scholarly journals Population-level responses of life history traits to flow regime in three common stream fish species

Ecohydrology ◽  
2016 ◽  
Vol 9 (7) ◽  
pp. 1388-1399 ◽  
Author(s):  
Micah G. Bennett ◽  
Matt R. Whiles ◽  
Gregory W. Whitledge
Keyword(s):  
Life History ◽  
Flow Regime ◽  
Fish Species ◽  
Life History Traits ◽  
Population Level ◽  
Stream Fish

scholarly journals Intraspecific phenotypic variation in life history traits ofDaphnia galeatapopulations in response to fish kairomones

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e5746 ◽  
Author(s):  
Verena Tams ◽  
Jennifer Lüneburg ◽  
Laura Seddar ◽  
Jan-Phillip Detampel ◽  
Mathilde Cordellier
Keyword(s):  
Life History ◽  
Environmental Change ◽  
Phenotypic Variation ◽  
Life History Traits ◽  
Common Garden ◽  
Population Level ◽  
Geometric Morphometric ◽  
Fish Kairomones ◽  
Geometric Morphometric Analysis ◽  
Clonal Lines

Phenotypic plasticity is the ability of a genotype to produce different phenotypes depending on the environment. It has an influence on the adaptive potential to environmental change and the capability to adapt locally. Adaptation to environmental change happens at the population level, thereby contributing to genotypic and phenotypic variation within a species. Predation is an important ecological factor structuring communities and maintaining species diversity. Prey developed different strategies to reduce their vulnerability to predators by changing their behaviour, their morphology or their life history. Predator-induced life history responses inDaphniahave been investigated for decades, but intra-and inter-population variability was rarely addressed explicitly. We addressed this issue by conducting a common garden experiment with 24 clonal lines of EuropeanDaphnia galeataoriginating from four populations, each represented by six clonal lines. We recorded life history traits in the absence and presence of fish kairomones. Additionally, we looked at the shape of experimental individuals by conducting a geometric morphometric analysis, thus assessing predator-induced morphometric changes. Our data revealed high intraspecific phenotypic variation within and between fourD. galeatapopulations, the potential to locally adapt to a vertebrate predator regime as well as an effect of the fish kairomones on morphology ofD. galeata.

Impact of salinity on early life history traits of three estuarine fish species in Senegal

2009 ◽  
Vol 82 (4) ◽  
pp. 673-681 ◽  
Author(s):  
Maylis Labonne ◽  
Eric Morize ◽  
Pierre Scolan ◽  
Raymond Lae ◽  
Eric Dabas ◽  
...  
Keyword(s):  
Life History ◽  
Fish Species ◽  
Early Life ◽  
Life History Traits ◽  
Early Life History ◽  
Estuarine Fish

scholarly journals Phenotypic plasticity in fish life-history traits in two neotropical reservoirs: Petit-Saut Reservoir in French Guiana and Brokopondo Reservoir in Suriname

2009 ◽  
Vol 7 (4) ◽  
pp. 683-692 ◽  
Author(s):  
Bernard de Mérona ◽  
Jan Mol ◽  
Régis Vigouroux ◽  
Paulo de Tarso Chaves
Keyword(s):  
Life History ◽  
Phenotypic Plasticity ◽  
Fish Species ◽  
French Guiana ◽  
Life History Traits ◽  
Relative Length ◽  
Maximum Length ◽  
Batch Fecundity ◽  
Long Time ◽  
Petit Saut

Fish species are known for their large phenotypic plasticity in life-history traits in relation to environmental characteristics. Plasticity allows species to increase their fitness in a given environment. Here we examined the life-history response of fish species after an abrupt change in their environment caused by the damming of rivers. Two reservoirs of different age, both situated on the Guiana Shield, were investigated: the young Petit-Saut Reservoir in French Guiana (14 years) and the much older Brokopondo Reservoir in Suriname (44 years). Six life-history traits in 14 fish species were studied and compared to their value in the Sinnamary River prior to the completion of Petit-Saut Reservoir. The traits analyzed were maximum length, absolute and relative length at first maturation, proportion of mature oocytes in ripe gonad, batch fecundity and mean size of mature oocytes. The results revealed a general increase of reproductive effort. All species showed a decrease in maximum length. Compared to the values observed before the dam constructions, eight species had larger oocytes and three species showed an increased batch fecundity. These observed changes suggest a trend towards a pioneer strategy. The changes observed in Petit-Saut Reservoir also seemed to apply to the 30 years older Brokopondo Reservoir suggesting that these reservoirs remain in a state of immaturity for a long time.

scholarly journals The influence of oceanographic fronts and early-life-history traits on connectivity among littoral fish species

2009 ◽  
Vol 106 (5) ◽  
pp. 1473-1478 ◽  
Author(s):  
J. A. Galarza ◽  
J. Carreras-Carbonell ◽  
E. Macpherson ◽  
M. Pascual ◽  
S. Roques ◽  
...  
Keyword(s):  
Life History ◽  
Fish Species ◽  
Early Life ◽  
Life History Traits ◽  
Early Life History ◽  
Littoral Fish

Religion and fertility patterns: comparison of life history traits in Catholics and Protestants, Hallstatt (Austria) 1733–1908

2020 ◽  
pp. 1-14
Author(s):  
Alina Gavrus-Ion ◽  
Torstein Sjøvold ◽  
Miguel Hernández ◽  
Rolando González-José ◽  
Neus Martínez-Abadías ◽  
...  
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Population Level ◽  
Childhood Mortality ◽  
Social Changes ◽  
Number Of Children ◽  
First Child ◽  
The Family ◽  
Sanitary Conditions ◽  
Age At Birth

Abstract Catholicism and Protestantism have different ways of promoting the family unit that could influence survival and fertility at a population level. Parish records in the Austrian village of Hallstatt allowed the reconstruction of Catholic and Protestant genealogies over a period of 175 years (1733–1908) to evaluate how religion and social changes affected reproduction and survival. Life history traits such as lifespan beyond 15 years, number of offspring, reproductive span, children born out of wedlock and child mortality were estimated in 5678 Catholic and 3282 Protestant individuals. The interaction of sex, time and religion was checked through non-parametric factorial ANOVAs. Religion and time showed statistically significant interactions with lifespan >15 years, number of offspring and age at birth of first child. Protestants lived longer, had a larger reproductive span and an earlier age at birth of first child. Before the famine crisis of 1845–1850, Protestants showed lower values of childhood mortality than Catholics. Comparison of the number of children born out of wedlock revealed small differences between the two religions. Religion influenced reproduction and survival, as significant differences were found between Catholics and Protestants. This influence could be explained in part by differential socioeconomic characteristics, since Protestants may have enjoyed better living and sanitary conditions in Hallstatt.

scholarly journals Population declines of tuna and relatives depend on their speed of life

2015 ◽  
Vol 282 (1811) ◽  
pp. 20150322 ◽  
Author(s):  
M. J. Juan-Jordá ◽  
I. Mosqueira ◽  
J. Freire ◽  
N. K. Dulvy
Keyword(s):  
Life History ◽  
Life Histories ◽  
Life History Traits ◽  
Population Level ◽  
Maximum Size ◽  
Latitudinal Gradients ◽  
Fishing Mortality ◽  
Population Declines ◽  
Wide Range ◽  
Exploitation Status

Larger-bodied species in a wide range of taxonomic groups including mammals, fishes and birds tend to decline more steeply and are at greater risk of extinction. Yet, the diversity in life histories is governed not only by body size, but also by time-related traits. A key question is whether this size-dependency of vulnerability also holds, not just locally, but globally across a wider range of environments. We test the relative importance of size- and time-related life-history traits and fishing mortality in determining population declines and current exploitation status in tunas and their relatives. We use high-quality datasets of half a century of population trajectories combined with population-level fishing mortalities and life-history traits. Time-related traits (e.g. growth rate), rather than size-related traits (e.g. maximum size), better explain the extent and rate of declines and current exploitation status across tuna assemblages, after controlling for fishing mortality. Consequently, there is strong geographical patterning in population declines, such that populations with slower life histories (found at higher cooler latitudes) have declined most and more steeply and have a higher probability of being overfished than populations with faster life histories (found at tropical latitudes). Hence, the strong, temperature-driven, latitudinal gradients in life-history traits may underlie the global patterning of population declines, fisheries collapses and local extinctions.

Population effects and changes in life history traits in relation to phase transitions induced by long-term fishery harvesting: European hake (Merluccius merluccius) off the Balearic Islands

2009 ◽  
Vol 66 (8) ◽  
pp. 1355-1370 ◽  
Author(s):  
Manuel Hidalgo ◽  
Enric Massutí ◽  
Beatriz Guijarro ◽  
Joan Moranta ◽  
Lorenzo Ciannelli ◽  
...  
Keyword(s):  
Life History ◽  
Life History Traits ◽  
Size Structure ◽  
Sharp Decrease ◽  
Mesh Size ◽  
Population Level ◽  
Balearic Islands ◽  
Catch Per Unit Effort ◽  
Merluccius Merluccius ◽  
European Hake

In 1980 and 1995, the European hake ( Merluccius merluccius ) population off the Balearic Islands (northwestern Mediterranean) underwent changes at both the individual level and the population level. There was a sharp decrease in abundance that coincided with a change in the seasonal catch-per-unit-effort pattern in 1980. A new population scenario emerged after 1980 characterized by an increase in the intrinsic growth rate and a decrease in carrying capacity; however, catchability remained the same. An age-structure truncation could have caused these changes, making the population more dependent on year-to-year recruitment. A change in size structure also occurred in 1995, which was evidenced by a sudden decrease in the mean length-at-age (L) and abundance of recruits and a change in the density-dependent effect on recruits. As the Mediterranean trawl fishery mainly harvests recruits and juveniles and fishery harvesting induces adaptive changes in life history traits, the sharp decrease in L of recruits could be explained as a growth reduction due to the selective pressure to stay under mesh size for longer and thus maximize survival until reproduction. These individual and population transitions explain the changes in the response to the environmental forcing observed in the European hake off the Balearic Islands.

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