Individual dietary specialization reduces intraspecific competition, rather than feeding activity, in black amur bream (Megalobrama terminalis)

Xia, Yingli; Li, Yuefei; Zhu, Shuli; Li, Jie; Li, Shanghao; Li, Xinhui

doi:10.1038/s41598-020-74997-8

Cited by 17 publications

(20 citation statements)

References 57 publications

(74 reference statements)

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“…Interactions among species and environmental conditions may vary over time, influencing both individual and population niches. Our study, brings novel insights to the understanding of individual and population niche variation of animals on a large time perspective through changes in competition levels, whereas the majority of studies primarily focus on short and seasonal dynamics (Bolnick et al 2010, Araújo et al 2011, Cloyed and Eason 2016, Costa‐Pereira et al 2019, Xia et al 2020).…”

Section: Discussionmentioning

confidence: 99%

“…This response to a reversal of the intensity of intraspecific competition is in accordance with both theoretical considerations (Roughgarden 1972, Svanbäck and Bolnick 2005) and observational and experimental studies (Svanbäck and Bolnick 2007, Huss et al 2008, Araújo et al 2011), which have shown that high intraspecific competition promotes increased population niche width via individual specialization and greater between‐individual variation. The individual diet specialization towards different prey types increases the diversity and inter‐individual differences in prey utilization, thereby promoting resource partitioning among conspecific individuals, which may alleviate the effects of strong intraspecific competition (Xia et al 2020).…”

Section: Discussionmentioning

confidence: 99%

“…When resources are limited, niche differentiation plays a key role in species coexistence (Gause 1934, Hardin 1960, Johnson and Bronstein 2019. However, coexistence and competitive exclusion are strongly dependent on the amount of individual niche variation among competing species (Barabás and D'Andrea 2016, Hart et al 2016, Xia et al 2020. The degree of individual niche variation in wild populations is furthermore often subject to temporal variation in response to shifts in the ecological contexts (Araújo et al 2011, Costa-Pereira et al 2018, which impact the outcome of competitive interactions and long-term coexistence (Barabás and D'Andrea 2016, Hart et al 2016, Costa-Pereira et al 2018.…”

Section: Introductionmentioning

confidence: 99%

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The effect of inter‐ and intraspecific competition on individual and population niche widths: a four‐decade study on two interacting salmonids

Prati

Henriksen

Smalås

et al. 2021

Oikos

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Competition is assumed to shape niche widths, affecting species survival and coexistence. Expectedly, high interspecific competition will reduce population niche widths, whereas high intraspecific competition will do the opposite. Here we test in situ how intra-and interspecific competition affects trophic resource use and the individual and population niche widths of two lacustrine fish species, Arctic charr and brown trout, covering a 40 year study period with highly contrasting competitive impacts prior to and following a large-scale fish culling experiment. Initially, an overcrowded Arctic charr population dominated the study system, with brown trout being nearly absent. The culling experiment reduced the littoral Arctic charr density by 80%, whereupon brown trout gradually increased its density in the system. Thus, over the study period, the Arctic charr population went from high to low intraspecific competition, followed by increasing interspecific competition with brown trout. As hypothesized, the relaxed intraspecific competition following the experimental culling reduced individual diet specialization and compressed population niche width of Arctic charr. During the initial increase of the brown trout population, there was a large dietary overlap between the two species. Over the subsequent intensified interspecific competition from the population build-up of brown trout, their trophic niche overlap chiefly declined due to a dietary shift of Arctic charr towards enhanced zooplankton consumption. Contrary to theoretical expectations, the individual and population niche widths of Arctic charr increased with intensified interspecific competition. In contrast, the diet and niche width of brown trout remained stable over time, confirming its competitive superiority. The large-scale culling experiment and associated long-term research revealed pronounced temporal dynamics in trophic niche and resource use of the inferior competitor, substantiating that intra-and interspecific competition have large and contrasting impacts on individual and population niches.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effect of inter‐ and intraspecific competition on individual and population niche widths: a four‐decade study on two interacting salmonids

Prati

Henriksen

Smalås

et al. 2021

Oikos

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“…The overlap of SEA c and SEA B of grass carp between sampling regions was estimated and plotted. We also illustrated the stable isotope values of the potential prey by sampling and detecting or referencing relevant publications with the same study area, including (Zeng et al 2018a), (Zeng et al 2018b) and (Xia et al 2020). All data analyses were performed in R 4.0.3.…”

Section: Stable Isotope Detection and Data Analysismentioning

confidence: 99%

Regionally divergent patterns of grass carp relative abundance, feeding habits and trophic niches in the subtropical Pearl River basin

Zhang

et al. 2021

Aquat Ecol

Self Cite

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The grass carp is one of the most important herbivore consumers in aquatic ecosystems and plays key roles in controlling macrophyte abundance. To assess the trophic role of grass carp and their potential grazing pressure on macrophytes in their native range, we quantified their relative abundance (RA), diet composition and trophic niches in two major tributaries and the central delta of the Pearl River using a fish capture survey, high-throughput analysis of the 18S rDNA sequences of their gut contents, and stable isotope analysis. The grass carp RA variation among the sampling regions was explained most by river discharge range. The RA was the highest in the West River with high discharge range, and the lowest in the central delta with low discharge range. The grass carp fed primarily on Streptophyta (relative read abundance: 0.40 ± 0.33) and facultatively on Arthropoda, Rotifera, Ascomycota, and Chlorophyta. The Streptophyta proportion increased from the tributaries to the central delta. Such variation contributed most to the dietary difference among regions. Grass carp belonged to the second trophic level. The position and size of isotopic niche of grass carp differed among regions, and their niche breadth decreased from the tributaries to the central delta, as Handling Editor: Se ´bastien Villeger.

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“…For instance, M. hoffmanni is an omnivorous fish that feeds mostly on benthic creatures such as freshwater shellfish, river clams, organic detritus, and some aquatic plants [ 9 ]. M. skolkovii and M. pellegrini are omnivorous as well, however, they primarily feed on aquatic plants [ 10 ]. Importantly, in M. pellegrini , the development of the upper and lower jaws as well as the thickening of the stratum corneum have strengthened the scraping function, making it more conducive to feeding on stationary organisms [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

Population Genomics of Megalobrama Provides Insights into Evolutionary History and Dietary Adaptation

Chen

Liu

Gooneratne

et al. 2022

Biology

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Megalobrama, a genus of cyprinid fish, is an economically important freshwater fish widely distributed in major waters of China. Here, we report the genome resequencing of 180 Megalobrama fish including M. amblycephala, M. skolkovii, M. hoffmanni, and M. pellegrini. Population structure indicated that geographically divergent Megalobrama populations were separated into six subgroups. A phylogenetic tree showed that M. skolkovii was more closely related to M. pellegrini than other species and M. hoffmanni was clustered apart from other Megalobrama species, showing a high nucleotide diversity in geographic groups. Treemix validated gene flow from M. amblycephala to M. skolkovii, suggesting that introgression may provide an important source of genetic variation in the M. skolkovii populations. According to the demographic history analysis, it is speculated that Megalobrama might have been originally distributed in the Pearl River with some spread to Hainan Island and northern China due to lower sea levels during the glacial period. Whole-genome selective sweeps analysis demonstrated that M. amblycephala likely developed an enhanced energy metabolism mostly through fatty acid degradation pathways whereas M. hoffmanni possibly regulate lipid absorption via the cholesterol metabolism pathway. Taken together, this study provides a valuable genomic resource for future genetic investigations aiming to improve genome-assisted breeding of Megalobrama species.

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Individual dietary specialization reduces intraspecific competition, rather than feeding activity, in black amur bream (Megalobrama terminalis)

Cited by 17 publications

References 57 publications

The effect of inter‐ and intraspecific competition on individual and population niche widths: a four‐decade study on two interacting salmonids

The effect of inter‐ and intraspecific competition on individual and population niche widths: a four‐decade study on two interacting salmonids

Regionally divergent patterns of grass carp relative abundance, feeding habits and trophic niches in the subtropical Pearl River basin

Population Genomics of Megalobrama Provides Insights into Evolutionary History and Dietary Adaptation

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