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Additions of landscape metrics improve predictions of occurrence of species distribution models

Journal of Forestry Research 2017年第5期28卷 963-974页

作者： rica Hasui Vinícius X.silva Rogrio G.T.Cunha Flavio N.Ramos Milton C.Ribeiro Mario sacramento Marco T.P.Coelho Diego G.s.Pereira Bruno R.Ribeiro Laboratório de ecologia de Fragmentos Florestais(eCOFRAG) Instituto de Ciência da NaturezaUniversidade Federal de Alfenas Laboratório de ecologia espacial e Conservao(LeeC) Departamento de EcologiaUNESP estao de hidrobiologia e piscicultura de Furnas–eHPF Programa de Pós-Graduao em ecologia e evoluo da Universidade Federal de Goiás Universidade Federal de Goiás departamento de Ciências Florestais Universidade Federal de LavrasCmpus Universitário

species distribution models are used to aid our understanding of the processes driving the spatial patterns of species’ habitats. This approach has received criticism, however, largely because it neglects landscape metrics. We examined the relative impacts of landscape predictors on the accuracy of habitat models by constructing distribution models at regional scales incorporating environmental variables (climate, topography, vegetation, and soil types) and secondary species occurrence data, and using them to predict the occurrence of 36 species in 15 forest fragments where we conducted rapid surveys. We then selected six landscape predictors at the landscape scale and ran general linear models of species presence/absence with either a single scale predictor (the probabilities of occurrence of the distribution models or landscape variables) or multiple scale predictors (distribution models + one landscape variable). Our results indicated that distribution models alone had poor predictive abilities but were improved when landscape predictors were added; the species responses were not, however, similar to the multiple scale predictors. Our study thus highlights the importance of considering landscape metrics to generate more accurate habitat suitability models.

关键词： ecological niche model Generalized linear models Habitat suitability Landscape structure Maxent

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spawning induction and fecundity of commercial native fish species from the são Francisco River basin,Brazil,under hatchery conditions

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Agricultural sciences 2013年第8期4卷 382-388页

作者： Fábio Pereira Arantes Yoshimi sato edson Vieira sampaio elizete Rizzo Nilo Bazzoli Laboratório de Ictiohistologia Departamento de MorfologiaUniversidade Federal de Minas Gerais(UFMG)Belo HorizonteBrasil estacao de hidrobiologia e piscicultura de três marias Companhia de Desenvolvimento dos Vales do Sao Francisco e Parnaíba(CODEVASF)Três MariasBrasil Programa de Pós-Graduacao em Zoologia de Vertebrados Pontifícia Universidade Católicade Minas GeraisPUC MinasBelo HorizonteBrasil

In order to exploit native fish species for aquaculture, basic parameters of artificial reproducetion and estimates of reproductive potential for this fish must be determined to improve hatchery success. We analyze seven Brazilian commercial fish. spawning was induced using the hypophysation method, with injection of crude carp pituitary extract (CCPe). Characiformes species signaled the spawning time with behavioral alterations (usually circular movements). The time of oocyte extrusion varied from 5.3 ± 0.3 h in salminus franciscanus to 8.6 ± 0.1 h in Prochilodus argenteus after the second CCPe injection. The greatest diameter of a vitellogenic oocyte was registered for P. argenteus (873.9 ± 122.2 μm) and the smallest was for Pimelodus maculates (465.4 ± 36.3 μm). The diameter of vitellogenic oocytes was very similar among species belonging to the same family. The highest ROI values were registered for Prochilodus costatus(27.0 ± 3.5 μm) and P. argenteus (23.4 ± 3.7 μm), while the lowest values were found in Pseudoplatystoma corruscans (4.6 ± 0.9 μm) and P. maculatus (6.0 ± 1.3 μm). Absolute fecundity (number of oocytes released at spawning) was lowest in P. maculatus and highest in P. corruscans. Relative fecundity (RF) presented a high correlation (r = 0.98 to 0.99) with gonad weight, indicating high efficiency of spawning. The RF also presented a high correlation with body weight (r = 0.88 to 0.97) and total length (r = 0.86 to 0.92). The highest RF was registered for Leporinus obtusidens, and the lowest was for P. corruscans. Released fecundity had a negative correlation with the diameter of vitellogenic oocytes and with the height of the follicular cells, and a positive correlation with the thickness of the zona pelucida. These results indicate that the species studied herein are suitable candidates for aquaculture due to their reproductive and zootechnical characteristics.

关键词： spawning Induction Fecundity Oocyte Neotropical Fish sao Francisco River

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