scholarly journals Variation in adult shell morphology and life-history traits in the land snail Oreohelix cooperi in relation to biotic and abiotic factors

2007 ◽  
Vol 73 (2) ◽  
pp. 129-137 ◽  
Author(s):  
T. K. Anderson ◽  
K. F. Weaver ◽  
R. P. Guralnick
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Abiotic Factors ◽  
Land Snail ◽  
Shell Morphology ◽  
Biotic And Abiotic Factors

scholarly journals Relative effects of biotic and abiotic factors during early life history on recruitment dynamics: a case study

2017 ◽  
Vol 74 (7) ◽  
pp. 1125-1134 ◽  
Author(s):  
Fan Zhang ◽  
Kevin B. Reid ◽  
Thomas D. Nudds
Keyword(s):  
Life History ◽  
Yellow Perch ◽  
Lake Erie ◽  
Abiotic Factors ◽  
Zooplankton Abundance ◽  
Biotic Factors ◽  
Large Lakes ◽  
Middle Term ◽  
Biotic And Abiotic Factors ◽  
Juvenile Stages

The relative effects of biotic and abiotic factors, and the life-history stages upon which they act to affect fish recruitment, vary among species and ecosystems. We compared the effects of spawning stock biomass, and factors operating at early-term (encompassing the egg, yolk-sac larval, and first few days of swim-up larval stages), middle-term (including the swim-up larval and pelagic juvenile stages), and late-term (over the benthic juvenile stage) on recruitment by yellow perch (Perca flavescens) in the western basin of Lake Erie between 1999 and 2013. Variation of recruitment was mainly driven by middle-term effects. Then, abiotic factors, such as warming rate and wind speed, more strongly affected recruitment than did biotic factors. Among middle-term biotic factors, the top-down effect of yearling walleye (Sander vitreus) abundance was stronger than the bottom-up effect of zooplankton abundance. Similar to marine species, physical processes appear to strongly affect recruitment dynamics of Lake Erie yellow perch over its pelagic larval and juvenile stages, demonstrating the importance of physical and biological processes in understanding fish population dynamics in large lakes.

scholarly journals Determinants of life-history traits in a fish ectoparasite: a hierarchical analysis

Parasitology ◽  
2011 ◽  
Vol 138 (7) ◽  
pp. 848-857 ◽  
Author(s):  
G. LOOT ◽  
N. POULET ◽  
S. BROSSE ◽  
L. TUDESQUE ◽  
F. THOMAS ◽  
...  
Keyword(s):  
Life History ◽  
Body Size ◽  
Egg Size ◽  
Life History Traits ◽  
Abiotic Factors ◽  
Individual Characteristics ◽  
Trade Off ◽  
Individual Fitness ◽  
Parasite Number ◽  
Egg Number

SUMMARYObjective. Unravelling the determinants of parasite life-history traits in natural settings is complex. Here, we deciphered the relationships between biotic, abiotic factors and the variation in 4 life-history traits (body size, egg presence, egg number and egg size) in the fish ectoparasite Tracheliastes polycolpus. We then determined the factors affecting the strength of the trade-off between egg number and egg size. Methods. To do so, we used 4-level (parasite, microhabitat, host and environment) hierarchical models coupled to a field database. Results. Variation in life-history traits was mostly due to individual characteristics measured at the parasite level. At the microhabitat level (fins of fish hosts), parasite number was positively related to body size, egg presence and egg number. Higher parasite number on fins was positively associated with individual parasite fitness. At the host level, host body size was positively related to the individual fitness of the parasite; parasites were bigger and more fecund on bigger hosts. In contrast, factors measured at the environmental level had a weak influence on life-history traits. Finally, a site-dependent trade-off between egg number and egg size existed in this population. Conclusion. Our study illustrates the importance of considering parasite life-history traits in a hierarchical framework to decipher complex links between biotic, abiotic factors and parasite life-history traits.

scholarly journals Relative clutch mass of Basiliscus vittatus Wiegmann, 1828 (Squamata, Corytophanidae): female morphological constraints

Herpetozoa ◽  
2019 ◽  
Vol 32 ◽  
pp. 211-219
Author(s):  
Gabriel Suárez-Varón ◽  
Orlando Suárez-Rodríguez ◽  
Gisela Granados-González ◽  
Maricela Villagrán-Santa Cruz ◽  
Kevin M. Gribbins ◽  
...  
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Abiotic Factors ◽  
Reproductive Traits ◽  
The Family ◽  
In Captivity ◽  
Abiotic And Biotic Factors ◽  
Gravid Females ◽  
Favorable Conditions ◽  
Clutch Mass

Clutch size (CS) and relative clutch mass (RCM) are considered important features in life history descriptions of species within Squamata. Variations in these two characteristics are caused by both biotic and abiotic factors. The present study provides the first account related to CS and RCM ofBasiliscus vittatusin Mexico within a population that inhabits an open riverbed juxtapositioned to tropical rainforest habitat in Catemaco, Veracruz, Mexico (170 m a.s.l.). Twenty-nine gravid females were collected and kept in captivity under favorable conditions that promote oviposition. The CS within this population was 6.2 ± 0.2 and was correlated positively with snout vent-length (SVL); while the RCM was 0.17 ± 0.006 and was correlated positively with both CS and width of egg. Factors, such as female morphology and environmental conditions, should influence these reproductive traits inB. vittatus. The data collected in this study could provide a framework for comparisons of the life history traits across populations ofB. vittatusin Mexico and within other species of the family Corytophanidae and provide a model for testing how abiotic and biotic factors may influence the CS and RCM in basilisk lizards throughout their range.

The habitat harshness hypothesis revisited: life history of the isopod Excirolana braziliensis in sandy beaches with contrasting morphodynamics

2003 ◽  
Vol 83 (2) ◽  
pp. 331-340 ◽  
Author(s):  
Omar Defeo ◽  
Gastón Martínez
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Wide Spectrum ◽  
Abiotic Factors ◽  
Strong Support ◽  
Sandy Beaches ◽  
Physical Conditions ◽  
Large Populations ◽  
History Of ◽  
Pan American

Demographic and life history characteristics of the intertidal isopod Excirolana braziliensis (Isopoda: Cirolanidae) were compared between populations of two exposed sandy beaches with contrasting morphodynamics (reflective vs dissipative) during 22 consecutive months. Most population processes and life history traits did not give support for the ‘habitat harshness hypothesis’ (HHH): abundance of males, females, ovigerous females and juveniles was significantly higher at the reflective beach population, which also presented higher growth rates in size and weight with respect to the dissipative beach population. No significant differences in weight-at-length were found between beaches. Among the compared parameters, only the lower natural mortality rates at the dissipative beach gave support for the HHH. The results were not consistent with a previous analysis of Excirolana braziliensis along Pan-American beaches, which showed that this isopod occurs almost invariably in fine sands of tropical and temperate beaches. The results give strong support to recent findings that show that in macrofauna species capable of sustaining large populations across a wide spectrum of physical conditions, such as Excirolana braziliensis, beach morphodynamics should not be considered the primary factor affecting abundance and life history traits. Instead, our results reinforce the view that sandy beach populations are controlled by the intertwined forces of biotic and abiotic factors operating together.

Differences in population parameters of Rattus norvegicus in urban and rural habitats of central Argentina

Mammalia ◽  
2013 ◽  
Vol 77 (2) ◽  
Author(s):  
Isabel E. Gómez Villafañe ◽  
Regino Cavia ◽  
María Victoria Vadell ◽  
Olga V. Suárez ◽  
María Busch
Keyword(s):  
Life History ◽  
Rattus Norvegicus ◽  
Abiotic Factors ◽  
Life History Strategies ◽  
Population Parameters ◽  
Biotic And Abiotic Factors ◽  
Central Argentina ◽  
Life History Characteristics

AbstractLife history characteristics are influenced by both biotic and abiotic factors of the environment. The aim of this study was to compare the life history strategies of

Potential, realized, and actual fecundity in the crayfish Orconectes immunis from southwestern Ontario

1995 ◽  
Vol 73 (4) ◽  
pp. 672-677 ◽  
Author(s):  
Daniel P. M. Stechey ◽  
Keith M. Somers
Keyword(s):  
Life History ◽  
Abiotic Factors ◽  
Stage Iv ◽  
Reproductive Stage ◽  
Analysis Of Covariance ◽  
Biotic And Abiotic Factors ◽  
Reproductive Losses

Data on crayfish life history are limited to a few populations of only a few species. Herein we examine the size-specific fecundity of a population of Orconectes immunis from southwestern Ontario. We compare log–log regressions of ovarian egg counts, abdominal egg counts, and the number of independent stage IV juveniles with the size of females to estimate reproductive losses associated with egg extrusion and hatching. We contrast these results with data from a Michigan population. Slopes of the three allometric regressions for the Ontario population were significantly greater than zero (P < 0.05); however, the slope for the ovarian egg counts was significantly less than the hypothesized value of 3.0 (P < 0.05), suggesting that ovarian egg counts did not scale volumetrically with size of females. An analysis of covariance indicated that the slope for the ovarian egg counts differed significantly from the slopes for abdominal egg counts and the number of juveniles (P < 0.05), but the latter two regressions were parallel. The proportional decline in fecundity between ovarian and abdominal egg counts could not be estimated unequivocally because the slopes differed. By contrast, the Michigan population exhibited a 35% decline between these stages. A comparison of size-adjusted abdominal egg counts and the number of juveniles revealed a decline of 58% for the Ontario population. The observed differences in size-specific fecundity at each reproductive stage support the hypothesis that each of these parameters summarizes distinct life-history features. The roles of biotic and abiotic factors on crayfish life history warrant further study.

scholarly journals Effect of Intraspecific Larval Aggregation and Diet Type on Life-History Traits of Dermestes maculatus and Dermestes caninus (Coleoptera: Dermestidae): Species of Forensic Importance

2021 ◽  
Vol 6 (1(Special)) ◽  
pp. 83
Author(s):  
Rodrigo C. Corrêa ◽  
Rodrigo R.F. Carmo ◽  
Ann R. George ◽  
Jeffery K. Tomberlin
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Abiotic Factors ◽  
Larval Density ◽  
Biological Information ◽  
Dog Food ◽  
Dermestes Maculatus ◽  
The Impact ◽  
Density Methods ◽  
Diet Type

Introduction: Numerous studies have examined the effect of abiotic factors on the development and survival of Dermestes and their importance for forensic entomology. Dermestes maculatus is one of the most known beetle species associated with corpses and D. caninus has little biological information available and no case report records. To better understand the life-history traits of those species we evaluated the impact of diet type and intraspecific larval density. Methods: Adult beetles were collected from human remains and colonies were kept under controlled conditions (27.0 ± 1.0 °C, 55.0% RU, and 12:12 L:D) and F1 generation was used to collect eggs. Newly emerged larvae were separated according to the treatments, being the combination of larval density (1, 15, 30 individuals), food (dried dog food or dried pork) and contact (with or without). We used factorial-ANOVA to test the individual and combined effect of both larval densities and diet on dependent variables, followed by post-hoc Tukey test. Pearson correlations were carried out to evaluate the relationship between larval parameters for each species in each treatment. Results: Pork-based diet positively affected species fitness, with larvae being ca. 1.1 (D. caninus) and 1.7 (D. maculatus) times bigger and heavier than in dog food. Diet type also impacted the development time for both species. Conclusions: Data generated through the current study serve as a foundation for potential application of this species as an indicator of time of colonization in relations to a minPMI. However, validation is still needed to determine the accuracy and precision of these calculations.

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