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Lang, G.; Marcon, E. |
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Testing randomness of spatial point patterns with the Ripley statistic |
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2013 |
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ESAIM: Probability and Statistics |
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ESAIM PS |
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17 |
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767-788 |
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Central limit theorem, goodness-of-fit test, Höffding decomposition, null, point pattern, Poisson process, null |
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Aggregation patterns are often visually detected in sets of location data. These clusters may be the result of interesting dynamics or the effect of pure randomness. We build an asymptotically Gaussian test for the hypothesis of randomness corresponding to a homogeneous Poisson point process. We first compute the exact first and second moment of the Ripley K-statistic under the homogeneous Poisson point process model. Then we prove the asymptotic normality of a vector of such statistics for different scales and compute its covariance matrix. From these results, we derive a test statistic that is chi-square distributed. By a Monte-Carlo study, we check that the test is numerically tractable even for large data sets and also correct when only a hundred of points are observed |
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EcoFoG @ webmaster @ |
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518 |
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Lambs, L.; Bompy, F.; Imbert, D.; Corenblit, D.; Dulormne, M. |
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Seawater and freshwater circulations through coastal forested wetlands on a Caribbean Island |
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Journal Article |
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2015 |
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Water |
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Water |
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7 |
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8 |
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4108-4128 |
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18O/2H stable isotope; Hydrology; Mangrove; Salinity; Swamp forest; Water level |
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Structure and composition of coastal forested wetlands are mainly controlled by local topography and soil salinity. Hydrology plays a major role in relation with tides, seaward, and freshwater inputs, landward. We report here the results of a two-year study undertaken in a coastal plain of the Guadeloupe archipelago (FWI). As elsewhere in the Caribbean islands, the study area is characterized by a micro-tidal regime and a highly seasonal climate. This work aimed at understanding groundwater dynamics and origin (seawater/freshwater) both at ecosystems and stand levels. These hydrological processes were assessed through 18O/16O and 2H/1H isotopic analyses, and from monthly monitoring of water level and soil salinity at five study sites located in mangrove (3) and swamp forest (2). Our results highlight the importance of freshwater budget imbalance during low rainfall periods. Sustained and/or delayed dry seasons cause soil salinity to rise at the mangrove/swamp forest ecotone. As current models on climate change project decreasing rainfall amounts over the inner Caribbean region, one may expect for this area an inland progression of the mangrove forest to the expense of the nearby swamp forest. © 2015 by the authors. |
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Geolab, UMR 6042, CNRS-Université Blaise Pascal, 4 rue Ledru, Clermont-Ferrand Cedex, France |
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Export Date: 8 September 2015 |
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EcoFoG @ webmaster @ |
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621 |
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Lambs, L.; Bompy, F.; Dulormne, M. |
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Using an “isotopic spike” from a tropical storm to understand water exchange on a large scale: Case study of Hurricane Rafael in the lesser antilles archipelago, October 2012 |
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2018 |
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Rapid Communications in Mass Spectrometry |
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32 |
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6 |
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457-468 |
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Rationale: Studies of wetland eco-hydrology in tropical coastal areas are scarce, and the use of water stable isotopes can be of great help. Key constraints for their analysis are (i) the small difference in delta18O values between seawater and old evaporated freshwater, and (ii) the fact that the presence of old brackish water limits the determination of the water origin and dynamic. Methods: The water from tropical storms displays distinctively depleted heavy stable isotopes, in comparison with usual tropical rainfall without strong convective thunderstorms. During tropical storms, such as Hurricane Rafael in mid-October 2012, the rainfall delta18O signal can be decreased by many units. This effect is called an “isotopic spike”, and it could be used as a temporal marker of the water fluxes. Results: Water samples, with delta18O values as low as −8.9/1000, were collected on the islands of Guadeloupe and Saint-Martin during Hurricane Rafael, whereas the usual range of groundwater or mean rainfall delta18O values is around −2.8 +/- 0.5 /1000, as measured from 2009 to 2012. These water “isotopic spikes” allow us to show a surface freshwater uptake by mangrove trees in Guadeloupe, and in Saint-Martin, to calculate the water renewal of the salt ponds and pools. Conclusions: The “isotopic spikes” generated by tropical storms are generally used to track back past storm events, as recorded in trees and stalagmites. Here, the propagation of isotopic spike is followed to improve the understanding of the freshwater circulation and the water dynamic within coastal ecosystems influenced by seawater. |
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UMR ECOFOG, Université des Antilles, Guadeloupe, Pointe-à-Pitre, 97159, France |
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Export Date: 2 September 2018 |
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EcoFoG @ webmaster @ |
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818 |
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Lamarre, G.P.A.; Molto, Q.; Fine, P.V.A.; Baraloto, C. |
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A comparison of two common flight interception traps to survey tropical arthropods |
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Journal Article |
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2012 |
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ZooKeys |
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ZooKeys |
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216 |
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43-55 |
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Flight interception trap; French Guiana; Malaise trap; Performance; Sampling strategies; Tropical forest; Windowpane trap |
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Tropical forests are predicted to harbor most of the insect diversity on earth, but few studies have been conducted to characterize insect communities in tropical forests. One major limitation is the lack of consensus on methods for insect collection. Deciding which insect trap to use is an important consideration for ecologists and entomologists, yet to date few study has presented a quantitative comparison of the results generated by standardized methods in tropical insect communities. Here, we investigate the relative performance of two flight interception traps, the windowpane trap, and the more widely used malaise trap, across a broad gradient of lowland forest types in French Guiana. The windowpane trap consistently collected significantly more Coleoptera and Blattaria than the malaise trap, which proved most effective for Diptera, Hymenoptera, and Hemiptera. Orthoptera and Lepidoptera were not well represented using either trap, suggesting the need for additional methods such as bait traps and light traps. Our results of contrasting trap performance among insect orders underscore the need for complementary trapping strategies using multiple methods for community surveys in tropical forests. |
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Department of Biology, University of Florida, Gainesville, FL 32611, United States |
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13132989 (Issn) |
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Export Date: 4 October 2012; Source: Scopus; doi: 10.3897/zookeys.216.3332; Language of Original Document: English; Correspondence Address: Lamarre, G. P. A.; UniversitéAntilles-Guyane, UMR Ecologie des Forèts de Guyane, Campus agronomique de Kourou. Avenue de France, 97310 Kourou, French Guiana; email: Greg.Lamarre@ecofog.gf |
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EcoFoG @ webmaster @ |
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438 |
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Lamarre, G.P.A.; Mendoza, I.; Rougerie, R.; Decaëns, T.; Herault, B.; Bénéluz, F. |
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Title |
Stay Out (Almost) All Night: Contrasting Responses in Flight Activity Among Tropical Moth Assemblages |
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Journal Article |
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2015 |
Publication |
Neotropical Entomology |
Abbreviated Journal |
Neotropical Entomology |
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44 |
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2 |
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109-115 |
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Behavior; diel activity; light trap; monitoring; moth; tropical forest |
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Variations in diel activity among hyperdiverse tropical communities of moths, despite representing a key component of niche partitioning between species, have barely been studied so far. Using light trapping from dawn to sunset over a 1-year period in French Guiana, we investigated these variations within and between two families of moths (Sphingidae and Saturniidae). Our results revealed contrasting patterns in flight activity at night between Sphingidae and Saturniidae. Sphingidae reached their peak in species richness and abundance between 7:00 and 8:00 p.m., followed by a decrease around 11:00 p.m. to midnight, whereas Saturniidae were continuously present throughout the night, with a peak around midnight. In addition, we found changes in diel activity among some of the most common genera in each family, highlighting distinct behavioral, physiological, and functional traits among taxa. Given differences in flight activity at different taxonomic levels, it is strongly recommended to monitor by light trapping throughout the night to effectively sample saturniid and sphingid assemblages, even though the activity of Sphingidae sharply declines after midnight. These results improve the general natural history information of tropical moths and reinforce the need of further research on the ecological and taxonomic consequences of differences in diel activity. © 2015, Sociedade Entomológica do Brasil. |
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Centre d’Ecologie Fonctionnelle et Evolutive, UMR 5175 CNRSMontpellier Cedex 5, France |
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Export Date: 9 April 2015 |
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no |
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EcoFoG @ webmaster @ |
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592 |
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Lamarre, G.P.A.; Mendoza, I.; Fine, P.V.A.; Baraloto, C. |
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Title |
Leaf synchrony and insect herbivory among tropical tree habitat specialists |
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Journal Article |
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2014 |
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Plant Ecology |
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Plant Ecol. |
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215 |
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2 |
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209-220 |
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Escape; French Guiana; Herbivorous insects; Phenology; Resource availability; Time lag |
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Growth defense tradeoff theory predicts that plants in low-resource habitats invest more energy in defense mechanisms against natural enemies than growth, whereas plants in high-resource habitats can afford higher leaf loss rates. A less-studied defense against herbivores involves the synchrony of leaf production, which can be an effective defense strategy if leaf biomass production exceeds the capacity of consumption by insects. The aim of this study was to determine whether leaf synchrony varied across habitats with different available resources and whether insects were able to track young leaf production among tree habitat specialists in a tropical forest of French Guiana. We predicted that high-resource habitats would exhibit more synchrony in leaf production due to the low cost and investment to replace leaf tissue. We also expected closer patterns of leaf synchrony and herbivory within related species, assuming that they shared herbivores. We simultaneously monitored leaf production and herbivory rates of five pairs of tree species, each composed of a specialist of terra firme or white-sand forests within the same lineage. Our prediction was not supported by the strong interaction of habitat and lineage for leaf synchrony within individuals of the same species; although habitat specialists differed in leaf synchrony within four of five lineages, the direction of the effect was variable. All species showed short time lags for the correlation between leaf production and herbivory, suggesting that insects are tightly tracking leaf production, especially for the most synchronous species. Leaf synchrony may provide an important escape defense against herbivores, and its expression appears to be constrained by both evolutionary history and environmental factors. © 2014 Springer Science+Business Media Dordrecht. |
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Department of Biology, University of Florida, Gainesville, FL, 32611, United States |
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13850237 (Issn) |
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Export Date: 24 February 2014; Source: Scopus; Coden: Plecf; Language of Original Document: English; Correspondence Address: Lamarre, G. P. A.; Université Antilles Guyane, UMR Ecologie des Forêts de Guyane, 97310 Kourou, French Guiana; email: greglamarre973@gmail.com; Funding Details: DEB-0743103/0743800, NSF, National Science Foundation |
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EcoFoG @ webmaster @ |
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530 |
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Lamarre, G.P.A.; Herault, B.; Fine, P.V.A.; Vedel, V.; Lupoli, R.; Mesones, I.; Baraloto, C. |
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Taxonomic and functional composition of arthropod assemblages across contrasting Amazonian forests |
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Journal Article |
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2016 |
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Journal of Animal Ecology |
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Journal of Animal Ecology |
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85 |
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1 |
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227-239 |
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Amazon; Arthropod community; Environmental filtering; Forest habitat; French Guiana; Functional composition; Mass sampling; Peru; Trophic cascades |
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Arthropods represent most of global biodiversity, with the highest diversity found in tropical rain forests. Nevertheless, we have a very incomplete understanding of how tropical arthropod communities are assembled. We conducted a comprehensive mass sampling of arthropod communities within three major habitat types of lowland Amazonian rain forest, including terra firme clay, white-sand and seasonally flooded forests in Peru and French Guiana. We examined how taxonomic and functional composition (at the family level) differed across these habitat types in the two regions. The overall arthropod community composition exhibited strong turnover among habitats and between regions. In particular, seasonally flooded forest habitats of both regions comprised unique assemblages. Overall, 17·7% (26 of 147) of arthropod families showed significant preferences for a particular habitat type. We present a first reproducible arthropod functional classification among the 147 taxa based on similarity among 21 functional traits describing feeding source, major mouthparts and microhabitats inhabited by each taxon. We identified seven distinct functional groups whose relative abundance contrasted strongly across the three habitats, with sap and leaf feeders showing higher abundances in terra firme clay forest. Our novel arthropod functional classification provides an important complement to link these contrasting patterns of composition to differences in forest functioning across geographical and environmental gradients. This study underlines that both environment and biogeographical processes are responsible for driving arthropod taxonomic composition while environmental filtering is the main driver of the variance in functional composition. © 2016 British Ecological Society. |
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International Center for Tropical Botany, Department of Biological Sciences, International Center for Tropical Botany, Florida International University, Miami, FL, United States |
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Cited By :1; Export Date: 17 February 2017 |
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EcoFoG @ webmaster @ |
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731 |
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Lamarre, G.P.A.; Decaëns, T.; Rougerie, R.; Barbut, J.; Dewaard, J.R.; Hebert, P.D.N.; Herbin, D.; Laguerre, M.; Thiaucourt, P.; Bonifacio Martins, M. |
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An integrative taxonomy approach unveils unknown and threatened moth species in Amazonian rainforest fragments |
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2016 |
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Insect Conservation and Diversity |
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Insect Conserv Divers |
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9 |
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5 |
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475-479 |
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Amazonian forest; Belém center of endemism; centinelan extinction; conservation; DNA barcoding; Lepidoptera; species discovery |
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This study focuses on the importance in hyperdiverse regions, such as the Amazonian forest, of accelerating and optimising the census of invertebrate communities.
We carried out low-intensity sampling of tropical moth (Lepidoptera) assemblages in disturbed forest fragments in Brazil.
We combined DNA barcoding and taxonomists’ expertise to produce fast and accurate surveys of local diversity, including the recognition and census of undescribed and endemic species.
Integrating expert knowledge of species distributions, we show that despite limited sampling effort, our approach revealed an unexpectedly high number of new and endemic species in severely threatened tropical forest fragments.
These results highlight the risk of silent centinelan extinctions and emphasise the urgent need for accelerated invertebrate surveys in high-endemism and human-impacted tropical forests. |
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1752-4598 |
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EcoFoG @ webmaster @ |
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730 |
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Lamarre, G.P.A.; Baraloto, C.; Fortunel, C.; Dávila, N.; Mesones, I.; Rios, J.G.; Ríos, M.; Valderrama, E.; Pilco, M.V.; Fine, P.V.A. |
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Herbivory, growth rates, and habitat specialization in tropical tree lineages: implications for Amazonian beta-diversity |
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2012 |
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Ecology |
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Ecology |
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93 |
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sp8 |
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S195-S210 |
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Ecological Society of America |
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0012-9658 |
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doi: 10.1890/11-0397.1 |
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EcoFoG @ webmaster @ |
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459 |
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Lamarre, G.P.A.; Amoretti, D.S.; Baraloto, C.; Bénéluz, F.; Mesones, I.; Fine, P.V.A. |
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Phylogenetic Overdispersion in Lepidoptera Communities of Amazonian White-sand Forests |
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Journal Article |
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2016 |
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Biotropica |
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Biotropica |
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48 |
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1 |
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101-109 |
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varillales; Amazon basin; Bottom-up; Lepidoptera composition; Moth, Nymphalidae; Phylogenetic structure |
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In the Amazon basin and the Guiana Shield, white-sand (WS) forests are recognized as a low-resource habitat often composed by a distinct flora with many edaphic endemic plants. Small patches of nutrient-poor white-sand forests can pose a series of challenges to plants and animals. For plants, these challenges have been shown to function as strong filters that in turn drive taxonomic, functional and phylogenetic plant composition. However, very little is known about animal communities in WS forest and the effect that low-resource availability may have on higher trophic levels. Here, we investigate the diversity of both taxonomic and phylogenetic diversity of three Lepidoptera families' (Nymphalidae, Saturniidae, and Sphingidae) assemblages between low-resource (White-Sand Forest) and two adjacent high-resource habitats, terra firme clay and seasonally flooded forests. We found no clear effect of habitat type on taxonomic composition although butterfly and moth species abundance differed among the three contrasted habitats. The WS forest Lepidoptera community is significantly more phylogenetically overdispersed than expected by chance. We suggest that these low-resource habitats filter the number of plant lineages which, in turn, creates a bottom-up control structuring Lepidoptera phylogenetic structure. We recommend long-term sampling on Lepidoptera community both at larval and adult stages that may complement this study and test hypotheses linking herbivore phylogenetic structure to plant resource availability and trophic cascade theory. © 2016 The Association for Tropical Biology and Conservation. |
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Department of Biological Sciences, International Center for Tropical Botany, Florida International University, Miami, FL, United States |
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Cited By :1; Export Date: 12 February 2016 |
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EcoFoG @ webmaster @ |
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661 |
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