Ecological and life‐history correlates of erythrocyte size and shape in Lepidosauria

Penman, Zachary; Deeming, D. C.; Soulsbury, Carl D.

doi:10.1111/jeb.14004

Cited by 6 publications

(6 citation statements)

References 100 publications

(157 reference statements)

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“…Our results indicate that methodological concerns can also be raised in the field of erythrocyte morphology, which has become of growing interest over the last two decades (e.g. [ 2 , 4 , 15 , 34 , 35 ]). Many studies analysing N : C and elongation ratio did not evaluate the relationships between traits used for the derivation of the ratio [ 15 , 34 , 36 – 41 ].…”

Section: Resultsmentioning

confidence: 93%

“…[2,4,15,34,35]). Many studies analysing N : C and elongation ratio did not evaluate the relationships between traits used for the derivation of the ratio [15,34,[36][37][38][39][40][41]. That also includes a recent study that tested the relationship between cell size and relative nucleus size, similarly as in our research, royalsocietypublishing.org/journal/rsos R. Soc.…”

Section: Resultsmentioning

confidence: 99%

“…Conceivably, under equal erythrocyte count, the size of erythrocytes correlates with blood density and viscosity [ 13 ]. In turn, more elongated erythrocytes can move more easily through vessels [ 14 , 15 ]. High blood viscosity impedes blood circulation and thus elevates the workload of the cardiovascular system.…”

Section: Introductionmentioning

confidence: 99%

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Scaling of erythrocyte shape and nucleus size among squamate reptiles: reanalysis points to constrained, proportional rather than adaptive changes

2023

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Small erythrocytes might be beneficial for blood rheology, as they contribute less to blood viscosity than large erythrocytes. We predicted that rheological disadvantages of larger erythrocytes could be alleviated by relatively smaller nucleus size in larger cells allowing higher flexibility and by more elongated shape. Across squamate reptiles, we found that species with larger erythrocytes tend to have smaller ratio of nucleus size to cell size (N : C ratio), but that larger erythrocytes tend to be rounder, not more elongated. Nevertheless, we document that in fact nucleus area changes with erythrocyte area more or less linearly, which is also true for the relationship between cell length and cell width. These linear relationships suggest that nucleus size and cell size, and cell width and cell length, might be constrained to largely proportional mutual changes. The shifts in widely used N : C ratio and elongation ratio (cell length/cell width) with cell size might be misleading, as they do not reflect adaptive or maladaptive changes of erythrocytes, but rather mathematically trivial scaling of the ratios of two variables with a linear relationship with non-zero intercepts. We warn that ratio scaling without analyses of underlying patterns of evolutionary changes can lead to misinterpretation of evolutionary processes.

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 99%

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Scaling of erythrocyte shape and nucleus size among squamate reptiles: reanalysis points to constrained, proportional rather than adaptive changes

2023

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“…For every model, each MCMC chain was run for 100,000 interactions with a burn-in of 25,000 and setting the model thinning parameter to 50. (for a two-tailed test), which is analogous to a frequentist p-value (Penman et al, 2022). Regarding the random structure, we obtained the posterior means of each term and compared its magnitude between each other and if they deviated from zero, to assess their relative importance.…”

Section: Discussionmentioning

confidence: 99%

Species‐level drivers of avian centrality within seed‐dispersal networks across different levels of organisation

Moulatlet

Dáttilo

Villalobos

2023

Journal of Animal Ecology

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Bird–plant seed‐dispersal networks are structural components of ecosystems. The role of bird species in seed‐dispersal networks (from less [peripheral] to more connected [central]), determines the interaction patterns and their ecosystem services. These roles may be driven by morphological and functional traits as well as evolutionary, geographical and environmental properties acting at different spatial extents. It is still unknown if such drivers are equally important in determining species centrality at different network levels, from individual local networks to the global meta‐network representing interactions across all local networks. Using 308 networks covering five continents and 11 biogeographical regions, we show that at the global meta‐network level species' range size was the most important driver of species centrality, with more central species having larger range sizes, which would facilitate the interaction with a higher number of plants and thus the maintenance of seed‐dispersal interactions. At the local network level, body mass was the only driver with a significant effect, implying that local factors related to resource availability are more important at this level of network organisation than those related to broad spatial factors such as range sizes. This could also be related to the mismatch between species‐level traits, which do not consider intraspecific variation, and the local networks that can depend on such variation. Taken together, our results show that the drivers determining species centrality are relative to the levels of network organisation, suggesting that prediction of species functional roles in seed‐dispersal interactions requires combined local and global approaches.

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“…The more posterior mean values deviated from zero, the stronger the effects. Also, we assessed variable significance by looking at the Particle Markov chain Monte Carlo (pMCMC), which is the proportion of coefficients in the posterior distribution estimates that are different from 0, multiplied by two (for a two-tailed test), which is analogous to a frequentist p-value 77 . Regarding the random structure, we obtained the posterior means of each term and compared its magnitude between each other and if they deviated from zero, to assess their relative importance.…”

Section: Discussionmentioning

confidence: 99%

Species-level drivers of avian centrality within seed-dispersal networks across different levels of organization

Moulatlet

Dáttilo

Villalobos

2022

Preprint

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Bird-plant seed-dispersal networks are structural components of ecosystems and have been used to assess species’ functional roles. The role that bird species play in seed-dispersal networks (from less connected [peripheral] to more connected [central]), determine the interaction patterns and their ecosystem services. These roles may be determined by drivers related to morphological and functional traits, evolutionary properties, geography, and environmental conditions acting at different spatial and temporal scales. However, it is still unknown if such drivers are equally important in determining species centrality at different network levels, from individual local networks to the global meta-network representing interactions across all local networks. Here, using a dataset of 314 local networks covering five continents and eleven biogeographic regions, we show that drivers related to geography are more important in explaining species centrality in the meta-network, but these drivers were not as important in local networks. At the global meta-network level, we found that species’ range size was the most important driver with more central species having larger range sizes, which would facilitate the interaction with a higher number of plant species and thus the maintenance of seed-dispersal interaction patterns at the global scale. Morphological traits such as beak width, body mass, and wing length had secondary explanatory power. At the local network level, none of the tested drivers of centrality had significant effects, perhaps because local factors related to resource availability are more important at this scale. Taken together, our results show that the drivers determining species centrality are scale dependent, suggesting that prediction and protection of species functional roles in seed-dispersal interactions requires a combined local and global approach.

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Ecological and life‐history correlates of erythrocyte size and shape in Lepidosauria

Cited by 6 publications

References 100 publications

Scaling of erythrocyte shape and nucleus size among squamate reptiles: reanalysis points to constrained, proportional rather than adaptive changes

Scaling of erythrocyte shape and nucleus size among squamate reptiles: reanalysis points to constrained, proportional rather than adaptive changes

Species‐level drivers of avian centrality within seed‐dispersal networks across different levels of organisation

Species-level drivers of avian centrality within seed-dispersal networks across different levels of organization

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