scholarly journals Cryptic alternative male mating strategies in invasive alien round goby (Neogobius melanostomus) of the upper Danube River

2020 ◽  
Author(s):  
Alexander F. Cerwenka ◽  
Joerg Brandner ◽  
Juergen Geist ◽  
Ulrich K. Schliewen
Keyword(s):  
Life History ◽  
Sexual Maturity ◽  
Round Goby ◽  
Trophic Niche ◽  
Mating Strategies ◽  
Neogobius Melanostomus ◽  
Danube River ◽  
Life History Strategies ◽  
Male Mating ◽  
Male Mating Strategies

Abstract Male alternative mating strategies are a widespread life history choice, yet they have hardly been assessed in the context of fish invasions. As established proxies for alternative life-history strategies, body length and sexual maturity of Ponto–Caspian round goby (Neogobius melanostomus) from the recently invaded upper Danube River were contrasted and differential trophic niche occupation was assessed. Only about 4% of analyzed gobies qualified as potential sneakers which may be explained by the recent and ongoing invasion process. This study provides evidence for the occurrence of sneaking behavior of invasive round goby in the upper Danube River.

scholarly journals Paternity in wild ring‐tailed lemurs ( Lemur catta ): Implications for male mating strategies

2016 ◽  
Vol 78 (12) ◽  
pp. 1316-1325 ◽  
Author(s):  
Joyce A. Parga ◽  
Michelle L. Sauther ◽  
Frank P. Cuozzo ◽  
Ibrahim Antho Youssouf Jacky ◽  
Richard R. Lawler ◽  
...  
Keyword(s):  
Lemur Catta ◽  
Mating Strategies ◽  
Male Mating ◽  
Male Mating Strategies

scholarly journals Life-history strategies associated to reproduction of three Hyphessobrycon species (Characidae) in lentic environments of upper Paraná River basin

2013 ◽  
Vol 25 (4) ◽  
pp. 398-405 ◽  
Author(s):  
Cristina da Silva Gonçalves ◽  
Ursulla Pereira Souza ◽  
Fabio Cop Ferreira ◽  
Alexandre Peressin ◽  
Francisco Manoel de Souza Braga
Keyword(s):  
Life History ◽  
River Basin ◽  
Sexual Maturity ◽  
Life History Strategies ◽  
Oxbow Lakes ◽  
Parana River ◽  
Three Samples ◽  
Size At Sexual Maturity ◽  
Upper Paraná River ◽  
Upper Paraná River Basin

AIM: Life-history strategies in fish include essential parameters related to offspring survivorship, fecundity and time of reproduction, which represent adaptive traits that enable a species to deal with spatial and temporal variability of abiotic conditions. This study aimed to compare reproductive traits associated to life-history theory for three Hyphessobrycon species from two lentic environments (four natural oxbow lakes and a man-made reservoir) of Mogi Guaçu River, upper Paraná River basin. METHODS: Specimens were collected with four minnow traps between August 2005 and July 2006 to cover dry and wet seasons (three samples in each season, and three samples in each environment). RESULTS: Reproductive strategy of H. bifasciatus and H. eques, which predominated in the oxbow lakes, differed from H. anisitsi in the reservoir. Hyphessobrycon bifasciatus and H. eques were single spawners with lower fecundity and size at sexual maturity, but invested more in number of eggs per body gram, while H. anisitsi was a multiple spawner species with higher fecundity, larger size at sexual maturity and body size. CONCLUSIONS: In seasonal environments, single spawners are synchronized with the floods to maximize juvenile survivorship, while reservoirs harbors multiple spawners’ fish due to the reduced fluctuation between high and low floods resulting from dam operation. Therefore, the seasonal condition in the oxbow lakes due to the flood pulse favored single spawners’ tactic, as showed by H. bifasciatus and H. eques. In contrast, the multiple spawning of H. anisitsi seems to be related to the more stable environmental condition throughout the year provided by the dam. Life-histories reported herein to Hyphessobrycon species must be common to other characid fishes inhabiting similar environments.

scholarly journals Human Life History Strategies

2016 ◽  
Vol 15 (1) ◽  
pp. 147470491667734 ◽  
Author(s):  
Kristine J. Chua ◽  
Aaron W. Lukaszewski ◽  
DeMond M. Grant ◽  
Oliver Sng
Keyword(s):  
Life History ◽  
Health Status ◽  
Latent Variable ◽  
Structural Equation Models ◽  
Human Life ◽  
Mating Strategies ◽  
Life History Strategies ◽  
Environmental Cues ◽  
Behavioral Phenotypes ◽  
Wide Range

Human life history (LH) strategies are theoretically regulated by developmental exposure to environmental cues that ancestrally predicted LH-relevant world states (e.g., risk of morbidity–mortality). Recent modeling work has raised the question of whether the association of childhood family factors with adult LH variation arises via (i) direct sampling of external environmental cues during development and/or (ii) calibration of LH strategies to internal somatic condition (i.e., health), which itself reflects exposure to variably favorable environments. The present research tested between these possibilities through three online surveys involving a total of over 26,000 participants. Participants completed questionnaires assessing components of self-reported environmental harshness (i.e., socioeconomic status, family neglect, and neighborhood crime), health status, and various LH-related psychological and behavioral phenotypes (e.g., mating strategies, paranoia, and anxiety), modeled as a unidimensional latent variable. Structural equation models suggested that exposure to harsh ecologies had direct effects on latent LH strategy as well as indirect effects on latent LH strategy mediated via health status. These findings suggest that human LH strategies may be calibrated to both external and internal cues and that such calibrational effects manifest in a wide range of psychological and behavioral phenotypes.

Interplay of male traits, male mating strategies and female mate choice in the Asian elephant, Elephas maximus

Behaviour ◽  
2015 ◽  
Vol 152 (7-8) ◽  
pp. 1113-1144 ◽  
Author(s):  
Karpagam Chelliah ◽  
Raman Sukumar
Keyword(s):  
Mate Choice ◽  
Mate Guarding ◽  
Female Mate Choice ◽  
Mating Strategies ◽  
Asian Elephant ◽  
Dominant Male ◽  
Male Mating ◽  
Male Body ◽  
Female Mate ◽  
Male Mating Strategies

Elaborate male traits with no apparent adaptive value may have evolved through female mate discrimination. Tusks are an elaborate male-only trait in the Asian elephant that could potentially influence female mate choice. We examined the effect of male body size, tusk possession and musth status on female mate choice in an Asian elephant population. Large/musth males received positive responses from oestrous females towards courtship significantly more often than did small/non-musth males. Young, tusked non-musth males attempted courtship significantly more often than their tuskless peers, and received more positive responses (though statistically insignificant) than did tuskless males. A positive response did not necessarily translate into mating because of mate-guarding by a dominant male. Female elephants appear to choose mates based primarily on traits such as musth that signal direct fertility benefits through increased sperm received than for traits such as tusks that may signal only indirect fitness benefits.

scholarly journals Correlates of Male Mating Strategies in White Rhinos (Ceratotherium simum)

1998 ◽  
Vol 79 (4) ◽  
pp. 1317-1324 ◽  
Author(s):  
J. L. Rachlow ◽  
E. V. Berkeley ◽  
J. Berger
Keyword(s):  
Mating Strategies ◽  
Male Mating ◽  
Ceratotherium Simum ◽  
Male Mating Strategies

Resources, not male mating strategies, are a determinant of social structure in Gunnison's prairie dogs (Cynomys gunnisoni)

Behaviour ◽  
2007 ◽  
Vol 144 (11) ◽  
pp. 1361-1382 ◽  
Author(s):  
Keyword(s):  
Home Range ◽  
Social Structure ◽  
Home Range Size ◽  
Mating Strategies ◽  
Prairie Dogs ◽  
Territory Size ◽  
Male Mating ◽  
Cynomys Gunnisoni ◽  
Male Mating Strategies ◽  
Gunnison's Prairie Dogs

AbstractPrevious studies of Gunnison's prairie dogs, Cynomys gunnisoni, have reached different conclusions about the factors influencing sociality in this species. In this study I tested whether Gunnison's prairie dog social structure was resource-based or whether male mating strategies drive the organizational patterns observed. Group size, where the term group refers to individuals occupying the same territory, was predicted by territory size and density of food available. The spatial overlap of adults within territories was positively correlated with spatial patchiness of food resources. All group members participated in territory defense, although adult males engaged in significantly more intergroup aggressive interactions. There was no significant difference in adult male and female home range size. The number of female home ranges that any given male home range overlapped was not correlated with male body mass, male home range size, or territory size. Contrary to predictions of typical mammalian male mating strategies, adult females ranged significantly further than males during the mating period. Body mass of males and nonreproductive females was similar, whereas that of reproductive females was smaller. In addition, males and females did not differ in size, based on skull length and skull width. Results from this study strongly suggest that patterns of space use and social structure in Gunnison's prairie dogs are the result of individual responses to resource abundance and distribution and are not due to male mating strategies, such as resource defense or female defense polygyny.

Sign in / Sign up

Export Citation Format

Share Document