Egg Size Variation in Lake Trout: Phenotype–Habitat Correlations Show an Effect of Rearing Environment

Jastrebski, Christopher; Morbey, Yolanda E.

doi:10.1577/t08-175.1

Cited by 11 publications

(11 citation statements)

References 39 publications

(34 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The prevalence of positive maternal effects on egg size in this species, in concert with similar relationships between egg size and maternal size in other species such as yellow perch ( Perca flavescens ; Andree et al. ), lake trout (Jastrebski and Morbey ), and Atlantic cod ( Gadus morhua ; Marteinsdottir and Steinarsson ), suggests that management practices protecting large, old females could indeed improve stock stability and productivity (Hixon et al. ).…”

Section: Discussionsupporting

confidence: 58%

“…Similar to this study, variance in offspring length was negatively correlated with maternal age and clutch number in Daphnia magna (Ebert ). Other examinations of intra‐individual offspring size variation in fish (Einum and Fleming ) have found generally low amounts of variation and little evidence for environmental correlates, instead suggesting that observed variance within clutches may be simply due to a lack of precise control of egg size by individual females (Jastrebski and Morbey ). However, the relationship of egg size CV to maternal length among populations and seasonal thermal conditions within populations suggests that such variation is not simply random variance and merits further examination, as variation in offspring size has important potential implications for offspring fitness, especially in unpredictable environments or where intraspecific competition is prevalent (Parichy and Kaplan , Koops et al.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Thermal environment and maternal effects shape egg size in a freshwater fish

et al. 2016

View full text Add to dashboard Cite

Abstract. Offspring size determines offspring survival rates; thus, understanding factors influencing offspring size variability could elucidate variation in population dynamics. Offspring size variation is influenced through multigenerational adaptation to local environments and within-lifetime plastic responses to environmental variability and maternal effects among individuals. Moreover, offspring size variation may represent trade-offs in energy allocation within individuals that influence lifetime reproductive success. However, the mechanisms whereby environmental conditions influence offspring size, e.g., via inducing adaptive and plastic variation in population-scale maternal effects, remain poorly understood. We evaluated intra-specific variation in maternal effects, egg size, and intra-individual egg size variation in six populations of walleye (Sander vitreus) and related among-and within-population patterns to thermal conditions. Egg size was conserved within populations and negatively related to long-term thermal conditions among populations, while maternal effect strengths were positively related to thermal conditions, suggesting that populations inhabiting warmer environments adapted to produce smaller eggs but stronger maternal effects. Within a population, egg size was positively related to colder winters, suggesting cold winters may alter egg size through effects on maternal condition or as an adaptive maternal effect to improve offspring survival. Intra-individual egg size variation varied little among populations or with female size, but declined with increasing summer and decreasing winter temperatures. Our result suggests that environmental conditions could impact not only short-term offspring production but also spur adaptive changes in offspring phenotypes. Thus, it is necessary to account for adaptive responses to predict population dynamics under environmental changes.

show abstract

Section: Discussionsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 99%

Thermal environment and maternal effects shape egg size in a freshwater fish

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Indeed, a negative relationship between egg size and fecundity has been detected in many species (e.g., Dziminski et al, 2009;Heath et al, 1999), including our study species, walleye (Sander vitreus; Henderson and Nepszy, 1994). Moreover, past studies have demonstrated linkages between egg size and egg quality (e.g., Jastrebski and Morbey, 2009;Murry et al, 2008;Wiegand et al, 2004), offspring size, and hence, offspring performance (Miller et al, 1988). For example, larger walleye eggs tend to have greater yolk and oil volumes (Moodie et al, 1989), and even though proportional lipid content may be independent of egg size (Czesny et al, 2005), total lipid content will increase with egg size.…”

Section: Introductionsupporting

confidence: 50%

Maternal and stock effects on egg-size variation among walleye Sander vitreus stocks from the Great Lakes region

Wang

Einhouse

Fielder

et al. 2012

Journal of Great Lakes Research

View full text Add to dashboard Cite

“…Egg size remains an interesting parameter to measure. Although the possible benefit effect of egg size on egg survival and alevins is still debated, especially under aquaculture conditions (Bobe and Labbé, 2010; Bromage et al, 1992; Campbell et al, 1992; Jastrebski and Morbey, 2009; Migaud et al, 2013; Springate and Bromage, 1985b), it is established that larger eggs produced larger alevins (Springate and Bromage, 1985) with substantial fitness advantages over small alevins (Heath et al, 2003). While egg size is very often measured in studies on fish reproductive performance, it is unusual to observe egg size variability in intra spawn as a measured parameter.…”

Section: Resultsmentioning

confidence: 99%

VisEgg: A robust phenotyping tool to assess rainbow trout egg features and viability

Cardona

Segret

Bugeon

et al. 2020

Preprint

View full text Add to dashboard Cite

Assessing female fish reproductive success requires a thorough evaluation of egg characteristics, including egg number, size and variability as well as egg developmental potential through the monitoring of embryo survival after fertilization. While embryonic success relies, at least in part, on paternal contribution, some parameters are strictly related to egg characteristics, one of the main ones being the viability of the egg when released into the water at spawning. It is however not necessarily possible, at least in salmonid fish that lay non-transparent eggs, to separate the different causes of egg/embryo failure.In this context, our aim was i) to develop a simple and rapid system to capture images of rainbow trout eggs combined with computerized processing of these images to perform a fully automatic individual characterization of egg features including number and size ii) to estimate unfertilized egg viability through the monitoring of the percentage of eggs that will not survive to water hydration.To evaluate the VisEgg system, unfertilized eggs (approximatively 400 eggs per batch) originating from 105 different females were hydrated in water. After 24h, a picture of the eggs was obtained using a dedicated shooting system consisting of a light source and a digital single-lens reflex (SLR) camera. An image processing algorithm was developed to allow the automatic detection and separation of the eggs and to perform automatic measurements of egg number and individual egg size. The presence of white egg was used as an indirect measure of egg integrity, the “whitening” being the result of water entry into the egg through the vitelline membrane. These white eggs were therefore considered as non-viable, as a result of their lack of physical integrity.Fertilization assays were performed in parallel using a subsample of the same egg batch. Embryonic development was monitored and hatching rate was calculated. A significant correlation between white egg percentage after hydration and hatching rate was observed (Spearman coefficient =-0.557, p<0.001), in consistency with the fact that non-viable egg will not allow successful embryonic development. In contrast, the percentage of eggs that do not successfully hatched includes egg/embryo failures of different nature including egg viability, their capacity to be fertilized and to develop into an embryo. Using VisEgg, we were able to quantify the lack of viability of the eggs separately from the different other events that may occur during fertilization and incubation. VisEgg is a convenient and reliable tool to obtain individuals measures on trout eggs. It can be used to assess not only egg size and egg number but also unfertilized egg viability before fertilization.

show abstract

Egg Size Variation in Lake Trout: Phenotype–Habitat Correlations Show an Effect of Rearing Environment

Cited by 11 publications

References 39 publications

Thermal environment and maternal effects shape egg size in a freshwater fish

Thermal environment and maternal effects shape egg size in a freshwater fish

Maternal and stock effects on egg-size variation among walleye Sander vitreus stocks from the Great Lakes region

VisEgg: A robust phenotyping tool to assess rainbow trout egg features and viability

Contact Info

Product

Resources

About