Seasonal Shifts in Reproduction Depend on Prey Availability for an Income Breeder

Hall, Joshua M.; Buckelew, Andrew; Lovern, Matthew B.; Secor, Stephen M.; Warner, Daniel A.

doi:10.1086/700341

Cited by 15 publications

(13 citation statements)

References 72 publications

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“…Though past studies reveal a seasonal increase in egg size in the laboratory (e.g. Delaney, Lovern, & Warner, ; Hall et al, ; Warner & Lovern, ; but see Fetters & McGlothlin, ), our study was unique because we bred females over the entire season and carefully monitored maternal growth. We are confident that seasonal increases in egg mass were due to shifts in the relative amount of energy allocated to each offspring rather than maternal growth because the relationship between growth and time differed from that between egg mass and time (Figure a,d), and we observed no direct relationship between maternal growth and seasonal changes in egg mass (Figure S4).…”

Section: Discussionmentioning

confidence: 99%

“…monoallochronic ovulation, Smith, Sinelnik, Fawcett, & Jones, 1972). This allows females to adjust the effort among offspring at a fine scale as the environment changes (Hall, Buckelew, Lovern, Secor, & Warner, 2018). Hatchling survival is higher for early-produced individuals than those produced later in the season (Pearson & Warner, 2018), and, accordingly, females invest greater total energy earlier in the season by producing relatively many, smaller offspring and less energy later by producing relatively few, larger offspring (Mitchell et al, 2018;Pearson & Warner, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Adaptive seasonal shift towards investment in fewer, larger offspring: Evidence from field and laboratory studies

Hall

Mitchell

Thawley

et al. 2020

Journal of Animal Ecology

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1. Seasonal changes in reproduction have been described for many taxa. As reproductive seasons progress, females often shift from greater energetic investment in many small offspring towards investing less total energy into fewer, better provisioned (i.e. larger) offspring. The underlying causes of this pattern have not been assessed in many systems.2. Two primary hypotheses have been proposed to explain these patterns. The first is an adaptive hypothesis from life-history theory: early offspring have a survival advantage over those produced later. Accordingly, selection favours females that invest in offspring quantity early in the season and offspring quality later. The second hypothesis suggests these patterns are not intrinsic but result from passive responses to seasonal changes in the environment experienced by reproducing females (i.e. maternal environment).3. To disentangle the causes underlying this pattern, which has been reported in brown anole lizards (Anolis sagrei), we performed complementary field and laboratory studies. The laboratory study carefully controlled maternal environments and quantified reproductive patterns throughout the reproductive season for each female. The field study measured similar metrics from free ranging lizards across an entire reproductive season. 4. In the laboratory, females increased relative effort per offspring as the reproductive season progressed; smaller eggs were laid earlier, larger eggs were laid later. Moreover, we observed significant among-individual variation in seasonal changes in reproduction, which is necessary for traits to evolve via natural selection. Because these patterns consistently emerge under controlled laboratory conditions, they likely represent an intrinsic and potentially adaptive adjustment of reproductive effort as predicted by life-history theory.5. The field study revealed similar trends, further suggesting that intrinsic patterns observed in the laboratory are strong enough to persist despite the environmental variability that characterizes natural habitats. The observed patterns are indicative of an adaptive seasonal shift in parental investment in response to a deteriorating offspring environment: allocating greater resources to late-produced offspring likely enhances maternal fitness. | 1243Journal of Animal Ecology HALL et AL.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adaptive seasonal shift towards investment in fewer, larger offspring: Evidence from field and laboratory studies

Hall

Mitchell

Thawley

et al. 2020

Journal of Animal Ecology

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“…Esto solo tendría sentido si el huracán no presentó la intensidad necesaria para arrastrar los recursos alimenticios de las lagartijas, como se observó tras el paso del huracán Michelle que dañó severamente a los insectos defoliadores que podrían incluirse en la dieta de las lagartijas (Spiller y Schoener, 2007). Una alta productividad del sistema podría influir positivamente en diversos aspectos reproductivos de las lagartijas (Hall et al, 2018;Ramírez-Bautista y Vitt, 1997), induciendo un incremento de sus poblaciones. Por otro lado, la pérdida de árboles pudo conducir a las lagartijas A. nebulosus a usar los árboles que quedaron en pie, por lo que la detección de individuos se pudo incrementar y con ello la densidad estimada, dado que la pérdida de árboles puede incrementar el campo visual del observador.…”

Section: Discussionunclassified

“…Previo a Jova, hubo una reducción de secas a lluvias en las 3 variables, mientras que posterior a Jova sucede lo contrario. Este resultado podría sugerir que el aumento de la precipitación provocado por Jova fue benéfico para el sistema de manera inmediata, incrementando la cantidad del recurso alimenticio (e.g., artrópodos) para las lagartijas, lo que se reflejaría en su reproducción (mejores condiciones reproductivas a mayor productividad; Hall et al [2018]) y condiciones corporales (a mayor productividad del sistema, mayor crecimiento; Brown et al [2017]).…”

Section: Discussionunclassified

Huracán Jova: efecto de un fenómeno meteorológico severo sobre lagartijas insulares en el occidente de México

Garcı́a

Siliceo-Cantero

2019

Rev.Mex.Biodiv.

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“…The brown anole lizard ( Anolis sagrei ), is an excellent model for studies of environmental variability and development (Hall et al, 2019). Protocols for their captive husbandry are established (Sanger et al, 2008a), they are relatively fecund in captivity allowing for robust sample sizes (Hall et al, 2018), and their developmental staging series has been described (Sanger et al, 2008b). Females construct shallow nests across a diversity of habitats; thus, in the wild, embryos experience relatively large thermal variation during incubation (Sanger et al, 2018; Tiatragul et al, 2019) and temperature has important effects on embryo development, egg survival, and hatchling phenotypes (Pearson and Warner 2018).…”

Section: Introductionmentioning

confidence: 99%

Thermal sensitivity of lizard embryos indicates a mismatch between oxygen supply and demand at near-lethal temperatures

Hall

Warner

2019

Preprint

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ABSTRACTAspects of global change (e.g. urbanization, climate change) result in novel, stressful thermal environments that threaten biodiversity. Though much research quantifies the thermal sensitivity of adult organisms, effects of global change on developing offspring (e.g. embryos) are also important. Oviparous, non-avian reptiles have received considerable attention because eggs are left to develop under prevailing environmental conditions, making them vulnerable to increases in ambient temperature. Though many studies assess embryo thermal tolerance and physiology in response to long-term (i.e. chronic), constant incubation temperatures, fewer assess responses to acute exposures which are more ecologically relevant for many species. We subjected eggs of the brown anole lizard (Anolis sagrei) to heat shocks, thermal ramps, and extreme diurnal fluctuations to determine the lethal temperature of embryos, measure the thermal sensitivity of embryo heart rate and metabolism, and quantify the effects of sub-lethal but stressful temperatures on embryo development and hatchling phenotypes and survival. Most embryos died at heat shocks of 45 or 46 °C, which is ∼12 °C warmer than the highest constant temperatures suitable for development. Heart rate and O2 consumption increased with temperature; however, as embryos approached the lethal temperature, heart rate and CO2 production continued rising while O2 consumption plateaued. These data indicate a mismatch between oxygen supply and demand at high temperatures. Exposure to extreme, diurnal temperature fluctuations depressed embryo developmental rates and heart rates, and resulted in hatchlings with smaller body size, reduced growth rates, and lower survival in the laboratory. Thus, even brief exposure to extreme temperatures can have important effects on embryo development, and our study highlights the role of both immediate and cumulative effects of high temperatures on egg survival. Such effects must be considered to predict how populations will respond to global change.

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Seasonal Shifts in Reproduction Depend on Prey Availability for an Income Breeder

Cited by 15 publications

References 72 publications

Adaptive seasonal shift towards investment in fewer, larger offspring: Evidence from field and laboratory studies

Adaptive seasonal shift towards investment in fewer, larger offspring: Evidence from field and laboratory studies

Huracán Jova: efecto de un fenómeno meteorológico severo sobre lagartijas insulares en el occidente de México

Thermal sensitivity of lizard embryos indicates a mismatch between oxygen supply and demand at near-lethal temperatures

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