Bivoltinism in<i>Coenagrion mercuriale</i>(Zygoptera: Odonata) in the Southern Margin of Its Distribution Range: Emergence Pattern and Larval Growth

Cited by 16 publications

(14 citation statements)

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“…; Stearns, ). Consistent to our study, body size was larger in the spring cohort than in the autumn cohort most likely because the former develops for 6–11 months whereas the latter takes 3–4 months to develop (Mahdjoub et al., ). It can be inferred that the development rate was seasonally plastic and depended positively on water temperature (Suhling, Suhling, & Richter, ) which was considerably higher in summer, leading to faster development and emergence in the autumn.…”

Section: Discussionsupporting

confidence: 90%

“…The spring (slower-developing) cohort showed a decreasing pattern, that is, individuals that reproduce early in the season were larger than those that reproduce later in the season. This is a typical pattern in C. mercuriale in particular (Mahdjoub et al, 2015;, other odonates (Banks & Thompson, 1985;Corbet, 1999;Michiels & Dhondt, 1989) and insects in general (Comiskey, Lowrie, & Wesson, 1999;Peckarsky, Cowan, Penton, & Anderson, 1993). On the other hand, the autumn (faster-developing) cohort showed no significant seasonal pattern of body size, which might be explained by the short development period and the low intracohort variation where temperatures are lower and thus development is slower which allow them to accumulate mass and grow bigger whereas the smaller individuals that emerge later in the spring season are those that hatch in summer where temperature is higher and thus development is faster, which results in shorter time spent as larvae and smaller size at emergence (Davidowitz, D'Amico, & Nijhout, 2003).…”

Section: Discussionmentioning

confidence: 58%

“…The spring (slower‐developing) cohort showed a decreasing pattern, that is, individuals that reproduce early in the season were larger than those that reproduce later in the season. This is a typical pattern in C. mercuriale in particular (Mahdjoub et al., ; Purse & Thompson, ), other odonates (Banks & Thompson, ; Corbet, ; Michiels & Dhondt, ) and insects in general (Comiskey, Lowrie, & Wesson, ; Peckarsky, Cowan, Penton, & Anderson, ). On the other hand, the autumn (faster‐developing) cohort showed no significant seasonal pattern of body size, which might be explained by the short development period and the low intracohort variation in age at emergence (maturity) in the autumn cohort compared to the spring cohort.…”

Section: Discussionmentioning

confidence: 74%

“…The species is listed as endangered in most parts of its geographic range (Boudot et al., ). The voltinism of the species is plastic across its distribution range with a semivoltine life history at its northern range limits (UK) (Corbet, ; Purse & Thompson, ) and a partially bivoltine life history at its southern range limits (North Africa) (Mahdjoub et al., ). The larger cohort emerges in early spring and reproduces after a short maturation period of about a week (Mahdjoub et al., ).…”

Section: Methodsmentioning

confidence: 99%

“…The larger cohort emerges in early spring and reproduces after a short maturation period of about a week (Mahdjoub et al., ). Eggs that are laid during the spring reproductive season hatch in summer, but some of the larvae develop rapidly and emerge in late summer and autumn (hereafter autumn cohort) (Mahdjoub et al., ). However, most of the larvae emerge in the next spring where the adult cohort consists of individuals that resulted from spring and autumn reproduction (hereafter spring cohort).…”

Section: Methodsmentioning

confidence: 99%

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Field estimates of fitness costs of the pace‐of‐life in an endangered damselfly

Khelifa

Zebsa

Amari

et al. 2019

J of Evolutionary Biology

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Theory predicts that within‐population differences in the pace‐of‐life can lead to cohort splitting and produce marked intraspecific variation in body size. Although many studies showed that body size is positively correlated with fitness, many argue that selection for the larger body is counterbalanced by opposing physiological and ecological selective mechanisms that favour smaller body. When a population split into cohorts with different paces of life (slow or fast cohort), one would expect to detect the fitness–size relationship among and within cohorts, that is, (a) slower‐developing cohort has larger body size and higher fitness than faster‐developing cohort, and (b) larger individuals within each cohort show higher fitness than smaller individuals. Here, we test these hypotheses in capture–mark–recapture field surveys that assess body size, lifespan, survival and lifetime mating success in two consecutive generations of a partially bivoltine aquatic insect, Coenagrion mercuriale, where the spring cohort is slower‐developing than the autumn cohort. As expected, body size was larger in the slow‐developing cohort, which is consistent with the temperature‐size rule and also with the duration of development. Body size seasonal variation was greater in slow‐developing cohort most likely because of the higher variation in age at maturity. Concordant with theory, survival probability, lifespan and lifetime mating success were higher in the slow‐developing cohort. Moreover, individual body size was positively correlated with survival and mating success in both cohorts. Our study confirms the fitness costs of fast pace‐of‐life and the benefits of larger body size to adult fitness.

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Section: Discussionsupporting

confidence: 90%