Ticks are vectors of pathogens affecting human and animal health worldwide. Nevertheless, the ecological and evolutionary interactions between ticks, hosts, and pathogens are largely unknown. Here, we integrated a framework to evaluate the associations of the tick Ixodes ricinus with its hosts and environmental niches that impact pathogen circulation. The analysis of tick-hosts association sugg...

Analyses of mitochondrial control region polymorphisms have supported the presence of several demographically independent green turtle (Chelonia mydas) rookeries in the Greater Caribbean region. However, extensive sharing of common haplotypes based on 490-bp control region sequences confounds assessment of the scale of natal homing and population structure among regional rookeries. We screened ...

Nonbreeding shorebirds often alternate social structure between anonymous flocks and territorial behavior in response to different environmental factors. To evaluate specific drivers for one species, we studied the spacing behavior of wintering Western Sandpipers (Calidris mauri) at Bahı́a Santa Maŕıa, northwestern Mexico, using behavioral observations. The density, population structure, and ter...

reprintinfo.asp. doi: 10.1525/cond.2010.100146 Resumen. las poblaciones de Euphagus carolinus han disminuido dramáticamente en toda su distribución en américa del norte al menos desde la década de los sesenta, pero las causas de esta disminución se desconocen. Medimos los cocientes de isótopos estables de hidrógeno (δd) en plumas recolectadas entre 2005 y 2009 en el valle aluvial del Mississipp...

Resumen.—La morfología de la cola de muchas aves ha sido moldeada tanto por selección natural como por selección sexual. Algunos modelos de la aerodinámica de la cola predicen que las funciones relacionadas con el vuelo implican una presión de selección natural para tener colas con formas moderadamente ahorquilladas, lo que limitaría la tendencia de la selección sexual a generar diversidad morf...

Analysis of the gene cluster from Streptomyces avermitilis that governs the biosynthesis of the polyketide anthelmintic avermectin revealed that it contains four large ORFs encoding giant multifunctional polypeptides of the avermectin polyketide synthase (AVES 1, AVES 2, AVES 3, and AVES 4). These clustered polyketide synthase genes responsible for avermectin biosynthesis together encode 12 hom...

Address for Correspondence/Yaz›şma Adresi: Dr. Erdal Aktürk, Adıyaman Üniversitesi Tıp Fakültesi, Kardiyoloji Anabilim Dalı, Adıyaman-Türkiye Phone: +90 416 223 16 90 E-mail: [email protected] Accepted Date/Kabul Tarihi: 26.03.2012 Available Online Date/Çevrimiçi Yayın Tarihi: 15.06.2012 ©Telif Hakk› 2012 AVES Yay›nc›l›k Ltd. Şti. Makale metnine www.anakarder.com web sayfas›ndan ulaş›labi...

The rapid growth of the Internet has made IPv4 addresses a scarce resource. Today we witness two major trends to get around this problem. The first is to upgrade and deploy networks using IPv6; the second is to deploy networks using reusable-IPv4 addresses. As a result, the Internet is rapidly evolving into a collection of networks of heterogeneous address spaces. Such development jeopardizes t...

Little is known about how insectivorous bird diets are influenced by arthropod availability and about how these relationships vary seasonally. We captured birds in forest-canopy gaps and adjacent mature forest during 2001 and 2002 at the Savannah River Site in Barnwell County, South Carolina, and flushed their crops to gather information about arthropods eaten during four periods: spring migrat...

Resumen.—La tasa de acumulación de recursos energéticos por parte de las aves que se encuentran en migración puede indicar la calidad del hábitat en los sitios de paradas migratorias. Sin embargo, se sabe poco sobre acerca de cómo los hábitos de alimentación y la disponibilidad de alimentos afectan el metabolismo de las grasas y proteínas de aves silvestres en los sitios de parada. Comparamos i...