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Growth of Juveniles of Two Species of Sea Urchins Under Three Different Diets

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Growth of Juveniles of Two Species of Sea Urchins Under Three Different Diets FA ULTAD DECll:1'.CI DEL MAR Growth of juveniles of two species of sea urchins under three diff erent diets Sandra Muñoz Entrena Grado en Ciencias del mar Universidad de Las Palmas de Gran Canarias Tutor: Dra. María Dolores Gelado Caballero Cotutor: Dr. Eugenio De J. Carpizo ltuarte Firma tutor: Firma estudiante: Firma cotutor: Index Abstract………………………………………………………………….….3 1. Introduction………………………………………………………………...4 1.1. The sea urchins Arbacia stellata and Lytechinus pictus…..………....4 1.2. Characteristics of sea urchins………………………….……………...5 1.3. Growth ………………………………………………….……………...6 1.4. Composition of food…………………………………………….……...7 2. Background………………………………………………………….……...8 3. Objective…………………………………………………………..………..9 4. Material and methods……………………………………………………...9 4.1. Maintenance…………………………………………………………....9 4.2. Measurements………………………………………………………….10 5. Results……………………………………………………………………….11 5.1. Lytechinus pictus……………………………………………………….11 5.2. Arbacia stellata………………………………………………………....16 6. Discussion………………………………………………………………...…20 7. Preminilary Conclusions…………………………………………..............22 8. References….…………………………………………………………….….23 ABSTRACT The general observation that organisms are adapted to their environment lies at the foundation of biology (Yokota et al, 2002). The evolutionary and ecological framework implies to the organism a suite of adaptative responses (biochemical, physiological, behavioural) which together enable it to survive and to reproduce within a particular set of environmental conditions (Yokota et al, 2002). Marine coastal habitats are characterized by high environmental variability. It is believed that, due to adaptation or acclimation to natural environmental variability, intertidal species may have some capacity to recover from future changes (Yokota et al, 2002). Urchins are considered keystone species in ecosystems as their Aristotle’s lantern is adapted for biting, tearing and scrasping and can even function to grab the substrate. They are herbivores although, some of them, in particular situations they behave like omnivores. The regular echinoids seem to have the widest spectrum of food types included soft-bodied organisms (plant and animals), hard surfaces (rock with incrusting or boring plants and animals) or hard animals (corals and bivalves), and soft substrate. The present study focuses on evaluating the effects of three different diets (the giant kelp, Macrocystis pyrifera, a formulated food and combination of both) on the growth of two species of juvenile sea urchin (Lytechinus pictus and Arbacia stellata). Both species are inhabitants of the Pacific coast of Baja California, with A. Stellata increasing their range extension to the north, due to the more common presence of warmer ocean waters in front of Baja California. For this purpose, measurements of weight and size of the organisms, were made every 15 days for three months. Aditionally, temperature, pH, oxygen, sea water flow and behavior of the sea urchins were monitored. In the present study we use M. pyrifera, since is an abundant natural food resource in Baja California used by different species of sea urchins. We also used a formulated mircoencaspulated diet because was expected to have a positive effect on the growth of sea urchins in captivity. Knowing the growth response to different diets of these common especies in Baja California, will help us to conduct future studies to understand its posible interaction in the ocean and predict posible impacts of the increasing presence of A. Stellata along the coast of Baja California. 3 1. Introduction 1.1. The sea urchins Arbacia stellata and Lytechinus pictus Sea urchins live in different marine habitats, from intertidal to deep-sea environments up to 6800 m including the Artic and Antarctic Oceans (Yokota, 2002). The starry sea urchin Arbacia stellata (Figure 1), is distributed along the Pacific coast of North, Central and South America from southern California to Peru, and also includes the Galapagos Islands and the mainland and peninsular coasts of the Gulf of California (Mortensen, 1935; Clark 1948; Brusca, 1980; Houston 2006). Probably the populations of the sea urchin Arbacia stellata present in the Gulf of California and in the outer area of the Pacific coast are the result of the colonization of the Panama region (Díaz et al.,2017), a recruitment event in warmer waters (Burcham and Caruso, 2015). For the white sea urchin, Lytechinus pictus (Figure 2), occurs on Eastern Pacific. No collection records were found at depths greater than 200 m for the species Lytechinus pictus (Conejeros-Vargas et al, 2017). Both species thrive in the Gulf of California, in Peru and in the Galapagos Islands, but El Niño conditions in 1997 and 1998 and currents carrying their larvae brought them reportedly as far north as the Channel Islands off Southern California. When conditions are suitable and coastal currents transport larvae northward until southern California and beyond, seeing warm-temperate and subtropical Figure1. Images of the aboral (left) and oral (right) views of a juvenile of Arbacia stellata. Figure2. Images of the aboral (left) and oral (right) views of a juvenile of Lytechinus pictus used in the present study. species is not uncomm (Clark, S, 2015). 4 1.2. Characteristics of sea urchins Although sea urchins differ between species, their general characteristics are interesting. They present a globular body and a radial arrangement of organs, shown by five bands of pores running from mouth to anus over the test (internal skeleton) (Figure 3) (Encyclopædia Britannica, 2019). The pores accommodate tube feet (Encyclopædia Britannica, 2019), which is a hydraulic structure that echinoderms have, and the tube feet are also known for their roles in light sensitivity, respiration, chemoreception and locomotion (Lesser et al, 2011). From nodules on the test arise long, movable spines and pedicellariae (pincerlike organs) (Encyclopædia Britannica, 2019); whose functions include locomotion, sensing, and protection from physical trauma and predators (Tsafnat et al, 2012). The anus opens upwards and the mouth downwards. Figure 3. A, Internal structure of a sea urchin; water-vascular system in tan. B, Detail of portion of endoskeleton. Source: biocyclopedia Britanica. The structure of the mouthpart in the sea urchin was analysed and described by Aristotle (384-322 BC), which he called the Aristotle’s lantern. The mouth is composed of five protruding teeth. The Aristotle’s lantern allows some urchins to excavate hiding places for example, in coral or rock (Encyclopædia Britannica, 2019). Furthermore, Aristotle’s lantern also allows them have a wider spectrum of food types. Sea urchins consume the food that is available in the field, although they show preferences when they have a choice. Preference of certain food is from attractants, incitants, stimulants and deterrents present in potential food, and also its physical characteristics (Lawrence et al., 2013). Sea urchins form spatial agregations in response to the density of the food. 5 Urchins move further in areas where their algal food is less plentiful. This leads to the accumulation of urchins in areas with abundant algae (Abraham, 2007). Due to its wide spectrum of food types, sea urchins are considered a keystone species. A keystone species is an organism that helps define an entire ecosystem (Society, 2019). Almost all examples of keystone species are animals that have a huge influence on food webs. In the case of sea urchins, they are important to combat invasive algae on corals reefs. Anthropogenic activities such as fishing can modify food webs and impact sea urchin populations (Duggins et al, 1989). The coral reefs affected by human fishing have more intense urchins-kelp interactions than those that are not affected, due to the increase of sea urchins in the first case (Hay, 1984). Sea otters also control certain species of sea urchins along the northeastern coast of the Pacific, creating new scenarios of seaweed and sea urchins, the same as storm events through the destructive removal of sea urchins or algae (Ebeling et al., 1985). 1.3. Growth of sea urchins Growth supposes the change in weight or diameter of the sea urchins, which implies extension by calcification and production of soft tissues (Barrera, 2018). Echinoid skeletons consist of ossicles that include spines, limestone elements of the Aristotle lantern and plates that are joined together by small projections of collagen threads (Telford, 1985; Barrera, 2018). The growth is done by calcification around the individual plaques, also known as ossicles, as well as by the creation of new plaques at the anal end of the ambulacral and interambulacral rows (Barrera, 2018). The growth of the ossicles in echinoids is the result of the creation of an organic matrix in the calcification process (Dubois and Chen, 1989; Barrera, 2018). Factors such as temperature, water quality (Raymond and Scheibling, 1987) light, environmental and climatic variables (Russell, 1998), the density of individuals, food availability and composition of the diet (Hammer, 2005) can modify the growth rate of the sea urschins. Correlation between adult growth and longevity may be related to the allocation of resources to growth and reproduction and to predictable recruitment (incorporation of individuals into a population) of new individuals (Ebert, 1975). Species that grow rapidly and allocate large amounts to reproduction may compromise resources available for maintenance. Because they are short lived as adult,
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