten and Dale 2006). Sex ratio variation may arise at diVerent stages in the life cycle, including fertilisation (primary sex ratio), birth (secondary sex ratio) and maturity (tertiary sex ratio).…”

Section: Introductionmentioning

confidence: 99%

Environmental factors influencing adult sex ratio in Trinidadian guppies

2009

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Sex ratios can influence mating behaviour, population dynamics and evolutionary trajectories; yet the causes of natural sex ratio variation are often uncertain. Although secondary (birth) sex ratios in guppies (Poecilia reticulata) are typically 1:1, we recorded female-biased tertiary (adult) sex ratios in about half of our 48 samples and male-biased sex ratios in none of them. This pattern implies that some populations experience male-biased mortality, perhaps owing to variation in predation or resource limitation. We assessed the effects of predation and/or inter-specific resource competition (intraguild predation) by measuring the local catch-per-unit-effort (CPUE) of species (Rivulus killifish and Macrobrachium prawns) that may differentially prey on male guppies. We assessed the effects of resource levels by measuring canopy openness and algal biomass (chlorophyll a concentration). We found that guppy sex ratios were increasingly female-biased with increasing CPUE of Macrobrachium, and perhaps also Rivulus, and with decreasing canopy openness. We also found an interaction between predators and resource levels in that the effect of canopy openness was greatest when Macrobrachium CPUE was highest. Our study thus also reveals the value of simultaneously testing multiple environmental factors that may drive tertiary sex ratio variation.

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“…Although the consequences of sex ratio variation have been studied in detail (Emlen & Oring, 1977; Lawrence, 1987; Hazlett et al , 2005; Magellan & Magurran, 2007), the purpose of this study was to explore some of its causes. Two potential causes of sex‐biased mortality, and therefore ASR variation, are predation and resource limitation (Klein, 1968; Berger & Gompper, 1999; Sommer, 2000).…”

Section: Discussionmentioning

confidence: 99%

“…Sex ratios have a variety of consequences for the ecology and evolution of natural populations. One set of consequences relates to population growth and dispersal (Waage, 1982; Lawrence, 1987; Hazlett et al , 2005). These effects stem from differences between the sexes in reproductive contributions to population growth and to dispersal.…”

Section: Introductionmentioning

confidence: 99%

Environmental factors influencing adult sex ratio in Poecilia reticulata: laboratory experiments

McKellar

Hendry

2011

Journal of Fish Biology

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The potential causes of adult sex ratio variation in guppies Poecilia reticulata were tested in laboratory experiments that evaluated the mortality rates of male and female P. reticulata exposed to potential predators (Hart's rivulus Rivulus hartii and freshwater prawns Macrobrachium crenulatum) and to different resource levels. Poecilia reticulata mortality increased in the presence of R. hartii and M. crenulatum, and low resource levels had an effect on mortality only in the presence of M. crenulatum. Rivulus hartii preyed more often on male than on female P. reticulata, and this sex-biased predation was not simply the result of males being smaller than females. In contrast, no sex-biased mortality was attributable to M. crenulatum or low resource levels.

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Movement of maleHeterozius rotundifrons(Crustacea: Decapoda: Brachyura) depends upon local sex ratio

Cited by 13 publications

References 8 publications

Differential vulnerability to predation in two sympatric whelks is mediated by juvenile traits

Differential vulnerability to predation in two sympatric whelks is mediated by juvenile traits

Environmental factors influencing adult sex ratio in Trinidadian guppies

Environmental factors influencing adult sex ratio in Poecilia reticulata: laboratory experiments

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