scholarly journals Fitness benefits and costs of shelters to the sea urchin Glyptocidaris crenularis

PeerJ ◽  
2020 ◽  
Vol 8 ◽  
pp. e8886
Author(s):  
Xiaomei Chi ◽  
Jiangnan Sun ◽  
Yushi Yu ◽  
Jia Luo ◽  
Bao Zhao ◽  
...  
Keyword(s):  
Sea Urchin ◽  
Sea Urchins ◽  
Natural Environments ◽  
Trade Off ◽  
Positive Effects ◽  
Long Term Study ◽  
Glyptocidaris Crenularis ◽  
Fitness Benefits ◽  
Benefits And Costs

Understanding the ecological role of shelters is greatly hampered by the scarcity of long-term laboratory experiments on the trade-off between fitness benefits and costs. This lack probably leads to an underestimation of the negative and/or positive effects on behaviors and growth of marine invertebrates in benthic ecosystems. Although our previous study revealed a significant effect on fitness-related traits of Glyptocidaris crenularis after 31 months, the present study extended it and investigated fitness benefits and/or costs of long-term sheltering on sea urchins to over 7 years. The present long-term study suggests that the previously reported reduction in feeding rate probably resulted from a reduction in reflexive feeding motions (Aristotle’s lantern reflex) rather than changes in foraging behavior. Actively seeking sheltering behavior was negatively impacted in individuals with continuous access to shelters. However, covering and righting behaviors did not differ in sheltered sea urchins, indicating that these behaviors are maintained to escape from adverse environments regardless of shelter. Body size of sea urchins in the group with shelters was significantly lower than those without shelters after 7 years. Weights of gonads and gut were not significantly different after 7 years despite previous observations of differences after ~2.5 years. The present study provides valuable information on the trade-off between fitness benefits and costs to sea urchins residing in shelters. However, the present study is only a laboratory investigation for one urchin species (G. crenularis) which does not consider the complexity of natural environments. Field studies should be carried out with G. crenularis and other sea urchin species, before a more universal conclusion can be drawn.

scholarly journals Functional and evolutionary trade-offs co-occur between two consolidated memory phases in Drosophila melanogaster

2012 ◽  
Vol 279 (1744) ◽  
pp. 4015-4023 ◽  
Author(s):  
Fabrice Lagasse ◽  
Celine Moreno ◽  
Thomas Preat ◽  
Frederic Mery
Keyword(s):  
Evolutionary Dynamics ◽  
Functional Relationship ◽  
Learning Task ◽  
Long Term Memory ◽  
Phenotypic Traits ◽  
Trade Offs ◽  
Memory Phase ◽  
Fitness Benefits ◽  
Benefits And Costs

Memory is a complex and dynamic process that is composed of different phases. Its evolution under natural selection probably depends on a balance between fitness benefits and costs. In Drosophila , two separate forms of consolidated memory phases can be generated experimentally: anaesthesia-resistant memory (ARM) and long-term memory (LTM). In recent years, several studies have focused on the differences between these long-lasting memory types and have found that, at the functional level, ARM and LTM are antagonistic. How this functional relationship will affect their evolutionary dynamics remains unknown. We selected for flies with either improved ARM or improved LTM over several generations, and found that flies selected specifically for improvement of one consolidated memory phase show reduced performance in the other memory phase. We also found that improved LTM was linked to decreased longevity in male flies but not in females. Conversely, males with improved ARM had increased longevity. We found no correlation between either improved ARM or LTM and other phenotypic traits. This is, to our knowledge, the first evidence of a symmetrical evolutionary trade-off between two memory phases for the same learning task. Such trade-offs may have an important impact on the evolution of cognitive capacities. On a neural level, these results support the hypothesis that mechanisms underlying these forms of consolidated memory are, to some degree, antagonistic.

Sustainable Development in Family Firms

2022 ◽  
pp. 565-582
Author(s):  
Angela Dettori ◽  
Michela Floris ◽  
Cinzia Dessì
Keyword(s):  
Sustainable Development ◽  
Family Firms ◽  
Single Case ◽  
Natural Environments ◽  
Term Survival ◽  
Positive Effects ◽  
Firm Success ◽  
Sustainability Challenges

This chapter outlines the relevance of sustainable development as a key for family firm success and its ability to guarantee long-term survival and spread positive effects in social, economic, and natural environments. By particularly analyzing a single case study of a Sardinian family business, this work explores the intertwined relationships among sustainability, owner innovativeness, and firm success. Moreover, the importance of family businesses and the scarcity of the study conducted to date have suggested a focus on how these companies tackle sustainability challenges.

Estrogen administration to the edible sea urchin Paracentrotus lividus (Lamarck, 1816)*

Zoosymposia ◽  
2012 ◽  
Vol 7 (1) ◽  
pp. 247-254 ◽  
Author(s):  
SILVIA MERCURIO ◽  
MICHELA SUGNI ◽  
DENISE FERNANDES ◽  
CINTA PORTE ◽  
MARIA DANIELA CANDIA CARNEVALI
Keyword(s):  
Sea Urchin ◽  
Sea Urchins ◽  
Gonad Index ◽  
Hormonal Treatment ◽  
Paracentrotus Lividus ◽  
Maturation Stage ◽  
Physiological Values ◽  
Estrogen Administration

Despite the extensive use of sea urchins in embryology, the hormonal mechanisms regulating echinoid reproductive pro­cesses are scarcely known. This research is focused on the role of estradiol (E2), whose presence and seasonal variations in different echinoderm tissues have been previously reported. Three different concentrations of E2 were administered (via peristomial injection, 2/week) to adult specimens of the sea urchin Paracentrotus lividus for 2 and 12 weeks. The lowest concentration was close to physiological values, previously measured in field specimens. Despite the increase of circulating E2 in the coelomic fluids, neither short- nor long-term hormonal treatment induced marked variations in the considered reproductive parameters. The Gonad Index appeared to be more influenced by the feed intake than by E2. Similarly, the maturation stage of the gonads was not markedly affected by E2 injection, although some sex-specific dif­ferences could be observed: treated females never reached the maximum maturation stage compared to controls, although this was observed in males injected with the lowest E2 concentration. Although further research is needed to confirm our observations, according to the present study E2 does not markedly influence echinoid reproduction and, particularly, it does not promote female maturation, as reported for vertebrates and suggested for asteroid echinoderms.

Effects of latitude on the trade-off between reproduction and moult: a long-term study with pied flycatcher

Oecologia ◽  
2001 ◽  
Vol 129 (2) ◽  
pp. 206-212 ◽  
Author(s):  
Christer Hemborg ◽  
Juan Sanz ◽  
Arne Lundberg
Keyword(s):  
Pied Flycatcher ◽  
Term Study ◽  
Trade Off ◽  
Long Term Study

Effects of garden visits on people with dementia: A pilot study

Dementia ◽  
2018 ◽  
Vol 19 (4) ◽  
pp. 1009-1028
Author(s):  
Man-Li Liao ◽  
Sheng-Jung Ou ◽  
Chung Heng Hsieh ◽  
Zhelin Li ◽  
Chia-Chun Ko
Keyword(s):  
Pilot Study ◽  
Repeated Measures ◽  
Long Term Memory ◽  
Natural Environments ◽  
Language Abilities ◽  
Staff Members ◽  
Positive Effects ◽  
People With Dementia

The number of people with dementia is increasing rapidly worldwide. Developing strategies to improve quality of life for those with dementia is crucial and is receiving more attention. Natural environments are known for their healing effects on most people. This pilot study aimed to understand the benefits that natural environments, such as gardens, can provide for people with dementia. In total, 42 staff members in nine dementia care facilities were recruited as participants in this study and answered a semistructured questionnaire. One-way analysis of variance with repeated measures and the Mann–Whitney U test were used to compare the effects of garden visits on evaluated characteristics and the differences in evaluated characteristics between free garden use and unfree garden use groups. Data from open-ended questions underwent text analysis to obtain the principal beliefs of the participants. The staff members reported that garden visits had positive effects on mood, social interaction, depression, and agitation in people with dementia because of the multisensory, gentle stimuli of the natural environment. Of the evaluated cognitive characteristics, attention and orientation to time were improved the most after residents with dementia had spent time in a garden. Additionally, staff members in the free garden use group scored the effects of garden visits on the mood, long-term memory, language abilities, spatial ability, aggression, and agitation of patients with dementia as significantly higher than staff members in the unfree garden use group. Recommendations for future studies are discussed.

scholarly journals Genetic covariation between effectiveness and cost of defence in aphids

2008 ◽  
Vol 4 (6) ◽  
pp. 674-676 ◽  
Author(s):  
Christoph Vorburger ◽  
Alexandre Gouskov ◽  
Simone von Burg
Keyword(s):  
Genetic Variation ◽  
Ecological Immunology ◽  
Short Term ◽  
Potato Aphid ◽  
Trade Off ◽  
Evolution Of Resistance ◽  
Benefits And Costs ◽  
Peach Potato Aphid ◽  
Aphid Clones

Ecological immunology distinguishes between the long-term evolutionary costs of possessing defences against parasites and the short-term costs of using them. Evolutionary biologists have typically focused on the former in the search for constraints on the evolution of resistance. Here, we show in the peach-potato aphid, Myzus persicae , that short-term costs may be of equal evolutionary importance. Survivors of more resistant aphid clones suffered a higher reduction of fecundity upon parasitoid attack than survivors of more susceptible clones. This genetically based trade-off between benefits and costs of defence may limit the evolution of increased resistance and explain the maintenance of genetic variation for resistance under environmental variation in parasitism risk.

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