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Effect of Ecological Restoration on Body Condition of a Predator.

González-Tokman D, Martínez-Garza C - PLoS ONE (2015)

Bottom Line: We predicted (1) better body condition in spiders of conserved and restored sites, compared to disturbed sites, and (2) better body condition in plots with maximal intervention than in plots with minimal intervention.We discuss how different life histories and environmental pressures, such as food availability, parasitism, and competition for resources can explain our contrasting findings in male and female spiders.By studying animal physiology in restoration experiments it is possible to understand the mechanistic basis of ecological and evolutionary processes that determine success of ecological restoration.

View Article: PubMed Central - PubMed

Affiliation: Centro de Investigación en Biodiversidad y Conservación, Universidad Autónoma del Estado de Morelos. Cuernavaca, Morelos, México; Consejo Nacional de Ciencia y Tecnología, Cátedras CONACYT, México, D. F., México.

ABSTRACT
Ecological restoration attempts to recover the structure and function of ecosystems that have been degraded by human activities. A crucial test of ecosystem recovery would be to determine whether individuals in restored environments are as healthy as those in conserved environments. However, the impact of restoration on physiology of terrestrial animals has never been tested. Here, we evaluated the effect of two restoration methods on body condition measured as body size, body mass, lipid and muscle content of the spider Nephila clavipes in a tropical dry forest that has suffered chronic disturbance due to cattle grazing. We used experimental plots that had been excluded from disturbance by cattle grazing during eight years. Plots were either planted with native trees (i. e. maximal intervention), or only excluded from disturbance (i. e. minimal intervention), and were compared with control conserved (remnants of original forest) and disturbed plots (where cattle is allowed to graze). We predicted (1) better body condition in spiders of conserved and restored sites, compared to disturbed sites, and (2) better body condition in plots with maximal intervention than in plots with minimal intervention. The first prediction was not supported in males or females, and the second prediction was only supported in females: body dry mass was higher in planted than in conserved plots for spiders of both sexes and also higher that in disturbed plots for males, suggesting that plantings are providing more resources. We discuss how different life histories and environmental pressures, such as food availability, parasitism, and competition for resources can explain our contrasting findings in male and female spiders. By studying animal physiology in restoration experiments it is possible to understand the mechanistic basis of ecological and evolutionary processes that determine success of ecological restoration.

No MeSH data available.


Related in: MedlinePlus

Effect of different habitats on body dry mass of Nephila clavipes male spiders inhabiting plots under two levels of restoration (exclusions and plantings) and conserved and perturbed areas in the dry forest.Different letters represent significant differences between treatments. Lines represent means ± 95% confidence intervals.
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pone.0133551.g003: Effect of different habitats on body dry mass of Nephila clavipes male spiders inhabiting plots under two levels of restoration (exclusions and plantings) and conserved and perturbed areas in the dry forest.Different letters represent significant differences between treatments. Lines represent means ± 95% confidence intervals.

Mentions: The trends observed in males did not follow our predictions. Body dry mass was affected by restoration treatment: males in plantings had heavier bodies than males in conserved or disturbed plots, but similar weights to those in excluded plots (Table 1; Fig 3). Contrary to our predictions, body dry mass did not differ between males from conserved and disturbed plots. Lipid mass and muscle mass did not differ across restoration treatments (Table 1). Body size was positively related with body dry mass and muscle mass, but not with lipid mass (Table 1; Fig 4A and 4B).


Effect of Ecological Restoration on Body Condition of a Predator.

González-Tokman D, Martínez-Garza C - PLoS ONE (2015)

Effect of different habitats on body dry mass of Nephila clavipes male spiders inhabiting plots under two levels of restoration (exclusions and plantings) and conserved and perturbed areas in the dry forest.Different letters represent significant differences between treatments. Lines represent means ± 95% confidence intervals.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4520667&req=5

pone.0133551.g003: Effect of different habitats on body dry mass of Nephila clavipes male spiders inhabiting plots under two levels of restoration (exclusions and plantings) and conserved and perturbed areas in the dry forest.Different letters represent significant differences between treatments. Lines represent means ± 95% confidence intervals.
Mentions: The trends observed in males did not follow our predictions. Body dry mass was affected by restoration treatment: males in plantings had heavier bodies than males in conserved or disturbed plots, but similar weights to those in excluded plots (Table 1; Fig 3). Contrary to our predictions, body dry mass did not differ between males from conserved and disturbed plots. Lipid mass and muscle mass did not differ across restoration treatments (Table 1). Body size was positively related with body dry mass and muscle mass, but not with lipid mass (Table 1; Fig 4A and 4B).

Bottom Line: We predicted (1) better body condition in spiders of conserved and restored sites, compared to disturbed sites, and (2) better body condition in plots with maximal intervention than in plots with minimal intervention.We discuss how different life histories and environmental pressures, such as food availability, parasitism, and competition for resources can explain our contrasting findings in male and female spiders.By studying animal physiology in restoration experiments it is possible to understand the mechanistic basis of ecological and evolutionary processes that determine success of ecological restoration.

View Article: PubMed Central - PubMed

Affiliation: Centro de Investigación en Biodiversidad y Conservación, Universidad Autónoma del Estado de Morelos. Cuernavaca, Morelos, México; Consejo Nacional de Ciencia y Tecnología, Cátedras CONACYT, México, D. F., México.

ABSTRACT
Ecological restoration attempts to recover the structure and function of ecosystems that have been degraded by human activities. A crucial test of ecosystem recovery would be to determine whether individuals in restored environments are as healthy as those in conserved environments. However, the impact of restoration on physiology of terrestrial animals has never been tested. Here, we evaluated the effect of two restoration methods on body condition measured as body size, body mass, lipid and muscle content of the spider Nephila clavipes in a tropical dry forest that has suffered chronic disturbance due to cattle grazing. We used experimental plots that had been excluded from disturbance by cattle grazing during eight years. Plots were either planted with native trees (i. e. maximal intervention), or only excluded from disturbance (i. e. minimal intervention), and were compared with control conserved (remnants of original forest) and disturbed plots (where cattle is allowed to graze). We predicted (1) better body condition in spiders of conserved and restored sites, compared to disturbed sites, and (2) better body condition in plots with maximal intervention than in plots with minimal intervention. The first prediction was not supported in males or females, and the second prediction was only supported in females: body dry mass was higher in planted than in conserved plots for spiders of both sexes and also higher that in disturbed plots for males, suggesting that plantings are providing more resources. We discuss how different life histories and environmental pressures, such as food availability, parasitism, and competition for resources can explain our contrasting findings in male and female spiders. By studying animal physiology in restoration experiments it is possible to understand the mechanistic basis of ecological and evolutionary processes that determine success of ecological restoration.

No MeSH data available.


Related in: MedlinePlus