Martin Thiel

Martin Thiel
Universidad Católica del Norte (Chile) · Department of Marine Biology

About

356
Publications
250,990
Reads
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20,584
Citations
Citations since 2016
123 Research Items
15206 Citations
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Publications

Publications (356)
Article
Full-text available
Non-indigenous species (NIS) can invade marine ecosystems worldwide not only because of higher growth rates and reproductive potential but also due to their ability to escape from native consumers either by defensive traits or by the colonization of spatial refuges. Spatial consumption refuges can be present in tidepools, especially in those from t...
Article
Invasive species such as seaweeds often have a broad tolerance, allowing them to colonize novel habitats. During invasion, also new epibacteria can be formed on seaweeds, which have important chemo-ecological effects. Since UV-radiation (UVR) is one of the main factors affecting seaweeds and their epibacteria, we tested its effect on intertidal and...
Article
Plastic marine debris (PMD) polluting marine habitats is a pressing anthropogenic global environmental problem and its reduction requires the commitment of government and industry, and the collaboration of the public. Environmental citizen science projects (CSPs) have flourished and are widely regarded as having positive effects on participants’ kn...
Article
Laboratory exposure studies allow to investigate the impact of microplastics on marine biota, but commonly lack a procedural control, i.e. assessing the effects of natural microparticles. In two experiments with the mussel Semimytilus algosus, we compared the effects of clay vs. polyvinyl chloride (PVC) and celite vs. polymethylmethacrylate (PMMA),...
Article
Anthropogenic litter is found in all environments, but perceptions of people about this problem depend on the context. We examined the cognition and perception of litter in the environment by schoolchildren from the Pacific Coast of Latin America. Two studies were conducted, (1) in a daily urban context, and (2) on a natural beach; schoolchildren p...
Article
Full-text available
Microplastics are ubiquitous in the marine environment and studies on their effects on benthic filter feeders at least partly revealed a negative influence. However, it is still unclear whether the effects of microplastics differ from those of natural suspended microparticles, which constitute a common stressor in many coastal environments. We pres...
Article
Many seaweed species are particularly important for passive marine dispersal, yet relatively little is known about their floating and stranding dynamics. Here, we studied these dynamics for two kelp species over four consecutive years at mid‐latitudes (30°S). Floating kelps were found during all seasons, but Macrocystis pyrifera was always more abu...
Article
Full-text available
The abundance and distribution of plastic debris at the sea surface shows considerable variability over different spatial scales. Some of the oceanographic processes at small (<1 km) and submeso (1–10 km) scales manifest themselves as slicks at the sea surface, which might have the potential to concentrate organisms and particles (such as positivel...
Technical Report
Full-text available
Marine litter, including plastics and microplastics, is accumulating in the world’s oceans at an unprecedented rate. The volume of plastics currently in the oceans has been estimated at between 75 million and 199 million tons1. Found in sea floor sediments and on beaches, among many other locations globally, plastics are are becoming part of the Ea...
Article
Rivers polluted by anthropogenic litter are major transport routes of litter from inland to the coastal zone and the ocean. However, litter studies have primarily focused on marine environments, and the litter dynamics in rivers are still poorly understood. Herein, we explored the abundances, composition and sources of litter at the riversides and...
Article
Large amounts of floating litter accumulate in the subtropical gyres, and the shorelines of oceanic islands in the vicinity of these accumulation zones receive large amounts of litter. The dynamics of marine litter arrival were evaluated on a small pocket beach on Rapa Nui (Easter Island) between November 2016 and June 2017 over a total time period...
Article
In response to the COVID-19 pandemic in 2020, Personal Protective Equipment (PPE) has been extensively used, and discarded PPE has been observed in many different environments, including on tourist beaches. Here we examined the distribution and densities of face masks on some of the main tourist beaches in Chile, and we monitored their daily accumu...
Article
Rivers are an important transport route of anthropogenic litter from inland sources toward the sea. A collaborative (i.e. citizen science) approach was used to evaluate the litter pollution of rivers in Germany: schoolchildren within the project “Plastic Pirates” investigated rivers across the entire country during the years 2016 and 2017 by survey...
Article
The emergence of citizen science has opened new possibilities for research to inform management and conservation policies. This requires a deep understanding and inclusion of diverse stakeholders. In marine environments, divers are among the largest groups of citizen science volunteers, compared to other marine users. However, little is known about...
Article
Full-text available
This study aimed to assess how oceanographic variables (depth, water temperature, and phytoplankton biomass) and the proximity to islands and seamounts affect the structure of neustonic polychaete assemblages across the SE Pacific Ocean. We used data from 2 oceanographic cruises and online databases to analyze how different environmental variables...
Book
Full-text available
En este libro descubrirás la impresionante vida marina de las Islas Oceánicas Chilenas, grandes tesoros del Océano Pacífico Sur. Conocerás su climatología y procesos oceanográficos, su gran biodiversidad, así como también sus amenazas y las acciones para su conservación. Acompaña en este viaje a un equipo de científicos nacionales e internacionales...
Article
• Characterizing the composition of divers visiting different diving areas could help to design marine citizen science (MCS) projects that support biodiversity monitoring and marine conservation. • Recreational scuba divers mostly prefer warm and clear waters with coral reefs, and based on the Duffus and Dearden’s wildlife tourism framework we hypo...
Article
The hyper-oligotrophic waters of the South Pacific Subtropical Gyre (SPSG) and the productive coastal Humboldt Current System (HCS) constitute an extreme nutrient gradient in the eastern South Pacific Ocean.Rich and dense fouling communities are known from floating objects in the HCS, but they have not been studied in the SPSG and it is not known w...
Article
Das Titelbild zeigt, wie das Einbinden von Schülerinnen und Schülern in Citizen‐Science‐Projekte eine Vielzahl an Kompetenzen fördert. Abbildung aus Kruse et al. 2020 (Dem Plastikmüll auf der Spur – Ein internationales Citizen‐Science‐Projekt zur Förderung der naturwissenschaftlichen Grundbildung von Schülerinnen und Schülern, Chemkon, DOI: 10.1002...
Article
Full-text available
The global distribution of primary production and consumption by humans (fisheries) is well-documented, but we have no map linking the central ecological process of consumption within food webs to temperature and other ecological drivers. Using standardized assays that span 105° of latitude on four continents, we show that rates of bait consumption...
Book
Full-text available
This is the seventh volume of a ten-volume series on The Natural History of the Crustacea. Our volume examines Developmental Biology and Larval Ecology, and it follows Volume 1: Functional Morphology and Diversity, Volume 2: Life Styles and Feeding Biology, Volume 3: Nervous Systems and Control of Behavior, Volume 4: Physiology, Volume 5: Life Hist...
Article
Full-text available
1. While floating near the sea surface plastic debris interacts with a number of external factors, including many different organisms. Seabirds have the most extensive documented history of interactions with plastics, through ingestion, entanglement, and nest construction. 2. In the present study, eight seabird species from the South Pacific Ocean...
Article
-Marine plastic pollution is worse than expected, and we are starting to realize its full extent and severity. Solving the plastic pollution problem is not easy, as it requires the action and commitment of all sectors of our society. With a coastline extending over 4,000 km (from 18°S to 56°S), Chile is a maritime country, and since plastics are po...
Article
Abstract Aim: Topographic complexity is widely accepted as a key driver of biodiversity, but at the patch-scale, complexity–biodiversity relationships may vary spatially and temporally according to the environmental stressors complexity mitigates, and the species richness and identity of potential colonists. Using a manipulative experiment, we asse...
Chapter
Full-text available
Reproductive rhythms can be found in numerous crustacean species. This chapter reviews the temporal scales of rhythms and how these rhythms are entrained and maintained by external cues and endogenous clocks. The occurrence and synchrony of rhythms vary along latitudinal and depth gradients, which may depend on the availability of zeitgebers (e.g.,...
Chapter
Citizen science projects help schoolchildren gain insights into topics of current scientific research and the research process itself. This creates an opportunity to provide students with the skills needed to become critically-thinking engaged citizens. Despite highly positive motivation and feedback during many citizen science projects, research i...
Article
UV radiation can affect the physiology of seaweeds and their associated microorganisms. In this study we exposed different Chilean populations of the agarophyte Gelidium lingulatum to PAR or PAR+UV and monitored their photosynthetic performance using in vivo chlorophyll fluorescence for 5 days to determine changes in abundance and composition of ep...
Article
Full-text available
Large herbivores such as sea urchins and fish consume a high proportion of benthic primary production and frequently control the biomass of marine macrophytes. By contrast, small mesograzers, including gastropods and peracarid crustaceans, are abundant on seaweeds but have low per capita feeding rates and their impacts on marine macrophytes are dif...
Technical Report
Full-text available
El Proyecto STRONG High Seas forma parte de la Iniciativa Internacional sobre el Clima (IKI); www. international-climate-initiative.com/en/). El Ministerio Federal de Medio Ambiente, Protección de la Naturaleza y Seguridad Nuclear (BMU) fomenta esta iniciativa en virtud de una resolución del Parlamento de la República Federal de Alemania. El Proyec...
Article
Full-text available
Southeast Pacific (SEP) oceanic islands are characterized by their extreme isolation and high degree of endemism. To date, most research has focussed on species composition and distributions, with little information available on early life stages. In this study, we provide new records of early life stages of cephalopods based on planktonic collecti...
Article
Geographic variation of phenotypic traits affects the capacity of species to withstand and adapt to environmental stress. Here, we examined how geographic origin influences UV‐stress tolerance of the red seaweeds Chondracanthus chamissoi and Gelidium lingulatum distributed along the South‐East Pacific coast between 20° S and 42° S. Seaweeds from 6...
Chapter
Many crustacean species are known to provide parental care, with behaviors ranging from ventilating the eggs to providing food for young. This chapter provides an overview of parental care patterns across crustaceans, and then compares crustacean parental care to that of select other taxa (insects, fishes, frogs) that share important traits with cr...
Article
de In dem Citizen‐Science‐Projekt „Dem Plastikmüll auf der Spur“ wurden Schülerinnen und Schüler gemeinsam mit ihren Lehrkräften in eine wissenschaftliche Untersuchung zur Erhebung von Mülldaten an deutschen und chilenischen Stränden eingebunden. Durch das Projekt wurden zum einen wissenschaftliche Daten erhoben, zum anderen wurde bei den Teilnehme...
Poster
Full-text available
In northern-central Chile, natural variability in ocean temperature is driven by the El Nino Southern Oscillation (ENSO). The frequency and intensity of ENSO events and resulting heat waves may increase in future due to anthropogenic climate change. Kelps are important primary producers in coastal temperate ecosystems. They serve as a food source f...
Article
Full-text available
Subtropical gyres are the oceanic regions where plastic litter accumulates over long timescales, exposing surrounding oceanic islands to plastic contamination, with potentially severe consequences on marine life. Islands’ exposure to such contaminants, littered over long distances in marine or terrestrial habitats, is due to the ocean currents that...
Article
Full-text available
Background: There is a biogeographic break located at 30°S in the southeast Pacific, in a coastal area of strong environmental discontinuities. Several marine benthic taxa with restricted dispersal have a coincident phylogeographic break at 30°S, indicating that genetic structure is moulded by life history traits that limit gene flow and thereby p...
Article
Full-text available
Consumer pressure in benthic communities is predicted to be higher at low than at high latitudes, but support for this pattern has been ambiguous, especially for herbivory. To understand large-scale variation in biotic interactions, we quantify consumption (predation and herbivory) along 2500 km of the Chilean coast (19°S–42°S). We deployed tetheri...
Chapter
Full-text available
Wastewater effluent is a prevalent source of contaminants of emerging concern in aquatic environments, including plastic pollution. A wide range of monitoring and analytical techniques to assess the contribution of wastewater derived microplastic pollution have been employed over the past two decades. The goal of this report is to critically evalua...
Article
We determined the spatial and seasonal distribution of Floating Marine Debris (FMD) by visual ship surveys across the northern Baltic Sea between Finland and Sweden. FMD density was comparatively low, and we found the highest debris density close to major port cities. The seasonal variation in debris density was not pronounced although we observed...
Article
Squat lobsters frequently inhabit low-oxygen waters, facing particular physiological challenges. Pleuroncodes monodon inhabits one of the most extreme oxygen minimum zones in the world’s oceans at low temperatures, but avoids high temperature hypoxic waters. The present study aimed to determine whether the maternally dependent reproductive outcome...
Article
Full-text available
Squat lobsters frequently inhabit low-oxygen waters, facing particular physiological challenges. Pleuroncodes monodon inhabits one of the most extreme oxygen minimum zones in the world’s oceans at low temperatures, but avoids high temperature hypoxic waters. The present study aimed to determine whether the maternally dependent reproductive outcome...
Article
Full-text available
Operational sex ratio (OSR) has long been considered an important predictor of sexual selection strength. In crustaceans, OSR is primarily dependent upon reproductive rhythms. Herein, we model different conditions of reproductive rhythms to investigate the potential link between OSR and the strength of sexual selection, focusing on sexual traits co...
Article
Full-text available
Kelp forests are declining in many parts of the globe, which can lead to the spreading of barren grounds. Increased abundances of grazers, mainly due to reduction of their predators, are among the causes of this development. Here, we compared the species richness (SR), frequency of occurrence (FO), and maximum abundance (MaxN) of predatory fish and...
Article
Full-text available
Availability of floating seaweeds may depend on the seasonal cycles of benthic populations, but our ability to predict temporal patterns of stranded biomasses is still limited. Season-dependent, local storms favor detachment of seaweeds from the substratum, which can be reflected in the stranded biomasses on adjacent beaches after these events. Hen...
Poster
Full-text available
La ciencia ciudadana involucra la sociedad civil en la investigación científica. Este tipo de iniciativas genera mejores resultados al establecer la propiedad conjunta del conocimiento. Además, es de particular utilidad en zonas remotas, donde los científicos enfrenta una serie de problemas logísticos para desarrollar la investigación. En Rapa Nui,...
Article
Full-text available
Divers have widely participated in citizen science (CS) projects and are one of the main groups of marine citizen scientists. However, there is little knowledge about profiles of, and incentives for potential divers to join CS projects. To date, most studies have focused on the SCUBA diving industry; nevertheless, there is a diversity of divers, no...
Article
Full-text available
Many marine gastropods show species-specific behavioral responses to different predators, but less is known about the mechanisms influencing differences or similarities in specific responses. Herein, we examined whether two limpet species, Scurria viridula (Lamarck, 1819) and Fissurella latimarginata (Sowerby, 1835), show species- and size-specific...
Technical Report
Full-text available
This report was the product of a GESAMP Working Group, consisting of 15 independent experts based in North America, South America, Asia, Africa, Europe and Australasia. The report was edited by Kershaw, Turra and Galgani. It with provides recommendations to encourage a more harmonised approach to the monitoring and assessment of plastic litter, inc...
Article
Full-text available
Diverse phenotypic characteristics have evolved in seaweeds to cope with environmental stress, but these traits can vary among populations of the same species especially if these are distributed along environmental gradients. In this study, natural populations of the carrageenophyte Chondracanthus chamissoi and the agarophyte Gelidium lingulatum fr...
Book
Full-text available
A field guide for the identification of rafting biota along the South American Pacific coasts.