scholarly journals Relative importance of environmental factors in determining physiological differences between two populations of mussels (Mytilus edulis)

1984 ◽  
Vol 17 ◽  
pp. 33-47 ◽  
Author(s):  
J Widdows ◽  
P Donkin ◽  
PN Salkeld ◽  
JJ Cleary ◽  
DM Lowe ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Mytilus Edulis ◽  
Relative Importance ◽  
Physiological Differences ◽  
Two Populations

Demography of Xenosaurus platyceps (Squamata: Xenosauridae): a comparison between tropical and temperate populations

2008 ◽  
Vol 29 (2) ◽  
pp. 245-256 ◽  
Author(s):  
Carissa Jones ◽  
Isaac Rojas-González ◽  
Julio Lemos-Espinal ◽  
Jaime Zúñiga-Vega
Keyword(s):  
Life History ◽  
Population Growth ◽  
Adult Mortality ◽  
Life History Strategies ◽  
Relative Importance ◽  
Theoretical Frameworks ◽  
Population Growth Rates ◽  
Relative Contribution ◽  
Two Populations ◽  
Average Fitness

Abstract There appears to be variation in life-history strategies even between populations of the same species. For ectothermic organisms such as lizards, it has been predicted that demographic and life-history traits should differ consistently between temperate and tropical populations. This study compares the demographic strategies of a temperate and a tropical population of the lizard Xenosaurus platyceps. Population growth rates in both types of environments indicated populations in numerical equilibrium. Of the two populations, we found that the temperate population experiences lower adult mortality. The relative importance (estimated as the relative contribution to population growth rate) of permanence and of the adult/reproductive size classes is higher in the temperate population. In contrast, the relative importance for average fitness of fecundity and growth is higher in the tropical population. These results are consistent with the theoretical frameworks about life-historical differences among tropical and temperate lizard populations.

City Children’s Nature Knowledge and Contact: It Is Not Just About Biodiversity Provision

2017 ◽  
Vol 50 (10) ◽  
pp. 1145-1171 ◽  
Author(s):  
Claire Freeman ◽  
Aviva Stein ◽  
Kathryn Hand ◽  
Yolanda van Heezik
Keyword(s):  
New Zealand ◽  
Environmental Factors ◽  
Ethnic Group ◽  
Social Factors ◽  
Green Spaces ◽  
Social Connections ◽  
Relative Importance ◽  
Linear Modeling ◽  
Generalized Linear Modeling ◽  
Nature Contact

Much attention has been directed at the perceived decline in city children’s contact with nature. We used a child-centric approach to assess neighborhood nature knowledge in 187 children aged 9 to 11 years, from different socioeconomic and ethnic groups in three New Zealand cities. We evaluated the relative importance of social (independence, gender, social connections, deprivation, age) and environmental factors (biodiversity) in explaining variation in knowledge at a scale relevant to each child’s independent movements. Our biodiversity evaluation reflected the natural dimensions of the habitats where children interacted with nature. Generalized linear modeling identified ethnicity as having the strongest association with nature knowledge. Within each ethnic group, social factors were most important (independence, social connections, deprivation) except for Pākehā/NZ European children, where local biodiversity was most important. Enhancing biodiversity values of private green spaces (yards) would be effective in facilitating opportunities to experience nature, which is fundamental to supporting nature contact.

A Comparative Study of Palmar Dermatoglyphics in Thakurs and Lodhis of Bakshi Ka Talab Lucknow, Uttar Pradesh

2018 ◽  
Vol 2 (01) ◽  
Author(s):  
Preeti Gupta ◽  
Udai Pratap Singh
Keyword(s):  
Environmental Factors ◽  
Comparative Study ◽  
Uttar Pradesh ◽  
White Paper ◽  
The Other ◽  
Main Line ◽  
Males And Females ◽  
Index Value ◽  
Two Populations ◽  
Dermatoglyphic Traits

Dermatoglyphic characters vary widely and are unaffected by age, gender and least by environment. Unlike configurations and their distinctiveness with every individual, it also shows bilateral, bisexual and population variations. Palm prints once created are unchangeable throughout life and are unaffected by environmental factors. This paper is based upon the palmar dermatoglyphic. The study reports on bisexual and bilateral palm prints among Lodhis and Thakurs of Rudahi village of Bakshi Ka Talab, Lucknow District. The palmar dermatoglyphic traits have been analyzed among the two populations which are Main line Formula, Endings of main lines D and A, Position of Axial triradius, Angle atd, Main line Index, Hypothenar, Thenar/ Ist Interdigital area, IInd Interdigital area, IIIrd Interdigital area, IVth Interdigital area, and Palmar Ridge Counts. The prints have been obtained by using the duplicating ink method on white paper. On the perusal of Principal Main line Formula among Lodhis and Thakurs, it has been noticed that the frequency is more in Lodhi males than females in formula 11.9.7. On the other hand, the frequency of Thakur males is more than Thakur females in formula 9.7.5. The Ending of Main Line D in position 11 as clearly indicated in Lodhis is higher in both the genders in comparison to Thakurs, while the position 9 indicates highest frequency in Thakur females. The Ending of main line A at position 5’ has higher frequency in Lodhi males. The Main line index value 16 is observed higher in Lodhis in comparison to Thakurs. Higher frequency has been observed in Lodhis than Thakurs in Axial triradius in modal type‘t’. The range of Angle atd is observed to have higher frequency in 36º- 40º among the Lodhis as compared to Thakurs. The palmar ridge counts mean, is found higher in Lodhi females and Thakur males. Thus this paper shows the similarity and dissimilarity among the males and females of Thakurs and Lodhis in Palmar dermatoglyphics.

scholarly journals Acid–base physiology over tidal periods in the mussel Mytilus edulis : size and temperature are more influential than seawater pH

2019 ◽  
Vol 286 (1897) ◽  
pp. 20182863 ◽  
Author(s):  
Stephanie Mangan ◽  
Rod W. Wilson ◽  
Helen S. Findlay ◽  
Ceri Lewis
Keyword(s):  
Mytilus Edulis ◽  
Environmental Changes ◽  
Interactive Effect ◽  
Marine Biota ◽  
Acid Base ◽  
Tidal Cycles ◽  
Seawater Ph ◽  
Seawater Carbonate Chemistry ◽  
Two Populations

Ocean acidification (OA) studies to date have typically used stable open-ocean pH and CO 2 values to predict the physiological responses of intertidal species to future climate scenarios, with few studies accounting for natural fluctuations of abiotic conditions or the alternating periods of emersion and immersion routinely experienced during tidal cycles. Here, we determine seawater carbonate chemistry and the corresponding in situ haemolymph acid–base responses over real time for two populations of mussel ( Mytilus edulis ) during tidal cycles, demonstrating that intertidal mussels experience daily acidosis during emersion. Using these field data to parameterize experimental work we demonstrate that air temperature and mussel size strongly influence this acidosis, with larger mussels at higher temperatures experiencing greater acidosis. There was a small interactive effect of prior immersion in OA conditions (pH NBS 7.7/pCO 2 930 µatm) such that the haemolymph pH measured at the start of emersion was lower in large mussels exposed to OA. Critically, the acidosis induced in mussels during emersion in situ was greater (ΔpH approximately 0.8 units) than that induced by experimental OA (ΔpH approximately 0.1 units). Understanding how environmental fluctuations influence physiology under current scenarios is critical to our ability to predict the responses of key marine biota to future environmental changes.

scholarly journals Structuring of Dragonfly Communities (Insecta: Odonata) in Eastern Amazon: Effects of Environmental and Spatial Factors in Preserved and Altered Streams

Insects ◽  
2019 ◽  
Vol 10 (10) ◽  
pp. 322 ◽  
Author(s):  
Oliveira-Junior ◽  
Juen
Keyword(s):  
Environmental Factors ◽  
Biotic Interactions ◽  
Environmental Variation ◽  
Relative Importance ◽  
Spatial Variables ◽  
Spatial Factors ◽  
The Past ◽  
Analytical Perspective ◽  
Physical Features ◽  
Natural Communities

The evaluation of the effects of environmental factors on natural communities has been one of the principal approaches in ecology; although, over the past decade, increasing importance has been given to spatial factors. In this context, we evaluated the relative importance of environmental and spatial factors for the structuring of the local odonate communities in preserved and altered streams. Adult Odonata were sampled in 98 streams in eastern Amazonia, Brazil. The physical features of each stream were evaluated and spatial variables were generated. Only environmental factors accounted for the variation in the Odonata community. The same pattern was observed in the suborder Zygoptera. For Anisoptera, environmental factors alone affect the variation in the community, considering all the environments together, and the altered areas on their own. As the two Odonata suborders presented distinct responses to environmental factors, this partitioning may contribute to an improvement in the precision of studies in biomonitoring. We thus suggest that studies would have a greater explanatory potential if additional variables are included, related to biotic interactions (e.g., competition). This will require further investigation on a finer scale of environmental variation to determine how the Odonata fauna of Amazonian streams behaves under this analytical perspective.

The cytochemical distributions of zinc (Zn II) and iron (Fe III) in the common mussel, Mytilus edulis, and their relationship with lysosomes

1979 ◽  
Vol 59 (4) ◽  
pp. 851-858 ◽  
Author(s):  
D. M. Lowe ◽  
M. N. Moore
Keyword(s):  
Mytilus Edulis ◽  
Cell Types ◽  
Cellular Distribution ◽  
Cytoplasmic Inclusions ◽  
The Common ◽  
Two Populations

Zinc (Zn II) and iron (Fe III) were demonstrated histochemically in cytoplasmic inclusions shown to be lysosomes in a number of cell types in Mytilus edulis. The cellular distribution of the metals differed between the sexes; males were shown to have more zinc (Zn II) in the kidney than females, the latter appearing to use oocytes as an additional means of excretion. Differences in cellular distribution of the metals was also demonstrated between the two populations studied probably reflecting availability of the metals in their respective environment.

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