1 00:00:08,097 --> 00:00:13,271 First, I'll introduce myself. My name is Inmaculada Herrera, 2 00:00:13,520 --> 00:00:15,360 for those who don't know me. 3 00:00:15,546 --> 00:00:21,004 I will talk a little bit about my career. 4 00:00:22,690 --> 00:00:26,577 I was a student of Marine Sciences, here at the ULPGC, 5 00:00:27,377 --> 00:00:31,902 and in third year, I was interested in Biological Oceanography, 6 00:00:32,240 --> 00:00:34,480 so I decided 7 00:00:34,897 --> 00:00:37,733 to ask professors, among them Santiago, 8 00:00:37,946 --> 00:00:41,555 to work and learn about what they were doing in the lab. 9 00:00:43,262 --> 00:00:46,488 There, as a student, 10 00:00:46,640 --> 00:00:49,190 I worked with plankton, with OPC, 11 00:00:49,340 --> 00:00:50,817 a particle counter. 12 00:00:51,690 --> 00:00:57,608 Also, they offered me to continue and do a second-cycle thesis, 13 00:00:58,000 --> 00:01:01,137 both with Santiago and Antonio Barrera, 14 00:01:01,290 --> 00:01:03,591 who works in Taliarte, at the ICCM. 15 00:01:05,235 --> 00:01:09,448 I found out that I liked it and wanted to continue researching. 16 00:01:09,573 --> 00:01:11,200 When I finished my degree, 17 00:01:11,511 --> 00:01:14,890 I decided to continue with the PhD in Oceanography, 18 00:01:15,413 --> 00:01:17,324 and this is where I am now. 19 00:01:18,204 --> 00:01:20,808 Brief, but clear, right? 20 00:01:21,724 --> 00:01:25,520 So I encourage those of you, who are in the degree.... 21 00:01:25,964 --> 00:01:29,271 What year are you in? Have you already finished? 22 00:01:29,570 --> 00:01:31,306 -First year. -First year? 23 00:01:31,946 --> 00:01:35,288 Well, I encourage you, if you really like it, 24 00:01:35,733 --> 00:01:38,133 to dare to talk to professors, 25 00:01:38,300 --> 00:01:41,466 and try to volunteer to learn 26 00:01:41,804 --> 00:01:44,106 the different lines that are there. 27 00:01:44,373 --> 00:01:49,653 Whether in Biological Oceanography or General Chemistry or another area. 28 00:01:51,688 --> 00:01:54,044 At the end of the talk, 29 00:01:54,195 --> 00:01:58,213 I'll explain what career opportunities there are for research, 30 00:01:58,490 --> 00:02:01,511 and especially I will focus on the grants. 31 00:02:03,182 --> 00:02:06,097 Okay, so we'll move on to the.... Okay. 32 00:02:32,488 --> 00:02:36,231 Well, this is part of my PhD thesis. 33 00:02:36,684 --> 00:02:40,755 There is a first part of laboratory experiments, 34 00:02:41,155 --> 00:02:45,475 and another part of how to take the results found in the laboratory 35 00:02:45,617 --> 00:02:50,444 to samples collected in the natural environment, in the sea. 36 00:02:52,693 --> 00:02:54,000 Good. 37 00:02:54,860 --> 00:02:59,991 I'm going to present a study on the effect of temperature, 38 00:03:00,142 --> 00:03:04,177 and food concentration on the growth of copepods. 39 00:03:04,320 --> 00:03:07,200 In this case, we have used the species... 40 00:03:07,377 --> 00:03:08,684 It isn't very clear. 41 00:03:08,840 --> 00:03:12,524 The species Paracartia grani, described by Sars in 1904. 42 00:03:12,862 --> 00:03:16,311 It's a species very characteristic of coastal areas, 43 00:03:16,450 --> 00:03:19,200 conditioned by factors such as temperature 44 00:03:19,350 --> 00:03:21,733 and biological factors such as food. 45 00:03:22,968 --> 00:03:26,586 It is found, according to literature, in the Atlantic, 46 00:03:27,070 --> 00:03:31,386 in Canary waters, as well as on the Portuguese coasts, 47 00:03:31,893 --> 00:03:36,035 and also in the western part of the Mediterranean. 48 00:03:37,050 --> 00:03:39,982 This species, with the family Acartiidae, 49 00:03:40,133 --> 00:03:42,900 is one of the most common in coastal areas, 50 00:03:43,048 --> 00:03:46,248 and can be found all over the world. 51 00:03:46,960 --> 00:03:50,284 In addition, copepods 52 00:03:50,435 --> 00:03:55,680 are the most abundant organisms of the zooplankton, 53 00:03:56,044 --> 00:03:58,693 and an important component of the diet 54 00:03:58,880 --> 00:04:00,986 of many planktonic species. 55 00:04:01,920 --> 00:04:04,817 Therefore, our objectives have been 56 00:04:05,150 --> 00:04:08,764 to see the effect of temperature and food concentration 57 00:04:08,930 --> 00:04:10,888 on the growth of this species, 58 00:04:11,217 --> 00:04:12,995 and to see the relationship 59 00:04:13,226 --> 00:04:15,893 between a direct method, somatic growth, 60 00:04:16,044 --> 00:04:20,190 and an indirect one with the enzyme aminoacyl-tRNA synthetase, 61 00:04:20,320 --> 00:04:22,026 which I will explain later. 62 00:04:24,462 --> 00:04:29,360 To do that, I had the possibility of staying twice in Barcelona, 63 00:04:30,170 --> 00:04:34,364 and thanks to the zooplankton group of the ICM, 64 00:04:34,550 --> 00:04:37,102 and their cultures of Paracartia grani, 65 00:04:37,253 --> 00:04:40,330 Oxyrrhis marina, and Rhodomonas baltica, 66 00:04:40,510 --> 00:04:43,804 I was able to carry out this type of experiments. 67 00:04:44,515 --> 00:04:47,555 Every 24h, we collected 68 00:04:47,813 --> 00:04:49,550 Paracartia grani eggs, 69 00:04:50,240 --> 00:04:52,890 and preserve them until their later use 70 00:04:53,066 --> 00:04:55,777 for the experiments. 71 00:04:56,551 --> 00:05:00,435 We performed different experiments at different temperatures. 72 00:05:01,786 --> 00:05:03,884 In a chamber at 20ºC, 73 00:05:04,844 --> 00:05:07,724 we put six baths at different temperatures, 74 00:05:07,940 --> 00:05:09,786 the ideal ones for us, 75 00:05:10,020 --> 00:05:14,471 since being a species that is found around the world, 76 00:05:14,630 --> 00:05:18,711 it can vary between different orders of magnitude, 77 00:05:19,182 --> 00:05:20,808 and we saw that... 78 00:05:22,453 --> 00:05:25,706 We added a tank with 10l of filtered seawater, 79 00:05:26,017 --> 00:05:28,780 and introduced, when it was well tempered, 80 00:05:29,813 --> 00:05:31,697 a quantity of eggs. 81 00:05:32,310 --> 00:05:35,902 We waited between 16 and 24h until they hatched, 82 00:05:36,530 --> 00:05:39,591 obtaining an abundance of two nauplii per ml. 83 00:05:40,210 --> 00:05:45,386 These experiments were fed in saturation with Oxyrrhis marina. 84 00:05:46,820 --> 00:05:51,662 On the other hand, we have experiments at different food concentrations. 85 00:05:52,490 --> 00:05:54,408 We put seven baths, 86 00:05:54,808 --> 00:05:59,342 at the temperature of the chamber itself, 20ºC. We didn't change it. 87 00:05:59,960 --> 00:06:02,684 We put the eggs 88 00:06:03,120 --> 00:06:05,351 in 10l of filtered seawater, 89 00:06:05,528 --> 00:06:08,790 with two nauplii per ml, as in the previous ones, 90 00:06:08,960 --> 00:06:11,020 with a food concentration 91 00:06:11,200 --> 00:06:13,410 between 0 μg of carbon per litre 92 00:06:13,770 --> 00:06:16,097 up to 880 μg of carbon per litre. 93 00:06:16,808 --> 00:06:18,115 Good. 94 00:06:21,208 --> 00:06:22,844 The food concentration 95 00:06:23,031 --> 00:06:26,177 of Oxyrrhis marina and Rhodomonas baltica 96 00:06:28,040 --> 00:06:30,311 were measured by a particle counter 97 00:06:30,533 --> 00:06:33,484 every 12 or 24h, depending on the experiment. 98 00:06:33,800 --> 00:06:38,888 Also, we took three 100 ml replicates of nauplii cultures, 99 00:06:39,102 --> 00:06:40,800 They were fixed with Lugol, 100 00:06:41,057 --> 00:06:43,480 and we measured length, and abundance. 101 00:06:44,702 --> 00:06:48,180 Using an inverted microscope with a built-in camera, 102 00:06:48,417 --> 00:06:52,400 we took photos corresponding to each individual, 103 00:06:52,800 --> 00:06:58,577 and with the software ImageJ, we got the length of the prosome. 104 00:06:59,040 --> 00:07:01,484 Once the prosome length was obtained, 105 00:07:01,831 --> 00:07:04,097 using the Durbin and Durbin equation 106 00:07:04,311 --> 00:07:07,420 of 1978 for Acartia clausi, 107 00:07:07,660 --> 00:07:09,422 we obtained the dry weight. 108 00:07:09,600 --> 00:07:13,031 Once we got it, we converted it to carbon 109 00:07:13,644 --> 00:07:18,604 with the 0.40 ratio by Postel et al. in 2000. 110 00:07:19,164 --> 00:07:25,300 In turn, we also obtained the temperature quotient Q10. 111 00:07:28,008 --> 00:07:29,102 Good. 112 00:07:29,235 --> 00:07:32,620 You may be wondering why this enzyme, why not another 113 00:07:32,800 --> 00:07:34,620 and what is this. 114 00:07:35,050 --> 00:07:37,884 The enzyme aminoacyl-tRNA synthetase 115 00:07:38,020 --> 00:07:42,000 catalyzes the first step of protein synthesis, aminoacylation. 116 00:07:42,213 --> 00:07:46,915 Hence, its interest, and relationship with growth. 117 00:07:47,670 --> 00:07:53,884 This has been used previously in other species, 118 00:07:54,030 --> 00:07:59,786 both in fish and bacteria, etc., but with radioactive isotopes. 119 00:07:59,960 --> 00:08:02,160 What we have used 120 00:08:03,070 --> 00:08:05,991 is Chang's method of 1984, 121 00:08:06,124 --> 00:08:09,066 modified by Yebra and Hernández-León in 2004, 122 00:08:09,240 --> 00:08:13,688 which does not use radioactive isotopes, 123 00:08:13,911 --> 00:08:17,706 and it is an easy, simple, colorimetric method, 124 00:08:17,860 --> 00:08:21,688 where we only need a spectrophotometer in the laboratory. 125 00:08:22,711 --> 00:08:25,084 This enzyme releases pyrophosphate, 126 00:08:25,964 --> 00:08:28,970 and we used a pyrophosphate reagent, 127 00:08:29,137 --> 00:08:33,090 and we measured the release by NADH oscillation. 128 00:08:33,573 --> 00:08:35,875 This is reflected as a decrease 129 00:08:36,053 --> 00:08:39,422 in absorbance at 340 nm wavelength, 130 00:08:39,920 --> 00:08:42,302 ultraviolet in the spectrophotometer. 131 00:08:44,924 --> 00:08:46,017 Good. 132 00:08:46,220 --> 00:08:49,057 From each experiment, 133 00:08:49,350 --> 00:08:53,724 we took three aliquots of 1000 individuals, 1000 nauplii, 134 00:08:54,097 --> 00:09:00,035 placed them in liquid nitrogen, and stopped the activity immediately. 135 00:09:00,550 --> 00:09:05,173 We homogenized those samples with buffer, 136 00:09:05,831 --> 00:09:09,582 and then centrifuged them at 5000 rpm 137 00:09:09,893 --> 00:09:11,760 for 10 min at 0ºC. 138 00:09:14,170 --> 00:09:17,457 Once the sample was centrifuged, 139 00:09:17,610 --> 00:09:20,186 we took 250 μL of the supernatant, 140 00:09:20,435 --> 00:09:24,177 plus 250 μL of the pyrophosphate, of the reagent, 141 00:09:24,391 --> 00:09:26,170 plus 300 μL of MilliQ water. 142 00:09:26,515 --> 00:09:29,980 With this mixture, we put it in the spectrophotometer, 143 00:09:30,124 --> 00:09:34,826 and read the absorbance at a temperature of 25°C for 10 min. 144 00:09:36,915 --> 00:09:41,404 To obtain the pyrophosphate release 145 00:09:41,910 --> 00:09:45,804 by NADH oxidation, we use the following equation 146 00:09:45,960 --> 00:09:48,720 given by Yebra et al. in 2004. 147 00:09:49,146 --> 00:09:52,340 To correct the temperature, a fundamental factor, 148 00:09:52,540 --> 00:09:58,195 because it affects metabolic activities, 149 00:09:58,515 --> 00:10:02,350 we use the equation given by Yebra and co-workers in 2005, 150 00:10:02,542 --> 00:10:06,773 and with an activation energy of 8.57 kcal per mole. 151 00:10:07,413 --> 00:10:11,582 This way, we obtain the in situ activation energy. 152 00:10:11,964 --> 00:10:14,755 Sorry, the in situ activity of the enzymes. 153 00:10:15,075 --> 00:10:18,604 But we were looking for the specific enzyme activity. 154 00:10:18,840 --> 00:10:23,297 So, we also calculate the protein content of the samples. 155 00:10:24,391 --> 00:10:29,048 We use the Lowry method, modified by Rutter in 1967. 156 00:10:29,920 --> 00:10:33,395 We take from the same sample 157 00:10:33,620 --> 00:10:36,986 of the enzymatic activity 200 μl of the supernatant. 158 00:10:37,146 --> 00:10:38,920 We add 1000 μl of Rutter, 159 00:10:39,093 --> 00:10:41,235 wait 10 minutes, 160 00:10:42,053 --> 00:10:46,231 and then, after this time, we add 100 μl of FOLIN, 161 00:10:46,890 --> 00:10:49,111 wait 40 minutes in darkness, 162 00:10:49,980 --> 00:10:52,906 and proceed to read in the spectrophotometer. 163 00:10:53,973 --> 00:10:57,288 As standard, we used Bovin Serum Albumin 164 00:10:57,653 --> 00:11:00,530 from 5 to 500 µg proteins per ml. 165 00:11:01,564 --> 00:11:06,133 Good. Having done all this, we move on to the results. 166 00:11:09,484 --> 00:11:14,360 Here is the weight in nanograms of carbon versus days, 167 00:11:14,542 --> 00:11:19,430 and we see a positive linearity in the different experiments. 168 00:11:19,860 --> 00:11:24,186 The slope of each experiment 169 00:11:24,328 --> 00:11:27,164 is the growth rate, 170 00:11:27,333 --> 00:11:32,088 which ranges from 0.28 to 0.85 per day. 171 00:11:32,595 --> 00:11:36,115 This means that each individual 172 00:11:36,337 --> 00:11:41,164 is capable of or has a growth rate of 28% to 85% 173 00:11:41,448 --> 00:11:43,164 of their daily body mass. 174 00:11:44,808 --> 00:11:46,515 Well, obtained this, 175 00:11:46,817 --> 00:11:50,915 we represented the growth rate versus temperature, 176 00:11:51,102 --> 00:11:53,390 as well as the specific activities 177 00:11:53,660 --> 00:11:56,195 versus temperature and per individual, 178 00:11:56,330 --> 00:11:57,617 which we also did. 179 00:11:57,813 --> 00:12:01,120 And we see that they have a good correlation 180 00:12:01,440 --> 00:12:02,906 both parameters. 181 00:12:03,128 --> 00:12:08,871 A high correlation of 0.98 for somatic growth, 182 00:12:09,271 --> 00:12:11,617 0.94 for specific activity, 183 00:12:11,786 --> 00:12:15,102 and 0.85 for activity per individual. 184 00:12:16,730 --> 00:12:18,284 And when we compare, 185 00:12:19,404 --> 00:12:22,400 which is one of the objectives also mentioned, 186 00:12:22,590 --> 00:12:26,737 growth versus specific activity, 187 00:12:27,040 --> 00:12:28,826 specific enzyme activity, 188 00:12:29,057 --> 00:12:34,835 we find a good correlation between both parameters. 189 00:12:34,980 --> 00:12:38,195 Together with the results found 190 00:12:38,320 --> 00:12:41,520 by Yebra et al. in 2005 for Calanus helgolandicus, 191 00:12:41,710 --> 00:12:44,986 and Yebra et al. in 2006 for Calanus finmarchicus, 192 00:12:45,155 --> 00:12:48,830 we can say that the enzyme activity really 193 00:12:49,010 --> 00:12:53,244 is a good index, a good profit of growth 194 00:12:53,600 --> 00:12:58,515 for Paracartia grani, when feeding in saturation. 195 00:13:00,346 --> 00:13:02,888 Okay, now we turn to the results 196 00:13:03,310 --> 00:13:07,662 of the experiments with different food concentrations. 197 00:13:09,173 --> 00:13:13,982 Again, we plot the weight, in ng of carbon, versus time, 198 00:13:14,120 --> 00:13:18,373 and find a positive linearity, 199 00:13:18,968 --> 00:13:22,808 ranging from -0.01 to 0.68. 200 00:13:23,724 --> 00:13:28,613 When plotting growth versus food concentrations, 201 00:13:29,022 --> 00:13:32,266 it meets the requirements of a saturation curve, 202 00:13:32,426 --> 00:13:35,235 that is, it fits an Ivlev curve. 203 00:13:36,430 --> 00:13:42,524 We see that a poor feeding 204 00:13:43,182 --> 00:13:47,182 has a lower growth than with higher food concentration. 205 00:13:48,190 --> 00:13:52,675 But something that surprises us is how the specific activity 206 00:13:52,960 --> 00:13:55,180 does not follow the same behaviour. 207 00:13:55,350 --> 00:13:58,088 The lower the growth, 208 00:13:58,284 --> 00:14:02,551 the higher the enzyme activity. 209 00:14:03,013 --> 00:14:04,750 We will explain this later. 210 00:14:05,128 --> 00:14:10,053 When we plot growth versus AARS, it appears negative. 211 00:14:10,231 --> 00:14:16,746 We expected it to give a positive and significant relationship 212 00:14:17,020 --> 00:14:20,177 as in the individual specific activity. 213 00:14:20,515 --> 00:14:22,000 What happens here? 214 00:14:22,417 --> 00:14:27,813 If we look closely, when we compare the specific enzyme activity 215 00:14:28,320 --> 00:14:30,595 versus biomass per individual, 216 00:14:30,844 --> 00:14:33,297 we see that it presents 217 00:14:37,288 --> 00:14:41,075 three different relationships. 218 00:14:42,471 --> 00:14:46,488 The green circles represent high food concentrations; 219 00:14:46,720 --> 00:14:49,093 the triangles, medium saturations; 220 00:14:49,620 --> 00:14:55,893 and the white circles, food starvation. 221 00:14:56,320 --> 00:15:02,008 That is, they did not have enough food to feed themselves. 222 00:15:03,182 --> 00:15:08,391 When we look at the daily growth versus the specific activity, 223 00:15:08,950 --> 00:15:12,168 we see that, when they are starving, 224 00:15:14,570 --> 00:15:16,764 what they really have.... 225 00:15:18,871 --> 00:15:21,324 It's like when we start a diet. 226 00:15:21,610 --> 00:15:24,791 They use their own lipid reserves to grow. 227 00:15:25,022 --> 00:15:28,755 So protein degradation is greater than synthesis. 228 00:15:29,022 --> 00:15:33,840 And when they are in food saturation, they grow happily. 229 00:15:34,240 --> 00:15:38,462 There is a better relationship 230 00:15:38,620 --> 00:15:41,155 between growth and enzyme activity. 231 00:15:42,995 --> 00:15:45,448 Well, now to conclude, 232 00:15:46,320 --> 00:15:51,191 I would like to comment that the growth and enzyme activity 233 00:15:51,330 --> 00:15:54,151 of Paracartia grani nauplii depend 234 00:15:54,328 --> 00:15:57,182 on temperature and food concentration, 235 00:15:57,822 --> 00:16:01,555 and, furthermore, the enzymatic activity 236 00:16:02,817 --> 00:16:06,222 is a valid index to use it 237 00:16:06,480 --> 00:16:09,991 as somatic growth for this species 238 00:16:10,220 --> 00:16:15,991 when feeding under saturated conditions. 239 00:16:16,737 --> 00:16:19,351 In addition, the results presented here, 240 00:16:19,528 --> 00:16:21,180 plus the previous results, 241 00:16:21,395 --> 00:16:24,488 mean that it is a good tool for estimating 242 00:16:24,648 --> 00:16:27,111 somatic growth in copepods. 243 00:16:29,010 --> 00:16:32,364 I would like to thank the different institutions, 244 00:16:32,515 --> 00:16:35,271 that have helped me with these experiments 245 00:16:35,466 --> 00:16:38,186 and to carry out my PhD thesis. 246 00:16:38,840 --> 00:16:42,560 Thanks to all of you, to Avelina, to the whole group. 247 00:16:43,080 --> 00:16:48,488 Finally, I wrote my email in case you want to contact me. 248 00:16:48,631 --> 00:16:51,430 So you can have it, as it'll be published. 249 00:16:51,635 --> 00:16:55,191 And I am ready to listen to any questions you may have. 250 00:17:02,910 --> 00:17:04,133 I have a question. 251 00:17:04,328 --> 00:17:06,890 Could you put the last graph? 252 00:17:09,102 --> 00:17:10,488 -This one? -Yes. 253 00:17:10,702 --> 00:17:12,480 On this left one, 254 00:17:13,262 --> 00:17:15,893 for those with food saturation…? 255 00:17:16,204 --> 00:17:18,311 On the left, on the other side. 256 00:17:18,524 --> 00:17:20,610 They don't follow a pattern, why? 257 00:17:20,755 --> 00:17:24,808 Because those in starvation are grouped together, 258 00:17:25,022 --> 00:17:30,284 those in intermediate levels too, but the others are scattered. 259 00:17:30,515 --> 00:17:31,804 Why? 260 00:17:32,106 --> 00:17:33,800 You mean they're over here? 261 00:17:33,930 --> 00:17:35,511 Yes, they are dispersed. 262 00:17:35,620 --> 00:17:40,524 It is because the starving ones do not have time to molt. 263 00:17:40,750 --> 00:17:43,342 We only have previous stages, that is, 264 00:17:43,680 --> 00:17:46,177 the nauplii reach up to 6 stages, 265 00:17:46,337 --> 00:17:48,370 until they reach copepodite. 266 00:17:48,533 --> 00:17:52,088 So, this is by individual biomass. 267 00:17:52,350 --> 00:17:55,306 They don't reach different stages, 268 00:17:55,520 --> 00:17:59,244 they don't molt, and don't pass to the next stage. 269 00:17:59,600 --> 00:18:03,475 Whereas, the others, from the beginning they start to molt. 270 00:18:03,715 --> 00:18:07,973 So, they grow, they go from stage to stage. 271 00:18:08,151 --> 00:18:11,768 So, we see different stages of growth? 272 00:18:11,955 --> 00:18:15,857 It is because of a higher biomass, which is related 273 00:18:17,190 --> 00:18:19,502 to the stage of each individual. 274 00:18:19,690 --> 00:18:22,515 Doesn't growth depend on the amount of food? 275 00:18:23,390 --> 00:18:27,697 Growth depends on the present amount of food. 276 00:18:28,026 --> 00:18:33,191 If you do not have enough food, 277 00:18:33,342 --> 00:18:38,471 your growth will be less than with more food. 278 00:18:38,711 --> 00:18:42,000 Yes, when they're grouped in different experiments, 279 00:18:42,213 --> 00:18:44,613 but when they're at saturated levels, 280 00:18:44,924 --> 00:18:48,000 I don't know, maybe it's an interpretation… 281 00:18:48,222 --> 00:18:52,810 But they grow independently of the concentration. 282 00:18:53,280 --> 00:18:56,293 You say that low feed levels 283 00:18:56,460 --> 00:18:58,542 don't allow them to keep growing. 284 00:18:58,990 --> 00:19:01,991 That's why they stagnate in protein levels. 285 00:19:02,740 --> 00:19:04,906 But when they have a lot of food, 286 00:19:05,120 --> 00:19:08,142 they have many different protein levels. 287 00:19:08,960 --> 00:19:11,653 They have many protein levels, 288 00:19:11,990 --> 00:19:15,368 because there is a stage 1 with a certain length, 289 00:19:15,510 --> 00:19:17,715 so they have certain protein level. 290 00:19:17,893 --> 00:19:21,730 A stage 2 with a certain length has a certain protein level, 291 00:19:21,911 --> 00:19:26,871 and so on, always in crescendo, going up and up. 292 00:19:28,730 --> 00:19:31,413 But the individuals were...? 293 00:19:32,140 --> 00:19:36,044 Were they all grown at the same time, at the same moment? 294 00:19:36,231 --> 00:19:38,800 The experiments started on the same day. 295 00:19:39,000 --> 00:19:41,484 Is this graph of all of them 296 00:19:42,240 --> 00:19:46,248 in the same conditions, the same days? 297 00:19:47,780 --> 00:19:51,208 In this graph, we see the different treatments. 298 00:19:51,546 --> 00:19:54,844 Here, in these saturation ones, we are putting in… 299 00:19:55,093 --> 00:20:01,057 In the starvation ones, we're putting in 0 to 11 µg of carbon. 300 00:20:02,746 --> 00:20:08,622 In the intermediate levels from 55 to 200 µg of carbon. 301 00:20:08,915 --> 00:20:11,770 In the higher ones, we have the successive. 302 00:20:11,928 --> 00:20:13,084 Yes, that's right. 303 00:20:13,253 --> 00:20:15,102 I don't know what you mean. 304 00:20:15,280 --> 00:20:19,591 My question is whether the organisms you measure, 305 00:20:19,760 --> 00:20:21,644 the enzyme activity, etc., 306 00:20:22,186 --> 00:20:25,840 whether they all were in the same time period. 307 00:20:26,017 --> 00:20:30,266 Yes, all the experiments were done in the same time period. 308 00:20:30,580 --> 00:20:34,284 Both the ones that have low protein, 309 00:20:35,230 --> 00:20:38,311 low body mass level, 310 00:20:38,613 --> 00:20:40,862 with respect to the others not.... 311 00:20:41,080 --> 00:20:44,417 I mean, are they grown under the same conditions? 312 00:20:45,050 --> 00:20:49,208 They are cultured in the same conditions, but you mean... 313 00:20:49,370 --> 00:20:52,204 All the experiments started on day 0. 314 00:20:52,533 --> 00:20:54,880 They are placed in different tanks. 315 00:20:55,102 --> 00:20:59,620 So, first tank, 0 cells, has no food. 316 00:20:59,990 --> 00:21:04,142 The last tank has the maximum: 880 µg of carbon per litre. 317 00:21:04,648 --> 00:21:06,951 4000 cells to give you an idea. 318 00:21:07,490 --> 00:21:11,244 They started on day 0. Every 24h samples were collected 319 00:21:11,410 --> 00:21:14,177 and taken from each experiment. 320 00:21:15,190 --> 00:21:19,760 If we consider that, individually, each one is a different experiment. 321 00:21:20,400 --> 00:21:23,600 We took samples from each one. Three replicates. 322 00:21:24,200 --> 00:21:29,244 And during the time, 6 to 10 days, 323 00:21:30,142 --> 00:21:32,426 we saw the daily growth. 324 00:21:32,870 --> 00:21:34,711 Okay, so this graph 325 00:21:34,924 --> 00:21:37,810 is from 6 to 10 days? 326 00:21:38,115 --> 00:21:39,890 From 0 to 10 days. 327 00:21:40,310 --> 00:21:41,608 Ah, okay. 328 00:21:42,124 --> 00:21:43,430 Up to the maximum. 329 00:21:43,760 --> 00:21:45,582 Maybe it would finish sooner, 330 00:21:45,710 --> 00:21:48,275 because they reach the maximum growth. 331 00:21:48,580 --> 00:21:50,888 The copepodites didn't interest us. 332 00:21:51,350 --> 00:21:55,262 And, for example, the three dots there, 333 00:21:55,431 --> 00:21:57,617 at the saturation level, 334 00:21:57,920 --> 00:22:00,720 with the lowest level of body mass. 335 00:22:00,977 --> 00:22:03,004 Those would correspond to the... 336 00:22:03,630 --> 00:22:05,404 Let's see, where are we? 337 00:22:06,604 --> 00:22:07,786 No. 338 00:22:07,920 --> 00:22:09,857 With respect to the others... 339 00:22:09,990 --> 00:22:14,275 But what I have here is an average of all my values. 340 00:22:14,711 --> 00:22:18,177 I have my average with its certain deviations and all. 341 00:22:18,364 --> 00:22:20,186 It's a 10-day average. 342 00:22:20,977 --> 00:22:23,048 It's never a time variation. 343 00:22:23,690 --> 00:22:28,808 You can see the enzyme; you can see it over time, 344 00:22:30,826 --> 00:22:34,888 how it increases, and the relationship as we have seen before. 345 00:22:35,244 --> 00:22:36,888 Here is the relationship. 346 00:22:37,030 --> 00:22:40,693 The relationship just for this, that's why it's separate, 347 00:22:40,830 --> 00:22:42,995 because we saw when we plotted... 348 00:22:43,706 --> 00:22:48,435 Here are the 0 and 11 µg of carbon per litre experiments. 349 00:22:48,800 --> 00:22:53,653 Here, the intermediates from 55 to 111, 350 00:22:53,930 --> 00:22:58,604 and here, 220, 440, and 880 µg of carbon per litre. 351 00:22:59,040 --> 00:23:06,826 So, we see that relationship. There are 3 different relationships, 352 00:23:07,170 --> 00:23:09,493 and it's a little bit due to... 353 00:23:09,715 --> 00:23:15,706 Also looking at the individuals that we fixed in Lugol, 354 00:23:16,070 --> 00:23:20,008 we can see the stage of each one, and distinguish the stages. 355 00:23:20,355 --> 00:23:22,995 Do you know what I mean? No. 356 00:23:25,626 --> 00:23:33,004 To propose that these individuals didn't reach stage 4, 5 or 6, 357 00:23:33,475 --> 00:23:37,226 we also relied on our images fixed in Lugol, 358 00:23:37,813 --> 00:23:40,248 where we got the length. 359 00:23:41,000 --> 00:23:45,440 There we saw that these individuals were not growing, 360 00:23:45,626 --> 00:23:49,164 but they were in the same stage, 361 00:23:50,000 --> 00:23:53,973 and they were even thinner than the ones that were feeding. 362 00:23:54,373 --> 00:23:58,364 The others were like this, and these were very skinny, 363 00:23:58,551 --> 00:24:02,690 and there was no growth. 364 00:24:03,000 --> 00:24:05,564 They were trying to survive. 365 00:24:06,370 --> 00:24:10,115 I liken it to going on a heavy diet: 366 00:24:10,293 --> 00:24:12,497 you don't really eat anything, 367 00:24:12,620 --> 00:24:15,315 you feed on yourself, and you waste away. 368 00:24:16,120 --> 00:24:20,302 I've already messed up and don't know what I was going to answer. 369 00:24:23,850 --> 00:24:25,306 Do you see it or not? 370 00:24:25,653 --> 00:24:27,262 Yes? Okay. 371 00:24:29,120 --> 00:24:30,960 More or less. 372 00:24:32,995 --> 00:24:34,097 Good. 373 00:24:36,120 --> 00:24:37,857 Just a suggestion. 374 00:24:38,888 --> 00:24:43,662 It would be interesting to look at reproduction as well, because... 375 00:24:44,080 --> 00:24:47,484 That's another part. Looking at egg growth? 376 00:24:47,680 --> 00:24:50,800 No, I mean this enzyme... 377 00:24:51,164 --> 00:24:53,000 It's just that we do... 378 00:24:53,410 --> 00:24:56,524 I'm interrupting you, but we do it with nauplii, 379 00:24:56,930 --> 00:24:59,262 because we're interested in... 380 00:24:59,431 --> 00:25:02,506 It doesn't reach other phases... Then, nothing. 381 00:25:03,511 --> 00:25:07,484 It's just that protein is produced not only for growth, 382 00:25:07,671 --> 00:25:10,160 but it is invested in reproduction, 383 00:25:10,300 --> 00:25:13,262 and I thought there was a variable missing. 384 00:25:14,080 --> 00:25:17,137 No, it's the early stages, the tedious ones. 385 00:25:17,893 --> 00:25:20,471 How did you remove the...? 386 00:25:21,850 --> 00:25:25,831 The Oxyrrhis must mark something. How did you remove that...? 387 00:25:26,170 --> 00:25:28,195 We filtered the water. 388 00:25:28,408 --> 00:25:30,220 -Filtering the water? -Yes. 389 00:25:32,210 --> 00:25:34,800 I've always had that doubt. 390 00:25:36,030 --> 00:25:38,204 What is in the digestive tract, 391 00:25:39,111 --> 00:25:41,300 I'm sure it does something, but... 392 00:25:41,528 --> 00:25:46,568 What can it influence? If it marks proteins and activity. 393 00:25:47,180 --> 00:25:51,120 But that would be like the ETS. We don't really consider that. 394 00:25:53,200 --> 00:25:56,684 No, but it's something we have to put up with. 395 00:25:58,017 --> 00:26:00,000 Maybe we should look at it. 396 00:26:00,328 --> 00:26:05,591 We leave it 24h before measuring to make sure they have everything. 397 00:26:07,244 --> 00:26:08,990 They are already starving. 398 00:26:09,226 --> 00:26:13,490 Then you are actually affecting their metabolism 399 00:26:13,688 --> 00:26:15,900 if you leave them 24h to defecate. 400 00:26:16,130 --> 00:26:19,395 24 or less to eliminate the interactive ones. 401 00:26:19,617 --> 00:26:23,390 We were catching every 24h, before we put the food in. 402 00:26:23,564 --> 00:26:28,853 So, they hardly had any food in the bowl anymore. 403 00:26:29,230 --> 00:26:32,871 We would have to look at defecation rates, etc. 404 00:26:33,200 --> 00:26:36,124 to know if they have a full stomach or not. 405 00:26:36,850 --> 00:26:39,102 But we did not look at that. 406 00:26:39,306 --> 00:26:42,570 I've never know how to deal with that. 407 00:26:42,737 --> 00:26:44,500 I don't know if it affects. 408 00:26:44,826 --> 00:26:46,980 That would be for future studies. 409 00:26:51,680 --> 00:26:56,088 The food concentration is expressed in µg of carbon per litre. 410 00:26:56,300 --> 00:26:59,608 What kind of compound does that µg refer to? 411 00:27:00,240 --> 00:27:03,377 It is a given ratio. I know the cells I put in. 412 00:27:03,520 --> 00:27:06,400 It's already calculated in literature 413 00:27:06,660 --> 00:27:11,768 the amount that equals certain amount of cells to carbon. 414 00:27:11,937 --> 00:27:14,782 -Do you add different plants? -Yes 415 00:27:14,933 --> 00:27:16,248 Any specific one? 416 00:27:16,426 --> 00:27:17,991 This is Oxyrrhis marina. 417 00:27:21,770 --> 00:27:22,995 Well... 418 00:27:26,622 --> 00:27:29,866 Shall we move on to the video or is there no time? 419 00:27:30,035 --> 00:27:31,182 There is time. 420 00:27:31,333 --> 00:27:33,060 Thanks for the questions. 421 00:27:36,106 --> 00:27:39,511 Now... Well, half of you have already seen it, right? 422 00:27:43,786 --> 00:27:46,995 Well, Avelina will play a video. 423 00:27:47,715 --> 00:27:50,391 Like many or some of you, 424 00:27:50,520 --> 00:27:53,351 I have the grant of the Canarian Government, 425 00:27:53,528 --> 00:27:57,920 which called me last year to talk 426 00:27:59,297 --> 00:28:01,960 about my goal applying for the grant, 427 00:28:02,284 --> 00:28:07,671 and I was in a video that they put on TV in advertising 428 00:28:11,013 --> 00:28:12,888 to encourage people, 429 00:28:13,010 --> 00:28:16,720 because it explains the base of the research grants. 430 00:28:17,315 --> 00:28:19,710 Especially the Canarian Government's. 431 00:28:33,111 --> 00:28:35,090 Training of research personnel. 432 00:28:35,422 --> 00:28:39,290 Promoting scientific research, technological development, 433 00:28:39,440 --> 00:28:42,290 and innovation in all the areas of knowledge 434 00:28:42,551 --> 00:28:48,213 is the main objective of the ACIISI 435 00:28:48,337 --> 00:28:50,106 of the Canarian Government. 436 00:28:50,730 --> 00:28:53,280 Based on this, it develops initiatives, 437 00:28:53,431 --> 00:28:57,182 aimed at promoting a business sector 438 00:28:57,342 --> 00:29:00,360 for the Canary Islands, based on knowledge. 439 00:29:01,102 --> 00:29:05,671 One of the programs developed since the beginning of the ACIISI, 440 00:29:05,831 --> 00:29:08,133 which had a new edition in 2010, 441 00:29:08,600 --> 00:29:11,457 is the training of research personnel. 442 00:29:11,626 --> 00:29:14,840 It consists of attracting better professionals 443 00:29:15,022 --> 00:29:17,280 to train them at the highest level. 444 00:29:17,937 --> 00:29:21,720 It's very important, because it responds to a priority line 445 00:29:21,920 --> 00:29:25,360 of the ACIISI 446 00:29:26,106 --> 00:29:28,750 to train new researchers. 447 00:29:28,924 --> 00:29:32,302 Young people who will be the future for an economy 448 00:29:32,435 --> 00:29:34,231 based on knowledge. 449 00:29:34,488 --> 00:29:37,260 To achieving these objectives, 450 00:29:37,484 --> 00:29:39,777 a funding was developed 451 00:29:39,920 --> 00:29:41,777 to promote training 452 00:29:41,910 --> 00:29:44,595 in scientific and technical research, 453 00:29:44,940 --> 00:29:48,808 with grants for PhD theses in the Canary Islands, 454 00:29:48,933 --> 00:29:52,862 and for stays in national, and international centres, 455 00:29:53,031 --> 00:29:56,400 that favour exchange, and the Canarian presence 456 00:29:56,533 --> 00:29:58,770 in other research centres. 457 00:29:59,310 --> 00:30:03,315 This is a priority issue for the Canary Islands Government, 458 00:30:03,520 --> 00:30:07,270 and many researchers, or scholarship holders in principle, 459 00:30:07,420 --> 00:30:10,284 have two years of grant and two of contract, 460 00:30:10,497 --> 00:30:15,644 and can be incorporated into projects financed by the Canary Islands. 461 00:30:16,040 --> 00:30:21,902 The scholarships are 85% co-financed by the European Social Fund, 462 00:30:22,290 --> 00:30:25,582 and their budget exceeds 2 million euros, 463 00:30:25,730 --> 00:30:29,493 destined to graduates in different areas of knowledge. 464 00:30:30,240 --> 00:30:33,804 These grants are structured in two periods. 465 00:30:33,920 --> 00:30:38,213 The first one as grant, and the second as internship contract, 466 00:30:38,364 --> 00:30:41,466 according to the Estatuto Personal Investigador 467 00:30:41,635 --> 00:30:45,490 en Formación, Real Decreto 63/2006. 468 00:30:45,850 --> 00:30:48,444 I wanted to continue my research career, 469 00:30:49,031 --> 00:30:54,180 and I looked for calls to continue with a predoctoral fellowship. 470 00:30:54,622 --> 00:30:57,870 I found the grant from the Canarian Government. 471 00:30:58,088 --> 00:31:02,053 I could continue my research career, and to do my thesis. 472 00:31:02,613 --> 00:31:06,220 By increasing the quantity and quality of PhD graduates, 473 00:31:06,426 --> 00:31:12,675 and by focusing efforts to train candidates at the highest level, 474 00:31:13,262 --> 00:31:18,071 we activate the means to create and consolidate high-profile firms. 475 00:31:23,680 --> 00:31:26,568 Very good. Thank you very much, Inma. 476 00:31:27,022 --> 00:31:32,213 We are scheduled for next Tuesday. We'll have Mar Benavides with us. 477 00:31:33,697 --> 00:31:34,800 Okay? 478 00:31:35,022 --> 00:31:40,390 Please, encourage your colleagues to attend these interesting talks. 479 00:31:42,115 --> 00:31:44,160 Thank you, Avelina.