Differences in life history characteristics among three sympatric evolutionary species of the<i>Rotaria rotatoria</i>complex

Xiang, Xian-Ling; Jiang, Ruiming; Tao, Yuanyuan; Chen, Yingying; Xi, Yi-Long

doi:10.1080/02705060.2016.1141379

Cited by 11 publications

(3 citation statements)

References 66 publications

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“…In both species we found a profound effect of temperature on survival; in both species increasing temperature led to reduced life span. Our results corroborate studies in other rotifer taxa that showed a profound effect of temperature on survival (Kauler & Enesco, 2011;Li et al, 2010;Xiang, Jiang, Tao, Chen, & Xi, 2016;. Due to their ectothermic nature, rotifer body temperature increases with increasing ambient temperature, which accelerates metabolic rates.…”

Section: Life History Heat Response Between Heat-tolerant and Heat-sensitive Brachionus Speciessupporting

confidence: 90%

Temperature-dependent life history and transcriptomic responses in heat-tolerant versus heat-sensitive Brachionus rotifers

et al.

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A species' response to thermal stress is an essential physiological trait that can determine occurrence and temporal succession in nature, including response to climate change. Environmental temperature affects zooplankton performance by altering life-spans and population growth rates, but the molecular mechanisms underlying these alterations are largely unknown. To compare temperature-related demography, we performed cross-temperature life-table experiments in closely related heat-tolerant and heat-sensitive Brachionus rotifer species that occur in sympatry. Within these same populations, we examined the genetic basis of physiological variation by comparing gene expression across increasing temperatures. We found significant cross-species and cross-temperature differences in heat response, with the heat-sensitive species adopting a strategy of high survival and low population growth, while the heat-tolerant followed an opposite strategy. Comparative transcriptomic analyses revealed both shared and opposing responses to heat. Most notably, expression of heat shock proteins (hsps) is strikingly different in the two species. In both species, hsp responses mirrored differences in population growth rates, showing that hsp genes are likely a key component of a species' adaptation to different temperatures. Temperature induction caused opposing patterns of expression in further functional categories such as energy, carbohydrate and lipid metabolism, and in genes related to ribosomal proteins. In the heat-sensitive species, elevated temperatures caused up-regulation of genes related to induction of meiotic division as well as genes responsible for post-translational histone modifications. This work demonstrates the sweeping reorganizations of biological functions that accompany temperature adaptation in these two species and reveals potential molecular mechanisms that might be activated for adaptation to global warming.

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Section: Life History Heat Response Between Heat-tolerant and Heat-sensitive Brachionus Speciessupporting

confidence: 90%

Temperature-dependent life history and transcriptomic responses in heat-tolerant versus heat-sensitive Brachionus rotifers

et al.

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“…In the second case, several reports show that there are several degrees of tolerance to desiccation among bdelloid morphospecies (Eyres et al, 2015) but none have focused on variations within species complexes. However, three cryptic species morphologically identified as Rotaria rotatoria have been reported to have distinct temperature preferences (Xiang et al , 2016), often linked to desiccation tolerance. In the present study, we did not identify physico-chemical parameters that may vary among the different dishes.…”

Section: Discussionmentioning

confidence: 99%

Immigration from the metacommunity affects bdelloid rotifer community dynamics most

Debortoli

Doninck

2018

Preprint

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Dispersal is an important driver of local community dynamics. It has been proposed that, for communities composed of microscopic organisms, dispersal could well be the dominant process, outpacing local processes driven by environmental conditions and species interactions. This is because microscopic organisms often reproduce asexually, fostering rapid colonization, and are easily dispersed by water or air current. We studied the case of bdelloid rotifers belonging to the genus Adineta, microscopic asexual animals with dried stages that are easily dispersed by wind to investigate the relative effects of dispersal and local processes on their community dynamics. To this end, we constructed a classic competition model to theoretically examine how spatial and local biodiversity dynamics varied with fitness and dispersal characteristics of bdelloid Adineta species. Next, we compared our predictions with an experimental dataset containing spatio-temporal Adineta community dynamics from the wild. This comparison suggested that immigration from the local meta-community was the most critical parameter under the conditions tested. One Adineta vaga species, abundant in the surrounding area, rapidly colonized our experimental habitats and dominated most of the communities. We also ran the model under different levels of environmental conditions (permissive, intermediate and harsh) to simulate seasonal community variability and found that communities experience important bottlenecks yearly in winter but that the same community re-established. The dissimilarities observed between roof communities suggest differences in adaptation or immigration capacities. Besides their asexual reproduction and extreme desiccation tolerance, a key characteristic of bdelloid ecology identified here, is the spatio-temporal dynamic of abundant bdelloid clones present in the meta-community that rapidly colonize empty patches to establish new populations.

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“…It was semi-continuously cultivated at 28°C under illumination of 54 μmol•photons m −2 •s −1 and light cycle of Light:Dark = 12 h:12 h. Subsequently, the algae were maintained in the exponential phase by routine dilution using BG-11 medium (Andersen 2005). The rotifer R. rotatoria was sampled from a pond in Hexian, Anhui Province, China, which has been identified by molecular methods in the study by Xiang et al (2016) and microscopic discrimination of morphological characteristics following guidelines from the literature (Donner 1965;Ricci and Melone 2000;Fontaneto et al 2007). The rotifers were subsequently cultured in an 8 mL tumbler with EPA medium (OECD 2004) at 28°C.…”

Section: Cultivation Of the Test Organismsmentioning

confidence: 99%

Ecological response of Rotaria rotatoria (Bdelloid Rotifera) to unbalanced nitrogen in food: experimental insights from life history strategy and feeding behavior

Xiang,

Li,

Feng

et al. 2023

Écoscience

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Nitrogen (N) cycle in ecosystems has been overbalanced by human activities. However, it remains uncertain whether the altered N supply results in a change in the elemental composition of phytoplankton and, consequently, affects the life history strategy of zooplankton. To investigate these impacts, a simple lab-based food chain was established. Results show that lack or excess of nitrogen reduced algal density, cell volume, growth rate and chlorophyll content. Moreover, N content in algae significantly increased with increased N concentration in the medium, and reached saturation at concentrations ≥5 mg•L −1 . Feeding on algae grown in a low-nitrogen or no nitrogen mediums resulted in faster decline in age-specific survival of rotifers, and slower population growth, as well as longer generation time. In order to make up for nutritional shortage, grazing and filtration rates increased. On the other hand, rotifers feeding on algae grown in high-N mediums (A 50 and A 200 ) had significantly shorter average lifespan and life expectancy at hatching. Therefore, nitrogen imbalances have adverse effects on the growth, development and reproduction of both primary producers and herbivorous zooplankton in the food chain. RÉSUMÉLe cycle de l'azote dans les écosystèmes est affecté par les activités humaines, mais il est incertain s'il en résulte une modification de la composition élémentaire du phytoplancton et, conséquemment, du cycle vital du zooplancton. Pour étudier ces effets, une chaîne alimentaire simple a été établie en laboratoire. Les résultats montrent qu'une carence ou un excès d'azote réduit la densité, le volume cellulaire, le taux de croissance et le contenu en chlorophylle des algues. De plus, le contenu en azote des algues augmente significativement avec l'augmentation de la concentration en azote du milieu, pour atteindre la saturation à des concentrations ≥5 mg•L −1 . Les rotifères se nourrissant d'algues ayant poussé dans un milieu pauvre en azote ou sans azote affichent un déclin plus rapide de leur taux de survie, une croissance populationnelle plus lente et un allongement de la durée des générations. Afin de compenser la carence nutritionnelle, les taux de broutement et de filtration augmentent. D'un autre côté, les rotifères se nourrissant d'algues ayant poussé dans des milieux riches en azote (A 50 et A 200 ) ont des durées de vie moyennes et des espérances de vie significativement plus courtes. Par conséquent, les déséquilibres du cycle de l'azote ont des effets délétères sur la croissance, le développement et la reproduction des producteurs primaires et du zooplancton herbivore dans la chaîne alimentaire.

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Differences in life history characteristics among three sympatric evolutionary species of theRotaria rotatoriacomplex

Cited by 11 publications

References 66 publications

Temperature-dependent life history and transcriptomic responses in heat-tolerant versus heat-sensitive Brachionus rotifers

Temperature-dependent life history and transcriptomic responses in heat-tolerant versus heat-sensitive Brachionus rotifers

Immigration from the metacommunity affects bdelloid rotifer community dynamics most

Ecological response of Rotaria rotatoria (Bdelloid Rotifera) to unbalanced nitrogen in food: experimental insights from life history strategy and feeding behavior

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