Gema Hernan

Gema Hernan
Mediterranean Institute for Advanced Studies (IMEDEA) | IMEDEA · Department of Ecology and Marine Resources

PhD. in Marine Ecology
Postdoctoral Fellow at the Mediterranean Institute for Advanced Studies working on coastal systems.

About

18
Publications
3,825
Reads
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183
Citations
Introduction
My research interest is to understand how environmental factors or ecological state changes affect the processes and mechanisms of coastal systems at different levels, from individuals to communities, and at different spatial and temporal scales. My research is motivated by dual goals of advancing ecological knowledge and influencing management decisions. I take an integrative perspective in physiology and ecology combining observational and experimental approaches, and modelling tools.
Additional affiliations
October 2018 - present
Florida State University
Position
  • PostDoc Position
January 2013 - October 2017
Mediterranean Institute for Advanced Studies (IMEDEA)
Position
  • PhD Student
Education
December 2012 - December 2016
University of the Balearic Islands
Field of study
  • Marine Ecology
October 2010 - October 2011
University of Barcelona
Field of study
  • Marine Sciences
September 2002 - June 2008

Publications

Publications (18)
Article
Full-text available
The introduction and successful expansion of tropical species into temperate systems is being exacerbated by climate change, and it is particularly important to identify the impacts that those species may have, especially when habitat-forming species are involved. Seagrass meadows are key shallow coastal habitats that provide critical ecosystem ser...
Article
Differences in phenolic composition across different ontogenic stages can be crucial in determining the interaction outcomes between plants and their surrounding biotic environment. In seagrasses, specific phenolic compounds have rarely been analyzed and remain unexplored in ontogenic stages other than non-reproductive adults. Furthermore, it is ge...
Article
Full-text available
Aim Seagrass beds are declining globally and are increasingly vulnerable to sea level rise (SLR), which could have consequences for the rich biodiversity they support. Spatial variation in the role of seagrass beds in enhancing biodiversity is poorly resolved, limiting our ability to set priorities for conservation and restoration. We aimed to mode...
Article
This study documents the first validation of the suitability of the most common parameters and protocols used in marine ecophysiology to characterise photosynthesis by means of chlorophyll a fluorescence tools. We demonstrate that the effective yield of PSII (ΔF/Fm') is significantly underestimated when using short inductions times (≤1 min) followi...
Article
Aim Studies on latitudinal patterns in plant defence have traditionally overlooked the potential effect that resource availability may have in shaping plant defence. Likewise, latitudinal patterns of tolerance traits have rarely been studied, yet they can be a critical component of plant defence. Therefore, the aim of our study was to examine latit...
Article
Seagrasses are key habitat-forming species of coastal areas. While previous research has demonstrated considerable small-scale variation in seagrass abundance and structure, studies teasing apart local from large-scale variation are scarce. We determined how different biogeographic scenarios, under varying environmental and genetic variation, expla...
Article
Full-text available
Fish abundance and diversity are core measurements taken by many nearshore marine monitoring projects. The most common approaches for counting fish include belt transects and timed counts by roving divers, each with its own limitations. Here we evaluate a fish counting method developed by the Channel Islands National Park’s Kelp Forest Monitoring P...
Article
Full-text available
Coastal and marine ecosystems characterized by foundation species, such as seagrass beds, coral reefs, salt marshes, oyster reefs, and mangrove forests, are rich in biodiversity and support a range of ecosystem services including coastal protection, food provisioning, water filtration, carbon sequestration, recreational opportunities, cultural valu...
Article
Seagrasses are key habitat-forming species of coastal areas. While previous research has demonstrated considerable small-scale variation in seagrass abundance and structure, studies teasing apart local from large-scale variation are scarce. We determined how different biogeographic scenarios, under varying environmental and genetic variation, expla...
Article
Full-text available
Numerous hypotheses have been posited to explain the observed variation in plant defense strategies against herbivory. Under resource-rich environments, plants are predicted to increase their tolerance (limiting resource model; LRM) and, while the resource availability hypothesis (RAH) predicts a decrease in constitutive resistance in plant species...
Article
Persistent organic pollutants (POPs) reach Antarctica through atmospheric transport, oceanic currents, and to minor extent, by migratory animals. The Southern Ocean is a net sink for many POPs, with a key contribution of the settling fluxes of POPs bound to organic matter (biological pump). However, little is known about POP transfer through the fo...
Article
Increases in seawater temperature are expected to have negative consequences for marine organisms. Beyond individual effects, species-specific differences in thermal tolerance are predicted to modify species interactions and increase the strength of top-down effects, particularly in plant-herbivore interactions. Shifts in trophic interactions will...
Article
Full-text available
Under future increased CO2 concentrations, seagrasses are predicted to perform better as a result of increased photosynthesis, but the effects in carbon balance and growth are unclear and remain unexplored for early life stages such as seedlings, which allow plant dispersal and provide the potential for adaptation under changing environmental condi...
Article
Coastal communities are under threat from many and often co-occurring local (e.g. pollution, eutrophication) and global stressors (e.g. climate change), yet understanding the interactive and cumulative impacts of multiple stressors in ecosystem function is far from being accomplished. Ecological redundancy may be key for ecosystem resilience, but t...
Article
The remote oceans are among the most pristine environments in the world, away from sources of anthropogenic persistent organic pollutants (POP), but nevertheless recipient of atmospheric deposition of POPs that have undergone long range atmospheric transport (LRAT). In this work, the background occurrence of gas and aerosol phase polychlorinated di...

Projects

Project (1)
Project
Identifying the main defense strategies in seagrasses and what factors determine their variations in seagrasses. We will evaluate the effects of changes in environmental factors (tempreature, nutrient availability, C availability) and herbivore pressure in tolerance, resistance and induction of seagrass defenses against herbivory.