Variations in egg characteristics of ruffe Gymnocephalus cernua inhabiting brackish and freshwater environments

Svirgsden, Roland; Albert, Anu; Rohtla, Mehis; Taal, Imre; Saks, Lauri; Verliin, Aare; Kesler, Martin; Hubel, Kalvi; Vetemaa, Markus; Saat, Toomas

doi:10.1007/s10152-015-0436-5

Helgoland Marine Research

Table 3 Correlations between different egg and fish characteristics

From: Variations in egg characteristics of ruffe Gymnocephalus cernua inhabiting brackish and freshwater environments

Correlation	Population	Correlation coefficient	N	P
TL × mean egg diameter	Pärnu	0.457	42	0.002
	Saadjärv I	0.670	21	<0.001
	Saadjärv II	−0.113	22	ns
	Peipsi	0.093^a	31	ns
TL × mean egg wet weight	Pärnu	0.576	42	<0.001
	Saadjärv I	0.536	21	0.012
	Saadjärv II	0.355	22	ns
	Peipsi	0.187^a	31	ns
TL × mean egg dry weight	Pärnu	0.546	42	<0.001
	Saadjärv I	0.538	21	0.012
	Saadjärv II	0.279	22	ns
	Peipsi	0.001^a	31	ns
TL × egg mass energy content	Pärnu	−0.354	16	ns
	Saadjärv I	0.873	8	0.005
	Saadjärv II	0.375	7	ns
	Peipsi	−0.310^a	8	ns
TL × egg energy content	Pärnu	0.558	16	0.025
	Saadjärv I	0.763	8	0.028
	Saadjärv II	0.170	7	ns
	Peipsi	0.405^a	8	ns
TL × fish condition	Pärnu	0.065	42	ns
	Saadjärv I	−0.030	21	ns
	Saadjärv II	0.001	22	ns
	Peipsi	−0.451^a	31	0.011
TL × age	Pärnu	0.634^a	42	<0.001
	Saadjärv I	0.751^a	21	<0.001
	Saadjärv II	0.618^a	22	0.002
	Peipsi	0.625^a	31	<0.001
	Combined	0.747^a	116	<0.001
Age × mean egg diameter	Pärnu	0.368^a	42	0.016
	Saadjärv I	0.701^a	21	<0.001
	Saadjärv II	0.138^a	22	ns
	Peipsi	−0.019^a	31	ns
Age × mean egg wet weight	Pärnu	0.541^a	42	<0.001
	Saadjärv I	0.533^a	21	0.013
	Saadjärv II	0.412^a	22	ns
	Peipsi	0.284^a	31	ns
Age × mean egg dry weight	Pärnu	0.525^a	42	<0.001
	Saadjärv I	0.592^a	21	<0.001
	Saadjärv II	0.341^a	22	ns
	Peipsi	0.004^a	31	ns
Age × egg mass energy content	Pärnu	−0.493^a	16	ns
	Saadjärv I	0.674^a	8	ns
	Saadjärv II	0.060^a	7	ns
	Peipsi	−0.436^a	8	ns
Age × egg energy content	Pärnu	0.451^a	16	ns
	Saadjärv I	0.784^a	8	0.021
	Saadjärv II	0.139^a	7	ns
	Peipsi	0.156^a	8	ns
Age × fish condition	Pärnu	0.323^a	42	0.037
	Saadjärv I	−0.028^a	21	ns
	Saadjärv II	0.104^a	22	ns
	Peipsi	−0.086^a	31	ns
Egg wet weight × diameter	Pärnu	0.822	42	<0.001
	Saadjärv I	0.764	21	<0.001
	Saadjärv II	0.566	22	0.006
	Peipsi	0.782	31	<0.001
	Combined	0.969	116	<0.001
Egg wet weight × dry matter %	Pärnu	0.169	42	ns
	Saadjärv I	−0.456	21	0.038
	Saadjärv II	−0.228	22	ns
	Peipsi	−0.505	31	0.004
Egg dry weight × diameter	Pärnu	0.827	42	<0.001
	Saadjärv I	0.858	21	<0.001
	Saadjärv II	0.508	22	0.016
	Peipsi	0.848	31	<0.001
	Combined	0.979	116	<0.001
Egg dry weight × dry matter %	Pärnu	0.425	42	0.005
	Saadjärv I	−0.153	21	ns
	Saadjärv II	0.371	22	ns
	Peipsi	0.025	31	ns
Fish condition × egg dry weight	Pärnu	0.324	42	0.036
	Saadjärv I	−0.195	21	ns
	Saadjärv II	−0.161	22	ns
	Peipsi	0.071	31	ns
Fish condition × egg mass energy content	Pärnu	−0.387	16	ns
	Saadjärv I	0.372	8	ns
	Saadjärv II	0.390	7	ns
	Peipsi	0.028	8	ns
Sibling size variation × egg diameter	Pärnu	0.187	42	ns
	Saadjärv I	0.118	21	ns
	Saadjärv II	−0.122	22	ns
	Peipsi	−0.032	31	ns

ns not significant
^aSpearman’s rank correlation coefficient (otherwise Pearson’s correlation coefficient)

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