Alluvial shell beds along Kucharo Lake, Hokkaido

Advanced Topics in Sediment Transport Modelling: Non-alluvial Beds and Hyperconcentrated Flows

ارتباط افق‌های پرفسیل( shell beds ) و اثرفسیل‌های آلبین-سنومانین سازند آیتامیر در تاقدیس امیرآباد – شمال‌شرق مشهد

  سازند آیتامیر(آلبین-سنومانین) در حوضه رسوبی کپه‌داغ دارای اثرفسیل‌های گوناگون و چندین افق پرفسیل است. این اثرفسیل‌ها حاوی الگوهای رفتارشناسی متنوع شامل پناهگاهی، تغذیه‌ای، گریزینگ، تعادلی، پیچ و تاب خورده، هم‌زیست شیمیایی و فراری هستند. انواع افق‌های پرفسیل را می‌توان بر اساس تفاوت در خصوصیات رسوب‌شناسی، پالئواکولوژیکی و تافونومیکی تشخیص داد. افق‌های پرفسیل و ماسه­سنگ­های حاوی آثارفسیلی در س...

Predictors of shell size in long‐lived lake gastropods

AIM To investigate shell size variation among gastropod faunas of fossil and recent long-lived European lakes and discuss potential underlying processes. LOCATION Twenty-three long-lived lakes of the Miocene to Recent of Europe. METHODS Based on a dataset of 1412 species of both fossil and extant lacustrine gastropods, we assessed differences in shell size in terms of characteristics of the...

Lake Malawi cichlid evolution along a benthic/limnetic axis

Divergence along a benthic to limnetic habitat axis is ubiquitous in aquatic systems. However, this type of habitat divergence has largely been examined in low diversity, high latitude lake systems. In this study, we examined the importance of benthic and limnetic divergence within the incredibly species-rich radiation of Lake Malawi cichlid fishes. Using novel phylogenetic reconstructions, we ...

Crater lake cichlids individually specialize along the benthic–limnetic axis

A common pattern of adaptive diversification in freshwater fishes is the repeated evolution of elongated open water (limnetic) species and high-bodied shore (benthic) species from generalist ancestors. Studies on phenotype-diet correlations have suggested that population-wide individual specialization occurs at an early evolutionary and ecological stage of divergence and niche partitioning. Thi...