Roberto M Venegas

Deakin University · Science, Engineering and Built Environment

Several cancer risk factors (exposure to ultraviolet-B, pollution, toxins and pathogens) have been identified for wildlife, to form a “cancer risk landscape.” However, information remains limited on how the spatiotemporal variability of these factors impacts the prevalence of cancer in wildlife. Here, we evaluated the cancer risk landscape at 49 fo...

Some researchers have suggested that corals living in deeper reefs may escape heat stress experienced by shallow corals. We evaluated the potential of deep coral reef refugia from bleaching stress by leveraging a long record of satellite-derived sea surface temperature data with a temporal, spatial, and depth precision of in situ temperature record...

The 2014–2017 Global Coral Bleaching Event is the longest, most widespread, and impactful on record. Rapid ecological assessment surveys by NOAA’s Pacific Reef Assessment and Monitoring Program reported widespread coral mortality at Jarvis Island in the aftermath of the 2015–2016 super-El Niño warming event; hard coral cover declined from 18.7% in...

We studied the high variability in wind strength and direction that characterize the northern California Current System (CCS). Local scale variability shows downwelling conditions from November to February, while the rest of the year upwelling favorable winds predominate. Anomalous wind stress conditions were present during Spring of 2000 and 2005,...

We use a multi satellite-derived data set to develop a better understanding of how local chlorophyll pigment (CHL) variability occurs along the northern CCS. We expect to provide a detailed description and quantification of annual and interannual latitudinal variability of CHL concentration, and to compare these variability with that of SST between...

The monthly seasonal climatology and interannual variability are examined in satellite-derived fields of surface chlorophyll pigment (CHL) concentration, sea surface height (SSH), sea surface temperature (SST) and wind-stress (TAU) in the northern California Current System between 1997 and 2003. The CHL concentrations in the study area show highest...

The relationship between the distribution and abundance of Pacific sardine (Sardinops sagax), northern anchovy (Engraulis mordax) and Pacific herring (Clupea pallasi) off Oregon and Washington coast during June and September of 1998 to 2002 and nearly composited satellite-derived fields of sea surface temperature (SST), chlorophyll (CHL) and sea su...

Satellite-derived Oceanographic time-series of biophysical parameters along the Gulf of Alaska shown strong trends and periodicities. To better understand their behavior and relationships we use a wavelet analysis(Morlet) to extract localized intermittent periodicities to examine relationships between time-series of Chlorophyll (SeaWiFS-CHL), Sea L...

Detect key oceanographic features known as “fronts” from satellite-derived Sea surface temperature (SST) and Chlorophyll concentration (CHL) fields, and to assess their co-occurrence. Ocean fronts are sharp boundaries occurring between water masses with different biological, chemical and physical conditions. Fronts are formed in the surface layer a...

Coincident weekly maps composites between June 2002 and September 2007 of Sea surface temperature (SST), and Chlorophyll concentration (CHL) derived from MODIS-Aqua (Moderate Resolution Imaging Spectro-radiometer) along the four major Eastern Boundary Upwelling Ecosystems (EUBE) are analyzed by using the neural network analyses based on the Self-Or...

We study the Spatial and Seasonal Variability in Sea Surface Temperature, Chlorophyll concentration, Sea Level Anomaly and Sea Surface Wind Along the Four Major Eastern Boundary Upwelling Ecosystems

The monthly seasonal climatology and interannual variability are examined in satellite-derived fields of surface chlorophyll pigment (CHL) concentration, sea surface height (SSH) and sea surface temperature (SST) in the northern California Current System between 1998 and 2003. Wind stress is examined for 2000-2003. The CHL concentrations in the stu...

Fisheries surveys over broad spatial areas are crucial in defining and delineating appropriate fisheries management areas. Yet accurate mapping and tracking of fishing activities remain largely restricted to developed countries with sufficient resources to use automated identification systems and vessel monitoring systems. For many countries, the s...

We investigated projected changes in sea surface temperature (SST) and the associated impacts on spawning habitat for skipjack tuna (Katsuwonus pelamis) in the Coral Triangle region (CT). A multimodel aggregate of SST CMIP5 models for the CT region, based on a comprehensive skill validation assessment, was used to identify the five best performing...

Coral reef and seabird communities in the central equatorial Pacific were disrupted by record-setting sea surface temperatures, linked to an anthropogenically forced trend, during the 2015/16 El Niño.

Larvae of the common intertidal chthamalid barnacles Jehlius cirratus and Notochthamalus scabrosus were obtained from mature adults collected in central and northern Chile and cultivated in the laboratory at temperatures typical of the conditions encountered by larvae in these regions. Morphological and developmental descriptions of the six nauplia...

Copyright 2008 by the American Geophysical Union Satellite-derived data provide the temporal means and seasonal and nonseasonal variability of four physical and biological parameters off Oregon and Washington (41°–48.5°N). Eight years of data (1998–2005) are available for surface chlorophyll concentrations, sea surface temperature (SST), and sea su...

The coastal oceans are important centers of carbon cycling and may significantly impact net air-sea CO2 fluxes regionally or even globally. As a result of extreme variability over a wide range of spatial and temporal scales, surface-water pCO2 levels in the coastal oceans are undersampled to the extent that even the sign of the coastal net air-sea...

We use a multi satellite-derived data set to develop a better understanding of how local chlorophyll pigment (CHL) variability occurs along the northern CCS. We expect to provide a detailed description and quantification of annual and interannual latitudinal variability of CHL concentration, and to compare these variability with that of SST between...

We studied the occurrence of large high frequency temperature fluctuations and their potential association with settlement of intertidal invertebrates during the spring/summer period 1999/2000 at Las Cruces, on the coast of central Chile. Our results showed the existence of internal tidal bores, characterized by sharp drops in water temperature at...

An inexpensive and easy to build and deploy device to measure immersion times is described. The device consists of an LCD timer mounted in a small waterproof PVC housing. Time is recorded and integrated when seawater creates a connection between two stainless steel contacts. The device was tested in the laboratory and under field conditions on a wa...

We evaluated interannual variability and the effect of the 1997-1998 El Niño event on recruitment of intertidal mussels and barnacles along the coast of central Chile in the southeast Pacific. Monthly monitoring of recruitment at 11 sites spread over 900 km (29-34°S) during the 1997-1998 El Niño and over the same months in 1998-1999 and 1999-2000 a...