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Araçá Bay RSS

Sponge
Sponge

Sponge

Author: Alvaro E. Migotto
Taxa: Porifera
Size: 10 - 100 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, cebimar-usp, rocky-shore
Egret bird
Egret bird

Egret bird

Author: Alvaro E. Migotto
Taxa: Ardeidae
Size: >100 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: mangrove, sand beach
Snail
Snail
Littoraria flava often occurs on rocky shores close to estuaries and mangroves. It is an ovoviviparous species, ant its life cycle includes a planktonic larval stage and a sedentary adult stage. In the Bay Araçá it usually forms large aggregates on rocks and mangrove roots.

Snail

Littoraria flava often occurs on rocky shores close to estuaries and mangroves. It is an ovoviviparous species, ant its life cycle includes a planktonic larval stage and a sedentary adult stage. In the Bay Araçá it usually forms large aggregates on rocks and mangrove roots.

Author: Alvaro E. Migotto
Taxa: Littorina flava
Size: 1.0 - 10 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, macrophotography, adult, mangrove, rocky-shore
Hydroid
Hydroid
Dynamena crisioides is one of the species restricted to intertidal habitats along tropical and subtropical coasts.

Hydroid

Dynamena crisioides is one of the species restricted to intertidal habitats along tropical and subtropical coasts.

Author: Alvaro E. Migotto
Taxa: Dynamena crisioides
Size: 1.0 - 10 mm
Place: Ponta do Araçá, São Sebastião, SP, Brazil
Tags: benthic, macrophotography, intertidal, cebimar-usp, rocky-shore
Hydroid
Hydroid
Gonotheca, 60x.

Hydroid

Gonotheca, 60x.

Author: Alvaro E. Migotto
Taxa: Sertularia marginata
Size: 10 - 100 mm
Place: Ponta do Araçá, São Sebastião, SP, Brazil
Tags: benthic, cebimar-usp, sem, rocky-shore
Snail
Snail

Snail

Author: Alvaro E. Migotto
Taxa: Neritina virginea
Size: 1.0 - 10 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, soft bottom, macrophotography, intertidal, macrofauna, adult
Snail
Snail
.

Snail

.

Author: Alvaro E. Migotto
Taxa: Neritina virginea
Size: 1.0 - 10 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, soft bottom, macrophotography, intertidal, macrofauna, adult
Snail
Snail
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Snail

.

Author: Alvaro E. Migotto
Taxa: Neritina virginea
Size: 1.0 - 10 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, soft bottom, macrophotography, intertidal, macrofauna, adult
Snail
Snail

Snail

Author: Alvaro E. Migotto
Taxa: Nassarius vibex
Size: 10 - 100 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, soft bottom, macrophotography, intertidal, macrofauna, adult
Sand dollar
Sand dollar
The sand dollar Encope emarginata is found on soft sediments in the intertidal and subtidal zones

Sand dollar

The sand dollar Encope emarginata is found on soft sediments in the intertidal and subtidal zones

Author: Alvaro E. Migotto
Taxa: Encope emarginata
Size: 10 - 100 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, adult, sand beach
Crested caracara
Crested caracara
The crested caracara is a bird of prey with a varied diet including crabs and other invertebrates.

Crested caracara

The crested caracara is a bird of prey with a varied diet including crabs and other invertebrates.

Author: Alvaro E. Migotto
Taxa: Caracara plancus
Size: >100 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: mangrove, sand beach
Fire worm
Fire worm
The fire-worms are benthic animals that live under rocks and among other marine organisms; they have white, numerous, and large bristles that may cause skin irritation.

Fire worm

The fire-worms are benthic animals that live under rocks and among other marine organisms; they have white, numerous, and large bristles that may cause skin irritation.

Author: Alvaro E. Migotto
Taxa: Eurythoe complanata
Size: 10 - 100 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, cebimar-usp, adult, infauna
Nudibranch (sea slug)
Nudibranch (sea slug)
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Nudibranch (sea slug)

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Author: Alvaro E. Migotto
Taxa: Trapania
Size: 1.0 - 10 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, dark-field, adult, rocky-shore
Bryozoan
Bryozoan
Zoobotryum is common on the northern coast of São Paulo, especially in sheltered port areas. Their colonies are branched and whitish and resemble algae. It has been considered an invasive species in many parts of the world.

Bryozoan

Zoobotryum is common on the northern coast of São Paulo, especially in sheltered port areas. Their colonies are branched and whitish and resemble algae. It has been considered an invasive species in many parts of the world.

Author: Alvaro E. Migotto
Taxa: Zoobotryon verticillatum
Size: 10 - 100 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, mangrove, sand beach, rocky-shore
Entoprocta
Entoprocta
The Entoprocta (= Kamptozoa) comprise a phylum of solitary and colonial sessile animals, one of the least-known groups of the Animal kingdom and whose phylogenetic position is unclear and controversial. About 180 species have been described worldwide. Small, transparent and of cryptic habits, the Entoprocta are usually inconspicuous, although they are relatively common on hard substrates such as rocks, pebbles, corals, shells, and algae. They live as commensals of many species of invertebrates such as sponges, polychaetes, and sipunculans, often being found inside the tubes and galleries of their hosts. Closely resembling some bryozoans and hydrozoans in the general appearance and habit, they consist mainly of a distal region, called calyx, which contains a crown of ciliated tentacles, and a stem or stalk, which sustain the calyx and attaches it to the substrate through a dilated structure, characteristic of solitary species, or by stolons in colonial species.

Entoprocta

The Entoprocta (= Kamptozoa) comprise a phylum of solitary and colonial sessile animals, one of the least-known groups of the Animal kingdom and whose phylogenetic position is unclear and controversial. About 180 species have been described worldwide. Small, transparent and of cryptic habits, the Entoprocta are usually inconspicuous, although they are relatively common on hard substrates such as rocks, pebbles, corals, shells, and algae. They live as commensals of many species of invertebrates such as sponges, polychaetes, and sipunculans, often being found inside the tubes and galleries of their hosts. Closely resembling some bryozoans and hydrozoans in the general appearance and habit, they consist mainly of a distal region, called calyx, which contains a crown of ciliated tentacles, and a stem or stalk, which sustain the calyx and attaches it to the substrate through a dilated structure, characteristic of solitary species, or by stolons in colonial species.

Author: Alvaro E. Migotto
Taxa: Barentsia capitata
Size: 0.1 - 1.0 mm
Place: Praia de Barequeçaba, São Sebastião, SP, Brazil
Tags: benthic, cebimar-usp, dark-field, adult, epibiotic, rocky-shore
Snail
Snail
The tiny snail Olivella minuta can form dense populations in sandy or sandy-muddy sediments. As it moves around during low tides this snail leaves a grooved trail behind.

Snail

The tiny snail Olivella minuta can form dense populations in sandy or sandy-muddy sediments. As it moves around during low tides this snail leaves a grooved trail behind.

Author: Alvaro E. Migotto
Taxa: Olivella minuta
Size: 1.0 - 10 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, adult, mangrove, sand beach, infauna
Worm
Worm
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Worm

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Authors: Alvaro E. Migotto, Fabiane Gallucci, Gustavo Fonseca, Maikon Di Domenico
Taxa: Oligochaeta
Size: 0.1 - 1.0 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, soft bottom, meiofauna, intertidal, cebimar-usp, dic
Kinorhynch
Kinorhynch
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Kinorhynch

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Authors: Alvaro E. Migotto, Fabiane Gallucci, Gustavo Fonseca, Maikon Di Domenico
Taxa: Kinorhyncha
Size: 0.1 - 1.0 mm
Place: Baía do Araçá, São Sebastião, SP, Brazil
Tags: benthic, soft bottom, meiofauna, intertidal, cebimar-usp
  • Sponge
  • Egret bird
  • Snail
  • Hydroid
  • Hydroid
  • Snail
  • Snail
  • Snail
  • Snail
  • Sand dollar
  • Crested caracara
  • Fire worm
  • Nudibranch (sea slug)
  • Bryozoan
  • Entoprocta
  • Snail
  • Worm
  • Kinorhynch

Araçá Bay

The Araçá Bay (São Sebastião, State of São Paulo), within one of Brazil’s most beautiful coastlines, has small relict mangrove stands and a very diverse marine ecosystem. As such, the bay is a natural laboratory as well as important for local small-scale fishing.

Considered a natural area for expansion of the port of São Sebastião, the Araçá bay almost disappeared from the landscape. In 1987, the filling project of the bay was prevented by pressure from environmentalists and the scientific community. A year later, the bay was dredged for the placement of a sewage outfall, which caused profound ecological damage, habitat destruction, and death of organisms. For twenty years the sewage generated in the central region of the municipality was dumped in the vicinity of Araçá through this outfall, which remains operating without an environmental license. Moreover, the growing urbanization contributes to the environmental impacts on the bay, increasing the amount of waste and sewage dumped. In 2008, the threat of filling the remainder of the Araçá Bay was announced again.

However, although polluted and depleted, the Araçá insists to show vitality. Marine species that had disappeared as a result of the dredging reappeared several years after this ecological crime. Herons and spoonbills are seen more often in the shallow and muddy waters of the bay.

While far from its pristine condition, which partly motivated the creation of CEBIMar in the 1950s, the Araçá remains a place for studying and teaching. It is one of the most unique coastal marine environments - one of the few mangroves in the coast of São Sebastião, which harbors high biodiversity. 733 species were recorded for the area of which 34 were described as new to science, many have not been found elsewhere. In the list there are endangered species of polychaetes, echinoderms and hemichordates. Being a mangrove area, several marine species common to the region spend part of their life cycles in the bay, such as crustaceans and fish.

The Araçá is also home to species that are natural resources such as mollusks, shrimps and fish. Fishermen and shellfish gatherers take advantage of low tides to collect these resources for their own consumption or to market them in free markets.

The traditional knowledge and scientific data accumulated in more than 50 years of research show how the conservation of this region is important for science and for the lives of all who depend on it. Thus, there is an unquestionable need to protect species that insist on keeping the precious wealth of the bay of Araçá.

The reclamation of Araçá will not only destroy this complex ecosystem, the ecological damage will certainly not be restricted to the region. The rectification of the coastline will affect the dynamics of sedimentation in the channel, possibly causing siltation or erosion on nearby beaches. The desired sustainable relationship between tourism and environment rarely blooms in ports and industrial areas. São Sebastião has the responsibility to keep safe this fragile environmental heritage for the enjoyment of this and future generations.

References

2011 Felipelli T. Para Cetesb e prefeito de São Sebastião, Mangue do Araçá pode estar morto; ambientalistas apontam ao contrário. Imprensa Livre, url:http://www.imprensalivre.com.br/extras/top_impressao.php?edit=3&id=37874
2010 Amaral ACZ, Migotto AE, Turra A, Schaeffer-Novelli Y. Araçá: biodiversidade, impactos e ameaças. Biota Neotropica, 10(1): 219-264, url:http://www.scielo.br/pdf/bn/v10n1/a22v10n1.pdf