Results 111 to 120 of about 4,791,023 (247)

Isoperimetric Regions in Nonpositively Curved Manifolds [PDF]

arXiv, 2016
Isoperimetric regions minimize the size of their boundaries among all regions with the same volume. In Euclidean and Hyperbolic space, isoperimetric regions are round balls. We show that isoperimetric regions in two and three-dimensional nonpositively curved manifolds are not necessarily balls, and need not even be connected.
arxiv  

Dryinidae of the Neotropical region (Hymenoptera: Chrysidoidea).

Zootaxa, 2014
An updated revision of Neotropical Dryinidae is presented. Seven subfamilies, 23 genera and 502 species are treated. Descriptions, geographic distribution, known hosts, natural enemies and type material of each species are presented, together with ...
M. Olmi, E. Virla
semanticscholar   +1 more source

An ecological vulnerability index to assess impacts of offshore wind facilities on migratory songbirds

Journal of Applied Ecology, EarlyView.
Our methodology is readily applicable to other regions where offshore wind (OSW) development is planned and songbird migration is common, allowing research and monitoring activities to be targeted to species most likely to be negatively affected by OSW facility encounters. Abstract As offshore wind (OSW) energy expands globally, migratory songbirds are
Leon A. Green‐Tkacenko, Michael C. Allen, Julie L. Lockwood   +2 more
wiley   +1 more source

Rates of pulmonary infection by pentastomids in lizards species from a restinga habitat in northeastern Brazil

Brazilian Journal of Biology
Pulmonary parasitism by pentastomids was examined in two lizard species inhabiting an area of restinga vegetation (coastal sand dunes) situated in the municipality of Mataraca (6° 29' S and 34° 56' W), on the extreme northern coast of Paraíba State ...
WO. Almeida, GG. Santana, WLS. Vieira, IC. Wanderley, SC. Ribeiro   +4 more
doaj   +1 more source

Type material of Collembola (Hexapoda) housed at the Entomological Collection of the Museo de La Plata, Buenos Aires, Argentina

Revista del Museo de La Plata, 2017
Springtails are entognathous hexapodous (0.2?10 mm) that inhabit in both, aquatic and terrestrial environments. Eighty one type species of Collembola housed at La Plata Museum (Entomology Division) in Argentina were examined and listed.
Ana Ernestina Salazar-Martínez, María José Narvaez-Beinhorn, Verónica Bernava-Laborde   +2 more
doaj   +1 more source

Inteligencia Artificial para la conservación y uso sostenible de la biodiversidad, una visión desde Colombia (Artificial Intelligence for conservation and sustainable use of biodiversity, a view from Colombia) [PDF]

arXiv
The rise of artificial intelligence (AI) and the aggravating biodiversity crisis have resulted in a research area where AI-based computational methods are being developed to act as allies in conservation, and the sustainable use and management of natural resources.
arxiv  

Conceptualization of seeded region growing by pixels aggregation. Part 2: how to localize a final partition invariant about the seeded region initialisation order [PDF]

arXiv, 2008
In the previous paper, we have conceptualized the localization and the organization of seeded region growing by pixels aggregation (SRGPA) but we do not give the issue when there is a collision between two distinct regions during the growing process. In this paper, we propose two implementations to manage two classical growing processes: one without a ...
arxiv  

Neotropical region: a shapefile of Morrone's (2014) biogeographical regionalisation.

Zootaxa, 2014
In biogeography, spatial comparisons provide a quantitative assessment of the overlap between taxic distributions and areas. This information is used to describe taxonomic geographic distributions employed in further analyses.
Peter Löwenberg‐Neto
semanticscholar   +1 more source

Interspecific and intraspecific variations in root phosphatase activity among tropical tree species with different soil phosphorus associations

Journal of Ecology, EarlyView.
Our results suggest that the specialization of tropical tree species to low‐P soil involves investment in the acquisition of complex soil organic phosphates such as phosphodiesters and phytic acid. This is possibly related to root trait divergence and indicates that variation in P acquisition strategies among tropical tree species could contribute to ...
Ryota Aoyagi, Riona Kobayashi, Benjamin L. Turner   +2 more
wiley   +1 more source

A revised key to the Neotropical cleptoparasitic anthidiine genera (Hymenoptera, Megachilinae) with notes and description of the male of Rhynostelis Moure & Urban

ZooKeys, 2012
Rhynostelis Moure & Urban is a monotypic cleptoparasitic neotropical anthidiine genus currently known from two females. Herein, we describe and illustrate for the first time the male and its genitalia and it is confirmed that Rhynostelis parasitizes ...
Danuncia Urban, Daniele Parizotto
doaj   +1 more source