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Abiotic drivers shape seed inputs and outputs in a tropical wetland on Croton trinitatis population

Ecological Processes 2022年第1期11卷 65-77页

作者： Francielli Bao Arnildo Pott Pedro Manuel Villa Centro de Avaliação da Biodiversidade Pesquisa e Conservação do Cerrado(CBC)Instituto Chico Mendes de Conservação da Biodiversidade(ICMBio)BrasíliaDF 70670-350Brazil Programa de Pós-Graduação em Biologia Vegetal Instituto de BiociênciasUniversidade Federal de Mato Grosso do SulCampo GrandeMS 79070-900Brazil Programa de Pós-Graduacão em Botânica Departamento de Biologia VegetalUniversidade Federal de ViçosaViçosaMG 36570-900Brazil Fundación para la Conservación de la Biodiversidad Mérida 7101Venezuela

Background:Predicting how natural and anthropogenic drivers shape different ecological indicators,such as plant populations along environmental gradients,can be a relevant tool for establishing management and conservation criteria of tropical *** aimed to assess the effects of seasonal flood disturbance,type of grasslands and topographical conditions on Croton trinitatis population distribution in a tropical ***:The study was carried out in a seasonally flooded grassland(Central-West Brazil).We conducted samplings of soil on the dry and flood hydrophases of the *** took the samples in eight seasonal ponds,with 1 km interval between *** were marked during the flood period,observing the water level,one in the lowest zone,in the middle of the pond=low(ca.60 cm deep),one at the pond edge=mid(ca.30 cm deep)and one in the higher zone,on the external part=high(ca.1 cm deep).Results:The results showed that the topography,seasonality,and types of grassland determine differences in the abundance patterns of adult plants and seedlings,and seed bank and seed *** abiotic factors can shape plant population-related ecological processes and patterns,with outputs(germination and predation)and inputs(local dispersion and from neighbouring areas)of proportional seeds for the population maintenance in this ***:We emphasize the importance of these findings,to show that abiotic factors are not the only ones to be considered in ecological studies of distribution and structuring of populations in habitats with extreme seasonal events.

关键词： Environmental filter Flood disturbance Pantanal population ecology Seasonal change Seed predation Seedling Soil seed bank

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It is time to mate: population-level plasticity of wild boar reproductive timing and synchrony in a changing environment

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Current Zoology 2022年第4期68卷 371-380页

作者： Rudy Brogi Enrico Merli Stefano Grignolio Roberta Chirichella Elisa Bottero Marco Apollonio Department of Veterinary Medicine University of Sassarivia Vienna 2Sassari I-07100Italy

On a population level,individual plasticity in reproductive phenology can provoke either anticipations or delays in the average reproductive timing in response to environmental ***,a rigid reliance on photoperiodism can constraint such plastic responses in populations inhabiting temperate *** regulation of breeding season length may represent a further tool for populations facing changing ***,this skill was reported only for equatorial,nonphotoperiodic *** goal was to evaluate whether species living in temperate regions and relying on photoperiodism to trigger their reproduction may also be able to regulate breeding season *** 10 years,we collected 2,500 female reproductive traits of a mammal model species(wild boar Sus scrofa)and applied a novel analytical approach to reproductive patterns in order to observe population-level variations of reproductive timing and synchrony under different weather and resources availability *** favorable conditions,breeding seasons were anticipated and population synchrony increased(i.e.,shorter breeding seasons).Conversely,poor conditions induced delayed and less synchronous(i.e.,longer)breeding *** potential to regulate breeding season length depending on environmental conditions may entail a high resilience of the population reproductive patterns against environmental changes,as highlighted by the fact that almost all mature females were reproductive every year.

关键词： breeding season length phenology photoperiodism population ecology reproduction wild boar

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Ecological differences of south polar skua populations from Fildes Peninsula of King George Island and eastern Larsemann Hills, Antarctica

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Chinese Journal of Polar Science 2004年第2期15卷 98-107页

作者：王自磐 Hans-Ulrich Peter Second Institute of Oceanography SOA Hangzhou 310012 China ecology Institute of Jena University Jena D-07743 Germany

A study has been done on the comparison of nesting and feeding behavior, population variances as well as breeding success between two populations of south polar skua (Catharacta maccormicki) from near Great Wall station on Fildes Peninsula and near Zhongshan station in Eastern Larsemann Hills, Antarctica. There are evident differences in their population ecology. The foraging habit is much related to regional ecosystem and food resources near their territorial area. Dependence on human food waste influences skua's diet,which considerably affects their behavior even population variation in both areas. The skuas in Zhongshan Station,could shorten and/or regulate the timing for their egg laying and hatching, and take precedence of one chick brooding, for keeping their breeding success, and subsequent species continuation.

关键词： south polar skua population ecology Antarctica.

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Microgeographic Variation and Inter-Riffle Migration of <i>Rhinichthys atratulus</i>(Pisces: Cyprinidae) in a Small Connecticut Stream, United States

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Open Journal of ecology 2020年第7期10卷 460-481页

作者： Sage J. Loomis Kayla Anatone Laura Bither Sarah J. Kang Nola Neri David Machado Michelle L. Kraczkowski Barry Chernoff College of the Environment Wesleyan University Middletown USA Department of Biology Wesleyan University Middletown USA Department of Molecular Biology and Biochemistry Wesleyan University Middletown USA Department of Biology University of Saint Joseph West Hartford USA Department of Earth & Environmental Sciences Wesleyan University Middletown USA

We examined the genetic diversity on a microgeographic scale of Rhinichthys atratulus (Eastern Blacknose Dace) in Allyn Brook, a small tributary in the upper Coginchaug River drainage in Connecticut. By looking at gene flow on a microgeographic scale among populations that had no physical barriers to migration, we tested the null hypothesis that the populations should be homogeneous. We resolved seven polymorphic microsatellite loci and one mitochondrial gene, nd2, in three adjacent populations (populations to the two closest populations (>5 km) in the Coginchaug River. A dam from the 1920’s in lower Allyn Brook has isolated Allyn-Brook populations from Coginchaug-River populations. Allyn Brook was selected because there are only three riffle habitats in the brook and, therefore, there can be no immigration from upstream populations. Each population has private (i.e., unique) alleles and haplotypes, and there are significant genetic differences between all sites. The Allyn Brook populations are almost as different from one another as they are from the distant populations in the Coginchaug River from which they have been isolated for more than 80 years. These results point to in situ evolution and little migration or gene flow among populations on a microgeographic scale. This raises interesting questions for conservation of genetic diversity of stream fishes.

关键词： Migration Microgeographic Differentiation population ecology Gene Flow Rhinichthys atratulus

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