New paper: Insights into the assembly rules of a continent-wide multilayer network

How are ecological systems assembled? Identifying common structural patterns within complex networks of interacting species has been a major challenge in ecology, but past research has focused primarily on single interaction types aggregated in space or time. In this new study, our team shed light on the assembly rules of a multilayer network of frugivory and nectarivory interactions between bats and plants in the Neotropics. We described a massive network whose parts differ from the whole, or a compound structure that appears to be assembled by different processes –from evolutionary constraints to functional morphology– at various scales. You can read more about these exciting findings in our paper here, and a wonderful “behind the scenes” summary here.

The hierarchical assembly of a continent-wide, multilayer network of bats and plants (credit: Marco Mello).

Congratulations Dr. Stanchak!

Katie Stanchak successfully defended her Dissertation this past October! Katie’s research focused on the anatomical diversification and function of a skeletal novelty found in bat feet, the calcar. She conducted unprecedented comparative analyses of the calcar and associated structures across major bat groups, and experimental assays to better understand the function and developmental origin of the calcar. We are so proud of all she accomplished during her PhD, and excited about her postdoc plans to continue studying morphological and functional diversity in other vertebrate groups!

Congratulations to Dr. Kelly and Dr. Leiser-Miller!

Congratulations to the newly minted PhDs from the lab, Rochelle Kelly and Leith Leiser-Miller!! Both of them did a terrific job defending their dissertations last week. Rochelle’s research revealed geographic and ecological factors that affect the diversity, distribution, and activity of bats in the San Juan archipelago. Leith’s dissertation led to exciting discoveries about the acoustic diversity and sensory ecomorphology of phyllostomid bats . We are so proud of all the work they were able to accomplish!

Summer awards!

Congratulations to lab members receiving awards and grants this summer!

Katie Stanchak was awarded the American Society of Mammalogists’ Anna M. Jackson Award, which carries the honor of presenting her paper at the opening Plenary Session of the ASM meeting this year.

David Villalobos was awarded a Theodore Roosevelt Memorial Fund grant from the American Museum of Natural History to conduct field research on cricetid rodents in Costa Rica this summer.

PI Santana was awarded a Fulbright Scholars fellowship to expand upon her work on the coevolution between pepper plants and short-tailed fruit bats in Costa Rica, where she will be spending part of her sabbatical next year.

New paper!! Adaptive shifts in skull shape evolution in bats

An image of two bat skulls.
Skulls of a common blossom bat, Syconycteris australis (left) and a grey-headed flying fox, Pteropus poliocephalus(right).Dennis Wise/University of Washington

In a new and exciting paper in Nature Communications, we present the results of phylogenetic comparative analyses across hundreds of bat species, and demonstrate how two major forces –echolocation and diet– shaped the diversity of bat skulls over their evolutionary history. Check out this press release highlighting the main results of the paper, and the methods we used!

We’re moving – twice!

We are currently moving the Burke Museum’s ~55,000 mammal specimens to the New Burke, which will open in Fall 2019. The mammal collection is currently closed for operations, as we joyfully transport our specimens to this brand-new facility in the UW Seattle campus:

Our lab has also moved to the Life Sciences Building, a beautiful new facility designed to enhance collaboration across the UW Biology Department, and active-learning teaching efforts.

New paper on the hindlimb membrane musculature of bats

Virtual dissections in ventral view of the calcar-depressor muscle complex of one hindlimb of (a) Myotis californicus, (b) Molossus molossus, and (c) Artibeus jamaicensis.

Ph.D. student Katie Stanchak just published a new paper describing  the variation in the membrane and limb musculature associated with the calcar – a neomorphic skeletal structure found in the hind limbs of most bats. By combining diffusible iodine-based contrast enhanced computed tomography (diceCT) and standard histological techniques, Katie found that the arrangement of the calcar musculature varies among bat species that have different flight ecologies. These results suggest that the calcar may have a functional role in flight maneuverability, an idea that Katie will be testing in later stages of her Dissertation.

Katie’s article has also been featured in the diceCT blog.

More papers! Behavioral correlates of cranial muscle functional morphology

Check out the new issue of the Anatomical Record, co-edited with Adam Hartstone-Rose and Damiano Marchi! It is full of anatomical goodness, and showcases new findings and cutting-edge techniques in the study of muscle functional morphology. This issue contains several papers by Santana lab members:

Curtis A.A. and Santana S.E. 2018. Jaw-dropping: functional variation in the digastric muscle in bats. The Anatomical Record 301: 279–290. PDF

Santana S.E. 2018. Comparative anatomy of bat jaw musculature via Diffusible Iodine-Based Contrast-Enhanced Computed Tomography. The Anatomical Record 301: 267–278. PDF

Hartstone-Rose and Santana S.E. 2018. Behavioral correlates of cranial muscle functional morphology. The Anatomical Record 301: 197–201. PDF

Arbour J.A. and López-Fernández H. 2018. Intrinsic Constraints on the Diversification of Neotropical Cichlid Adductor Mandibulae Size. The Anatomical Record 301: 216–226.

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New paper: Auditory opportunity and visual constraint enabled the evolution of echolocation in bats

Why are there bats that do not echolocate, and how has body size and morphology constrained or facilitated the evolution of sensory diversity in bats? In a collaborative paper in Nature Communications, we present a broad phylogenetic comparative analysis that illuminates the trade-offs between vision and echolocation during bat evolution. You can access the open-access paper here. Enjoy!

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The evolution of anterior coloration in carnivorans

Why does the spectacled bear have facial stripes? Or why do canids have relatively plain faces? In a new article with the Caro and Stankowich labs, we explored the behavioral factors that might predict the diversity in facial and chest colors in carnivorans. Much to our surprise, we found that there might be different factors associated with the evolution facial and chest coloration in different lineages. Find out more by reading  the full article in Behavioral Ecology and Sociobiology, or its press coverage from Science.

Caro et al. 2017
Caro et al. 2017