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Bionews Print BIONEwS ISSUE 9 - 2017 1 Editor’s Letter 8 Saba: Horticultural Project 23 List of Acronyms 2 Green Sea Turtles Suffer from 9 Research Overview 24 Calendar Warming Seas: warmer oceans drive declining growth rates 11 Long-Term Projects 25 Members and Contact Overview 4 Saba: Goat Buy Back Project 26 References 18 Monitoring Overview 6 Hurricane Impacts on Bridled Quail-doves in St. Eustatius 22 Reports and Publications Editor’s Letter Dutch Carribean, November 2017 Climate change is arguably the most serious chal- collaboration are absolutely critical to ensure these lenge to conservation efforts within the Caribbean ancient creatures remain in our warming oceans. region, with future projections of sea level rise, in- Goats first made their way into Saba during colo- creasing air and sea surface temperatures, and more nization by the Dutch in the 1700s, and have since frequent and extreme weather events as well as the become the island’s main livestock. Nowadays, the pervasive threat of ocean acidification. In previous number of goats on Saba is very high, with many BioNews issues articles were published on the status roaming freely. The goats cause extensive damage of our coral reefs in the Dutch Caribbean which to Saba’s vegetation with loss of habitat and food for showed the devastating impact of global climate many terrestrial species. Saba’s overgrazed nature change on our reefs and the urgent need to increase has resulted in increase erosion and run-off, which their resilience so that they are better able to recover in turn threatens the health of the island’s coral from disturbances such as bleaching events. reefs. Thanks to generous funding support from The Netherlands Ministry of Economic Affairs “Nature Climate change is not only having a significant Fund”, the government of Saba has initiated a 3-year impact at the ecosystem level it is also threaten- project to cull most of Saba’s goat population and ing the survival of many species, including sea offer goat-owners a viable economic alternative in turtles. Sea turtles populations are effected by return. anthropogenic pressures from coastal development which destroys vital foraging and nesting grounds, Before Hurricanes Irma and Maria struck St Eustatius pollution from land-based and marine sources, and in September 2017, the islands had recorded the incidental as well as targeted capture of sea turtles. highest known density of Bridled Quail-doves Nesting beaches are under threat due to the impact in the region. However, a post-hurricane study, of sea level rise and issues related to the feminiza- made possible thanks to the generous support tion of turtle populations as a result of elevated nest of BirdsCaribbean’s fundraising appeal, found a temperatures. In this BioNews issue we report on a decrease in the population size and highlighted recent study by Bjorndal et al. (2017) who compiled concerns that the population may decline further the longest, most-wide spread data set for sea due to lack of food, predation and loss of habitat. turtles in the Western Atlantic. This includes data from Bonaire collected by Sea Turtle Conservation The Island Government of Saba, again thanks to Bonaire. The data provides strong evidence that, in funding support from The Netherlands Ministry of addition to other anthropogenic pressures, warmer Economic Affairs “Nature Fund”, is implementing oceans are driving declining growth rates of sea tur- a project which aims to stimulate and improve the tles. The human induced stressors on sea turtles has island’s local organic fruit and vegetable produc- been so severe that six of the known seven species of tion. This project will not only contribute to Saba’s sea turtle are at risk of extinction, with three catego- pro- environment image and provide locally grown rized as critically endangered by the IUCN Red List produce, but will also give the island new tourism of Threatened Species. Increasing their resilience opportunities through site tours or taste events. by controlling local threats as well as regional-wide 1 Bad News For Green Sea Turtles In An Age Of Warming Seas: warmer oceans drive declining growth rates To say that sea turtles are resilient is an un- are ectotherms, meaning that the regulation of derstatement. They have swum in our oceans their body temperature is dependent on exter- for close to 150 million years and survived the nal sources. This makes them very sensitive to extinction of dinosaurs as well as five major ice fluctuating environmental conditions. A recent ages. However, since the 1950s, a sharp in- study by Bjorndal et al. (2017) has looked into crease in human population growth, consump- the long-term effects of a changing climate on tion and technological advance has profoundly the physiology of individual green sea turtles, harmed nature. Our oceans have been used specifically their growth rate. Green turtles are as dumping grounds and have suffered from “long-lived, highly migratory, primarily herbivorous overfishing and coastal development, amongst mega-consumers that may migrate over hundreds many other pressures. As a result of this unprec- to thousands of kilometers” among neritic habitats edented anthropogenic impact, many changes and foraging grounds during their immature in ecosystem function, species distribution, and period (Bjorndal et al., 2017; Musick & Limpus, species abundance have taken place (Bjorndal 1997). Large, highly migratory ectotherms are et al., 2017). The impact on sea turtles has been particularly useful as bio-indicators of environ- so severe that six of the known seven species mental change at regional scales as their growth is of sea turtle are at risk of extinction, with three strongly influenced by environmental conditions categorized as critically endangered by the (Bjorndal et al., 2017). IUCN Red List of Threatened Species. Coastal development has destroyed vital foraging and Bjorndal et al. (2017) gathered growth rate data nesting grounds, pollution from land-based of green turtles throughout the Western Atlantic. and marine sources has directly impacted the The data set collected is the longest (1973 to health of turtles, and incidental capture as well 2015), most widespread (30 sites from Bermuda to as targeted capture has drastically reduced the Uruguay, including Bonaire with data collected by number of sea turtles in our oceans. Sea Turtle Conservation Bonaire (STCB)) and larg- est (9690 growth increments from 3958 individual Ocean warming is now emerging as a substantial turtles) dataset ever compiled for sea turtles threat to the survival of sea turtles. While sea in the Western Atlantic. Turtles were captured turtles have survived many fluctuations in climate through a variety of methods in mixed stock throughout their evolution, climate is now chang- foraging aggregations and tagged. Capture date, ing so rapidly that we cannot predict how they location, carapace length and primary diet at will adapt to these new conditions. This past each site were recorded. The Multivariate El Niño September, Category 5 Hurricane Irma came at Southern Oscillation Index (MEI) was selected to St. Maarten with so much strength that it devas- represent the intensity of an El Niño/Southern tated the island. According to Tadzio Bervoets, Oscillation (ENSO) event, which is the most manager of Nature Foundation St. Maarten, important coupled ocean-atmosphere phenom- about half of the island’s sea turtle population enon to cause global climate variability over time might have survived this storm (König, 2017). (NOAA, 2017). MEI is currently considered the With hurricanes gaining strength more rapidly most representative index for monitoring ENSO than ever before in the Caribbean Region due to as it combines the study of six meteorological and warming oceans, this is of great concern. oceanographic components: sea surface tem- perature (SST), surface air temperature, sea-level A number of studies have investigated the effect pressure, two components of surface winds, and of climate change on sea turtles, such as the loss total cloudiness of the sky (Mazzarella et al., of nesting beaches from sea level rise (Fish et 2013). Two strong thermal processes are believed al, 2008), the negative impact of warmer ocean to be the drivers behind the significant ecological temperatures on coral reefs (Hoegh-Guldberg, regime shift (ERS) that took place in 1997/1998: et al., 2007; Carpenter et al, 2008) and the femi- the abrupt warming from the strongest El Niño nization of turtle populations due to elevated Southern Oscillation (ENSO) event on record nest temperatures (Laloë et al, 2017). Sea turtles and the unprecedented warming rate over the 2 last two to three decades (Martinson et al., 2008; gathered standardized data from 52 seagrass Reid & Beaugrand, 2012; IPCC, 2014; Beaugrand sampling sites across the Wider Caribbean from et al., 2015; Wijffels et al., 2016). This resulted in 1993 to 2014, and 43% of sites had clear trends sudden ecological changes such as the extreme indicating environmental deterioration caused by global bleaching of reefs and changes in migration increased terrestrial run-off of fertilizers, sewage and reproduction timing of echinoderms, fish and sediments (van Tussenbroek et al., 2014; and seabirds, amongst others (Hoegh-Guldberg, Linton & Fisher, 2004). The substantial increase 2007; Martinson et al., 2008; Luczak et al., 2011; in inhabitants of coastal areas in the Caribbean Beaugrand et al., 2013, 2015; Ortega et al., 2013). Region since the 1990s coincides with the de- cline in sea turtle growth rates and substantial The study found a strong correlation between loss of seagrass beds (van Tussenbroek et al., MEI and green turtle growth rates. Green turtle 2014, Waycott et al., 2009; Mcleod et al., 2011). growth rates decreased when SST were above Hawksbills and loggerheads have also seen their a threshold between 25.9 and 26.0 °C (Bjorndal foraging grounds decline, with coral reefs as well et al., 2017).
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