A test of the abundant‐center hypothesis for stream fishes

Ecography, Год журнала: 2025, Номер unknown

Опубликована: Май 27, 2025

The abundant‐center hypothesis (ACH) provides a conceptual model for predicting range‐wide distributions of species abundance, suggesting that abundance peaks in the center geographic range and declines towards edges. Empirical studies testing ACH its subsequent derivations predominantly occurred terrestrial systems reported mixed support. Moreover, none these models consider possibility multiple areas elevated (which we refer to as ‘abundant cores'). Naturally dispersal limited may exhibit abundant cores, requiring refinement ACH. We used fish abundances from 29 206 community monitoring surveys weighted geospatial kernel density estimation identify number cores 64 freshwater species. regressed against size body test if larger sizes contain more than smaller sizes. two predictors are surrogates evolutionary age ability, respectively, because older generally associated with ranges, large‐bodied fishes have greater ability small‐bodied dendritic networks. For studied species, 43 exhibited multi‐core distributions, 21 single‐core distribution. Species size, but not was significantly positively cores. good descriptor patterns most stream studied, an be well‐suited fishes. Recent geo‐climatic events time isolated populations same by matrix unsuitable habitat and/or hard barriers, providing basis distributions. Biogeographic ecological mechanisms likely underpin observed patterns, our work indicates related concepts still present opportunities refinement.

Язык: Английский

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Changes in the climate suitability and growth rates of trees in eastern North America

Ecography, Год журнала: 2022, Номер 2022(9)

Опубликована: Июнь 16, 2022

According to the ‘fitness‐suitability' hypothesis, ongoing changes in climate are expected affect habitat suitability and hence species' fitness. In trees, differences fitness may manifest as growth rates, which will alter carbon uptake. Using tree‐ring data, we calculated > 1.5 million annual stem rate estimates (standardized for tree size) 15 677 trees representing 37 species from 558 populations throughout eastern North America. We used collections data distribution models estimate each population's climatic 1900 2010. then assessed relationships between growth, time using linear mixed‐effects models. found that rates decreased significantly through independent of were highly variable across species. Contrary expectations, negatively correlated with suitability, a relationship was consistent over gymnosperms became more negative angiosperms. These results suggest not good proxy and/or unidentified factors be slowing outweighing any potential benefits change increasing atmospheric CO 2 concentrations. Regardless cause, this finding indicates should count on increased American help offset anthropogenic emissions.

Язык: Английский

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Traits help explain species' performance away from their climate niche centre

Diversity and Distributions, Год журнала: 2023, Номер 29(8), С. 962 - 978

Опубликована: Май 30, 2023

Abstract Aim Climate change impacts on biota are variable across sites, among species and throughout individual species' ranges. Niche theory predicts that population performance should decline as site climate becomes increasingly different from the niche centre, though studies find significant variation these predictions. Here, we propose predictions about responses can be improved by incorporating trait information. Location Europe. Methods We used observations of plant abundance over time to assess in difference sensitivity (CDS), defined how (colonization, extinction change) relates mean temperature precipitation each range. then investigated if leaf economics, size seed mass traits were associated with CDS. Results Species performed better (e.g. increased abundance) towards sites progressively cooler than their centre shorter had more resource‐acquisitive leaves (i.e. lower dry matter content or LDMC) relative zero opposite pattern sensitivity. This result supports hypothesis centres stressful for a species, stature is advantageous compared taller species. The LDMC suggests environment selects strategies relatively climates growing seasons, counter expectations conservative would favoured such environments. found few consistent relationships between sensitivities traits. Main Conclusions results supported key priori foundations trait‐based dictate away centre. Furthermore, height emerged most varied CDS, suggesting will development around response change.

Язык: Английский

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ReSurveyGermany: Vegetation-plot time-series over the past hundred years in Germany

Scientific Data, Год журнала: 2022, Номер 9(1)

Опубликована: Окт. 19, 2022

Abstract Vegetation-plot resurvey data are a main source of information on terrestrial biodiversity change, with records reaching back more than one century. Although and from re-sampled plots have been published, there is not yet comprehensive open-access dataset available for analysis. Here, we compiled harmonised vegetation-plot Germany covering almost 100 years. We show the distribution plot in space, time across habitat types European Nature Information System (EUNIS). In addition, include metadata geographic location, size vegetation structure. The allow temporal change to be assessed at community scale, further into past most comparable available. They also enable tracking changes incidence individual species Germany. summary, come level detail that holds promise broadening our understanding mechanisms drivers behind plant diversity over last

Язык: Английский

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Increased Abundance Coincides with Range Expansions and Phenology Shifts: A Long-Term Case Study of Two Noctuid Moths in Sweden

Diversity, Год журнала: 2023, Номер 15(12), С. 1177 - 1177

Опубликована: Ноя. 28, 2023

Environmental and climatic changes are inducing population declines in numerous species. However, certain species demonstrate remarkable resilience, exhibiting both growth range expansion. This longitudinal study Sweden carried out over two decades (2004–2023) examines the noctuid moths Mythimna albipuncta Hoplodrina ambigua. Abundance phenology data were gathered from three light traps southeastern integrated with distribution Global Biodiversity Information Facility. In M. albipuncta, area expanded 7 to 76 occupied grids (60 km2) abundance increased 6136 individuals, while H. ambigua, 1 87 0 6937 during course of study. Furthermore, a positive yearly association was observed between number trap for each We also found significant extensions adult flight periods more than 100 days Light emerged as an effective monitoring tool, reliable proxy changes. Our findings that studied cope very well environmental Given their role dominant links primary producers higher trophic levels, shifts these ecological engineers have potential cascade up down ecosystem.

Язык: Английский

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