Annette Govindarajan

Annette Govindarajan
Woods Hole Oceanographic Institution | WHOI · Department of Biology

PhD

About

40
Publications
6,825
Reads
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875
Citations
Citations since 2017
19 Research Items
421 Citations
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120

Publications

Publications (40)
Article
Full-text available
Thaliaceans are gelatinous holoplanktonic tunicates comprised of around 72 described species in three orders: the Pyrosomatida (pyrosomes), Salpida (salps) and Doliolida (doliolids). Despite their interesting biology and important role in ocean ecosystems, relatively little is known about their evolutionary relationships with other tunicate lineage...
Article
Full-text available
Determining whether a population is introduced or native to a region can be challenging due to inadequate taxonomy, the presence of cryptic lineages, and poor historical documentation. For taxa with resting stages that bloom episodically, determining origin can be especially challenging as an environmentally-triggered abrupt appearance of the taxa...
Article
Full-text available
The clinging jellyfish Gonionemus sp. is a small hydromedusa species known historically from the Swedish west coast but not reported in recent times. This species is thought to be native to the northwest Pacific where it is notorious for causing severe stings in humans and is considered invasive or cryptogenic elsewhere. This year, unlike in the pa...
Article
Full-text available
Environmental DNA (eDNA) analysis from water samples is a promising new method to identify both targeted species and whole communities of aquatic organisms. However, the current literature regarding eDNA shedding rates primarily focuses on fish and most decay rate constants are reported for warm sunlit waters. Here, we conducted experiments to inve...
Article
Full-text available
The ocean’s vast twilight, or mesopelagic, zone (200–1,000 m depth) harbors immense biomass consisting of myriad poorly known and unique animal species whose quantity and diversity are likely considerably underestimated. As they facilitate the movement of carbon from surface waters to the deep sea through feeding and migratory behaviors, ocean twil...
Article
Metabarcoding analysis of environmental DNA samples is a promising new tool for marine biodiversity and conservation. Typically, seawater samples are obtained using Niskin bottles and filtered to collect eDNA. However, standard sample volumes are small relative to the scale of the environment, conventional collection strategies are limited, and the...
Preprint
Full-text available
Metabarcoding analysis of environmental DNA samples is a promising new tool for marine biodiversity and conservation. Typically, seawater samples are obtained using Niskin bottles and filtered to collect eDNA. However, standard sample volumes are small relative to the scale of the environment, conventional collection strategies are limited, and the...
Article
Full-text available
Increasingly, researchers are using innovative methods to census marine life, including identification of environmental DNA (eDNA) left behind by organisms in the water column. However, little is understood about how eDNA is distributed in the ocean, given that organisms are mobile and that physical and biological processes can transport eDNA after...
Article
Mesobot , an autonomous underwater vehicle, addresses specific unmet needs for observing and sampling a variety of phenomena in the ocean’s midwaters. The midwater hosts a vast biomass, has a role in regulating climate, and may soon be exploited commercially, yet our scientific understanding of it is incomplete. Mesobot has the ability to survey an...
Article
The ocean's twilight zone (TZ) is a vast, globe-spanning region of the ocean. Home to myriad fishes and invertebrates, mid-water fishes alone may constitute 10 times more biomass than all current ocean wild-caught fisheries combined. Life in the TZ supports ocean food webs and plays a critical role in carbon capture and sequestration. Yet the ecolo...
Article
Full-text available
Animal biodiversity in the ocean’s vast mesopelagic zone is relatively poorly studied due to technological and logistical challenges. Environmental DNA (eDNA) analyses show great promise for efficiently characterizing biodiversity and could provide new insight into the presence of mesopelagic species, including those that are missed by traditional...
Article
Full-text available
Abstract In recent years, the cryptogenic and often highly toxic hydrozoan Gonionemus sp. has appeared in new locations around the globe and has become increasingly abundant in the Northwest Atlantic where it is now associated with severe stings. Several such stings have been documented from the island of Martha’s Vineyard, located approximately 8...
Article
Full-text available
The pelagic brown macroalga Sargassum supports rich biological communities in the tropical and subtropical Atlantic region, including a variety of epiphytic invertebrates that grow on the Sargassum itself. The thecate hydroid Aglaophenia latecarinata is commonly found growing on some, but not all, Sargassum forms. In this study, we examined the rel...
Article
Full-text available
Abundance, species diversity, and horizontal distributions of barnacle cyprids offshore of La Jolla, southern California were described from May 2014 to August 2016 to determine how the nearshore barnacle larval assemblage changed before, during, and after the 2015-16 El Niño. The entire water column was sampled at five stations located within one...
Article
A new species of a crawling limnomedusa belonging to the genus Gonionemus (Hydrozoa: Limnomedusae: Olindiidae) was collected from the brown alga Cystophora monilifera in an intertidal rock pool in Western Port, Victoria, Australia. The new species is described and compared with the three known species of Gonionemus. The mitochondrial DNA barcode ma...
Article
Full-text available
Here we report a unique trophic interaction between the cryptogenic and sometimes highly toxic hydrozoan clinging jellyfish Gonionemus sp. and the spider crab Libinia dubia. We assessed species-specific predation on the Gonionemus medusae by crabs found in eelgrass meadows in Massachusetts, USA. The native spider crab species L. dubia consumed Goni...
Data
Raw data Spreadsheet containing predation rates for each crab species at different exposure times, crab sizes (carapace widths), crab status (dead or alive) at the end of the 24-h periods, and Gonionemus field density estimates.
Article
Full-text available
A research cruise to Hannibal Bank, a seamount and an ecological hotspot in the coastal eastern tropical Pacific Ocean off Panama, explored the zonation, biodiversity, and the ecological processes that contribute to the seamount’s elevated biomass. Here we describe the spatial structure of a benthic anomuran red crab population, using submarine vid...
Data
Raw data set Columns are Along transect distance, depth, easting, northing, and crab sensity.
Data
Pleuroncodes planipes filmed from the M/V Alucias’s RV2 submarine
Data
Mass stranding events of Pleuroncodes planipes in Southern California from January to August 2015 documented by multiple media outlets
Data
Raw data. CTD profile data Temperature, Salinity and Oxygen with depth.
Article
Full-text available
We describe a possible cryptic invasion of the toxic Western Pacific hydromedusa Gonionemus vertens (Cnidaria, Hydrozoa, Limnomedusae) in the Northwest Atlantic Ocean. G. vertens was first noticed in Eel Pond in Woods Hole (Cape Cod), Massachusetts in 1894, but nearly disappeared in the 1930s, coincident with a large scale die-off of its preferred...
Article
Full-text available
The barnacle Chthamalus fragilis is found along the US Atlantic seaboard historically from the Chesapeake Bay southward, and in the Gulf of Mexico. It appeared in New England circa 1900 coincident with warming temperatures, and is now a conspicuous member of rocky intertidal communities extending through the northern shore of Cape Cod, Massachusett...
Article
Conservation groups have called for protective measures in the Sargasso Sea, a region characterized by unique planktonic seaweed communities. To better understand population connectivity and facilitate effective conservation efforts, we assessed slender Sargassum shrimp (Latreutes fucorum) 16S rDNA variation along a 3093-km transect. FST analysis a...
Article
Full-text available
Abstract A coral community 11 km southwest of the site of the Deepwater Horizon blowout at 1,370 m water depth was discovered 3.5 months after the well was capped on 3 November 2010. Gorgonian corals at the site were partially covered by a brown flocculent material (floc) that contained hydrocarbons fingerprinted to the oil spill. Here we quantify...
Article
Full-text available
Medusae and polyps of Clytia are abundantly found in coastal marine environments and one species in the genus—Clytia hemisphaerica (Linnaeus, 1767)—has become an important experimental model. Yet, only 10 species in the genus have had their life cycle investigated. Most species of Clytia are also poorly described, and detailed life cycle and morpho...
Article
Relatively little is known about the role of turbulence in a predator - prey system where the predator is a passive, pelagic forager. The Campanulariid hydroid Clytia gracilis (Cnidaria, Hydrozoa) is unusual because it occurs as planktonic colonies and is reported to forage passively in the water column on Georges Bank, Massachusetts, USA. In this...
Article
The Campanulariidae is a group of leptomedusan hydroids (Hydrozoa, Cnidaria) that exhibit a diverse array of life cycles ranging from species with a free medusa stage to those with a reduced or absent medusa stage. Perhaps the best-known member of the taxon is Obelia which is often used as a textbook model of hydrozoan life history. However, Obelia...
Article
Full-text available
The distribution and genetic structure of many marine invertebrates in the North Atlantic have been influenced by the Pleistocene glaciation, which caused local extinctions followed by recolonization in warmer periods. Mitochondrial DNA markers are typically used to reconstruct species histories. Here, two mitochondrial markers [16S rDNA and cytoch...
Article
Species-level identification is difficult in the symbiotic bivalve-inhabiting hydrozoans of the genus Eugymnanthea (Cnidaria, Hydrozoa). Morphological differences are detected only in the adult medusoid stage. Eugymnanthea is known only from the Mediterranean and the western Pacific, and doubt persists over whether the two localities are inhabited...
Thesis
The purpose of this thesis is to study campanulariid life cycle evolution and systematics. The Campanulariidae is a hydrozoan family with many life cycle variations, and provide an excellent model system to study life cycle evolution. Additionally, the unique campanulariid Obelia medusae may have been "re-invented" from ancestors without medusae. C...
Article
Full-text available
Biological invasions are an increasing agent of change in aquatic systems, and ballast-water transfer in ships is a leading pathway of these invasions. During sequential stages of ballast transfer (uptake, transport, and release), the density and diversity of the plankton assemblage is selectively filtered, determining the pool of potential invader...

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