Congratulations to Rachel Kinney on acceptance to Bren's MESM program!

posted Aug 5, 2017, 9:43 PM by Stephen Gosnell

Rachel will be joining the Master's in Environmental Science and Management program this fall as part of the Bren School at the University of California, Santa Barbara.  Congratulations!

Summer 2017 Updates

posted Aug 4, 2017, 7:39 AM by Stephen Gosnell   [ updated Sep 7, 2017, 1:36 PM ]

This summer we've been collaborating with the River Project​ and Billion Oyster Project on a study focused on how the presence of predators impacts biodeposition in oysters. Oysters feed by filtering plankton from the water, which is important to improving water quality. Biodeposition also connects pelagic (water) and benthic (sediment) systems as oysters produce biodeposits (poop, to put it scientifically). These biodeposits may act as fertilizer and increase the rates at which sediment microbes contribute to denitrification, or the removal of available nitrogen to the air. Denitrification is an important ecosystem service provided by coastal habitats, as excess nitrogen in aquatic systems can lead to algal blooms and resulting low oxygen conditions that can harm other living things. This is especially true in NY due to the high amounts of nitrogen our waters. 

We know from past studies that oysters grow less when they are near predators, so we assume predators impact their feeding. Changes in oyster feeding could include how much they filter from the water or how they use what they filter, and either of these changes mig
ht impact biodeposition quantity and quality and eventually influence denitrification rates. This summer we're exploring this issue by seeing how previous exposure to predators (oyster drills) interacts with immediate exposure to the predators to influence biodeposition by oysters. Preliminary results indicate oysters biodeposit more in the presence of predators. We plan to continue this work to quantify impacts of predators on oyster filtration rates and denitrification in adjacent sediments to better understand how these species interactions might influence ecosystem services.

Preliminary analysis indicates that predator presence and previous exposure to predators both increase biodepostion rates.

New paper on NCE in oysters accepted to MEPS

posted Feb 1, 2017, 5:40 AM by Stephen Gosnell

Our new paper on how non-consumptive effects are impacted by predator biomass and might impact oyster aquaculture has been accepted to MEPS! You can view the abstract and eventual pre-press article here.  Using standard aquaculture techniques, we showed that oysters respond more strongly to changes in predator number than predator size. These effects can slow growth upwards of 10% in caged oysters, which are often thought of as "protected" from predators.

Early view available for oyster habitat paper

posted Jun 1, 2016, 7:28 AM by Stephen Gosnell

Erica Levine's paper on how cultch type may influence oyster restoration efforts has been accepted by Restoration Ecology and is available via early view.

ratlantis moved to new r4atlantis organization on github

posted Dec 11, 2015, 12:48 AM by Stephen Gosnell

The home for the ratlantis package has been moved to the new r4atlantis organization on github.  Maintaining it on the r4atlantis page should aid in keeping a single copy for the code, wiki, and issues, and also help everyone find the new group and all the R-related Atlantis code on it.  I'll still be maintaining and developing the package, and now you can join the r4atlantis organization and ratlantis team if you want to contribute.   

ratlantis repository is up (and passing) on Github

posted May 19, 2015, 11:58 AM by Stephen Gosnell

ratlantis is a new R package I'm developing to allow Atlantis ecosystem models to be more quickly constructed and analyzed.  A development version of the package can now be found on Github.  A function for constructing bgm maps is already up, and the rest will be populated over the summer.  

Student researchers present their work at Creative Inquiry Day

posted May 19, 2015, 11:56 AM by Stephen Gosnell   [ updated May 19, 2015, 11:59 AM ]

Two students working on independent study projects in the lab shared posters at Baruch's recent Creative Inquiry Day.  Ana Dias showcased her work developing a phylogenetic tree for the TEAM tropical forest data using open-source tools and comparing the predictive ability of phylogenetic measures to functional and taxonomic diversity.  Carolina Ferreira presented data from an on-going metaanalysis considering how much managers time and efforts managers should spend in rebuilding genetic diversity.  More details here

and here

The other impacts of keystone predators: New paper out in Oikos

posted Apr 13, 2015, 8:38 PM by Stephen Gosnell   [ updated Apr 13, 2015, 8:39 PM ]

New paper out in Oikos asks how keystone predators may actually facilitate invasions. Early view available @ http://onlinelibrary.wiley.com/doi/10.1111/oik.01865/abstract.

Conservation Biology class saves seeds for restoration in the city

posted Feb 23, 2015, 5:38 PM by Stephen Gosnell

The recent outing our conservation biology took to Hunter's Point South Park was mentioned in the Baruch Alumni Magazine.

rglobi released on CRAN!

posted Feb 2, 2015, 7:08 PM by Stephen Gosnell   [ updated Feb 2, 2015, 7:08 PM ]

rglobi, the R package for accessing the Global Biotic Interactions database, is now available via CRAN. I'll be talking about the package at the upcoming Gulf of Mexico Oil Spill and Ecosystem Science Conference.


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