Geography of Aruba

The geography of Aruba, located at the juncture of the South American and Caribbean tectonic plates, has been shaped by a complex interplay of geological processes. From its flat expanses to its rugged coastlines, Aruba's geography and geology reveal the island's geographical diversity and its underlying geological formations, offering a comprehensive understanding of Aruba's terrain and environmental dynamics of this Caribbean destination.

Geography

Aruba (the westernmost island among the ABC Islands and of the Leeward Antilles) is situated in a unique geological location, right at the boundary between the South American and Caribbean tectonic plates. It is located north of the Venezuela coast and northwest of Curaçao. Aruba covers a total area of and a coast line of . This region is characterized by a complex fault system where the Caribbean Plate moves westward in relation to South America. Aruba is the westernmost island in the Aruba-La Blanquilla Chain, a series of small islands and atolls located along the Venezuelan continental border.

Aruba, as well as the rest of the ABC islands and also Trinidad and Tobago, lies on the continental shelf of South America, and is thus geologically considered to lie entirely in South America.

Landscape

The geography of Aruba is characterized by a relatively flat to gently rolling terrain with some low hills. The highest point on the island is Jamanota, reaching almost in elevation. There are three distinct types of landscapes on the island.

In the western part, features a gently sloping plain with shallow dry valleys. This area is flanked by a zone of horizontal bedded to slightly seaward-dipping limestone rocks on its western side. Moving towards the central part of the island, the terrain becomes more rugged. This region developed in the outcrop area of the metamorphosed volcanic rocks of the Aruba Lava Formation (ALF), and it features east-to-west running valleys controlled by faults. The southeastern part of Aruba is predominantly defined by Neogene and younger limestone formations. Along the eastern coast, near Boca Grandi and Seroe Colorado, well-developed Quaternary terraces can be observed. Forereef deposits line the south and southwestern coast between Ceru Colorado and the urban center of Oranjestad. Consequently, certain crops, such as aloe vera, thrive in this environment, due to the high calcium-rich soil known as liming. As of 2022, Aruba only has 2.3% of forest-covered land area and only 0.5% of protected natural area. In Aruba forest cover is around 2% of the total land area, equivalent to 420 hectares (ha) of forest in 2020, which was unchanged from 1990. In 2020, naturally regenerating forest covered 420 hectares (ha) and planted forest covered 0 hectares (ha). Of the naturally regenerating forest 0% was reported to be primary forest (consisting of native tree species with no clearly visible indications of human activity) and around 0% of the forest area was found within protected areas.

Elevations

Aruba is predominantly characterized by its flat terrain. However, there are notable exceptions that add diversity to its landscape. Two well-known rock formations, the Ayo and Casibari Rock Formations.

In contrast, the northern coast of Aruba features a more hilly topography, particularly within the Arikok National Park. The island's highest point, Jamanota, stands at a modest elevation of above sea level, while Arikok itself reaches . Another prominent landmark, Hooiberg, rises to . Despite not being the island's highest peak, Hooiberg appears as such due to its location in the flat surroundings. It is a recognizable feature that can be observed from nearly every point on the island.

Coastal form

In stark contrast to the southern shores, Aruba's northern sea is typically characterized by rough waters with a deep blue hue, rocky terrain and consists mostly of wave-cut coral limestone terraces interspersed with small sandy coves referred to as boca in Papiamento, which translates to "mouth" in English. The marine terraces of Aruba are most prominent on their windward, or northeast, coasts. In these areas, some of the terraces exhibit wide platforms and steep, angular backslopes. Conversely, on the leeward, or southwest, sides of the islands, the terraces tend to have narrower platforms and gentler backslopes. On occasion, particularly on the southwest side of Aruba, the backslopes are less distinct.

Aruba has a barrier reef, it generally lies about offshore and extends along the southwest coast between Punta Brabo and Oranjestad. It is composed of coral and is capped by a beach ridge of coral fragments in height. On the seaward side, the reef extends to a depth of at least .

Biogeography

Non-native species

Goats

Introduced in the early 16th century, feral goats (Capra hircus) and donkeys pose a significant threat to Aruba's environments, causing both direct and indirect harm due to excessive grazing. This often leads to ecosystem deterioration and a decline in biodiversity. Despite their impact, these animals remain a local food source, with goat stew and soup being popular dishes in the region. Arikok, spanning 20% of the country, is home to a substantial goat population. Recent research estimates the goat population at approximately 1,465 individuals by counting fresh pellets.thumb|Non-native lionfish distribution (1985 - 2020)

Lionfish

The lionfish, originally from the Indo-Pacific, were introduced to the Atlantic Ocean in the mid-1980s. Their population has since grown significantly because they lack natural predators in their new environment. This unchecked growth has led to a decline in fish and crustacean populations, and even the health of coral reefs is suffering as herbivorous fish vanish. NOAA researchers confirm that invasive lionfish populations will keep increasing and can't be eradicated using conventional methods.

Aruba LionFish Initiative (ALFI), a group of divers that regularly hunt invasive species, have taken the initiative to reduce the lionfish population in coastal areas by hunting them for food and crafting jewelry from their fins.

Boa constrictor

In 1999, the initial boa constrictor was discovered in Aruba. Despite attempts to control their growth, a population covering the entire island had taken hold by 2005. Being an invasive species, their adaptable diet can potentially endanger many native populations. A 2021 study examined the stomach contents of more than 500 captured Aruban boas. The findings revealed over 400 distinct prey types, with an almost equal distribution among mammals, lizards, and birds. Remarkably, aside from the seven known bat species in Aruba, nearly every other type of vertebrate was found in the stomach contents analyzed.

Cane toad

The Cane toad, also called Sapo locally, is an invasive species with a detrimental impact on Aruba's fauna, such as the Dori (Pleurodema brachyops). However, the Aruban Cat-eyed Snake or Santanero (Leptodeira bakeri) preys on these toads and is considered a natural "pest control". Toads favor damp environments, including (irrigated) gardens of residential homes and tourist accommodations, such as hotels and resorts. However, toads are true survivors and can easily adapt to drier conditions, as found in the arid climate of the Caribbean islands.

Anoles and geckos

In 2019, three new non-native reptiles have been discovered on Aruba, including Anolis gingivinus, Anolis cristatellus, Hemidactylus frenatus. Anole and gecko species are often unintentionally introduced to Caribbean islands through the live plant trade, but can also be intentionally introduced as pets. Similar to many non-native lizards in the Caribbean, these species often inhabit human-altered environments (anthropogenic habitats), and their impacts on Aruba's native species is not yet fully understood. Aruba has a recorded history of 10 previous introduction of non-native reptiles species, including two anoles, Anolis sagrei and A. porcatus, and four geckos, Gonatodes albogularis, G. antilensis, G. vittatus, and Hemidactylus mabouia.

Southern Oscillation impact

The rainy season typically occurs between September and January. However, it exhibits significant variability due to the strong influence of the Southern Oscillation. During strong El Niño years like 1911/1912, 1930/1931, 1982/1983 and 1997/1998 annual (fiscal year) rainfall can plummet to as little as . In contrast, during La Niña years like 1933/1934, 1970/1971, 1988/1989, 1999/2000 or 2010/2011, rainfall can soar to as much as . The highest monthly totals during these La Niña events can reach between .

Conservation geography

The origins of over-tourism can be traced back to the 1970s and 1980s when people first expressed concerns about the possible negative effects on society and the environment due to uncontrolled tourism growth. These concerns also included the long-term economic consequences.

Designated sites

The Arikok National Park Foundation (FPNA) oversees Key Biodiversity Areas (KBA). The KBA encompasses approximately 25% of Aruba's total surface area, these include Arikok National Park, Spaans Lagoen (Spanish Lagoon), marine park Aruba (MPA), and other designated terrestrial areas.

Environmental policies

Chemical pollution: Oxybenzone in sunscreen

The chemical Oxybenzone in sunscreen products is banned due to its harmful effects on marine life and coral reefs when it enters the ocean. This ban is part of the "Choose Zero" concept law aimed at educating the community about the ban. Oxybenzone is commonly used in sunscreen, plastics, cosmetics, hair spray, and nail polish as a UV protector and stabilizer. While it helps protect the skin from UV rays, it also causes severe damage to corals and can lead to hormonal imbalances. The ban includes the import, sale, and distribution of single-use plastic products and Oxybenzone-containing products. Scientific studies have shown that Oxybenzone negatively impacts corals and marine biodiversity, and its presence in concentrated areas irreversibly affects coral conditions. The law's main objective is to prevent further damage to nature and the environment, promoting a healthier quality of life without single-use plastics and Oxybenzone-containing products.

Even though regional zoning and marine conservation plans were put in place in 2019, Aruba's natural habitats and marine environment have been without protection for over a century. This lack of protection dates back to the days of phosphate (Aruba Phosphate Company), gold (Aruba Gold Concessions), and oil refining industries (Lago Oil and Transport Company and Arend Petroleum Company) in the 1920s, and the subsequent growth of large-scale tourism and urbanization since the late 1970s.thumb|300x300px|Coral sand from Aruba's beachRecent increases in the confiscation of these items have raised concerns that local residents may be involved in illegal sales to tourists. Instead of collecting these items, it's advisable to take a picture as a souvenir, as the removal of seashells can have a significant impact on the environment.

Ecological stressors

Light pollution

Aruba's infrastructure, including the tourism sector, was developed without considering the potential impacts of light pollution on the ecological environment and human experiences.

thumb|Leatherback hatchlings

All sea turtles species are endangered, including Leatherback, Loggerhead, Green and the Hawksbill, which are nocturnal wild life on Aruba. Artificial lighting can deter adult females from nesting or disorient emerging hatchlings, causing them to venture inland where they risk dehydration or harm.

International Dark-Sky Association-Aruba, a non-profit organization, aims to safeguard dark skies from light pollution. Over the past decade, the closure of the San Nicolas refinery has enabled the recovery of flora and fauna, while reducing light pollution, making the night sky brighter. However, the preservation of ecosystems faces increasing challenges with the expansion of the tourism zone and the construction of a new hotel in the southeast part of the island, Seroe Colorado.

Over-tourism

Over-tourism in Aruba is influenced by several key factors: Starting from the 1960s, Aruba's population grew significantly because of two main factors: the arrival of workers for the oil refining industry and later, the tourism industry. It's estimated that at least 45% of the population in Aruba was born in another country.

Noord/Tanki Leendert
Oranjestad West
Oranjestad East
Paradera
Santa Cruz
Savaneta
San Nicolas North
San Nicolas South

Cultural geography

Language distribution

According to the 2020 Census, 43.2% of Aruba's total population exclusively speaks Papiamento in their households. Among Aruba's 8 regions, 5 have over 50% of the population using only Papiamento at home, with Oranjestad East having the highest percentage at 56.6%, and San Nicolas South the lowest at 23.4%. Additionally, the Census indicates that 18.9% of the population reported Papiamento and Spanish as the two primary languages spoken in their households. In the regions Noord/Tanki Leendert and Oranjestad East, one in four persons speaks Papiamento and Spanish in the household, while San Nicolas North has the lowest percentage at 8.9%.

Census data also reveals that 9.4% of the population indicated that Papiamento and English were the two mostly spoken languages in the household. San Nicolas South and San Nicolas North are the 2 regions with the highest percentages of the population that speak Papiamento and English in the household at 28.7% and 12.3%, respectively. Papiamento and English are least spoken in households of persons living in the region of Santa Cruz (4.6%).

References

External links

Map of Aruba