Seasonal pattern of nutrient cycling in the Atlantic Forest across a topographic gradient

AbstractSeasonality is an important aspect associated with population dynamic and structure of tropical insect assemblages. This study evaluated the effects of seasonality on abundance, richness, diversity and composition of an insect group, drosophilids, including species native to the Neotropical region and exotic ones. Three preserved fragments of the northern Atlantic Forest were surveyed, where temperatures are above 20 °C throughout the year and rainfall regimes define two seasons (dry and rainy). As opposed to other studies about arthropods in tropical regions, we observed that abundance of drosophilids was significantly higher in the dry season, possibly due to biological aspects and the colonization strategy adopted by the exotic species in these environments. Contrarily to abundance, we did not observe a seasonal pattern for richness. As for other parts of the Atlantic Forest, the most representative Neotropical species (Drosophila willistoni, D. sturtevanti, D. paulistorum and D. prosaltans) were significantly more abundant in the rainy season. Among the most abundant exotic species, D. malerkotliana, Zaprionus indianus and Scaptodrosophila latifasciaeformis were more importantly represented the dry season, while D. simulans was more abundant in the rainy period. The seasonality patterns exhibited by the most abundant species were compared to findings published in other studies. Our results indicate that exotic species were significantly more abundant in the dry season, while native ones exhibited an opposite pattern.

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Litterfall mass and nutrient fluxes over an altitudinal gradient in the coastal Atlantic Forest, Brazil

Journal of Tropical Ecology ◽

10.1017/s0266467417000207 ◽

2017 ◽

Vol 33 (4) ◽

pp. 261-269 ◽

Cited By ~ 4

Author(s):

Eráclito Rodrigues de Sousa-Neto ◽

Sílvia Rafaela Machado Lins ◽

Susian Christian Martins ◽

Marisa de Cássia Piccolo ◽

Maurício Lamano Ferreira ◽

...

Keyword(s):

Nutrient Cycling ◽

Atlantic Forest ◽

Altitudinal Gradient ◽

Tropical Soils ◽

Reproductive Organs ◽

Northern Coast ◽

Forest Types ◽

Lowland Forest ◽

Mass Fluxes ◽

P Fluxes

Abstract:Litterfall is one of the most important pathways through which nutrients are recycled in the terrestrial biosphere. In tropical soils, which are generally low in essential nutrients such as phosphorus and cations, the flux of nutrients through litterfall is particularly important to sustaining CO2-uptake capacity; however, questions remain over the role of altitude in altering litter nutrient cycling rates among tropical forest ecosystems. Here we examine litterfall, carbon (C), nitrogen (N) and phosphorus (P) fluxes through litterfall over an altitudinal gradient in the coastal Atlantic Forest located on the northern coast of the State of São Paulo, Brazil. Litterfall was collected twice a month for 1 y (April 2007–March 2008) using 30 litter traps placed in four different forest types arrayed by altitude – coastal forest (sea level), lowland forest (50–200 m asl), submontane forest (300–500 m asl) and montane forest (1000 m asl). Litterfall mass-fluxes decreased with increasing altitude, from ~9 Mg ha−1 in lowland forests to 7 Mg ha−1 in higher-altitude ecosystems. Contribution of reproductive organs to litterfall was significantly greater in lower than in higher altitudes. Litterfall N and P fluxes were higher in the lowland forest vs. other forest types, pointing to strong altitudinal controls over nutrient cycling. Furthermore, nitrogen-use efficiency (NUE) was lower and litter δ15N was higher in the lowland site providing additional evidence for lack of N constraints to productivity in lowland of the south-eastern Atlantic Forest.

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Fenologia de Blechnum acutum (Desv.) Mett. (Blechnaceae) em Floresta Atlântica Subtropical (Phenology of Blechnum acutum (Desv.) Mett. (Blechnaceae) in Atlantic Subtropical Forest)

Revista Brasileira de Geografia Física ◽

10.26848/rbgf.v9.6.p1644-1656 ◽

2016 ◽

Vol 9 (6) ◽

pp. 1644 ◽

Cited By ~ 1

Author(s):

Thábia Ottília Hofstetter Padoin ◽

Andressa Müller ◽

Jairo Lizandro Schmitt

Keyword(s):

Atlantic Forest ◽

Environmental Variables ◽

Climatic Factors ◽

Seasonal Pattern ◽

Subtropical Forest ◽

Circular Statistics ◽

Activity Period ◽

Determining Factors ◽

The World ◽

Reproductive Events

O clima de uma área é um dos fatores determinantes da dinâmica da vegetação e a fenologia estuda a ocorrência dos eventos vegetativos e reprodutivos das plantas desencadeados principalmente pela precipitação, temperatura e fotoperíodo. Os estudos fenológicos com samambaias, no mundo, aumentaram nas últimas décadas, porém os seus resultados são geralmente descritivos e restritos a poucos locais e a poucas espécies. Foram determinados o padrão e a sazonalidade das fenofases de Blechnum acutum, em Floresta Atlântica subtropical, relacionando-as com os fatores climáticos, a partir do monitoramento de 20 indivíduos, durante 18 meses. Para verificar a sazonalidade das fenofases foi utilizada a estatística circular. Blechnum acutum apresentou maior intensidade da renovação foliar em janeiro (38%), com maior período de atividade entre janeiro e abril de 2014. A formação de esporângios foi a fenofase que demonstrou o padrão sazonal mais evidente e ocorreu com maior intensidade e atividade em outubro de 2014 (25%). A senescência foliar manifestou maior intensidade em fevereiro de 2014 (23%), com 80% dos indivíduos encontrando-se nesta fenofase, em março de 2015. Os padrões fenológicos não demonstraram a mesma continuidade e regularidade em decorrência principalmente da falta de homogeneidade na manifestação da renovação e senescência das folhas pelos indivíduos na população. Os ritmos fenológicos de B. acutum também não foram igualmente influenciados pelas variáveis ambientais analisadas, sendo que a renovação foliar foi a única fenofase relacionada com temperatura e fotoperíodo. A B S T R A C T The climate of an area is one of the determining factors of the vegetation’s dynamics and phenology studies. The occurrence of vegetative and reproductive events of plants mainly triggered by rainfall, temperature and photoperiod. The phenological studies with ferns in the world have increased in recent decades, but the results are usually descriptive and restricted to few places and few species. It was determined the pattern and seasonality of phenophases of Blechnum acutum in subtropical Atlantic Forest, relating them to the climatic factors, from monitoring 20 individuals for 18 months. To check the seasonality of phenophases the circular statistics were used. Blechnum acutum showed greater intensity of foliar renovation in January (38%), with higher activity period between January and April 2014. The sporangia formation was the phenophase that showed the most obvious seasonal pattern and was more intense and activity in October 2014 (25%). The leaf senescence showed greater intensity in February 2014 (23%), with 80% of individuals meeting in this phenophase in March 2015. The phenological patterns did not show the same continuity and regularity mainly due to the lack of homogeneity in the manifestation renewal and senescence of leaves by individuals in the population. The phenological rhythms of B. acutum were not also influenced by environmental variables, and the leaf renewal was the only phenophase related to temperature and photoperiod. Keywords: climate, photoperiod, sazonality, phenophase, fern.[1]

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Effect of selective logging on forest structure and nutrient cycling in a seasonally dry Brazilian Atlantic forest

Journal of Biogeography ◽

10.1111/j.1365-2699.2005.01453.x ◽

2006 ◽

Vol 33 (3) ◽

pp. 506-516 ◽

Cited By ~ 58

Author(s):

Dora Maria Villela ◽

Marcelo T. Nascimento ◽

Luiz Eduardo O. C. Aragao ◽

Deborah M. da Gama

Keyword(s):

Nutrient Cycling ◽

Atlantic Forest ◽

Forest Structure ◽

Selective Logging ◽

Brazilian Atlantic Forest ◽

Seasonally Dry

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Domestic dogs in Atlantic forest preserves of south-eastern Brazil: a camera-trapping study on patterns of entrance and site occupancy rates

Brazilian Journal of Biology ◽

10.1590/s1519-69842008000400011 ◽

2008 ◽

Vol 68 (4) ◽

pp. 771-779 ◽

Cited By ~ 34

Author(s):

AC. Srbek-Araujo ◽

AG. Chiarello

Keyword(s):

Atlantic Forest ◽

Seasonal Pattern ◽

Site Occupancy ◽

Camera Traps ◽

Domestic Dogs ◽

Canis Lupus Familiaris ◽

Mammal Species ◽

South Eastern ◽

Eastern Brazil ◽

Potential Impact

Presence of exotic species in forest remnants is a major concern for the conservation of wild species, not only on islands, where potential impact is higher. Although the problem is widespread and increasing, there are few studies on Neotropical forests. Here we quantify the occurrence of domestic dogs (Canis lupus familiaris) in an Atlantic forest reserve in south-eastern Brazil (Santa Lúcia Biological Station - SLBS). Throughout two years of monitoring with camera traps (2,142 camera-days), 25 records of 16 individual dogs were obtained in the interior of SLBS, making dogs the fourth most frequently recorded species of mammals in general and the first-ranking among Carnivora, ahead of the ocelot and puma, the top two terrestrial predators present in SLBS. Dogs entered the forest year round, in almost half of the sampled months (48%), and predominantly during daytime (89%). They were detected in various trails inside the reserve, but mostly in areas nearest to the reserve's border (<200 m from the edge). Record rates of domestic dogs did not correlate significantly with climate variables, with frequency of mammal records and richness in general, or with any particular mammal species (Spearman rank correlation, p > 0.05 in all cases), suggesting an erratic, non-seasonal pattern of entrance in the reserve. Data indicate that domestic dogs can be abundant and frequent visitors to little disturbed Atlantic forest reserves even when these are located in regions of low density of human population. The potential impact to native fauna is discussed.

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Ecological and Environmental Aspects of Nutrient Cycling in the Atlantic Forest, Brazil

Tropical Forests - The Challenges of Maintaining Ecosystem Services while Managing the Landscape ◽

10.5772/64188 ◽

2016 ◽

Author(s):

Márcio Viera ◽

Marcos Vinicius Winckler Caldeira ◽

Franciele Francisca Marmentini Rovani ◽

Kallil Chaves Castro

Keyword(s):

Nutrient Cycling ◽

Atlantic Forest ◽

Environmental Aspects

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Seasonal Pattern of Nutrient Limitation in a Eutrophic Lake and Quantitative Analysis of the Impacts from Internal Nutrient Cycling

Environmental Science & Technology ◽

10.1021/acs.est.9b04266 ◽

2019 ◽

Vol 53 (23) ◽

pp. 13675-13686 ◽

Cited By ~ 3

Author(s):

Mengzhu Wang ◽

Xiwen Xu ◽

Zhen Wu ◽

Xiaoqian Zhang ◽

Peizhe Sun ◽

...

Keyword(s):

Quantitative Analysis ◽

Nutrient Cycling ◽

Nutrient Limitation ◽

Seasonal Pattern ◽

Eutrophic Lake

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Lake warming intensifies the seasonal pattern of internal nutrient cycling in the eutrophic lake and potential impacts on algal blooms

Water Research ◽

10.1016/j.watres.2020.116570 ◽

2021 ◽

Vol 188 ◽

pp. 116570

Author(s):

Tong Yindong ◽

Xu Xiwen ◽

Qi Miao ◽

Sun Jingjing ◽

Zhang Yiyan ◽

...

Keyword(s):

Nutrient Cycling ◽

Algal Blooms ◽

Seasonal Pattern ◽

Eutrophic Lake

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Litterfall, Decomposition and Nutrient Release in Sacred Forests of Western Odisha, India.

10.21203/rs.3.rs-73632/v1 ◽

2020 ◽

Author(s):

Antaryami Pradhan ◽

Niranjan Behera

Keyword(s):

Nutrient Cycling ◽

Ecosystem Functioning ◽

Seasonal Pattern ◽

Terrestrial Ecosystem ◽

Nutrient Release ◽

Agricultural Landscapes ◽

Ecosystem Functions ◽

Litter Bag ◽

Significant Difference ◽

Sacred Forests

Abstract Background Recognizing that litterfall and decomposition are key ecosystem functions for ecosystem stability in a terrestrial ecosystem, litterfall and decomposition in four sacred forests were studied from western part of Odisha. The present study focuses on the detailed aspects of litter dynamics, decomposition and consequent release of nutrients to the forest floor. The results obtained in this study will be beneficial in understanding the ecosystem functioning associated with nutrient cycling, which helps in determining possible management strategies for optimization of ecosystem functioning and productivity of these sacred forests. Results Litterfall and standing litter showed a seasonal pattern with most of the litter accumulated during the dry seasons and lowest in the rainy season. However, no significant difference was observed between the litterfall patterns of the sacred forests. The annual turnover rate (KL) was found to be in the range of 3.59/yr to 4.22/yr in studied sacred forests. The litter decomposition study was performed by litter bag technique and almost 95% of mass loss was observed within a period of 6 months. Such fast decomposition leads to faster rate of nutrient release across the sites. The studied elements can be set in the following order as regards to their return to the topsoil during decomposition in the order of K (Potassium) > N (Nitrogen) > P (Phosphorus). The approximate amount of nutrient released to the forest soil is quantified in the range of 184.76 to 33.61kg/ha of NPK (Nitrogen, Phosphorus and Potassium) in different sacred forests.Conclusion Such nutrient release and dynamics in sacred forests, may contribute an effective nutrient flow to the topsoil as well as to the surrounding agricultural landscapes boosting agricultural productivity and sustainability. This signifies the role of sacred forests in rendering an important ecological service in terms of nutrient cycling.

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